Influence of Co substitution for Ni and Mn on the structural and electrochemical characteristics of LiNi0.5Mn1.5O4

被引：81

作者：

Ito, Atsushi ^{[1
]}

Li, Decheng ^{[2
]}

Lee, Yunsung ^{[3
]}

Kobayakawa, Koichi ^{[1
]}

Sato, Yuichi ^{[1
]}

机构：

[1] Kanagawa Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan

[2] Kanagawa Univ, High Tech Res Ctr, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan

[3] Chonnam Natl Univ, Fac Appl Chem Engn, Kwangju 500757, South Korea

来源：

JOURNAL OF POWER SOURCES | 2008年 / 185卷 / 02期

关键词：

Li-ion battery; Cathode material; LiNi0.5-xCo2xMn1.5-xO4; Lithium chemical diffusion coefficient; Area specific impedance; Structural and electrochemical properties;

D O I：

10.1016/j.jpowsour.2008.08.087

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：

LiNi0.5-xCo2xMn1.5-xO4 (0 <= 2x <= 0.2) was prepared by spray drying, then re-annealing in O-2. Their structural and electrochemical properties were studied by ex-situ XRD, GITT. and charge-discharge testing. The substitution of cobalt for Ni and Mn in the LiNi0.5Mn1.5O4 resulted in significant structural and electrochemical variations, such as the change in structural transformation with lithium extraction. the increase in the lithium diffusion coefficient and the decrease in the area specific impedance. Moreover, the improved kinetic properties caused by the Co substitution for Ni and Mn result in an improved cyclic performance at a high rate and at elevated temperature as well as the rate capability. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1429 / 1433

页数：5

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