Effect of synthesis conditions on electrochemical properties of LiNi1-yCOyO2 cathode for lithium rechargeable batteries

被引：102

作者：

Hwang, BJ ^{[1
]}

Santhanam, R ^{[1
]}

Chen, CH ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Microelectrochem Lab, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF POWER SOURCES | 2003年 / 114卷 / 02期

关键词：

capacity retention; lithium-ion battery; lithium nickel oxides; R-factor; sol-gel process; synthesis conditions;

D O I：

10.1016/S0378-7753(02)00584-0

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：

LiNi1-yCoyO2 samples are prepared by a sol-gel method at various cobalt concentrations (y-value) by sintering at 800 degreesC for a period of 10 h. An X-ray diffraction technique is used to examine the structural properties of the samples. The sample with a y-value of 0.25 has the largest initial discharge capacity and shows the best cycling performance. It is concluded that this performance results from better hexagonal ordering, crystallinity, and smaller particle size with good particle-size distribution compared with other samples. LixNi0.75Co0.25O2 samples with different lithium content are also prepared and it is found that Li1.05Ni0.75CO0.25O2 shows the best electrochemical performance. This suggests that the presence of excess lithium prevents the exchange of Ni2+ ions at lithium sites. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：244 / 252

页数：9

共 34 条

[1] Structure and electrochemical properties of Li-1-x(NiyCO1-y)(1+x)O-2 - Effect of chemical delithiation at 0 degrees C [J].