反应温度对LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2组织结构及电化学性能的影响  

Influence of Reaction Temperature on Organizational Structure and Electrochemical Performance of LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2

作　　者：张林[1] 罗飞[1] 郭玉忠[1] 杨俊淼 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650031

出　　处：《昆明理工大学学报（自然科学版）》2014年第3期12-15,共4页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金联合项目(U1202272);国家自然科学基金项目(20363002);云南省科技攻关项目(2009GG02)

摘　　要：在共沉淀法合成Ni0.4Co0.2Mn0.4(OH)2的基础上制备了锂离子电池正极材料LiNi0.4Co0.2Mn0.4O2.通过XRD,SEM和电化学测试对不同反应温度下LiNi0.4Co0.2Mn0.4O2正极材料的结构、形貌及电化学性能进行了测试和表征.测试表明随着反应温度的提高,c/a和I(003)/I(104)值也在增加,表明温度的升高可以减少锂镍离子的混排,使层状结构更加完整,进而电化学性能也更优异.900℃下反应所得到的样品,以0.2C放电,其首次放电容量为148.3mAh/g,库伦效率最高可达9.8%.循环40个周期后容量保持率为93.9%,具有较好的电化学性能.LiNi0.4Co0.2Mn0.4O2,the cathode material for lithium ion battery,is prepared from the precursor,Ni0.4 Co0.2 Mn0.4 （OH）2 which is synthesized by the chemical co-precipitation method.X-ray diffraction（XRD）,scanning electron microscopy （SEM） and electrochemical tests are used to characterize the structure,appearance and electrochemical performances of Li LiNi0.4Co0.2Mn0.4O2.The results show that the value of c/a and I（003）/I（104）is increasing with reaction temperature,which suggests that the temperature increase can reduce Ni /Li cation mixing, form an integrated layed structure and ensure a better electrochemical performance.When the reaction temperature is 900℃,the synthesized material has the best electrochemical performance.Electrochemical tests show that the initial discharge capacity is 148.3mA·h/g and that the capacity retention rate is 93.9%after 40 cycles.

关 键 词：锂离子电池 正极材料 LiNi0.4Co0.2Mn0.4O2 反应温度 

分 类 号：TM912.9[电气工程—电力电子与电力传动]