多离子共掺杂对三元正极材料性能的影响  

Effect of multi-ion co-doping on performances of LiNi1/3Co1/3Mn1/3O2 cathode material for lithium ion batteries

作　　者：翁雅青[1,2] 王爽 胡银[1] 晏南富[1] 曹才放[2] WENG Ya-qing;WANG Shuang;HU Yin;YAN Nan-fu;CAO Cai-fang(Institute of Applied Chemistrty,Jiangxi Academy of Sciences,Nanchang Jiangxi 330096,China;School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China)

机构地区：[1]江西省科学院应用化学研究所,江西南昌330096 [2]江西理工大学冶金与化学工程学院,江西赣州341000

出　　处：《电源技术》2020年第4期477-481,共5页Chinese Journal of Power Sources

基　　金：国家自然科学青年科学基金项目(51604129);江西省科技厅工业领域一般项目(20151BBE50107)。

摘　　要：三元正极材料有望成为新能源汽车动力电池首选材料,为改善三元材料性能,采用氢氧化物共沉淀-固相合成工艺制备出一系列正极材料Li[(Ni1/3Co1/3Mn1/3)1-x-y-zM1xM2yM3z]O2(0≤x≤0.05、0≤y≤0.05、0≤z≤0.05;M1=Al、M2=Mg、M3=Cu)并与市售三元材料进行对比。XRD、SEM以及电化学测试结果表明:制得的材料均为α-NaFe02层状结构,其中三元材料LiNi1/3Co1/3Mn1/3O2为类球状形貌,比市售三元颗粒细小,在1 C、2.7~4.3 V下循环50周,保持率为91.56%,在0.1 C、2.7~4.3 V下循环100周,保持率高达92.46%,和商用材料相比,容量值和循环性能相当,倍率性能不佳。此外,本研究还分析了两种及三种掺杂元素同时存在对正极材料的影响:掺杂后材料粒度变小,当掺杂含量为0.05时,高含量的掺杂离子损害了电池性能;当掺杂含量为0.01时,材料Li[(Ni1/3Co1/3Mn1/3)0.97Al0.01Mg0.01Cu0.01]O2的倍率性能明显提高,2 C和5 C倍率下的放电比容量分别为112和98.6 mAh/g。The ternary cathode material is expected to be the alternative choice for electric vehicle power batteries.A series materials Li[(Ni1/3Co1/3Mn1/3)1-x-y-zM1xM2yM3z]O2(0≤x≤0.05,O≤y≤0.05,0≤z≤0.05;M1=AI、M2=Mg、M3=Cu)were synthesized via a co-precipitation and solid state reaction whose properties were compared with commercially available ternary materials as well.XRD,SEM and electrochemical test results show that all materials exhibit a-NaFeO2 layered structure with particle size smaller than commercially materials.When the pristine sample cycled at 1 C between 2.7 and 4.3 V over 50 weeks,the retention rate reaches 91.56%,while cycled at 0.1 C between 2.7 and 4.3 V over 100 weeks,the rate is as high as 92.46%.Capacity value and cycling performance of commercial materials are similar to bare sample prepared in this paper but with much better rate capability.In addition,the effects of binary as well as ternary doping on the characteristics and performances were investigated.While doping content is set at 0.05,the high content doping has negative effect;while doping content is 0.01,the rate performance of Li[(Ni1/3Co1/3Mn1/3)0.97Al0.01Mg0.01Cu0.01]O2 is improved with a specific capacity of 112 and 98.6 mAh/g at 2 C and 5 C,respectively.

关 键 词：动力电池 三元正极材料 掺杂改性 多离子共掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]