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成果報告書詳細
管理番号20190000000570
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)(地方独立行政法人大阪産業技術研究所)
公開日2019/6/11
報告書年度2018 - 2018
委託先名地方独立行政法人大阪産業技術研究所
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. Outline and Achievements of Research and Development
(1) Purpose and Summary
Binders are usually used to adhere battery materials on metal foils in commercial slurry coating process for lithium ion batteries. However, the binders prevent lithium-ion and electron conduction in batteries. Removal of binders from solid-state batteries could improve the battery performance. In all-solid-state batteries, battery materials don't disperse into electrolyte unlike liquid electrolyte without binder. Thus, once solid-state batteries were fabricated, binders are not required inside. In this research (FY2018-FY2020), we propose the new practical process to fabricate binder-free sheet-type all-solid-state batteries by using a volatile binder. In this year (FY2018), we used a crystalline sulfide solid electrolyte as the standard electrolyte, and found polymer materials available as volatile binders. Moreover, we optimized the condition to fabricate standard electrolyte sheets and composite cathode sheets containing the volatile binders.

(2) Achievement of FY2018
We evaluated 5 kinds of modified PPC as volatile binders in slurry with the standard electrolyte. After the vacuum heat treatment of the slurry, the conductivity of the electrolyte became the same as the one before the vacuum heat treatment. It means that removal of the modified PPC by the vacuum heat treatment does not decrease the conductivity of the standard electrolyte. We also fabricated electrolyte sheets using the modified PPC and standard electrolytes. The thickness of the sheets was controllable. The electrolyte sheets showed good handling properties against peel, bend and punching tests. The composite cathode sheets were fabricated from the slurry of composite cathode materials NCM, standard electrolyte, acetylene black and the modified PPC in solvent. These electrolyte sheets and the composite cathode sheets should enable to fabricate binder-free sheet-type all-solid-state lithium-ion batteries.
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