• 文献标题:   Self-assembled graphene and LiFePO4 composites with superior high rate capability for lithium ion batteries
  • 文献类型:   Article
  • 作  者:   LUO WB, CHOU SL, ZHAI YC, LIU HK
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Northeastern Univ
  • 被引频次:   51
  • DOI:   10.1039/c3ta14471b
  • 出版年:   2014

▎ 摘  要

A graphene encapsulated LiFePO4 composite has been synthesized by self-assembly of surface modified LiFePO4 and graphene oxide with peptide bonds, followed by reduction. The graphene forms a continuous conductive coating network connecting the LiFePO4 nanoparticles to facilitate electron transportation, resulting in excellent high rate capability with 70% capacity retention at 50 C rate. The apparent activation energy of the graphene encapsulated LiFePO4 composite (9.6 kJ mol(-1)) is much lower than that of the carbon coated LiFePO4 (14.6 kJ mol(-1)). An excellent cycling performance is also demonstrated, in which the capacity loss is less than 8.6% after 950 cycles at 10 C. Therefore, this hybrid material is promising for use as a cathode material for high rate lithium ion batteries.