A high-powered concentration-gradient Li(Ni0.85Co0.12Mn0.03)O2 cathode material for lithium ion batteries

被引：41

作者：

Du, Ke ^{[1
]}

Hua, Chuanshan ^{[1
]}

Tan, Chaopu ^{[1
]}

Peng, Zhongdong ^{[1
]}

Cao, Yanbing ^{[1
]}

Hu, Guorong ^{[1
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2014年 / 263卷

关键词：

Lithium ion batteries; Cathode materials; Concentration-gradient; High capacity; Rate performance; POSITIVE ELECTRODE MATERIALS; LI-ION; ELECTROCHEMICAL PROPERTIES; SIGNIFICANT IMPROVEMENT; LINI0.8CO0.15AL0.05O2; CATHODE; BEHAVIOR; SPECTROSCOPY; PERFORMANCE; PARTICLES; LICOO2;

D O I：

10.1016/j.jpowsour.2014.04.047

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 high-powered concentration-gradient cathode material with an average composition of Li(Ni0.85Co0.12Mn0.03)O-2 has been successfully synthesized by a co-precipitation method. The Li(Ni0.85Co0.12Mn0.03)O-2 has a core of Li(Ni0.9Co0.1)O-2 that is rich in Ni and a concentration-gradient shell having decreased Ni content and increased Mn content. The electrochemical properties of the concentrationgradient material are studied and compared to those of the core Li(Ni0.9Co0.1)O-2 material alone. In the concentration-gradient material of Li(Ni0.85Co0.12Mn0.03)O-2 , the Ni-rich core delivers a very high capacity, while the Mn-rich concentration-gradient shell improves the cycling stability and rate performance. The electrochemical properties of this cathode material are found to be far superior than those of the core Li(Ni0.9Co0.1)O-2 material. At room temperature, the initial capacity of the concentration-gradient Li(Ni0.85Co0.12Mn0.03)O-2 is 195 mAh g(-1) at 1C between 2.8 and 4.3 V and retains 95.5% after 100 cycles. Moreover, the composite has a good rate performance with a high capacity of about 190 mAh g(-1)even at 2C rate. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：203 / 208

页数：6

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