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成果報告書詳細
管理番号20190000000557
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)(国立大学法人名古屋大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人名古屋大学
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) Understanding of degradation mechanism of ternary positive electrode coated with Li-Nb-O

Thin films of NCM523 were prepared by pulsed laser deposition and their crystallinity and surface smoothness were investigated by x-ray diffraction (XRD), scanning electron microscopy, and atomic force microscopy. By adjusting deposition conditions such as kind of substrate, heating condition, and chamber pressure, thin films of NCM523 with high crystallinity and high smoothness were achieved.
Thin films of NCM523 were prepared by aerosol deposition (AD) and XRD measurements revealed that they have high crystallinity. Their basic electrochemical properties were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and charge-discharge measurements using liquid electrolyte cell. It was confirmed that the discharge capacity of the thin films was at most ca. 80% of theoretical value for NCM523.
In-situ contact angle measurement system was established by combining infrared heater and CCD camera. Contact angles of low melting point solid electrolytes were measured using the established system. It was clear that wettability of low melting point solid electrolytes depended on the kind of substrate and atmosphere, and that too high temperature caused reaction of low melting point solid electrolytes with substrates.
All-solid-state batteries were fabricated using NCM523 film deposited by AD, sulfide solid electrolyte and In-Li alloy. Electrochemical measurements were performed using the fabricated batteries.


(2) Development of low melting point solid electrolytes and study on their reactivity

Three solid electrolytes with a softening temperature below 500 ˚C were newly synthesized. It was revealed that wettability of these solid electrolytes on NCM523 was low. This is because crystallization temperature also shifts to lower.
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