氏名

ナラ ヒロキ

奈良 洋希

職名

主任研究員(研究院准教授)

所属

(ナノ・ライフ創新研究機構)

連絡先

メールアドレス

メールアドレス
h-nara@aoni.waseda.jp

住所・電話番号・fax番号

住所
〒169-8555新宿区 大久保3-4-1
電話番号
03-5286-3202
fax番号
03-3205-2074

URL等

研究者番号
20468870

本属以外の学内所属

学内研究所等

次世代蓄電エネルギー連携研究所

研究所員 2011年-2014年

次世代蓄電エネルギー連携研究所

研究所員 2015年-

学歴・学位

学歴

-2003年 早稲田大学 理工学部 応用化学
-2005年 早稲田大学 理工学研究科 応用化学
-2008年 早稲田大学 理工学研究科 応用化学

学位

博士(工学) 課程 早稲田大学 デバイス関連化学

所属学協会

電気化学会

日本化学会

研究分野

キーワード

応用電気化学

科研費分類

化学 / 材料化学 / デバイス関連化学

研究テーマ履歴

相分離電解質を用いたリチウム二次電池材料の開発

研究テーマのキーワード:ゲル電解質,負極,リチウム二次電池,相分離

個人研究

論文

Nanoindentation and nanowear study of Sn and Ni-Sn coatings

J. Chen, S. J. Bull, S. Roy, A. Kappor, H. Mukaibo, H. Nara, T. Momma, T. Osaka, Y. Shacham-Diamand

Tribol. Int.42(6)p.779 - 7912009年-

DOI

Mechanical Analysis and In-situ Structural and Morphological Evaluation of Ni-Sn Alloy Anodes for Li Ion Batteries

J. Chen, S. J. Bull, S. Roy, H. Mukaibo, H. Nara, T. Momma, T. Osaka, Y. Shacham-Diamand

J. Phys. D: Appl. Phys41(2)p.0253022008年-

DOI

Cycle and Rate Property of Mesoporous Tin Anode for Lithium Ion Secondary Batteries

H. Nara, Y. Fukuhara, H. Mukaibo, Y. Yamauchi, T. Momma, K. Kuroda, T. Osaka

Chem. Lett.37(2)p.142 - 1432008年-

DOI

Feasibility of an Interpenetrated Polymer Network System Made of Diblock Copolymer Composed of Polyethylene oxide and Polystyrene as the Gel Electrolyte for Lithium Secondary Batteries

H. Nara, T. Momma, T. Osaka

Electrochemistry76(4)p.276 - 2812008年-

Numerical Simulation of DMFC-Capacitor Hybrid Power Supply System for Small Electric Devices

T. Momma, H. Nara, T. Osaka

Electrochemistry76(4)p.270 - 2752008年-

Effect of the atmosphere on chemical composition and electrochemical properties of solid electrolyte interface on electrodeposited Li metal

Momma, Toshiyuki;Nara, Hiroki;Yamagami, Shinpei;Tatsumi, Chika;Osaka, Tetsuya

JOURNAL OF POWER SOURCES196(15)p.6483 - 64872011年-2011年

DOIWoS

詳細

ISSN:0378-7753

Impedance Analysis Counting Reaction Distribution on Degradation of Cathode Catalyst Layer in PEFCs

Nara, Hiroki;Tominaka, Satoshi;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY158(9)p.B1184 - B11912011年-2011年

DOIWoS

詳細

ISSN:0013-4651

Electrodeposited novel highly durable SiOC composite anode for Li battery above several thousands of cycles

Momma, Toshiyuki;Aoki, Seiichi;Nara, Hiroki;Yokoshima, Tokihiko;Osaka, Tetsuya

ELECTROCHEMISTRY COMMUNICATIONS13(9)p.969 - 9722011年-2011年

DOIWoS

詳細

ISSN:1388-2481

Proposal of novel equivalent circuit for electrochemical impedance analysis of commercially available lithium ion battery

Osaka, Tetsuya;Momma, Toshiyuki;Mukoyama, Daikichi;Nara, Hiroki

JOURNAL OF POWER SOURCES205p.483 - 4862012年-2012年

DOIWoS

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ISSN:0378-7753

Highly durable SiOC composite anode prepared by electrodeposition for lithium secondary batteries

Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

ENERGY & ENVIRONMENTAL SCIENCE5(4)p.6500 - 65052012年-2012年

DOIWoS

詳細

ISSN:1754-5692

Electrochemical Impedance Analysis on Degradation of Commercially Available Lithium Ion Battery during Charge-Discharge Cycling

Mukoyama, Daikichi;Momma, Toshiyuki;Nara, Hiroki;Osaka, Tetsuya

CHEMISTRY LETTERS41(4)p.444 - 4462012年-2012年

DOIWoS

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ISSN:0366-7022

Electrochemical impedance spectroscopy analysis for lithium-ion battery using Li4Ti5O12 anode

Hang, Tao;Mukoyama, Daikichi;Nara, Hiroki;Takami, Norio;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES222p.442 - 4472013年-2013年

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ISSN:0378-7753

Silicon composite thick film electrodeposited on a nickel micro-nanocones hierarchical structured current collector for lithium batteries

Hang, Tao;Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES222p.503 - 5092013年-2013年

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ISSN:0378-7753

Sn-O-C composite anode for Li secondary battery synthesized by an electrodeposition technique using organic carbonate electrolyte

Momma, Toshiyuki;Jeong, Moongook;Yokoshima, Tokihiko;Nara, Hiroki;Toyoda, Ayano;Osaka, Tetsuya

JOURNAL OF POWER SOURCES242p.527 - 5322013年-2013年

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ISSN:0378-7753

New Si-O-C composite film anode materials for LIB by electrodeposition

Osaka, Tetsuya;Nara, Hiroki;Momma, Toshiyuki;Yokoshima, Tokihiko

JOURNAL OF MATERIALS CHEMISTRY A2(4)p.883 - 8962014年-2014年

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詳細

ISSN:2050-7488

Structural analysis of highly durable Si-O-C composite anode prepared by electrodeposition for lithium secondary batteries (vol 107, pg 1, 2013)

Nara, Hiroki;Yokoshima, Tokihiko;Otaki, Mitsutoshi;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA110p.402 - 4022013年-2013年

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ISSN:0013-4686

Impedance analysis of the effect of flooding in the cathode catalyst layer of the polymer electrolyte fuel cell

Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA113p.720 - 7292013年-2013年

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ISSN:0013-4686

Electrochemical impedance analysis of electrodeposited Si-O-C composite thick film on Cu microcones-arrayed current collector for lithium ion battery anode

Hang, Tao;Mukoyama, Daikichi;Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Li, Ming;Osaka, Tetsuya

JOURNAL OF POWER SOURCES256p.226 - 2322014年-2014年

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ISSN:0378-7753

Carbon-coated Li2S Synthesized by Poly(vinylpyrrolidone) and Acetylene Black for Lithium Ion Battery Cathodes

