Improvement of electrochemical stability of LiCoO2 cathode by a nano-crystalline coating

被引：82

作者：

Zhao, HL ^{[1
]}

Ling, G ^{[1
]}

Qiu, WH ^{[1
]}

Zhang, XH ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Dept Inorgan Nonmet Mat, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2004年 / 132卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

lithium ion battery; lithium cobalt oxide; coating; electrochemical stability;

D O I：

10.1016/j.jpowsour.2004.01.036

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：

A nano-crystalline MgO coating was formed on the surface of LiCoO2 particle via a sol-gel method. MgO coating can improve the cycling stability of LiCoO2 significantly. After the 40th cycle a discharge capacity of more than 120 mAh/g was remained for I mol% MgO-coated LiCoO2, while only 13 mAh/g for pristine LiCoO2 when both charged up to 4.7 V. During heat treatment and charge/discharge process, Mg2+ in coatings will diffuse into LiO2-layers of LiCoO2 which does not cause any detectable shift in X-ray diffractometer (XRD) peak positions, but does impact the XRD peak intensity due to the aberrance of (0 0 3) plane. Mg2+ ions existing in LiO2-layers will stabilize the lattice structure of LiCoO2, hence improve the cycling performance of LiCoO2 cathode. More MgO coating on LiCoO2 is detrimental to the electrochemical properties of LiCoO2 cathode, probably due to the electrochemical inactivity of MgO particles. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：195 / 200

页数：6

共 23 条

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