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成果報告書詳細
管理番号20170000000220
タイトル*平成28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2017/11/14
報告書年度2016 - 2016
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
部署名スマートコミュニティ部
和文要約
英文要約Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2018) FY2016 Annual Report, University of Hyogo, Japan


We investigated cathode and anode materials for the fluoride battery application. As a cathode material of fluoride ion battery, fluorine-graphite intercalation compound, CxF is promising because it shows both electric and fluoride ion conductivity. High operation voltage is also expected. Theoretical capacity reaches 865 mAh/g, when C/F ratio is unity. However, both discharging of CxF and charging of graphite in an all solid state electrochemical cell were quite difficult. Previous studies indicated that the addition of CuF2 to CxF was effective to promote the discharge reaction of it, however, it was still difficult to achieve full discharge of it. In this study, in order to increase the utilization of CxF, the effect of surface coating of it was investigated.
Surface coating of CxF with an element “A” was quite effective to deliver a large capacity of 480 mAh/g and the utilization of it reached 93 % at a low temperature of 50°C. XPS analysis of the electrode indicated that the reduction of CuF2 added to the electrode to Cu metal was responsible for the improved electrochemical properties.
As an anode protection layer exhibiting F- conductivity is required. We investigated (Ca0.5Ba0.5)F2 and (Ba0.6La0.4)F2.4 solid electrolytes in detail. By using mechanical milling method, and investigating the effects of milling time, ball to powder ratio, and pressure for pelletizing on conductivity, (Ca0.5Ba0.5)F2 powder sample with high conductivity could be obtained. It was found that the size of grains, the degree of solid solution of Ca into the BaF2 lattice, and higher pressure for pelletizing are the three main factors to determine the conductivity, and as a result, the conductivity of this material exceeded 10-5 S cm-1, our target value of ion conductivity, at 393 K.
A similar approach for (Ba0.6La0.4)F2.4-based systems resulted in the development of the fluorite-type fluoride powder sample with the highest conductivity. Its conductivity value exceeded 10-5 S cm-1 at 365 K.
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