锂离子电池富锂正极材料Li[Ni_xLi_(1/3-2x/3)Mn_(2/3-x/3)]O_2(x=1/5,1/4,1/3)的合成及电化学性能  

Synthesis and Electrochemical Behavior of Li-rich Cathode Materials Li[Ni_xLi_(1/3-2x/3)Mn_(2/3-x/3)]O_2(x=1/5,1/4,1/3) in the Lithium-ion Battery

作　　者：王绥军[1] 赵煜娟[1] 赵春松[1] 夏定国[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《高等学校化学学报》2009年第12期2358-2362,共5页Chemical Journal of Chinese Universities

基　　金：北京市自然科学基金(批准号:2093031)资助

摘　　要：通过共沉淀法制备了M(OH)2(M=Mn,Ni)前驱体,并与LiOH混合,合成了锂离子电池富锂正极材料Li[NixLi1/3-2x/3Mn2/3-x/3]O2,采用XRD、SEM和充放电实验对其进行表征.研究结果表明,Li,Ni,Mn原子在M层中呈有序分布,形成超结构;富锂正极材料由亚微米的一次粒子团聚组成1～3μm颗粒;在2.0～4.8V电位范围内,充放电电流密度为10mA/g时,富锂正极材料表现出很高的可逆比容量,达到200～240mA.h/g,同时具有良好的循环可逆性能.The Li-rich cathode materials Li[NixLi1/3-2x/3Mn2/3-x/3]O2（x=1/5, 1/4, 1/3） were synthesized with co-precipitated metal hydroxide precursors M（OH）2（M=Mn, Ni）. The results of X-ray diffraction（XRD） and selected area electron diffraction（SAED） analysis confirmed the Li, Ni and Mn atoms are ordered in the M layer to form the superstrucutre. Images of scanning electron microscopy（SEM） show the Li-rich materials particles are about 1—3 μm, aggregated of submicron grains. Electrochemical behavior was examined by charge-discharge cycling. The Li[NixLi1/3-2x/3Mn2/3-x/3]O2（x=1/5, 1/4, 1/3） materials exhibited high reversible capacity of 200—240 mA·h/g and excellent cycle performance between 2.0 and 4.8 V at 10 mA/g current density.

关 键 词：锂离子电池 富锂正极材料 层状结构 电化学性能 

分 类 号：O614[理学—无机化学]