Effects of chromium doping on performance of LiNi_(0.5)Mn_(1.5)O_4 cathode material  

掺铬对LiNi_(0.5)Mn_(1.5)O_4正极材料性能的影响(英文)

作　　者：王巍[1] 刘恒[1] 王燕[2] 高超[1] 张军[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610065 [2]西南民族大学计算机科学与技术学院,成都610041

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第7期2066-2070,共5页中国有色金属学报（英文版）

基　　金：Project(2007BA201055)supported by the National Science and Technology Support Program,China

摘　　要：In order to improve the cycle and rate performance of LiNi0.5Mn1.5O4, LiCr2 Ni0.5 Mn1.5 O （0≤Y≤0.15） particles were Y -Y -Y 4 synthesized by the sucrose-aided combustion method. The effects of Cr doping in LiNi0.5Mn1.5O4 on the structures and electrochemical properties were investigated. The samples were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, cyclic voltammetry （CV）, galvanostatic charge-discharge test and electrochemical impedance spectrum （EIS）. The results indicate that the LiCr2 Ni0.5 Mn1.5 O possess a spinel structure and small particle size, and LiCr0.2Ni0.4Mn1.4O4exhibits Y -Y -Y 4 the best cyclic and rate performance. It can deliver discharge capacities of 143 and 104 mA·h/g at 1C and 10C, respectively, with good capacity retention of 96.5% at 1C after 50 cycles.为了改善LiNi0.5Mn1.5O4材料的循环和倍率性能,以蔗糖为助燃剂合成LiCr2Ni0.5Mn1.5O(0≤Y≤0.15)Y-Y-Y4颗粒,并研究掺铬对LiNi0.5Mn1.5O4结构和电化学性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)、恒电流充放电测试和交流阻抗谱(EIS)对样品进行表征。结果表明,所制备材料呈现尖晶石结构并具有小颗粒尺寸,LiCr0.2Ni0.4Mn1.4O4表现出最佳的循环和倍率性能,在1C和10C倍率下的放电比容量分别为143和104mA·h/g,并且在1C倍率下循环50次后仍具有96.5%的容量保持率。

关 键 词：lithium ion batteries cathode material SPINEL Cr doping lithium nickel manganese oxide 

分 类 号：TM912[电气工程—电力电子与电力传动]