不同制备方法对正极材料0.5Li_2MnO_3·0.5Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_2结构、形貌、电化学性能的影响  

Influences of Different Preparation Methods on Structure,Morphology and Electrochemical Performance of 0. 5Li_2MnO_3·0.5Li( Ni_(1 /3)Co_(1 /3)Mn_(1/3))O_2 Cathode Material

作　　者：程磊[1] 王志兴[1] 贺振江[1] 李新海[1] 郭华军[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《矿冶工程》2014年第6期123-127,共5页Mining and Metallurgical Engineering

基　　金：湖南省科技重大专项计划(2011FJ1005)

摘　　要：分别采用氢氧化物共沉淀、碳酸盐共沉淀、喷雾干燥的方法合成了层状α-Na Fe O2结构的富锂正极材料0.5Li2Mn O3·0.5Li(Ni1/3Co1/3Mn1/3)O2,通过X射线衍射分析(XRD)、扫描电子显微镜(SEM)和电化学性能测试对不同合成方法所得的样品进行了表征。实验结果表明:氢氧化物共沉淀合成的前驱体所制备的正极材料0.5Li2Mn O3·0.5Li(Ni1/3Co1/3Mn1/3)O2具有良好的电化学性能,0.05C倍率下首次放电容量可达247.1 m A·h/g,0.2C倍率条件下经过50次循环,容量保持率为98.7%。Layered Li-rich cathode material 0.5Li2MnO3 · 0.5Li （Ni1/3CO1/3Mn1/3）O2 with α-NaFeO/structure has been prepared by hydroxide co-precipitation, carbonate co-precipitation and spray drying methods respectively. The samples obtained by three methods were characterized by X-ray diffraction, scanning electron microscope and electrochemical characteristics analyses. The results show that the cathode material 0.5Li2MnO3 · 0.5Li （Ni1/3CO1/3 Mn1/3 ）O2 synthesized by the hydroxide co-precipitation method presents excellent electrochemical performance, with the initial discharge capacity of 247.1 mA · h/g at 0.05C and the capacity retention of 98.7% after 50 cycles at 0.2C.

关 键 词：锂离子电池 正极材料 0.5Li2MnO3·0.5Li(Ni1/3Co1/3Mn1/3)O2 共沉淀 电化学性能 喷雾干燥 

分 类 号：TM912[电气工程—电力电子与电力传动]