Liu, Jun;Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

CHEMISTRY LETTERS43(6)p.901 - 9032014年-2014年

DOIWoS

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ISSN:0366-7022

Distinction of impedance responses of Li-ion batteries for individual electrodes using symmetric cells

Momma, Toshiyuki;Yokoshima, Tokihiko;Nara, Hiroki;Gima, Yuhei;Osaka, Tetsuya

ELECTROCHIMICA ACTA131p.195 - 2012014年-2014年

DOIWoS

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ISSN:0013-4686

Influence of the diffusion-layer thickness during electrodeposition on the synthesis of nano core/shell Sn-O-C composite as an anode of lithium secondary batteries

Jeong, Moongook;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

RSC ADVANCES4(51)p.26872 - 268802014年-2014年

DOIWoS

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ISSN:2046-2069

Analysis of an Electrodeposition Mechanism of Sn-O-C Composite from an Organic Electrolyte

Jeong, Moongook;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY161(7)p.D3025 - D30312014年-2014年

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ISSN:0013-4651

A Lithium-Ion Sulfur Battery Based on a Carbon-Coated Lithium-Sulfide Cathode and an Electrodeposited Silicon-Based Anode

Agostini, Marco;Hassoun, Jusef;Liu, Jun;Jeong, Moongook;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya;Sun, Yang-Kook;Scrosati, Bruno

ACS APPLIED MATERIALS & INTERFACES6(14)p.10924 - 109282014年-2014年

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ISSN:1944-8244

New Analysis of Electrochemical Impedance Spectroscopy for Lithium-ion Batteries

Osaka, Tetsuya;Nara, Hiroki;Mukoyama, Daikichi;Yokoshima, Tokihiko

JOURNAL OF ELECTROCHEMICAL SCIENCE AND TECHNOLOGY4(4)p.157 - 1622013年-2013年

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詳細

ISSN:2093-8551

Zinc-Air Battery: Understanding the Structure and Morphology Changes of Graphene-Supported CoMn2O4 Bifunctional Catalysts Under Practical Rechargeable Conditions

Prabu, Moni;Ramakrishnan, Prakash;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya;Shanmugam, Sangaraju

ACS APPLIED MATERIALS & INTERFACES6(19)p.16545 - 165552014年-2014年

DOIWoS

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ISSN:1944-8244

Electrodeposited three-dimensional porous Si-O-C/Ni thick film as high performance anode for lithium-ion batteries

Qian, Xin;Hang, Tao;Nara, Hiroki;Yokoshima, Tokihiko;Li, Ming;Osaka, Tetsuya

JOURNAL OF POWER SOURCES272p.794 - 7992014年-2014年

DOIWoS

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ISSN:0378-7753

Li2S cathode modified with polyvinylpyrrolidone and mechanical milling with carbon

Liu, Jun;Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES273p.1136 - 11412015年-2015年

DOIWoS

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ISSN:0378-7753

Suppression of polysulfide dissolution by polypyrrole modification of sulfur-based cathodes in lithium secondary batteries

Nakamura, Natsuki;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES274p.1263 - 12662015年-2015年

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ISSN:0378-7753

Effect of electrolyte on cycle performances of the electrodeposited Sn-O-C composite anode of lithium secondary batteries

Jeong, Moongook;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES275p.525 - 5302015年-2015年

DOIWoS

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ISSN:0378-7753

Li-Rich Li-Si Alloy As A Lithium-Containing Negative Electrode Material Towards High Energy Lithium-Ion Batteries

Iwamura, Shinichiroh;Nishihara, Hirotomo;Ono, Yoshitaka;Morito, Haruhiko;Yamane, Hisanori;Nara, Hiroki;Osaka, Tetsuya;Kyotani, Takashi

SCIENTIFIC REPORTS52015年-2015年

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ISSN:2045-2322

Application of Electrochemical Impedance Spectroscopy to Ferri/Ferrocyanide Redox Couple and Lithium Ion Battery Systems Using a Square Wave as Signal Input

Yokoshima, Tokihiko;Mukoyama, Daikichi;Nakazawa, Kazuhiro;Gima, Yuhei;Isawa, Hidehiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA180p.922 - 9282015年-2015年

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ISSN:0013-4686

Li-rich Li-Si alloy as a lithium-containing negative electrode material towards high energy lithium-ion batteries.

Iwamura Shinichiroh;Nishihara Hirotomo;Ono Yoshitaka;Morito Haruhiko;Yamane Hisanori;Nara Hiroki;Osaka Tetsuya;Kyotani Takashi

Scientific reports52015年-2015年

PubMedDOI

詳細

ISSN:2045-2322

概要::Lithium-ion batteries (LIBs) are generally constructed by lithium-including positive electrode materials, such as LiCoO2, and lithium-free negative electrode materials, such as graphite. Recently, lithium-free positive electrode materials, such as sulfur, are gathering great attention from their very high capacities, thereby significantly increasing the energy density of LIBs. Though the lithium-free materials need to be combined with lithium-containing negative electrode materials, the latter has not been well developed yet. In this work, the feasibility of Li-rich Li-Si alloy is examined as a lithium-containing negative electrode material. Li-rich Li-Si alloy is prepared by the melt-solidification of Li and Si metals with the composition of Li21Si5. By repeating delithiation/lithiation cycles, Li-Si particles turn into porous structure, whereas the original particle size remains unchanged. Since Li-Si is free from severe constriction/expansion upon delithiation/lithiation, it shows much better cyclability than Si. The feasibility of the Li-Si alloy is further examined by constructing a full-cell together with a lithium-free positive electrode. Though Li-Si alloy is too active to be mixed with binder polymers, the coating with carbon-black powder by physical mixing is found to prevent the undesirable reactions of Li-Si alloy with binder polymers, and thus enables the construction of a more practical electrochemical cell.

Impedance analysis with transmission line model for reaction distribution in a pouch type lithium-ion battery by using micro reference electrode

Nara, Hiroki; Mukoyama, Daikichi; Yokoshima, Tokihiko; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Journal of the Electrochemical Society163(3)p.A434 - A4412016年01月-2016年01月 

DOIScopus

詳細

ISSN:00134651

概要:© The Author(s) 2015.Electrochemical impedance spectroscopy (EIS) using an equivalent circuit is a powerful tool in the diagnosis of lithium-ion batteries (LIBs). However, LIBs have been increasingly used in applications requiring power higher than that used for conventional LIBs for portable electric devices. Considering this demand for LIBs, the ionic resistances in the electrodes, which raise a reaction distribution under high-power operation, are important. This consequently means EIS analysis should include ionic resistances in the electrodes in equivalent circuits. Additionally, the impedance response of LIBs are too complicated to be analyzed in detail because the impedance response consists of overlapping elemental processes such as chemical reactions and ion migration. This paper therefore presents an analysis of impedance responses, which are independently obtained by a micro reference electrode, by using a transmission line model (TLM) that possesses the ability to count the ionic resistances in the electrodes. Similar to the conventional Randles equivalent circuit, the equivalent circuit with TLM could fit the impedance responses simulated by the equivalent circuit with measured responses. This paper discusses the potential of EIS using an equivalent circuit coupled with a TLM for diagnosis of LIBs in power applications.

