正极材料LiCu_xMn_(2-x)O_(4-x)Br_x的合成及电化学性能  

Synthesis and Electrochemical Properties of Cathod Material LiCu_xMn_(2-x)O_(4-x)Br_x

作　　者：李荣华[1] 李敏[1] 

机构地区：[1]福州大学化学系,福建福州350002

出　　处：《化学研究》2008年第4期81-84,共4页Chemical Research

基　　金：福建省科技三项资助项目(K04012);福建省自然科学基金计划资助项目(U0750008)

摘　　要：通过溶胶-凝胶法制备了锂锰氧化物LiCuxMn2-xO4-xBrx正极材料,采用XRD、SEM等方法对其进行了表征,并测试了样品的电化学性能.结果表明:合成的LiCuxMn2-xO4-xBrx样品为尖晶石结构,粒径均匀.随着掺杂量的增加,晶胞参数减小;一定量的Cu2+和Br-复合改性增加了尖晶石结构的稳定性,改善了材料的循环性能.实验发现当掺杂量为x=0.03时循环性能最好,初始比容量为97.5mAh/g,50次循环后比容量为82.1mAh/g.The modified spinel lithium-manganese oxide LiCuxMn2-xO4-xBrx as cathode material for battery was synthesized by sol-gel method. The crystal structure and electrochemical performance of the samples were studied by XRD, SEM and charge-discharge tests. Results showed that the samples of LiCuxMn2-xO4-xBrx were still the cubic spinel, and the grain distribution was uniform. With the content of Cu and Br increasing, the lattice parameters decreased; the stability of spinel structure and cycle performance were improved by a content of Cu^2＋ and Br^-. The cycle performance was best when x = 0.03, its initial capacity was 97.5 mAh/g, and after 50 cycles, the specific discharge capacity was 82.1 mAh/g.

关 键 词：锂离子电池 正极材料 尖晶石 LIMN2O4 复合改性 

分 类 号：TM911[电气工程—电力电子与电力传动]