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成果報告書詳細
管理番号20170000000243
タイトル*平成28年度中間年報 革新型蓄電池実用化促進基盤技術開発(国立大学法人東京農工大学)
公開日2017/11/14
報告書年度2016 - 2016
委託先名国立大学法人東京農工大学
プロジェクト番号P16001
部署名スマートコミュニティ部
和文要約
英文要約Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2018) FY2016 Annual Report, Tokyo University of Agriculture and Technology, Japan

To realize innovative battery systems using conversion-type metal fluorides and insertion-type metal sulfides as positive electrodes (PEs) with high specific capacities, stabilized Si negative electrodes (NEs) was developed by the modification of Li pre-doping technique. In the first year, we prepared three electrolytes, i.e. EC-, PC- and glyme-type ones, and utilized them as the electrolyte for the Li pre-doping to Si NEs. As the results, the Li-Si alloy NEs exhibited better charge/discharge performances for the half-cell tests than the pristine Si NEs, and the EC-type electrolyte gave the best effect for the stabilization of Si NEs (over 200 charge/discharge cycles at the capacity limiting condition of 1000 mAh g-1). Extension of pre-doping time and addition of a F-containing compound into the Li pre-doping electrolytes were quite effective to improve the homogeneity of Li pre-doping and the reversibility of charge/discharge (Li-Si alloying/de-alloying) reaction by the formation of LiF-rich SEI films on the surface of Li-Si NEs. Applying an aromatic binder to the Li pre-doping technique enhanced the stability of the Li pre-doped Si NEs compared with a water soluble one. The aromatic binder suppressed the generation of crack in the Li-Si NEs. In addition to the above tests, we also explored a new Li pre-doping technique using a Li-complex solution as Li source and applied to the Si NEs for expansion of the electrode area for the practical use. Consequently, Li pre-doping to the Si NEs was successfully achieved by using the Li-complex solution and provide a homogeneous surface to the resulting Li-Si NEs. However, the depth of Li pre-doping was still low and needed to be improved by control of Li-complex concentration and molecular structure of the ligand. Through the investigations, the suitable conditions for Li pre-doping was successfully attained to prepare the stable Li-Si alloy NEs for innovative battery systems. We are planning to analyze the interphase of the obtained Li-Si NEs including SEI films in more detail by the high performance analytical machines under the RISING2. Also, we will conduct the interphase analysis by SPM apparatus using model Si thin film electrodes.
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