One-Step Hydrothermal Synthesis of SnS2/SnO2/C Hierarchical Heterostructures for Li-ion Batteries Anode with Superior Rate Capabilities

Chen, Chun Yi; Chen, Chun Yi; Yokoshima, Tokihiko; Yokoshima, Tokihiko; Nara, Hiroki; Nara, Hiroki; Momma, Toshiyuki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya; Osaka, Tetsuya

Electrochimica Acta183p.78 - 842015年11月-2015年11月 

DOIScopus

詳細

ISSN:00134686

概要:© 2015 Elsevier Ltd. All rights reserved.Novel three-dimensional hierarchical heterostructures composed of two-dimensional SnS2 nanoflakes and zero-dimensional SnO2 nanoparticles were fabricated via a one-step hydrothermal method. Size of the heterostructures was ca. 2 μm in diameter, and individual SnS2 nanoflakes with thickness of ca. 150 nm were connected to central core of the heterostructures. The SnO2 nanoparticles in a diameter of ca. 5 nm uniformly covered entire surface of the SnS2 nanoflakes. Moreover, both of these structures were highly crystalline. Meanwhile, amorphous carbon was formed within the heterostructures. The SnS2/SnO2/C hierarchical heterostructures had a high initial specific reversible capacity of 1065.7 mAh g-1, stable cycling stability of 638 mAh g-1 after 30 cycles, and superior rate capability of 550.8 mAh g-1 at 1C rate. These SnS2/SnO2/C hierarchical heterostructures showed better performance than individual SnS2 and SnO2 nanomaterials, and the performance was even higher than the graphene-SnS2 and graphene-SnO2 nanohybrid materials. This is attributed to a synergistic effect of high surface area, which is provided by the unique SnS2 internal nanoflake layered structures decorated with ultra-fine SnO2 nanoparticles, and an effective beneficial buffer matrix to accommodate the large volume change upon cycling, which is caused by the side-products such as Li2S or Li2O. The SnS2 nanoflake was deduced to play a similar role as graphene material, since both possess 2D conducting layer structures. The uniform carbon dispersion within the structures also stabilizes the structures and improves electrical conductivity of the hierarchical heterostructures.

Micro-scale Li2S-C composite preparation from Li2SO4 for cathode of lithium ion battery

Liu, Jun; Nara, Hiroki; Yokoshima, Tokihiko; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Electrochimica Acta183p.70 - 772015年11月-2015年11月 

DOIScopus

詳細

ISSN:00134686

概要:© 2015 Elsevier Ltd. All rights reserved.A facile and scalable method is proposed to prepare microscale Li2S-C composite from Li2SO4 through carbon-thermal reduction, followed by a carbon coating process. Multi-solvent recrystallization was utilized to reduce the particle size of Li2SO4 to 2 μm. This fine-grain Li2SO4 helps to shorten the particle size of reduction product from 10 μm to 3 μm. Using fine Li2SO4 also brings the benefit of greatly reducing the over potential during the initial charge process and increasing the kinetics for Li2S materials. Finally, the microscale Li2S-C composite prepared from fine Li2SO4 enables a stable capacity of 350 mAh g-1 at 0.2 C, higher than that obtained using a cathode prepared from commercial Li2SO4.

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si-O-C composite

Jeong, Moongook;Ahn, Seongki;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

NANO ENERGY28p.51 - 622016年-2016年

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ISSN:2211-2855

Electrophoretically deposited carbon nanotube anchor layer to improve areal capacity of Si-O-C composite anode for lithium secondary batteries

Ahn, Seongki;Jeong, Moongook;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES336p.203 - 2112016年-2016年

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ISSN:0378-7753

A pre-lithiation method for sulfur cathode used for future lithium metal free full battery

Wu, Yunwen; Yokoshima, Tokihiko; Nara, Hiroki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Journal of Power Sources342p.537 - 5452017年02月-2017年02月 

DOIScopus

詳細

ISSN:03787753

概要:© 2016 Elsevier B.V.Lithium metal free sulfur battery paired by lithium sulfide (Li2S) is a hot point in recent years because of its potential for relatively high capacity and its safety advantage. Due to the insulating nature and high sensitivity to moisture of Li2S, it calls for new way to introduce Li ion into S cathode besides the method of directly using the Li2S powder for the battery pre-lithiation. Herein, we proposed a pre-lithiation method to lithiate the polypyrrole (PPy)/S/Ketjenblack (KB) electrode into PPy/Li2S/KB cathode at room temperature. By this process, the fully lithiated PPy/Li2S/KB cathode showed facilitated charge transfer than the original PPy/S/KB cathode, leading to better cycling performance at high C-rates and disappearance of over potential phenomenon. In this work, the ion-selective PPy layer has been introduced on the cathode surface by an electrodeposition method, which can suppress the polysulfide dissolution from the cathode source. The lithium metal free full battery coupled by the prepared Li2S/KB cathode and graphite anode exhibited excellent cycling performance. Hence, we believe this comprehensive fabrication approach of Li2S cathode will pave a way for the application of new type lithium metal free secondary battery.

The potential for the creation of a high areal capacity lithium-sulfur battery using a metal foam current collector

Nara, Hiroki; Yokoshima, Tokihiko; Mikuriya, Hitoshi; Tsuda, Shingo; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Journal of the Electrochemical Society164(1)p.A5026 - A50302017年01月-2017年01月 

DOIScopus

詳細

ISSN:00134651

概要:© The Author(s) 2016. Published by ECS.Ahigh areal capacity lithium-sulfur batterymaking use of mass produced aluminum metal foam as a current collectorwas investigated. A sulfur/Ketjenblack (KB) composite was filled and deposited into the aluminum foam current collector via a predetermined filling procedure, resulting in high sulfur loading. The value for this loading was found to be 17.7 mg sulfur/cm2 by using carboxymethyl cellulose and styrene butadiene rubber (CMC + SBR) as a binder. An operating single-layer pouch-Type cell with an S/KBCMC+ SBR on Al foam cathode was created as a result of this synthesis and found to possess an unprecedentedly high areal capacity of 21.9 mAh/cm2. On the basis of the achieved areal capacity, the energy density of a theoretical lithium-sulfur battery was estimated with the assumption of an electrolyte/sulfur ratio of 2.7 μL/mg. This was calculated upon 100% of the pore volume in the S/KB-CMC + SBR on Al foam cathodes and polyolefin separator, along with the inclusion of the weights of the tabs for the current lead and pouch film packaging in the case of a seven-layer pouch-Type battery. With this calculation, it was determined that the creation of a lithium-sulfur battery with an energy density of greater than 200 Wh/kg is plausible.

