锂离子电池正极材料LiMn_(0.5)Ni_(0.5-x)Co_xO_2的制备及电化学性能  

Preparation and electrochemical performance of LiMn_(0.5)Ni_(0.5-x)Co_xO_2 anode material for lithium-ion battery

作　　者：王秋红[1] 李建刚[1,2] 王丽媛[1] 姚琼[2] 刘才[1,2] 何向明[3] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]北京石油化工学院应用化学系,北京102617 [3]清华大学核能与新能源技术研究院,北京100084

出　　处：《化工新型材料》2017年第2期123-125,129,共4页New Chemical Materials

摘　　要：以氢氧化物共沉淀法合成前驱体,氢氧化锂为锂源,通过高温煅烧合成了锂离子电池正极材料LiMn_(0.5)Ni_(0.5-x)Co_xO_2(x=0、0.1、0.2)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、恒电流充放电测试、循环伏安法(CV)及电化学交流阻抗谱(EIS)技术对制备条件和钴掺杂量进行了研究。结果表明,所制材料均具有良好的α-NaFeO_2层状结构;当pH=10.5,煅烧温度为850℃,x=0.1时,所制备LiMn_(0.5)Ni_(0.4)Co_(0.1)O_2材料0.2C放电容量达155mAh/g,5C放电容量仍达110mAh/g,0.2C倍率下循环50次后的容量保持率达98%。The anode materials of LiMn（0.5）Ni（0.5-x）CoxO2（x=0,0.1,0.2）for lithium-ion battery was prepared by hydroxide co-precipitation method.X-ray diffraction（XRD）,scanning electron microscope（SEM）,charge-discharge test,cyclic voltammetry（CV）and electrochemical impedance spectra（EIS）were used to explore the effect of preparation conditions and doped cobalt ion content.The results indicated that all of as-prepared materials exhibitedα-NaFeO2 layered structure.The best electrochemical performance of LiMn（0.5）Ni（0.5-x）CoxO2 can be obtained under the conditions of pH=10.5,850℃and the doped cobalt ion content x=0.1.It showed a capacity of 155mAh/g at 0.2C,110mAh/g at 0.5Cand capacity retention of 98% after 50 cycling.

关 键 词：锂离子电池 正极材料 氢氧化物共沉淀法 层状结构 

分 类 号：TM912[电气工程—电力电子与电力传动]