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.

引用

页码：231 / 235

页数：5

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