Impedance Analysis of LiNi1/3Mn1/3Co1/3O2 Cathodes with Different Secondary-particle Size Distribution in Lithium-ion Battery

Nara, Hiroki; Morita, Keisuke; Mukoyama, Daikichi; Yokoshima, Tokihiko; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Electrochimica Acta241p.323 - 3302017年07月-2017年07月 

DOIScopus

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ISSN:00134686

概要:© 2017 Elsevier Ltd Mid to low frequency impedance for a cathode in a lithium ion battery (LIB), which is affected by lithium-ion diffusion into active materials, was investigated. We had earlier suggested that charge-transfer and diffusion impedances are attributed to a particle size distribution for a commercially available LIB, and we designed an equivalent circuit in which two series circuits of charge-transfer resistance and Warburg impedance were connected in parallel. Here, to validate the design of the equivalent circuit, the secondary-particle size distribution of the LiNi 1/3 Mn 1/3 Co 1/3 O 2 cathode in a lab-made LIB, in which the secondary-particles were controlled into wide and narrow distribution by sieving, was investigated by electrochemical impedance spectroscopy. The equivalent circuit was designed in which series circuits of charge-transfer resistance and Warburg impedance were connected in parallel. Dependency of impedance response on the number of parallels of the series circuits was evaluated for the cathodes using different secondary-particle size distributions of the active material. Additionally, the tendency of change in the charge-transfer resistance and the limiting capacitance was discussed from the standpoint of secondary-particle size distribution. The results confirm the effectiveness of the designed equivalent circuit which reflects the secondary-particle size distribution of cathode active materials.

Carbonate-based additive for improvement of cycle durability of electrodeposited Si-O-C composite anode in glyme-based ionic liquid electrolyte for use in lithium secondary batteries

Seko, Shohei; Nara, Hiroki; Jeong, Moongook; Yokoshima, Tokihiko; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya

Electrochimica Acta243p.65 - 712017年07月-2017年07月 

DOIScopus

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ISSN:00134686

概要:© 2017 Elsevier Ltd The cycle durability of electrodeposited Si-O-C composite anodes in glyme-based ionic liquid electrolytes, known as Li(G3)TFSI or Li(G4)TFSI (triglyme: G3 and tetraglyme: G4), which is one of the most promising electrolytes for sulfur cathode, was improved for use in lithium secondary batteries by using additives, fluoroethylene carbonate (FEC) or vinylene carbonate (VC). We revealed an importance of the activation process and the effects of additives in the Si-O-C composite anode. The capacity of the Si-O-C composite anode decreased with charge-discharge cycles in electrolytes without additives. Meanwhile, although the capacity retention in electrolytes with additives was improved by 10–20%, their initial capacity was smaller than those without additives. To solve the contradiction, an activation process, in which the Si-O-C composite anode was charged and discharged in electrolytes without additives, was introduced before charge-discharge cycles in electrolytes with additives. Owing to the optimized activation process, the initial capacity in electrolytes with additives showed as high as 1100–1300 mAh g −1 as those without additives with better capacity retention. Therefore, the necessity to adequately generate an activation reaction and to form SEI derived from additives for the Si-O-C composite anode to have better charge-discharge performance was demonstrated.

Techniques for realizing practical application of sulfur cathodes in future Li-ion batteries

Nara, Hiroki; Tsuda, Shingo; Osaka, Tetsuya

Journal of Solid State Electrochemistry21(7)p.1925 - 19372017年07月-2017年07月 

DOIScopus

詳細

ISSN:14328488

概要:© 2017, Springer-Verlag Berlin Heidelberg. The development of lithium-sulfur batteries is associated with many problems. These problems include polysulfide dissolution, the shuttle phenomenon, the low electric and ionic conductivity of S, and the volume change that occurs during charge and discharge. In this review, various elemental techniques for overcoming these problems are summarized from the standpoints of the supporting materials. These techniques include preventing polysulfide dissolution from the cathodes through physical and chemical adsorption on the supporting materials, the use of electrolytes that do not dissolve polysulfides via the coordination of Li + and solvents, and the use of ion-exchange polymers to permeate Li + selectively. The following approaches to enable practical applications of S cathodes in future Li-ion batteries are introduced: the utilization of Li-free anode materials, such as C and Si; the use of Li 2 S cathodes, which are prepared via a pre-lithiation process; and increasing the areal capacity of the S cathode by using a suitable current collector such as Al foam, thus providing a large amount of space for Li + to migrate and the electron-conductive path. The utilization of an Al foam current collector is one of the promising approaches to creating a cost-effective Li-ion battery owing to the established mass production of Al foam for use in NiMH batteries; such Li-ion battery can achieve an unprecedentedly high areal capacity of 21.9 mAh cm −2 . Owing to the resulting areal capacity, the possibility of developing a lithium-sulfur battery with an energy density greater than 200 Wh kg −1 has been demonstrated. Consequently, the combination of these approaches, as introduced in this review, would help create a bright, sustainable society.

Impedance Measurements of Kilowatt-Class Lithium Ion Battery Modules/Cubicles in Energy Storage Systems by Square-Current Electrochemical Impedance Spectroscopy

Yokoshima, Tokihiko; Mukoyama, Daikichi; Nara, Hiroki; Maeda, Suguru; Nakazawa, Kazuhiro; Momma, Toshiyuki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Electrochimica Acta246p.800 - 8112017年08月-2017年08月 

DOIScopus

詳細

ISSN:00134686

概要:© 2017 Elsevier Ltd Electrochemical impedance measurements of lithium ion batteries (LIBs) in energy storage systems (ESS) were performed. Square-current electrochemical impedance spectroscopy (SC-EIS), which is a simple and cost-effective approach to measure impedance, was chosen to investigate a large-scale LIB system. Harmonics calculated by Fourier transform from a square waveform were used to determine the impedance. On the basis of a simple electrochemical reaction involving the ferri/ferro-cyanide redox couple and the LIB, the accuracy of the impedance measurement was found to depend on both the signal-to-noise ratio of the power spectra of the harmonics as well as the attenuation rate of the “measured value of impedance” and the “theoretical spectra value” from Fourier series. The accuracy was improved by adjusting the input waveform to be close to an ideal square waveform from Fourier series. The accuracy was further improved by the combined use of a simple moving average and an overall average. The impedance from a degraded square waveform generated by a cost-effective power controller was able to be deter mined by increasing the measurement time, which aided averaging. By designing the input signal to be close to an ideal square waveform from Fourier series, kilowatt-class LIB modules/cubicles in an ESS was able to be measured. Moreover, a degraded LIB module in an ESS was able to be detected using EIS, which highlights the utility of this technique for in situ impedance measurements of large-scale LIB systems.

On-site chemical pre-lithiation of S cathode at room temperature on a 3D nano-structured current collector

Wu, Yunwen; Momma, Toshiyuki; Momma, Toshiyuki; Ahn, Seongki; Yokoshima, Tokihiko; Nara, Hiroki; Osaka, Tetsuya; Osaka, Tetsuya

Journal of Power Sources366p.65 - 712017年10月-2017年10月 

DOIScopus

詳細

ISSN:03787753

概要:© 2017 The Authors This work reports a new chemical pre-lithiation method to fabricate lithium sulfide (Li 2 S) cathode. This pre-lithiation process is taken place simply by dropping the organolithium reagent lithium naphthalenide (Li + Naph − ) on the prepared sulfur cathode. It is the first time realizing the room temperature chemical pre-lithaition reaction attributed by the 3D nanostructured carbon nanotube (CNT) current collector. It is confirmed that the Li 2 S cathode fabricated at room temperature showing higher capacity and lower hysteresis than the Li 2 S cathode fabricated at high temperature pre-lithiation. The pre-lithiated Li 2 S cathode at room temperature shows stable cycling performance with a 600 mAh g −1 capacity after 100 cycles at 0.1 C-rate and high capacity of 500 mAh g −1 at 2 C-rate. This simple on-site pre-lithiation method at room temperature is demonstrated to be applicable for the in-situ pre-lithiation in a Li metal free battery.

