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成果報告書詳細
管理番号20190000000566
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)(国立大学法人北海道大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人北海道大学
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

 Preparation of composite electrodes by using solution processes

 Hokkaido University group has been studied the preparation of composite electrode using solid electrolyte precursor solution of sulfide-based solid electrolytes. A slurry with an electrode active material, a binder, a conductivity additive, and a dispersant in a solution of a solid electrolyte precursor solution is firstly prepared. Then, by drying the slurry, electrode composite was obtained, and all solid state battery using these composite electrodes is evaluated.
 In this fascial year, the direct synthesis of solid electrolytes in the system of Li2S-P2S5 and Li6PS5X (X=Cl、Br、I), from Li2S, P2S5 and LiX (X=Cl, Br. and I) has been studied. Preparation of composite electrode using solid electrolyte precursor solution of sulfide-based solid electrolyte was also studied.

(1) Preparation of sulfide-based solid electrolyte using solution processes
 Solvents that are suitable for dispersion of graphite and also are applicable to liquid phase synthesis have been explored. For the preparation of sulfide-based solid electrolyte, Li2S, P2S5, LiX (X = Cl, Br, I, etc.) were dispersed or dissolved in a solvent that are suitable for dispersion of graphite.
 Li2S, P2S5, and LiCl were dispersed in a mixture of acetonitrile and another solvent that are added for improving dispersion, and the solution was treated by ultrasonic bath at 60 °C. After removal of solvent from the system, Li6PS5Cl was obtained within a total of 3 hours. The conductivity at room temperature was 0.1mS/cm.
 Liquid phase synthesis of Li7P3S11 solid electrolyte was also studied, by using Li2S and P2S5 as the starting materials and acetonitrile as solvent. Crystalline of Li7P3S11 was obtained by removal of the solvent of the precursor solution and heat treatment at 220 °C. The conductivity at room temperature was found to be about 1mS/cm.

(2) Preparation of composite electrodes using solution process
 In this fiscal year, the dispersion of graphite in sulfide solid electrolyte precursor solution and synthesis of electrode composite from this system have been studied.
A small amount of a nonionic surfactant (dispersant) was added to improve the dispersion of graphite and to control the particle size of the solid electrolyte, in the process of preparing the electrode composite, but the amount of the surfactant is increased, the cell resistance of the all-solid battery using the obtained composite electrode was increased. Even when the final heat treatment temperature for the preparation of the composite was 350 °C, a reaction between the sulfide solid electrolyte and the graphite was not confirmed, and the cell resistance was decreased because of the increase in the ionic conductivity of the solid electrolyte with high heat treatment temperature.
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