AlF_3包覆对Li_(1.17)Mn_(0.53)Ni_(0.2)Co_(0.1)O_2正极材料电化学性能的影响  

Effect of AlF_3 coating on the Electrochemical Performance of Li_(1.17)Mn_(0.53)Ni_(0.2)Co_(0.1)O_2 Cathode Materials

作　　者：唐淼[1,2] 师春生 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]天津巴莫科技股份有限公司,天津300384

出　　处：《南开大学学报（自然科学版）》2015年第3期59-64,共6页Acta Scientiarum Naturalium Universitatis Nankaiensis

摘　　要：采用控制结晶法制备富锂锰基固溶体正极材料Li1.17Mn0.53Ni0.2Co0.1O2,并采用AlF3对其进行包覆,通过XRD、SEM、TEM和电池充放电测试研究了AlF3包覆量对材料结构和电化学性能的影响.TEM观察表明,在颗粒表面形成一层10~20nm厚的AlF3包覆层.电化学性能测试表明,AlF3包覆可有效改善材料的循环性能,提高材料的放电比容量和库仑效率.当包覆量为1%时,样品具有最优异的电化学性能,在0.05℃下的首次放电比容量由未包覆时的228mAh/g提升至274mAh/g,库仑效率高达86.7%;在0.5℃下经50次循环后容量保持率为93%.Li1.17Mn0.53Ni0.2Co0.1O2 cathode material was prepared by a controlled crystallization method.The material was then coated by AlF3.Influence of the amount of AlF3 on the structure and electrochemical properties of cathode material was investigated by X-ray diffraction（XRD）,scanning electron microscope（SEM）,transmission electron microscope（TEM）and electrochemical performance tests.TEM characterization proved that the particles were coated by a 10-20 nm thick coating layer.The cycle performance,discharge capacity and coulomb efficiency of the AlF3 coated sample were improved significantly,and the 1% AlF3 coated material showed the best electrochemical performance.The initial discharge capacity was improved from 228mAh/g（uncoated）to 274mAh/g at 0.05 C,and the coulomb efficiency was 86.7%;the specific capacity retention was 93%after 50 cycles at 0.5C.

关 键 词：锂离子电池 AlF3包覆 Li1.17Mn0.53Ni0.2Co0.1O2 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]