Structural, electrochemical and thermal properties of LiNi0.8-yTiyCo0.2O2 as cathode materials for lithium ion battery

被引：96

作者：

Liu, HS ^{[1
]}

Li, J ^{[1
]}

Zhang, ZR ^{[1
]}

Gong, ZL ^{[1
]}

Yang, Y ^{[1
]}

机构：

[1] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Dept Chem, Xiamen 361005, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 07期

基金：

中国国家自然科学基金;

关键词：

LiNi0.8Co0.2O2; titanium substitution; cycling performance; thermal stability; lithium ion batteries;

D O I：

10.1016/j.electacta.2003.11.001

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Multiple substitution compounds with the formula LiNi0.8-yTiyCo0.2O2 (0 less than or equal to y less than or equal to 0.1) were synthesized by sol-gel method using citric acid as a chelating agent. The effects of titanium substitution on the structural, electrochemical and thermal properties of the cathode materials are investigated. A solid solution phase (R-3m) is observed in the range of 0 less than or equal to y less than or equal to 0.1 for the titanium-doped materials. X-ray photoelectron spectroscopy (XPS) shows that there are Ni3+, Ni2+, Co3+, Co2+ and Ti4+ five transition metal ions in titanium-doped materials. Rietveld refinement of X-ray diffraction (XRD) patterns indicates that titanium substitution changes the materials' structure with different cationic distribution. An increase of the Ni/Co amount in the 3a Li site is found with the addition of titanium amount. An improved cycling performance is observed for titanium-doped cathode materials, which is interpreted to a significant suppression of phase transitions and lattice changes during cycling. The thermal stability of titanium-doped materials is also improved, which can be attributed to its lower oxidation ability and enhanced structural stability at delithiated state. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：1151 / 1159

页数：9

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