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成果報告書詳細
管理番号20190000000567
タイトル*2018年度中間年報 先進・革新蓄電池材料評価技術開発(第2期)(国立大学法人群馬大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人群馬大学
プロジェクト番号P18003
部署名次世代電池・水素部
和文要約
英文要約Title: Development of Fundamental technologies for All Solid State Battery applied to
Electric Vehicles (FY2018 - FY2020) FY2018 Annual Report

Outline and Achievements of Research & Development

Development of common basic technology for the next generation of all-solid-battery

(i) Thermal stabilities of Li2S-SnS2 based sulfide solid electrolytes
Li2S-SnS2 based glasses are synthesized by using mechanical milling (MM) technique at room temperature.
The glass (a-Li4SnS4) powder for a nominal composition of 67.7Li2S E33.3SnS2 (mol%) (composition Li4SnS4)in the Li2S-SnS2 system were mainly prepared by MM treatment for the mixed powder of Li2S and SnS2 as starting material at room temperature. The glass powder result in one exothermic peak at around 380 degrees [Celsius] during heating process of differential scanning calorimetry (DSC) measurements. The exothermic peak means crystallization behavior of a-Li4SnS4 powder. Li4SnS4 glasses have high crystallization temperature compered to Li2S-P2S5 glasses. The 67.7Li2S E33.3SnS2 glass phase exhibited relatively the high thermal stability. Moreover, glass ceramics containing an orthorhombic Li4SnS4 crystal was formed by heat treatment of a-Li4SnS4 powder at 400 degrees [Celsius] in Ar atmosphere.

(ii) Atmospheric stability evaluation of Li2S-SnS2 based sulfide solid electrolytes
Their glass and glass ceramic powder exhibited a higher chemical stability than the Li3PS4 glass powder from the results of H2S gas generation measurements in air. It was found that sulfide-based solid electrolytes in the Li2S-SnS2 system have the high chemical
and thermal stabilities.

(iii)Thermal behavior of Li2S-SnS2 based sulfide solid electrolytes after atmospheric stability evaluation
The sample powder after H2S gas generation measurements of their glass and glass ceramic powder show an endothermic peak at around 200 degrees [Celsius] during heating process of DSC measurements in Ar atmosphere. In addition, the exothermal peaks were not observed at the temperature range of room temperature to 450 degrees [Celsius] during heating process. Such results suggested that the sulfide-based solid electrolytes in the Li2S-SnS2 system after H2S gas generation measurements in air show the high thermal stabilities without an exothermal reaction. The differential scanning calorimetry (DSC) methods should be effective to evaluate chemical and thermal stabilities of the various solid electrolytes as all-solid-state batteries.
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