成果報告書詳細
管理番号100012555
タイトル*平成19年度中間年報 次世代自動車用高性能蓄電システム技術開発 次世代技術開発 全固体電池のための固体電解質及び三次元メソ構造体電極の研究開発
公開日2009/4/24
報告書年度2007 - 2007
委託先名国立大学法人東京工業大学
プロジェクト番号P07001
部署名燃料電池・水素技術開発部
和文要約以下本編抜粋:1.研究開発の内容及び成果等全固体電池は安全性に優れた究極の電池形態である。しかし、液体電解質を用いたリチウムイオン電池に比べ、その電池特性は遠く及ばない。その律速過程は、電解質そのものの材料特性に起因する。本申請では、安全性を確保し高出力・高エネルギー密度が可能な全固体リチウム電池を開発するため、新規な固体電解質の創成と、高エネルギー密度を目指した新たな電極構造の創出を試みた。
英文要約Title: Development of High-performance Battery System for Next-generation Vehicles / Technical Development for Next-generation / Research & Development of solid electrolyte for all solid-state battery and electrode with three dimensional meso-structure (FY2005-FY2006) FY2005 Annual Report The present studies were focused on the following subjects; (I) material designs for new solid electrolyte based on the thio-LISICON electrolyte, and (ii) all solid-state lithium batteries with sulfur electrode. (I) New solid electrolyte system based on the thio-LISICON was studied. The solid solution formation was found in the iodide substitution system for 0≦x≦0.05 in Li3.25Ge0.25P0.75S4-x/2Ix A new phase was found for the composition of 0.1≦x≦0.4 and was indexed by a tetragonal system, a=8.935 A, b=5.934 A. The composition Li3.25Ge0.25P0.75S4-x/2Ix (0≦x≦1.0) synthesized at 500℃ showed the highest ionic conductivity of 1.5×10-3 S/cm at 25℃ at a composition of x=0.1 (Li3.25Ge0.25P0.75S3.95I0.1). (ii) All solid-state battery with sulfur electrode was studied. The charge-discharge characteristics of sulfur electrode were improved by gas phase mixing with sulfur and acetylene black (AB) as a conductive material. The composite electrode with sulfur and AB showed a capacity of 420 mAh/g at a current density of 0.13 mA/cm2. The resistance for lithium migration at the interface between electrolyte and positive electrode was reduced by gas phase mixing.
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