Efffects of surface modification by MgO on interfacial reactions of lithium cobalt oxide thin film electrode

被引:91
作者
Iriyama, Y [1 ]
Kurita, H [1 ]
Yamada, I [1 ]
Abe, T [1 ]
Ogumi, Z [1 ]
机构
[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Nishikyo Ku, Kyoto 6158510, Japan
基金
日本科学技术振兴机构;
关键词
LiCoO2; thin film electrode; surface nnodification; pulsed laser deposition; lithium ion transfer; Li-ion batteries;
D O I
10.1016/j.jpowsour.2004.05.029
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Magnesium oxide (MgO)-modified lithium cobalt oxide (LiCoO2) thin film electrodes were prepared by pulsed laser deposition (PLD) and effects of surface modification by MgO on interfacial reactions of LiCoO2 were studied. The modification by MgO was carried out by PLD on LiCoO2 thin film electrode successively after the deposition of LiCoO2 thin film by PLD. Auger electron spectroscopy suggested that Mg dispersed uniformly in nano-scale on the film electrode. Cyclic voltammetry measurements clearly showed that MgO modification suppresses the increase of resistances caused by repetition of lithium-ion insertion-extraction reaction charged up to 4.2 V versus Li/Li+. Moreover, MgO modification decreased the activation energy of lithium-ion transfer reaction at LiCoO2 thin film electrode-electrolyte interface, indicating that the modification by MgO affects the kinetics of lithium-ion transfer reaction at LiCoO2-electrolyte interface. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:111 / 116
页数:6
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