Synthesis and Electrochemical Performance of Li2Mn1-xMgxSiO4 Cathode Materials for Li-ion Battery

被引：0

作者：

Luo Shaohua ^{[1
]}

Li Si ^{[1
]}

Wang Ming ^{[1
]}

机构：

[1] Northeastern Univ, Qinhuangdao Branch, Dept Mat Sci & Engn, Qinhuangdao 066004, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2012年 / 41卷

关键词：

Li-ion batteries; cathode material; Li2MnSiO4; magnesium ion doping;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A kind of doped-type cathode materials of Li2Mn1-xMgxSiO4 for Li-ion batteries has been prepared by solid-state calcination method in nitrogen. The samples were characterized by TG-DTA, XRD, SEM and electrochemical performance measurement. The TG-DTA curves and XRD patterns of precursor show that the Li2MnSiO4 can be obtained at 750 degrees C. The XRD patterns indicate that the Li2MnSiO4 crystallized in an orthorhombic structure with a space group of Pmn2(1). The XRD patterns of doped samples indicate that the crystallinity of Li2MnSiO4 is improved. Doped-Mg markedly affects the microscopic morphology of samples. The uniform particle size and little agglomerated sub-micron powder can be obtained by proper doping quantity. The electrochemical test demonstrates that the Li2Mn0.98Mg0.02SiO4 shows the best electrochemical performance with an initial discharge capacity of 124.6 mAh.g(-1), 38% of the theoretical capacity, and retains a discharge capacity of 60 mAh.g(-1) after 20 cycles.

引用

页码：118 / 122

页数：5