Characteristics of interpenetrated polymer network system made of polyethylene oxide-LiBF4 complex and polystyrene as the electrolyte for lithium secondary battery

Momma, T;Ito, H;Nara, H;Mukaibo, H;Passerini, S;Osaka, T

ELECTROCHEMISTRY71(12)p.1182 - 11862003年-2003年

WoS

詳細

ISSN:1344-3542

Mechanical analysis and in situ structural and morphological evaluation of Ni-Sn alloy anodes for Li ion batteries

Chen, J.;Bull, S. J.;Roy, S.;Mukaibo, H.;Nara, H.;Momma, T.;Osaka, T.;Shacham-Diamand, Y.

JOURNAL OF PHYSICS D-APPLIED PHYSICS41(2)2008年-2008年

DOIWoS

詳細

ISSN:0022-3727

Cycle and rate properties of mesoporous tin anode for lithium ion secondary batteries

Nara, Hiroki;Fukuhara, Yoshiki;Takai, Azusa;Komatsu, Masaki;Mukaibo, Hitomi;Yamauchi, Yusuke;Momma, Toshiyuki;Kuroda, Kazuyuki;Osaka, Tetsuya

CHEMISTRY LETTERS37(2)p.142 - 1432008年-2008年

DOIWoS

詳細

ISSN:0366-7022

Numerical simulation of DMFC-capacitor hybrid power supply system for small electronic devices

Momma, Toshiyuki;Nara, Hiroki;Osaka, Tetsuya

ELECTROCHEMISTRY76(4)p.270 - 2752008年-2008年

WoS

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ISSN:1344-3542

Feasibility of an interpenetrated polymer network system made of di-block copolymer composed of polyethylene oxide and polystyrene as the gel electrolyte for lithium secondary batteries

Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHEMISTRY76(4)p.276 - 2812008年-2008年

WoS

詳細

ISSN:1344-3542

Liquid Chromatography-Quadruple Time of Flight Mass Spectrometry Analysis of Products in Degraded Lithium-Ion Batteries

Tochihara, Misako;Nara, Hiroki;Mukoyama, Daikichi;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY162(10)p.A2008 - A20152015年-2015年

DOIWoS

詳細

ISSN:0013-4651

Review-Development of Diagnostic Process for Commercially Available Batteries, Especially Lithium Ion Battery, by Electrochemical Impedance Spectroscopy

Osaka, Tetsuya;Mukoyama, Daikichi;Nara, Hiroki

JOURNAL OF THE ELECTROCHEMICAL SOCIETY162(14)p.A2529 - A25372015年-2015年

DOIWoS

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ISSN:0013-4651

Impedance Analysis with Transmission Line Model for Reaction Distribution in a Pouch Type Lithium-Ion Battery by Using Micro Reference Electrode

Nara, Hiroki;Mukoyama, Daikichi;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY163(3)p.A434 - A4412016年-2016年

DOIWoS

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ISSN:0013-4651

Film Properties of Electropolymerized Polypyrrole for a Sulfur/Ketjenblack Cathode in Lithium Secondary Batteries

Nakamura, Natsuki;Wu, Yunwen;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY163(5)p.A683 - A6892016年-2016年

DOIWoS

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ISSN:0013-4651

One-Step Hydrothermal Synthesis of SnS2/SnO2/C Hierarchical Heterostructures for Li-ion Batteries Anode with Superior Rate Capabilities

Chen, Chun-Yi;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA183p.78 - 842015年-2015年

DOIWoS

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ISSN:0013-4686

The Potential for the Creation of a High Areal Capacity Lithium-Sulfur Battery Using a Metal Foam Current Collector

Nara, Hiroki;Yokoshima, Tokihiko;Mikuriya, Hitoshi;Tsuda, Shingo;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY164(1)p.A5026 - A50302017年-2017年

DOIWoS

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ISSN:0013-4651

Development of Areal Capacity of Si-O-C Composites as Anode for Lithium Secondary Batteries Using 3D-Structured Carbon Paper as a Current Collector

Ahn, Seongki;Jeong, Moongook;Miyamoto, Koki;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF THE ELECTROCHEMICAL SOCIETY164(2)p.A355 - A3592017年-2017年

DOIWoS

詳細

ISSN:0013-4651

PEO-LiBF_4錯体およびポリスチレンからなる相互連続複合体電解質のリチウム二次電池電解質としての評価

門間 聰之;伊藤 弘顕;奈良 洋希;向坊 仁美;パッセリーニ ステファノ;逢坂 哲彌

電気化学および工業物理化学 : denki kagaku71(12)p.1182 - 11862003年12月-2003年12月 

CiNii

詳細

ISSN:13443542

56th Annual Meeting of the International Society of Electrochemistry (ISE)

浅野 直紀;奈良 洋希

電気化学および工業物理化学 : denki kagaku74(7)p.571 - 5722006年07月-2006年07月 

CiNii

詳細

ISSN:13443542

小型電子機器へ向けたDMFC-キャパシタハイブリッド電源の数値シミュレーション

門間 聰之;奈良 洋希;逢坂 哲彌

電気化学および工業物理化学 : denki kagaku76(4)p.270 - 2752008年04月-2008年04月 

CiNii

詳細

ISSN:13443542

PEO-PSジブロックコポリマーからなる相互連続複合電解質のリチウム二次電池用ゲル電解質としての評価

奈良 洋希;門間 聰之;逢坂 哲彌

電気化学および工業物理化学 : denki kagaku76(4)p.276 - 2812008年04月-2008年04月 

CiNii

詳細

ISSN:13443542

Cycle and Rate Properties of Mesoporous Tin Anode for Lithium Ion Secondary Batteries

NARA Hiroki;FUKUHARA Yoshiki;TAKAI Azusa;KOMATSU Masaki;MUKAIBO Hitomi;YAMAUCHI Yusuke;MOMMA Toshiyuki;KURODA Kazuyuki;OSAKA Tetsuya

Chemistry letters37(2)p.142 - 1432008年02月-2008年02月 

CiNii

詳細

ISSN:03667022

Numerical Simulation of DMFC-Capacitor Hybrid Power Supply System for Small Electronic Devices

MOMMA Toshiyuki;NARA Hiroki;OSAKA Tetsuya

Electrochemistry76(4)p.270 - 2752008年-2008年

CiNii

詳細

ISSN:1344-3542

概要:A simple numerical simulation of current flowing through electronic devices was examined for a hybrid power supply system composed of a DMFC and a capacitor connected in parallel. The simulation was investigated by representing a combination of ohmic resistance, charge transfer reaction resistance, mass transfer resistance and double layer capacitance of a DMFC as a simple ideal resistor, based on measured data when DMFC was generating electricity. The simulation result was found to agree with experimental measured current flowing through the DMFC and the capacitor, although a slight disagreement was observed because of the presence of ohmic resistance between circuit components. The simulation of DMFC-capacitor hybrid power supply system indicated the importance of the inner resistance of the capacitor. The hybrid simulation was also applied to a system assumed to consist of μDMFC and micro electrochemical capacitor (MECC) system. The effect of applying a DC-DC converter to the system was indicated. The simulation allows to predict the degree of improvement required without performing actual fabrication of μDMFC and MECC.

