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Characterization of electrode/electrolyte interface for lithium batteries using ${it in situ}$ synchrotron X-ray reflectometry; A New experimental technique for LiCoO$$_{2}$$ model electrode

X線反射率測定によるリチウムイオン電池正極LiCoO$$_{2}$$/溶液界面の構造解析

平山 雅章*; 園山 範之*; 安部 武志*; 箕浦 真知子*; 伊藤 真純*; 森 大輔*; 山田 淳夫*; 菅野 了次*; 寺嶋 孝仁*; 高野 幹夫*; 田村 和久  ; 水木 純一郎

Hirayama, Masaaki*; Sonoyama, Noriyuki*; Abe, Takashi*; Minoura, Machiko*; Ito, Masumi*; Mori, Daisuke*; Yamada, Atsuo*; Kanno, Ryoji*; Terashima, Takahito*; Takano, Mikio*; Tamura, Kazuhisa; Mizuki, Junichiro

パルスレーザー堆積法により作成したLiCoO$$_{2}$$エピタキシャル薄膜を電極として、X線反射率測定により、電極/溶液界面の構造解析を行った。薄膜成長後に形成された不純物層が溶液に浸漬することで溶解し、新たなSEI層が形成されることがわかった。(110)面では、充放電によりラフネスが増加するが、(003)面では変化がないことがわかった。

A new experimental technique was developed for detecting structure changes at electrode/electrolyte interface of lithium cell using X-ray reflectometry and two-dimensional model electrodes with a restricted lattice-plane. The electrodes were constructed with an epitaxial film of LiCoO$$_{2}$$ synthesized by pulsed laser deposition method. The anisotropic properties were confirmed by electrochemical measurements. ${it Ex situ}$ X-ray reflectivity measurements indicated that the impurity layer existed on the as-grown LiCoO$$_{2}$$ was dissolved and a new SEI layer with lower density was formed after soaking into the electrolyte. ${it In situ}$ X-ray reflectivity measurements indicated that the surface roughness of the intercalation (1 1 0) plane increased with applying voltages, while no significant changes in surface morphology were observed for the intercalation non-active (0 0 3) plane during the pristine stage of the charge-discharge process.

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パーセンタイル:90.21

分野:Chemistry, Physical

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