掺杂Fe^(3+)对高电压正极材料LiNi_(0.5)Mn_(1.5)O_4结构和性能的影响  

Effects of Fe^(3+) Doping on the Structure and Electrochemical Properties of High-voltage Cathode LiNi_(0.5)Mn_(1.5)O_4

作　　者：白钢印 王英[2,3] 肖志平[2,3] 唐仁衡[2,3] 丁恒敏[1] 肖方明[2,3] 

机构地区：[1]昆明理工大学材料学院,昆明650093 [2]广东省稀土开发及应用重点实验室,广州510650 [3]广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州510650

出　　处：《材料导报》2015年第12期15-18,共4页Materials Reports

基　　金：珠海市战略性新兴产业重大项目;珠海市产学研合作专项(2011A05101003);广东省科技厅计划项目(2009A060800011)

摘　　要：以Li2CO3、MnO2、NiO、FeC2O4·2H2O为原料,用高温固相法合成了尖晶石结构的LiNi0.5Mn1.5O4/LiNi0.5Mn1.45Fe0.05O4锂离子电池正极材料;并对合成的样品进行XRD、SEM及电化学性能测试。结果表明:引入Fe3+可以提高材料的结构稳定性,并且改善了材料的导电性,一定程度上减缓材料的容量衰减,LiNi0.5Mn1.45Fe0.05O4表现出较好的电化学性能,0.2C倍率下经20次充放电循环,未掺杂样品与掺杂样品的放电比容量分别为115.4mAh/g和120.1mAh/g,容量保持率由92.1%提高到96.5%。Li-ion battery cathode materials LiNi0.5 Mn1 .5 O4/LiNi0.5 Mn1 .45 Fe0.05 O4 were synthesized by high temperature solid-phase method,while Li2 CO3 ,MnO2 ,NiO and FeC2 O4 ·2 H 2 O was used as raw materials.The syn-thesized samples were tested by XRD,SEM and electrochemical measurement.Results showed：LiNi0.5 Mn1 .45 Fe0.05 O4 exhibited better electrochemical performance.When Fe doping is applied on LiNi0.5 Mn1 .5 O4 ,not only was the stability of electrode structure improved,but also its electric conductivity and cycle performance were excellent.After 20 charge-discharge cycles（at 0.2C rates）,the discharge capacity of LiNi0.5 Mn1 .5 O4 was 1 1 5.4 mAh/g,while the LiNi0.5-Mn1 .45 Fe0.05 O4 was 120.1 mAh/g,with a capacity retain ratio from 92.1% to 96.5%.

关 键 词：锂离子电池 高电压正极材料 固相法 FE 掺杂 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]