成果報告書詳細
管理番号20130000000260
タイトル*平成22年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業(燃料電池・蓄電池) リチウムイオン二次電池負極材に黒鉛ナノファイバーを利用した新規電極構造の技術開発
公開日2014/3/19
報告書年度2010 - 2010
委託先名平松産業株式会社 国立大学法人信州大学
プロジェクト番号P10020
部署名技術開発推進部
和文要約
英文要約Title: New Energy Technology Research Development/New Energy Venture Business Technology Innovation Program (Fuel Cells and Batteries) / The study of graphite nano-fiber non-woven fabrics as anode materials of lithium batteries. (FY2009-FY2010) FY2010 Annual Report.

In general, there is a trade-off between high-rate performances and battery capacities in a battery design. For example, cathode/anode materials are thinly and widely coated to improve high-rate performances, which results in increasing the use of current collectors and separators. In contrast, battery capacities decrease because of reduction in volumes of cathode/anode materials. To overcome the weak point, this study develops graphite nano-fiber non-woven fabrics as anode materials of lithium batteries. The main purposes of this study are 1) to establish the method of producing graphite nano-fiber non-woven fabrics and 2) to commercialise and promote them to electric manufacturing companies. In this study, targets at applying our product are mainly next generation vehicles and high-energy mobile equipments. Since these items require both high-rate performances and battery capacities, traditional batteries may not be applicable enough because of the trade-off. Compared to them, our materials have the merits of: 1) improving high-rate performances, and 2) omitting an anode production process. As a result, our product can maintain both high-rate performances and battery capacities, which can contribute to improve the quality of next generation vehicles and high-energy mobile equipments. We have increased the capacity of graphite nano-fiber non-woven fabrics from 216mAh/g to 216mAh/g by reducing the ratio of polyvinyl alcohol. We have increased the capacity of graphite nano-fiber non-woven fabrics at high current density (20C) from 4.54% to 8.54% compared with low current density (0.2C) by press the non-woven fabrics to improve the density. The flexibility of the non-woven fabrics have increased by long air oxidation and the sample can roll up around 1mm diameter metal tube. The carbon fibers could be produced by crushing the non-woven fabrics and the capacity and the high-rate capacity is lager than the non-woven fabrics owing to large surface area. The carbon fibers also had high performance for conductor of cathode material. The surface resistance of the cathode containing our carbon fibers was 80 ohm/sq, on the other hand, the surface resistance of the cathode containing acetylene black was 21,000 ohm/sq.
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