锂离子电池正极材料LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2在不同电解液中的性能研究  

Electrochemical Characterization of Positive Electrode Material LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 in Different Electrolytes

作　　者：刘静静[1] 仇卫华[1] 于凌燕[1] 赵海雷[1] 李涛[1] 

机构地区：[1]北京科技大学材料科学与工程学院无机非金属材料系,北京100083

出　　处：《电化学》2006年第4期373-377,共5页Journal of Electrochemistry

基　　金：国家自然科学基金(50472093)资助

摘　　要：应用低热固相合成法制备锂离子电池正极材料L iCo1/3N i1/3Mn1/3O2.研究该材料的结构与形貌,并比较它在商品L iPF6盐和在实验室合成的L iBOB(L iB(C2O4)2)盐电解液中的电化学性能.在L iPF6/EC+DMC+DEC电解液中,该材料表现出优良的电化学性能,其于0.5C、1C、1.5C、2C、3C放电倍率的初始比容量依次为167、163、163、157、147mAh/g,电池的循环性能也较好,说明低热固相合成的材料的有较好的高倍率性能.在L iBOB/EC+DEC+DE电解液中,0.5C倍率下比容量为160 mAh/g,较之L iPF6盐电解液的相差不大,但在高倍率下的比容量有所下降.Cathode materials LiNi1/3Co1/3Mn1/3O2 were prepared by low-heating solid-state reaction. The micro-structure and morphology of as-synthesized materials have been investigated by using XRD and SEM. The compatibilities of LiNi1/3Co1/3Mn1/3O2 with purchased LiPF6/EC ＋ DMC ＋ DEC electrolyte and prepared LiBOB/ EC ＋ DEC ＋ EMC electrolyte have also been studied. The LiNi1/3Co1/3Mn1/3O2 batteries showed excellent electrochemical properties in the LiPF6/EC ＋ DMC ＋ DEC electrolyte. Reversible discharge capacities of 167, 163,163,157,147mAh/g at 0.5C,1C,1.5C,2C,3C rate between 2.7 - 4.35 V, with stable cycling performances have been obtained. Comparatively,the specific capacity of 160 mAh/g at O. 5C was obtained in LiBOB/ EC ＋ DEC ＋ DEC electrolyte,which was just a little lower than that in the other electrolyte. However, the high rate capability of the materials in LiBOB/EC ＋ DEC ＋ DEC was not as good as that in LiPF6/EC ＋ DMC ＋ DEC, which needs to be improved in further studies.

关 键 词：锂离子电池 正极材料 LINI1/3CO1/3MN1/3O2 电解液 

分 类 号：TM912[电气工程—电力电子与电力传动]