Binary carbon-based additives in LiFePO 4 cathode with favorable lithium storage

Nanotechnology Reviews

article

Jianye Zhang¹  Zhiyong Huang²  Chengen He³  Jinlong Zhang³  Peng Mei²  Xiaoyan Han¹  Xianggang Wang³  Yingkui Yang¹ 

[1] Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities;Hubei Engineering Technology Research Centre of Energy Polymer Materials, School of Chemistry and Materials Science, South-Central University for Nationalities;Graphene R&D Center, Guangdong Xigu Tanyuan New Materials Corporation Limited & South-Central University for Nationalities

关键词: binary conductive agents;    graphene;    carbon nanotubes;    Super-P;    lithium iron phosphate;    lithium-ion batteries;   

DOI  :  10.1515/ntrev-2020-0071

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

A pairwise coupling of 0D Super-P (SP), 1D carbon nanotubes (CNTs), and 2D graphene nanosheets (GNs) into binary carbon-based conductive additives was used here for the LiFePO 4 cathode in lithium-ion batteries. For comparison, the LiFePO 4 cathode with SP, CNT, or GN unitary conductive agent was also examined. Electrochemical test results suggest that the cathodes with binary conducting additives present greatly improved electrochemical performance than the traditional cathode system (only SP used). Especially, the LiFePO 4 cathode containing 3% CNT component exhibits the highest specific capacity and the best cycling stability among all the cathodes with binary conducting additives, indicating that an appropriate amount of CNTs is critical in enhancing the conductivity and practical capacity output. However, an excess of CNTs leads to entangling with each other, hampering the uniform distribution of active materials and resulting in poor electrode performance. Furthermore, the combination of CNT and GN can effectively improve the capacity and cycling stability of the LiFePO 4 cathodes due to the synergistic effect of 3D conductive networks constructed by the two.

【 授权许可】

CC BY