Effect of carbon coating on electrochemical performance of Li1.048Mn0.381Ni0.286Co0.286O2 cathode material for lithium-ion batteries

被引：90

作者：

Shi, S. J.

Tu, J. P. ^{[1
]}

Mai, Y. J.

Zhang, Y. Q.

Gu, C. D.

Wang, X. L.

机构：

[1] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2012年 / 63卷

关键词：

Layered oxide; Carbon coating; Magnetron sputtering; Lithium ion battery; 4.5; V; SURFACE MODIFICATION; SECONDARY BATTERIES; CAPACITY RETENTION; INSERTION MATERIAL; MANGANESE-OXIDE; LICOO2; LICO1/3NI1/3MN1/3O2; ELECTRODES; MN;

D O I：

10.1016/j.electacta.2011.12.082

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Carbon-coated layered oxide Li1.048Mn0.381Ni0.286Co0.286O2 is prepared by combining a co-precipitation and a direct current magnetron sputtering. TEM images show that the carbon layer is relatively well coated on the surface of oxide particles. The Li1.048Mn0.381Ni0.286Co0.286O2/C composite delivers an initial discharge capacity of 203.2 mAh g(-1) between 2.5 and 4.5 V at 0.1 C, and 94% of the initial discharge capacity can be retained after 100 cycles. Moreover, the carbon-coated oxide exhibits noticeable high-rate capacity of 145 mAh g(-1) at 5 C. much higher than the pristine one (103 mAh g(-1) at 5C). The improved discharge capacity and cycle performance are attributed to the carbon coating, which protects the Li-rich cathode material from reacting with the electrolyte and retarding the incrassation of SEI film on the surface of oxide particles. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：112 / 117

页数：6

共 48 条

[1] Factors influencing the irreversible oxygen loss and reversible capacity in layered Li[Li1/3Mn2/3]O2-Li[M]O2 (M=Mn0.5-yNi0.5-yCo2y and Ni1-yCoy) solid solutions [J].