Comparison of the electrochemical behaviors of stoichiometric LiNi1/3Co1/3Mn1/3O2 and lithium excess Li1.03(Ni1/3Co1/3Mn1/3)0.97O2

被引：84

作者：

Choi, J ^{[1
]}

Manthiram, A ^{[1
]}

机构：

[1] Univ Texas, Mat Sci & Engn Program, Austin, TX 78712 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2004年 / 7卷 / 10期

关键词：

D O I：

10.1149/1.1792271

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Layered oxide cathodes LiNi1/3Co1/3Mn1/3O2 and Li-1.03(Ni1/3Co1/3Mn1/3)(0.97)O-2 have been synthesized by firing appropriate amounts of the coprecipitated hydroxides of Ni, Co, and Mn with lithium hydroxide at 900 degrees C for 24 h and characterized by X-ray diffraction and wet chemical analysis. The lithium excess cathode Li-1.03(Ni1/3Co1/3Mn1/3)(0.97)O-2 was found to exhibit better cyclability and rate capability than the stoichiometric LiNi1/3Co1/3Mn1/3O2 cathode up to a cutoff charge voltage of 4.6 V in lithium cells. The better electrochemical performance of the lithium excess cathode is attributed to a smaller volume change occurring during the discharge-charge cycling and a consequent suppression of lattice strain and impedance growth. (C) 2004 The Electrochemical Society.

引用

页码：A365 / A368

页数：4

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