| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Improving Performance of LiCoO2 Positive Material by Coating Micro Carbon Nanotubes in Collaboration with Graphene |
| TAN Jiehui1,2, DENG Lingfeng1,2,3, ZHANG Shuxian1,2, LI Jinlei1,2, WANG Zhuang1,2, QIN Rongrong1,2
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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 |
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Abstract LiCoO2 positive material was prepared by high temperature solid phase method. Carbon nanotubes(CNTs), graphene oxide (GO) and LiCoO2 were dispersed by ultrasonic. Graphene(GR) were reduced by graphene oxide and CNTs/GR/LiCoO2 composite positive material was uniformly dispersed by spray drying and high temperature reduction. The structure, morphology and electrochemistry performance of the materials were characterized by XRD, FTIR, SEM, TEM and electrochemical measurement. The experimental results show that carbon nanotubes and graphene were alternately dispersed on the surface of LiCoO2 particles, to form a three-dimensional layered nanoscale conductive network, effectively preventing the reunion of composite material. Compared with pure LiCoO2, GR/LiCoO2 and CNTs/LiCoO2, the CNTs/GR/LiCoO2 composite shows better electrochemical properties, whose discharge specific capacity is 171.28 mAh/g at 0.5C, and 154.50 mAh/g after 100 cycles, the capacity retention rate is 90.24%, and the capacity reaches 143.60 mAh/g at 5C.
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Published: 25 January 2022
Online: 2022-01-26
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| Fund:National Natural Science Foundation of China (31530009). |
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