Effects of Al substitution for Ni and Mn on the electrochemical properties of LiNi0.5Mn1.5O4

被引：145

作者：

Zhong, G. B. ^{[1
]}

Wang, Y. Y. ^{[1
]}

Zhang, Z. C. ^{[1
]}

Chen, C. H. ^{[1
]}

机构：

[1] Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Dept Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 18期

基金：

美国国家科学基金会;

关键词：

Lithium-ion batteries; Spinel; Al doping; Lithium nickel manganese oxide; Thermopolymerization; SPINEL CATHODE LIMN1.5NI0.5O4; LITHIUM SECONDARY BATTERIES; HIGH-VOLTAGE; ELEVATED-TEMPERATURES; POSITIVE-ELECTRODE; ION BATTERIES; PERFORMANCE; CELLS; LIMN2O4; CR;

D O I：

10.1016/j.electacta.2011.03.093

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The effects of Al substitution for Ni or (and) Mn in LiNi0.5Mn1.5O4 spinel on the structures and electrochemical properties are investigated. Powders of LiNi0.5Mn1.5O4, Li0.95Ni0.45Mn1.5Al0.05O4, LiNi0.475 Mn1.475Al0.05O4 and Li1.05Ni0.5Mn1.45Al0.05O4 are synthesized by a thermopolymerization method. Their structures and electrochemical properties are studied by X-ray powder diffraction, scanning electron microscopy, infrared spectroscopy, cyclic voltammetry and galvanostatic charge-discharge testing. The introduction of Al in these LiNi0.5Mn1.5O4 samples has resulted in structure variation, and greatly improved their cyclic performance and rate capability. The effects of Al substitutions for Ni and Mn in the LiNi0.5Mn1.5O4 are different. Compared with LiNi0.5Mn1.5O4, Li0.95Ni0.45Mn1.5Al0.05O4 demonstrates higher specific capacity at room temperature but faster capacity fading at elevated temperatures. Li1.05Ni0.5Mn1.45Al0.05O4 displays a lower discharge capacity but better capacity retention at 55 degrees C. Moreover, the cyclic performance and rate capability of the Ni-substituted Li0.95Ni0.45Mn1.5Al0.05O4, Ni/Mn co-substituted LiNi0.475Mn1.475Al0.05O4 and Mn-substituted Li1.05Ni0.5Mn1.45Al0.05O4 at room temperature are similar, and have improved substantially compared with the Al-free LiNi0.5Mn1.5O4 sample. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：6554 / 6561

页数：8

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