Structure and electrochemical characteristics of LiMn0.7M0.3O2 (M = Ti, V, Zn, Mo, Co, Mg, Cr)

被引：26
|
作者：
Guo, ZP [1 ]
Zhong, S [1 ]
Wang, GX [1 ]
Liu, HK [1 ]
Dou, SX [1 ]
机构：
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2003年 / 348卷 / 1-2期
关键词：
energy storage materials; electrode materials; chemical synthesis; electrochemical reactions; X-ray diffraction;
D O I：
10.1016/S0925-8388(02)00805-8
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 series of compounds LiMn0.7M0.3O2 (M=Ti,V, Zn, Mg, Mo, Co, Cr) with different doping elements were synthesized. It was found that the ionic size of the doping elements is not a discriminating factor in the structure of LiMn0.7M0.3O2 compounds. The LiMn0.7M0.3O2 (M=Cr, Zn, Mg,V) forms in the hexagonal structure, while the LiMn0.7M0.3O2 (M=Co, Ti, Mo) shows an orthorhombic structure. The LiMn0.7M0.3O2 compounds have less crystal distortion compared with o(orthorhombic)-LiMnO2. All substituted materials cycled between 4.4 and 2 V in Li cells show higher stability of capacity compared with the standard o-LiMnO2. AC impedance analysis results show that the charge transfer process and lithium ion diffusion process for doped LiMnO2 compounds are better than that for un-substituted compounds. (C) 2002 Elsevier Science B.V. All rights reserved.
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收藏
页码：231 / 235
页数：5
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