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成果報告書詳細
管理番号20190000000607
タイトル*2018年度中間年報 革新型蓄電池実用化促進基盤技術開発(公立大学法人兵庫県立大学)
公開日2019/6/14
報告書年度2018 - 2018
委託先名公立大学法人兵庫県立大学
プロジェクト番号P16001
部署名次世代電池・水素部
和文要約
英文要約Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2020) FY2018 Annual Report, University of Hyogo, Japan

As a cathode material of fluoride ion battery, fluorine-graphite intercalation compound, CxF, is a promising material. It delivers relatively high capacity when metal fluoride (MxF) is added. The structural change of the electrode containing CxF and MxF during charge-discharge cycle was investigated by X-ray diffraction. It was found that the added MxF was reversibly reacted around 0.7 V and, the discharge and charge reaction of CxF occurred at 0.4 V and 1.6 V, respectively. Various carbon materials were tested for the cathode of fluoride ion battery. Ball milling of them lowered the charge voltage. Among them, the carbon material prepared at 700°C showed highest discharge capacity of 37 mAh/g at 100°C. The addition of Cu nano-particles to it increased the capacity to 150 mAh/g.
As an electrolyte material, fluorite-type barium fluoride was prepared via mechanical milling process by using agate or tungsten carbide balls. In this work, various BaF2 electrolytes were prepared by changing weight ratios of ball to powder (B/P), and milling time. The maximum conductivity was obtained in the case of WC balls with B/P ratio = 40/1. The conductivity was suggested to be enhanced due to the introduction of fluorine vacancies in the specimen by charge compensation of substituting oxide ions into the fluoride ion site during the milling process. The main reason for the conductivity enhancement by micronizing BaF2 fluoride is probably due to the increase in fluorine vacancy concentration by introduction of oxygen.
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