Shigehiro Kawauchi | Researchain

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Physical Chemistry Chemical Physics | 2017

Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by mu+SR

Izumi Umegaki; Shigehiro Kawauchi; Hiroshi Sawada; Hiroshi Nozaki; Yuki Higuchi; Kazutoshi Miwa; Yasuhito Kondo; Martin Månsson; Mark T. F. Telling; Fiona C. Coomer; S.P. Cottrell; Tsuyoshi Sasaki; Tetsuro Kobayashi; Jun Sugiyama

In order to study a diffusive behavior of Li+ in Li intercalated graphites, we have measured muon spin relaxation (μ+SR) spectra for C6Li and C12Li synthesized with an electrochemical reaction between Li and graphite in a Li-ion battery. For both compounds, it was found that Li+ ions start to diffuse above 230 K and the diffusive behavior obeys a thermal activation process. The activation energy (Ea) for C6Li is obtained as 270(5) meV, while Ea = 170(20) meV for C12Li. Assuming a jump diffusion of Li+ in the Li layer of C6Li and C12Li, a self-diffusion coefficient DLi at 310 K was estimated as 7.6(3) × 10-11 (cm2 s-1) in C6Li and 14.6(4) × 10-11 (cm2 s-1) in C12Li.

Journal of The Electrochemical Society | 2012

Theoretical and Experimental Analysis of Porous Electrodes for Lithium-Ion Batteries by Electrochemical Impedance Spectroscopy Using a Symmetric Cell

Nobuhiro Ogihara; Shigehiro Kawauchi; Chikaaki Okuda; Yuichi Itou; Yoji Takeuchi; Yoshio Ukyo

Journal of Power Sources | 2009

Analysis of the Galvanostatic Intermittent Titration Technique (GITT) as applied to a lithium-ion porous electrode

Dennis W. Dees; Shigehiro Kawauchi; Daniel P. Abraham; Jai Prakash

Journal of Power Sources | 2007

Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance

Hiroki Kondo; Youji Takeuchi; Tsuyoshi Sasaki; Shigehiro Kawauchi; Yuichi Itou; Osamu Hiruta; Chikaaki Okuda; Masao Yonemura; T. Kamiyama; Yoshio Ukyo

Journal of Power Sources | 2014

Numerical simulation of thermal behavior of lithium-ion secondary batteries using the enhanced single particle model

Naoki Baba; Hiroaki Yoshida; Makoto Nagaoka; Chikaaki Okuda; Shigehiro Kawauchi

Archive | 2005

Charge/discharge control device of secondary battery

Makoto Ishikura; Shigehiro Kawauchi; Tetsuo Kobayashi; Masahiko Mitsui; Kazuhiko Mukai; Yuji Nishi; Itsuki Sasaki; 正彦三井; 厳佐々木; 和彦向; 哲郎小林; 滋博川内; 誠石倉; 勇二西

Archive | 2000

Fault determination apparatus and fault determination method for a battery set

Yoshiaki Kikuchi; Shigehiro Kawauchi

Archive | 2005

Lithium ion secondary battery and manufacturing method of the same

Osamu Hiruta; Yuichi Ito; Shigehiro Kawauchi; Hideyuki Nakano; Naruaki Okuda; Itsuki Sasaki; Yoji Takeuchi; Shoichi Tsujioka; Yoshio Ukiyou; 秀之中野; 勇一伊藤; 厳佐々木; 良雄右京; 匠昭奥田; 滋博川内; 要二竹内; 修蛭田; 辻岡章一

Archive | 2005