Nanoindentation and nanowear study of Sn and Ni-Sn coatings

Chen, J.;Bull, S. J.;Roy, S.;Kapoor, A.;Mukaibo, H.;Nara, H.;Momma, T.;Osaka, T.;Shacham-Diamand, Y.

TRIBOLOGY INTERNATIONAL42(6)p.779 - 7912009年-2009年

DOIWoS

詳細

ISSN:0301-679X

Structural analysis of highly-durable Si-O-C composite anode prepared by electrodeposition for lithium secondary batteries

Nara, Hiroki;Yokoshima, Tokihiko;Otaki, Mitsutoshi;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA110p.403 - 4102013年-2013年

DOIWoS

詳細

ISSN:0013-4686

Micro-scale Li2S-C composite preparation from Li2SO4 for cathode of lithium ion battery

Liu, Jun;Nara, Hiroki;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA183p.70 - 772015年-2015年

DOIWoS

詳細

ISSN:0013-4686

A pre-lithiation method for sulfur cathode used for future lithium metal free full battery

Wu, Yunwen;Yokoshima, Tokihiko;Nara, Hiroki;Momma, Toshiyuki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES342p.537 - 5452017年-2017年

DOIWoS

詳細

ISSN:0378-7753

Impedance Analysis of LiNi1/3Mn1/3Co1/3O2 Cathodes with Different Secondary-particle Size Distribution in Lithium-ion Battery

Nara, Hiroki;Morita, Keisuke;Mukoyama, Daikichi;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA241p.323 - 3302017年-2017年

DOIWoS

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ISSN:0013-4686

Carbonate-based additive for improvement of cycle durability of electrodeposited Si-O-C composite anode in glyme-based ionic liquid electrolyte for use in lithium secondary batteries

Seko, Shohei;Nara, Hiroki;Jeong, Moongook;Yokoshima, Tokihiko;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA243p.65 - 712017年-2017年

DOIWoS

詳細

ISSN:0013-4686

Techniques for realizing practical application of sulfur cathodes in future Li-ion batteries

Nara, Hiroki;Tsuda, Shingo;Osaka, Tetsuya

JOURNAL OF SOLID STATE ELECTROCHEMISTRY21(7)p.1925 - 19372017年-2017年

DOIWoS

詳細

ISSN:1432-8488

Impedance Measurements of Kilowatt-Class Lithium Ion Battery Modules/Cubicles in Energy Storage Systems by Square-Current Electrochemical Impedance Spectroscopy

Yokoshima, Tokihiko;Mukoyama, Daikichi;Nara, Hiroki;Maeda, Suguru;Nakazawa, Kazuhiro;Momma, Toshiyuki;Osaka, Tetsuya

ELECTROCHIMICA ACTA246p.800 - 8112017年-2017年

DOIWoS

詳細

ISSN:0013-4686

On-site chemical pre-lithiation of S cathode at room temperature on a 3D nano-structured current collector

Wu, Yunwen;Momma, Toshiyuki;Ahn, Seongki;Yokoshima, Tokihiko;Nara, Hiroki;Osaka, Tetsuya

JOURNAL OF POWER SOURCES366p.65 - 712017年-2017年

DOIWoS

詳細

ISSN:0378-7753

Electrochemical Impedance Analysis on Degradation of Commercially Available Lithium Ion Battery during Charge-Discharge Cycling

MUKOYAMA Daikichi;MOMMA Toshiyuki;NARA Hiroki;OSAKA Tetsuya

Chemistry letters41(4)p.444 - 4462012年04月-2012年04月 

CiNii

詳細

ISSN:03667022

Feasibility of an Interpenetrated Polymer Network System Made of Di-block Copolymer Composed of Polyethylene Oxide and Polystyrene as the Gel Electrolyte for Lithium Secondary Batteries

NARA Hiroki;MOMMA Toshiyuki;OSAKA Tetsuya

Electrochemistry76(4)p.276 - 2812008年-2008年

CiNii

詳細

ISSN:1344-3542

概要:The feasibility of a di-block copolymer, composed of a polyethylene oxide (PEO) chain and a polystyrene (PS) chain covalently bonded, as the gel electrolyte for lithium secondary batteries was investigated. The PEO-PS di-block copolymer gel electrolyte showed a high ionic conductivity of ∼1 mS/cm at room temperature. Moreover, it retained good mechanical strength within a co-continuous phase separated structure, and it suppressed the dendritic deposition of Li. Indications were that the interface between the electrolyte and the Li metal was chemically stable, as a result of the PEO phase fixed to PS by covalent bonding. In addition, it was indicated that the Li/PEOPS di-block copolymer gel electrolyte/LiFePO4 cell had a high charge-discharge efficiency of ∼99% during 30 cycles, while maintaining a discharge capacity of 124 mAh/g.

Cycle and Rate Properties of Mesoporous Tin Anode for Lithium Ion Secondary Batteries

Nara Hiroki;Fukuhara Yoshiki;Takai Azusa;Komatsu Masaki;Mukaibo Hitomi;Yamauchi Yusuke;Momma Toshiyuki;Kuroda Kazuyuki;Osaka Tetsuya

Chemistry Letters37(2)p.142 - 1432008年-2008年

CiNii

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ISSN:0366-7022

概要:A mesoporous Sn anode was electrodeposited in the presence of lyotropic liquid crystals made of nonionic surfactants. The introduction of mesoporous structure was effective for the accommodation of volume change of Sn during charge and discharge cycling of Li ions. The discharge capacity of the mesoporous Sn anode at 1 C rate was as high as 425 mA h g−1 at the 100th cycle, and that was as high as 320 mA h g−1 at the 100th cycle even though at 5 C rate.

Electrochemical Impedance Analysis on Degradation of Commercially Available Lithium Ion Battery during Charge–Discharge Cycling

Mukoyama Daikichi;Momma Toshiyuki;Nara Hiroki;Osaka Tetsuya

Chemistry Letters41(4)p.444 - 4462012年-2012年

CiNii

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ISSN:0366-7022

概要:The degradation of the commercial Li ion battery was analyzed by electrochemical impedance spectroscopy, where our previous proposed equivalent circuit was applied. The degradation with the cycling was clearly explained by the main parameters of capacitive and resistive components, i.e., it responded until 300 cycles to the decrease in capacitive component, while after 300 to 550 cycles to the increase in resistive component.

