嵌锂正极材料LixMn_3-xO₄和LiFeO₂的制备和物性研究  

Synthesis and Study on Physical Properties of Li-Inserted Cathode Materials LixMn3-xO4 and LiFeO2

作　　者：马彤 杨淑敏[1] 王立勇[1] 岂云开[1] 顾建军[1] 

机构地区：[1]河北民族师范学院物理与电子工程学院,河北承德

出　　处：《现代物理》2016年第4期83-91,共9页Modern Physics

基　　金：河北省自然科学基金(A2012101001);河北省承德市财政局项目(CZ2012007,CZ2013002)资助。

摘　　要：本文采用溶胶凝胶法制备了LixMn3-xO4(X = 0.7, 1.0, 1.2, 1.4, 1.6)和LiFeO2锂离子电池正极材料,并对其结构、磁性、电化学性能进行了研究。实验发现,LixMn3-xO4系列样品呈现尖晶石结构,室温下显示顺磁特性,x = 1.2的样品首次充放电容量分别为58.16 mA h/g和29.47 mA h/g,LiFeO2样品为α-NaFeO2型铁氧体结构,空间群为Fm3m,室温下呈现软磁特性,首次充放电容量为80.95 mA h/g和38.50 mA h/g。本文详细的分析了系列样品的结构、磁性与电化学性能之间的关系,为提高嵌锂正极材料容量、稳定性以及充放电能力等性能提供了实验依据。In this work, lithium ion battery cathode material LixMn3-xO4(X = 0.7, 1.0, 1.2, 1.4, 1.6) and LiFeO2 were synthesized by a sol-gel method. At the same time, the structure, magnetism and electro-chemical performance of samples were studied. The results showed that LixMn3-xO4 were spinel structure and showed paramagnetic properties at room temperature. The initial charge-discharge capacities of sample with x = 1.2 were 58.16 mA?h/g and 29.47 mA?h/g. LiFeO2 sample with space group Fm3m exhibited a α-NaFeO2 ferrites structure, show soft magnetic properties at room temperature. The initial charge-discharge capacities of LiFeO2 sample were 80.95 mA?h/g and 38.50 mA?h/g. The relationship between the structure, the magnetism and electrochemical performance of series samples was analyzed deeply, which provided experimental basis for improving the capacity, stability and charge-discharge capacity properties of lithium cathode material.

关 键 词：锂离子电池 正极材料 电化学性能 

分 类 号：TM9[电气工程—电力电子与电力传动]