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成果報告書詳細
管理番号20190000000577
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(国立大学法人東京工業大学)
公開日2019/6/11
報告書年度2018 - 2018
委託先名国立大学法人東京工業大学
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Title: Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2020) FY2018 Annual Report

In this fiscal year, we developed experimental techniques for solid/solid interfaces in batteries as the advanced analysis group subject. Operando HAXPES is expected to be a powerful technique to elucidate a redox mechanism in all-solid-state battery. We have developed a novel all-solid-state thin film battery supported by a solid electrolyte substrate for operando HAXPES analysis. In this fiscal year, we succeeded in performing operando HAXPES measurements by using the batteries with a Li2MnO3 as a model cathode. Overall 81 O1s spectra were successfully obtained during the 1st charge process. A new peak assigned to an oxidized oxygen is generated at higher binding energy side above 3.7 V during 1st charge process. Then, the peak disappears below 3.3 V during the following 1st discharge process. These results indicate that an reversible oxygen redox occurs in Li2MnO3 model cathode. In addition, we developed a new technique to analyze valence band HAXPES spectrum. In this method, we utilizes carbon as a corrector instead of aluminum because of the drastically lower density of state near EF. We constructed a model battery with carbon as a collector and LiCoO2 as a cathode and performed an operando valence band analysis. We observed that the Co t2g peak located near EF shifted lower and higher side during charge and discharge process, respectively, indicating that cathode redox reaction during battery operation can be clearly seen by using carbon collector. Thus, we succeeded in demonstrating the usability of operando HAXPES as a battery reaction analysis technique through the above two results. We will utilize this technique to elucidate a charge-discharge mechanism of innovative battery, such as fluoride battery and conversion battery.
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