Ultrahigh rate and long-life nano-LiFePO4 cathode for Li-ion batteries

作者：An, Chang-sheng; Zhang, Bao; Tang, Lin-bo; Xiao, Bin; Zheng, Jun-chao^*

来源：Electrochimica Acta, 2018, 283: 385-392.

DOI：10.1016/j.electacta.2018.06.149

• LiFePO4
• High power
• co-doped
• Graphene
• Self-assemble

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(-1 )at 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.

• 出版日期2018-9-1
• 单位中南大学