Carbon-coated Li2S Synthesized by Poly(vinylpyrrolidone) and Acetylene Black for Lithium Ion Battery Cathodes

Liu Jun;Nara Hiroki;Yokoshima Tokihiko;Momma Toshiyuki;Osaka Tetsuya

Chemistry Letters43(6)p.901 - 9032014年-2014年

CiNii

詳細

ISSN:0366-7022

概要:A carbon-coated Li2S was prepared through an adsorption and successive annealing process by using poly(vinylpyrrolidone) (PVP) and acetylene black (AB) as carbon source with Li2S powder. The coating layer was composed of amorphous carbon and embedded AB particles. The carbon coating was found to effectively alleviate the dissolution of polysulfide and the discharge capacity at the first 15 cycles was 800 mA h g−1 with gradual fading afterward.

Application of Electrochemical Impedance Spectroscopy to Ferri/Ferrocyanide Redox Couple and Lithium Ion Battery Systems Using a Square Wave as Signal Input

Yokoshima, Tokihiko; Mukoyama, Daikichi; Nakazawa, Kazuhiro; Gima, Yuhei; Isawa, Hidehiko; Nara, Hiroki; Momma, Toshiyuki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya; Osaka, Tetsuya

Electrochimica Acta180p.922 - 9282015年10月-2015年10月 

DOIScopus

詳細

ISSN:00134686

概要:© 2015 Published by Elsevier Ltd.To realize electrochemical impedance spectroscopy (EIS) using a simple measurement system, application of a square potential/current waveform to the input signals of EIS was investigated. The impedance of a simple redox reaction of [Fe(CN)6]4-/[Fe(CN)6]3- solution was measured by the potentio-EIS using a square waveform as the input signal, which was generated by a potentiostat system without a frequency response analyzer (FRA). A steady impedance response in the frequency range of 40 Hz-3.5 kHz was obtained, and the impedance was obtained by the potentiostat system with an FRA. The errors - the differences between the impedance measured by EIS with a square potential waveform and that of conventional EIS - were sufficiently low to allow impedance analysis. The impedance of a lithium-ion battery (LIB) was measured by galvano-EIS using a square waveform input signal generated by a power controller. A steady impedance response in the frequency range of 5 Hz-2.5 kHz was obtained, and the errors were sufficiently low to allow impedance analysis. It was demonstrated that both square potential-EIS (SP-EIS) and square current-EIS (SC-EIS) have great potential as simple systems for measuring impedance. Moreover, it was demonstrated that SC-EIS has potential as a simple measurement system for analyzing the state of an LIB. Thus, the potential of the SP/SC-EIS methodology was confirmed for electrochemical systems.

New approach for enhancing electrical conductivity of electrodeposited Si-based anode material for Li secondary batteries: Self-incorporation of nano Cu metal in Si–O–C composite

Jeong, Moongook; Ahn, Seongki; Yokoshima, Tokihiko; Nara, Hiroki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya; Osaka, Tetsuya

Nano Energy28p.51 - 622016年10月-2016年10月 

DOIScopus

詳細

ISSN:22112855

概要:© 2016 Elsevier LtdThe poor electrical conductivity of Si-based anode materials is a critical challenge for the development of high-performance Li secondary batteries. We propose a new approach for enhancing the electrical conductivity of an electrodeposited Si–O–C composite anode via self-incorporation of nano Cu metal (n-Cu) using a facile and inexpensive electrochemical synthetic method. The Si–O–C composite with n-Cu (Cu/Si–O–C composite) shows stable cycle performance with a fairly high specific capacity. Since Cu precursor ions for the electrodeposition of n-Cu are directly dissolved from a Cu substrate used as the current collector for the anode, electrical conducting additives that causes increase in the weight and volume of the electrode are not unnecessarily supplemented. In the synthesis process, the n-Cu metal and Si–O–C composite are electrodeposited simultaneously. The n-Cu/Si–O–C composite anode results in improved electrochemical performance, including enhancement of areal and specific capacity; coulombic efficiency; and rate capability. Electrochemical impedance spectroscopy suggests that such improvements in performance are due to the enhanced electrical conductivity resulting from the conductive network of the incorporated n-Cu. Moreover, the electrical conductive properties of the incorporated n-Cu suppress electrochemical degradation of the n-Cu/Si–O–C composite anode.

Electrophoretically deposited carbon nanotube anchor layer to improve areal capacity of Si-O-C composite anode for lithium secondary batteries

Ahn, Seongki; Jeong, Moongook; Yokoshima, Tokihiko; Nara, Hiroki; Momma, Toshiyuki; Momma, Toshiyuki; Momma, Toshiyuki; Osaka, Tetsuya; Osaka, Tetsuya

Journal of Power Sources336p.203 - 2112016年12月-2016年12月 

DOIScopus

詳細

ISSN:03787753

概要:© 2016 Elsevier B.V.In this study, we report the preparation of carbon nanotubes (CNTs) anchor layer on a Cu substrate (CNTs/Cu) by using electrophoretic deposition technique. The CNTs anchor layer increases adhesion strength between Si-O-C composites and Cu substrate, as a result, it is possible to improve deposited Si amounts and areal capacity. The electrodeposited Si-O-C composites on CNTs/Cu (Si-O-C/CNTs/Cu) show homogenously coated surface morphology without cracks even large passing charge for electrodeposition of 15 C cm−2, resulting in 0.21 mg cm−2 of deposited Si amounts. On the other hand, Si-O-C composites deposited on as-received Cu substrate (Si-O-C/Cu) begin to peel off from substrate at 8 C cm−2 of passing charge, resulting in 0.13 mg cm−2 of deposited Si amounts, and decrease down to 0.10 mg cm−2 at 15 C cm−2 of passing charge. As a results, the improved Si amounts deposited on CNTs/Cu substrate achieve higher areal capacity, delivering 0.24 mA h cm−2, which attains increase in 84.6% in comparison to Si-O-C/Cu, which has areal capacity of 0.13 mA g cm−2 at 8 C cm−2 of passing charge. Moreover, the Si-O-C/CNTs/Cu shows improved anode performances including discharge capacity and C-rate performance of the Si-O-C composites than Si-O-C/Cu without CNTs anchor layer.

書籍等出版物

J. Garche, C. K. Dyer, P. T. Moseley, Z. Ogumi, D. A. J. Rand, B. Scrosati (Eds.),Encyclopedia of Electrochemical Power Sources, “Micro Hybrid Power System: Fuel Cells/Capacitors”

T. Momma, H. Nara, T. Osaka

Elsevier2009年-

詳細

ISBN:978-0444535320

エヌ・ティー・エス(編), 「高性能蓄電池-設計基礎研究から開発・評価まで-」, 1編2章 「電池設計支援のための先端電気化学的評価方法」 pp. 171-183.

