Effect of micro carbon nanotubes coating on electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material
ZHANG Shu-xian1,2, DENG Ling-feng1,2,3, LIAN Xiao-hui1,2, TAN Jie-hui1,2, LI Jin-lei1,2
1. School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
2. Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China;
3. Hunan Xineng New Material Co., Ltd., Changsha 410205, China
Abstract：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 LiNi0.8Co0.1Mn0.1O2by 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-1and 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.
张淑娴, 邓凌峰, 连晓辉, 谭洁慧, 李金磊. 微量CNTs包覆对LiNi0.8Co0.1Mn0.1O2正极材料电化学性能的影响[J]. 材料工程, 2020, 48(5): 68-74.
ZHANG Shu-xian, DENG Ling-feng, LIAN Xiao-hui, TAN Jie-hui, LI Jin-lei. Effect of micro carbon nanotubes coating on electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material. Journal of Materials Engineering, 2020, 48(5): 68-74.
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