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成果報告書詳細
管理番号20170000000242
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(国立大学法人東京工業大学)
公開日2017/11/14
報告書年度2016 - 2016
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
部署名スマートコミュニティ部
和文要約
英文要約Title: Research & Development Initiative for Scientific Innovation of New Generation Batteries 2(RISING2); (FY2016-FY2018) FY2016 Annual Report

In this fiscal year, we developed the materials and experimental techniques for solid/solid interfaces in batteries as the advanced analysis group subject. The Li1.2±x(Mn,Ni,Co)0.8O2(001) and Li2MnO3(001) epitaxial films were successfully fabricated on the single crystal substrates by pulsed laser deposition (PLD) technique. A disordered rocksalt type phase was formed in the Li1.2±x(Mn,Ni,Co)0.8O2(001) films synthesized using the PLD target of a highly excess lithium content. A conrol of the lithium content in the target materials was important for obtaining highly crystalline Li1.2±x(Mn,Ni,Co)0.8O2(001) films with the layered rocksalt type structure. The film electrodes could provide model electrode/solid electrolyte interfaces suitable for mechanistic studies on electrochemical reactions in all solid-state batteries. Amorphous Li3PO4 film was stacked on the Li2MnO3(001) films by RF magnetron sputtering and a model electrode/solid electrolyte interface was fabricated. The electrochemical properties were investigated using a liquid-type cell. The Li3PO4/Li2MnO3 cathode exhibited superior cycle stability and rate capability compared with the Li2MnO3 single layer cathode. These results indicate that the stable lithium (de)intercalation reaction proceeds through the solid-solid interface. Then, we developed thin-film batteries consisted of the Li/Li3PO4/Li2MnO3/SrRuO3/SrTiO3 stacking sequence, in which lithium anode film was deposited on the Li3PO4/Li2MnO3. We also confirmed the reversible reaction for the film battery. In-situ synchrotron X-ray diffraction analyses indicated different structural changes at the Li2MnO3/Li3PO4 interface from those at the Li2MnO3/liquid electrolyte interface. In the next fiscal year, we will develop electrochemical impedance spectroscopy and transmission electron microscopy analyses for our model solid/solid interfaces for further understanding of the interfacial phenomena.
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