微量CNTs包覆对LiNi0.8Co0.1Mn0.1O2正极材料电化学性能的影响  

Effect of micro carbon nanotubes coating onelectrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material

作　　者：张淑娴 邓凌峰[1,2,3] 连晓辉 谭洁慧 李金磊 ZHANG Shu-xian;DENG Ling-feng;LIAN Xiao-hui;TAN Jie-hui;LI Jin-lei(School of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Province Key Laboratory of Materials Surface andInterface Science and Technology,Central South Universityof Forestry and Technology,Changsha 410004,China;Hunan Xineng New Material Co.,Ltd.,Changsha 410205,China)

机构地区：[1]中南林业科技大学材料科学与工程学院,长沙410004 [2]中南林业科技大学材料表界面科学与技术湖南省重点实验室,长沙410004 [3]湖南烯能新材料有限公司,长沙410205

出　　处：《材料工程》2020年第5期68-74,共7页Journal of Materials Engineering

基　　金：国家自然科学基金重点资助项目(31530009)。

摘　　要：利用高温固相法制备LiNi0.8Co0.1Mn0.1O2正极材料,通过混酸处理和离心过滤CNTs以得到单壁碳纳米管(SWCNTs),再添加分散剂二甲基甲酰胺(DMF)后与LiNi0.8Co0.1Mn0.1O2混合,利用超声分散与喷雾干燥法将不同量的CNTs均匀包覆在LiNi0.8Co0.1Mn0.1O2正极材料的表面。CNTs/LiNi0.8Co0.1Mn0.1O2复合材料通过SEM、XRD以及电化学测试系统进行表征和测试。结果表明CNTs包覆量为0.5%(质量分数)的CNTs/LiNi0.8Co0.1Mn0.1O2复合材料性能最佳。在0.1,5C下的首次放电比容量分别为215.59,175.78mAh·g^-1。在0.1C下充电、大倍率5C下放电,CNTs/LiNi0.8Co0.1Mn0.1O2复合材料仍能保持首次放电容量的81.54%,比纯的LiNi0.8Co0.1Mn0.1O2提高了10.48%。在1C倍率下循环100次其容量保持率可达93.02%,比纯的LiNi0.8Co0.1Mn0.1O2提升了15.42%。High nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2 was prepared by high temperature sintering method,and the carbon nanotubes were treated in mixed acid.The single wall carbon nanotubes were obtained by centrifuging.Then dispersant(DMF)and LiNi0.8Co0.1Mn0.1O2 were mixed,and different amounts of carbon nanotubes were coated on the surface of LiNi0.8Co0.1Mn0.1O2 by ultrasonic dispersion and spray drying method uniformly.CNTs/LiNi0.8Co0.1Mn0.1O2 composites were characterized and tested by SEM,XRD and electrochemical test system.The results show that the composite with 0.5%(mass fraction)carbon nanotubes has the best morphology and the best electrochemical performance.The first discharge specific capacities at different rates such as 0.1 C and 5 C are 215.587 mAh·g-1 and 175.78 mAh·g^-1,respectively.When charged at 0.1 C and discharged at a large rate of 5 C,the CNTs/LiNi0.8Co0.1Mn0.1O2 composites can still maintain the first discharge capacity of 81.54%,which is 10.48%higher than that of LiNi0.8Co0.1Mn0.1O2 which is not coated with carbon nanotubes.After 100 cycles at 1 C,the capacity retention rate is 93.02%,which is 15.42%higher than that of LiNi0.8Co0.1Mn0.1O2 which is not coated with carbon nanotubes.

关 键 词：碳纳米管 LiNi0.8Co0.1Mn0.1O2 微量包覆 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]