合成温度对正极材料LiNi_(0.66)Co_(0.34)O_2结构和电化学性能的影响  

Effect of synthesis temperature on microstructure and electrochemical performance of LiNi_(0.66)Co_(0.34)O_2

作　　者：肖文豪[1] 章梦琴 王琛[1] 艾延龄[1,2] XIAO Wenhao;ZHANG Mengqin;WANG Chen;AI Yanling(School of Materials Science and Engineering, Central South University, Changsha 410083, China;Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education,Central South University, Changsha 410083, China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《电子元件与材料》2017年第6期53-57,共5页Electronic Components And Materials

基　　金：长沙市科技计划资助项目(No.K1005011-11)

摘　　要：在空气中通过固相烧结合成LiNi_(0.66)Co_(0.34)O_2锂离子正极材料,利用XRD,SEM,TEM以及恒流充放电测试等手段,探究了合成温度对正极材料的晶体结构和电性能的影响。不同温度下制备的镍钴酸锂,具有相同的菱面体点阵结构,空间群是R-3m。750℃合成制备的LiNi_(0.66)Co_(0.34)O_2,结晶较完全,层状结构较好,样品颗粒大小均匀。其组装电池首次放电比容量为155 m Ah/g,5次充放电后表现出较好的循环性能。LiNi0.66Co0.34O2lithium-ion battery anode materials were synthesized by solid state reaction in air condition,and the influence of synthesis temperature on the crystal structure and electrochemical performance of synthetic material was characterized by XRD,SEM,TEM and charge-discharge studies.The lithium nickel cobalt oxides prepared under different temperatures all have the rhombohedron lattice structure(space group is R-3m).The LiNi0.66Co0.34O2synthesized at750℃has a good crystallinity,better layered structure and more uniform particle size.The initial discharge specific capacity of the750℃prepared sample is155mAh/g,and shows excellent cycle performance after five charge-discharge cycles.

关 键 词：LiNi0.66Co0.34O2 镍钴酸锂 正极材料 锂离子电池 微观结构 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]