逢坂哲彌,門間聰之,奈良洋希

壮光舎印刷2009年 09月-

詳細

ISBN:978-4-86043-263-8

講演・口頭発表等

参照電極入ラミネート型リチウムイオン二次電池の基礎解析

第51回電池討論会2010年11月

詳細

口頭発表(一般)

Li二次電池用電解析出Si負極の作製条件の検討

電気化学秋季大会2010年09月

詳細

口頭発表(一般)

有機電解液中で電析したSiのLi二次電池用負極としての電気化学的特性評価

電気化学会第77回大会2010年03月

詳細

口頭発表(一般)

BMPFSI適用によるリチウム二次電池用ブロックコポリマーイオンゲル電解質の改良

電気化学会第77回大会2010年03月

詳細

口頭発表(一般)

リチウム二次電池負極を目的とし有機電解液中で電析したSn電極の基礎特性評価

第50回電池討論会2009年11月

詳細

口頭発表(一般)

インピーダンス応答変化の解析によるカソードPt触媒の劣化評価

第50回電池討論会2009年11月

詳細

口頭発表(一般)

スルホニル系有機添加剤によるリチウム溶解析出サイクルへの影響

日本化学会 第3回関東支部大会2009年09月

詳細

ポスター発表

イオン液体BMPTFSIを用いたリチウム二次電池用ジブロックコポリマーゲル電解質の評価

日本化学会 第3回関東支部大会2009年09月

詳細

ポスター発表

スルホニル系有機添加剤のリチウム金属負極への影響

電気化学会第76回大会2009年03月

詳細

口頭発表(一般)

リチウム二次電池用ジブロックコポリマ ー電解質可塑剤へのイオン液体適用の可能性

電気化学会第76回大会2009年03月

詳細

口頭発表(一般)

1M LiTFSI / BMPTFSI中でのNiSn合金負極特性と初期電流密度依存

第49回電池討論会2008年11月

詳細

口頭発表(一般)

In-situ応力測定を用いたリチウム二次電池用メソポーラスSn負極の充放電時の評価

電気化学会第75回大会2008年03月

詳細

口頭発表(一般)

表面酸化物制御によるリチウム二次電池用NiSn合金粉末負極の改良

第48回電池討論会2007年11月

詳細

口頭発表(一般)

TFSIアニオン系イオン液体を添加した有機電解液中でのリチウム金属負極特性に与える酸素溶存の効果

第48回電池討論会2007年11月

詳細

口頭発表(一般)

リチウムイオン二次電池用電析Sn負極へのメソポーラス構造の導入とその充放電特性

電気化学会秋季大会2007年09月

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口頭発表(一般)

リチウム二次電池用ジブロックポリマーゲル電解質の膜特性改良および評価

日本化学会第87春季年会2007年03月

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口頭発表(一般)

リオトロピック液晶相を用いたリチウムイオン二次電池用電析Sn系負極材料の作製

第47回電池討論会2006年11月

詳細

口頭発表(一般)

DMFC電解質内での物質移動による電圧損失を考慮したDMFC・キャパシタハイブリッドシステムの作動シミュレーション

第47回電池討論会2006年11月

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ポスター発表

小型電子機器用燃料電池・キャパシタハイブリッドシステムの作動シミュレーション

電気化学会第73回大会2006年04月

詳細

口頭発表(一般)

ジブロックポリマーゲル電解質のリチウム二次電池への応用

電気化学会第72回大会2005年04月

詳細

口頭発表(一般)

ジブロックポリマーの自己組織化を用いたリチウム 二次電池用ゲル電解質の作製

日本化学会第84春季年会2004年03月

詳細

口頭発表(一般)

PEO-LiX錯体を用いたポリマーブレンドのリチウム二次電池用電解質特性

電気化学会第70回大会2003年04月

詳細

口頭発表(一般)

PEO-LiXとPSの複合によるポリマーブレンドゲル電解質

電気化学秋季大会2002年09月

詳細

口頭発表(一般)

特許

整理番号:743

自在継手(日本)

高西 淳夫, 松岡 大樹, 小林 翔一郎, 奈良 洋希

特願2007-230858、特開2009- 63061、特許第5064153号

整理番号:778

リチウム二次電池、及びリチウム二次電池の製造方法(日本)

逢坂 哲彌, 門間 聰之, 巽 智香, 奈良 洋希

特願2007-293318、特開2009-123382、特許第5220388号

整理番号:1129

リチウム二次電池用活物質、リチウム二次電池用負極、およびリチウム二次電池(日本, PCT)

逢坂 哲彌, 門間 聰之, 横島 時彦, 奈良 洋希

特願2010-232941、特開2012- 89267、特許第5697078号

整理番号:1187

リチウム二次電池用活物質、リチウム二次電池用負極、およびリチウム二次電池(日本, PCT, アメリカ)

横島 時彦, 奈良 洋希, 逢坂 哲彌, 門間 聰之

特願2011- 68810、特開2012-204195

整理番号:1246

電池システムおよび電池の評価方法(日本, PCT, アメリカ)

逢坂 哲彌, 門間 聰之, 横島 時彦, 向山 大吉, 奈良 洋希

特願2011-226143、特開2013- 88148、特許第5850492号

整理番号:1320

電池システム及び電池システムの評価方法(日本, PCT, アメリカ)

逢坂 哲彌, 門間 聰之, 横島 時彦, 向山 大吉, 奈良 洋希

特願2012-223124、特開2014- 74686、特許第6004334号

整理番号:1379

電気めっき液、リチウム二次電池用活物質の製造方法、及びリチウム二次電池(日本)

逢坂 哲彌, 門間 聰之, 横島 時彦, 奈良 洋希

特願2012-248546、特開2014- 96321、特許第6057208号

整理番号:1385

電気化学システム(日本, PCT, アメリカ)

奈良 洋希, 逢坂 哲彌, 門間 聰之, 横島 時彦, 向山 大吉

特願2012-285550、特開2014-126532、特許第6226261号

整理番号:1390

リチウム二次電池活物質の製造方法、及びリチウム二次電池(日本)

逢坂 哲彌, 門間 聰之, 横島 時彦, 奈良 洋希

特願2013- 3754、特開2014-135239、特許第6090778号

整理番号:1538

金属表面の清浄化方法(日本, アメリカ)

逢坂 哲彌, 門間 聰之, 横島 時彦, 奈良 洋希

特願2014- 69692、特開2015-190030

整理番号:1931

組電池、電池モジュールおよび電池モジュールの評価方法(日本, PCT, アメリカ, 中華人民共和国)

向山 大吉, 奈良 洋希, 横島 時彦, 逢坂 哲彌

特願2017- 77004、特開2018-179652、特許第6561407号

現在担当している科目

科目名開講学部・研究科開講年度学期
ナノ電気化学特論大学院先進理工学研究科2019春学期

教育内容・方法の工夫

無機工業化学

2011年01月-2011年01月

新エネルギー技術(中央大学)

2011年04月-2011年07月

詳細

概要:現代社会のエネルギー消費について、特に電気エネルギー利用の観点から、社会的ニーズに対応するための発電、蓄電デバイスについて概説する。電気化学の概念を習得するとともに、化学エネルギーや物理エネルギーから電気エネルギーへと変換する反応を理解する。また電気エネルギー利用のための電気化学発電・蓄電デバイスの将来を議論する。