The effect of Al2O3-coating coverage on the electrochemical properties in LiCoO2 thin films

被引：60

作者：

Oh, Yuhong ^{[1
,2
]}

Ahn, Donggi ^{[1
,2
]}

Nam, Seunghoon ^{[1
,2
]}

Park, Byungwoo ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea

[2] Seoul Natl Univ, Res Ctr Energy Convers & Storage, Seoul 151744, South Korea

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2010年 / 14卷 / 07期

基金：

新加坡国家研究基金会;

关键词：

Li-ion battery; LiCoO2; Al2O3; Nanoscale coating; H2O scavenge; CYCLE-LIFE PERFORMANCE; CATHODE MATERIALS; COBALT DISSOLUTION; LITHIUM; STABILITY; ELECTRODES;

D O I：

10.1007/s10008-009-0946-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical properties of nanoscale Al2O3-coated LiCoO2 thin films were examined as a function of the coating coverage. Al2O3-coated LiCoO2 films showed enhanced cycle-life performance with increasing degree of coating coverage, which was attributed to the suppression of Co dissolution and F- concentration in the electrolyte. Moreover, an Al2O3-coating layer with partial coverage clearly improved the electrochemical properties, even at 60 A degrees C or with a water-contaminated electrolyte. Even though metal-oxide coating on LiCoO2 has been actively investigated, the mechanisms of nanoscale coating have yet to be clearly identified. In this article, surface analysis suggested that the Al2O3-coating layer had transformed to an AlF3 a (TM) 3H(2)O layer during cycling, which inhibited the generation of HF by scavenging H2O molecules present in the electrolyte.

引用

页码：1235 / 1240

页数：6

共 35 条

[1] Electrochemical stability in cerium-phosphate-coated LioO2 thin films [J].