成果報告書詳細
管理番号20120000001209
タイトル*平成21年度~平成22年度のうち平成21年度分中間年報 開発項目「新エネルギー技術研究開発/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2012/12/19
報告書年度2009-2009
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
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
(1)テーマの概要
本事業にてピッチ系黒鉛ナノファイバー不織布の製造方法を開発しリチウムイオン二次電池負極材料(活物質)として電池メーカーに販売する。
英文要約Title: New Energy Technology Research Development/ New Energy Venture Business Technology Innovation Program (Fuel Cell and Battery) / The study of graphite nano-fiber non-woven fabrics as anode materials of lithium batteries. (FY2009-FY2010) FY2009 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 pf curent 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. This study targets at applying our product to 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 developed graphite nano-fiber non-woven fabrics less than 1 μm at diameter so far, and they perform as follows: A charge/discharge capacity of anode is 216mA/g. Although its value is less than traditional batteries (283mA/g), a capacity retention level is 49% compared to 15% of the traditional one. This study also finds that the charge/discharge capacity changes within 10% at 100 cycles, which demonstrates durability. A surface area is 1.5 times larger than traditional batteries. As for a marketing goal, we aim not at replacing traditional batteries, but at designing our original ones to battery manufacturing companies.
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