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成果報告書詳細
管理番号20190000000554
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)(国立大学法人京都大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人京都大学
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

1. Elucidation of solid electrolyte/electrode complex formation mechanism using synchrotron radiation
(i) Synthesis of solid electrolyte by liquid-phase shaking method
Li3PS4 Solid electrolyte was synthesized by liquid-phase shaking method, which had been developed by Toyohashi University of Technology. The ionic conductivity of the prepared Li3PS4 was approximately 0.1 mS / cm.

(ii) Synthesis of graphite/solid electrolyte composite by liquid-phase shaking method
Graphite/solid electrolyte composite was synthesized by liquid-phase shaking method. The composite exhibited approximately 200 mAh/g capacity with the powder-press cell.

(iii) Development of high energy X-ray diffraction and pair distribution function analysis
The high energy X-ray diffraction and pair distribution function analysis has been developed, which can quantitatively evaluate the ratio of starting material and final product in solid electrolyte synthesis process. In this analysis, trace amounts of unreacted substances that are undetectable by the conventional method, can be quantitatively evaluated. The correlation between the unreacted substances and ion conductivity was also confirmed. This analysis revealed that the ordered structure from medium to long distance of the Li3PS4 synthesized by the liquid phase shaking method was more developed than that of the Li3PS4 synthesized by the mechanical milling method.

(iv) Liquid-phase synthesis of solid electrolyte
The development of soft X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analysis has been proceeded, the analysis of S K-edge has been performed for the Li3PS4 synthesized by the liquid-phase shaking and by the mechanical milling methods. This analysis revealed that the ordered structure in short distance of the Li3PS4 synthesized by the liquid phase shaking method was more developed than that of the Li3PS4 synthesized by the mechanical milling method.
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