Ultrahigh rate and long-life nano-LiFePO^sub 4^ cathode for Li-ion batteries

LiFePO4 is one of the most promising cathode materials for Li-ion batteries. However, its low electronic conductivity and slow Li-ion diffusion rate lead to poor electrochemical performance, especially poor rate performance. The hybrid of LiFePO4/Nitrogen and Sulfur co-doped graphene is successfully...

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Bibliographic Details
Published in:Electrochimica acta 2018-09, Vol.283, p.385
Main Authors: An, Chang­sheng, Zhang, Bao, Tang, Lin­bo, Xiao, Bin, Zheng, Jun­chao
Format: Article
Language:English
Subjects:
Batteries
Cathodes
Conductivity
Diffusion rate
Electrochemical analysis
Electrode materials
Electron conductivity
Graphene
Graphite
Ion diffusion
Lithium
Lithium-ion batteries
Nitrogen
Rechargeable batteries
Self-assembly
Sulfur
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Summary:LiFePO4 is one of the most promising cathode materials for Li-ion batteries. However, its low electronic conductivity and slow Li-ion diffusion rate lead to poor electrochemical performance, especially poor rate performance. The hybrid of LiFePO4/Nitrogen and Sulfur co-doped graphene is successfully synthesized via a self-assembly method. Given its Nitrogen and Sulfur co-doped graphene matrix, the hybrid exerts a significantly impact on the electron conductivity of LiFePO4, resulting in excellent electrochemical properties and power density. The LiFePO4 composite has reversible capacity of 106.1 mAhg −1 at 10 C and 94.6 mAhg−1at 15 C. Moreover, with less than 5% loss of discharge capacity after 500 cycles at 10 C, the Nitrogen and Sulfur co-doped graphene can effectively improve the electrochemical performance of LiFePO4.
ISSN:0013-4686
1873-3859