期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 14, 页码 4927-4931出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14471b
关键词
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资金
- Australian Research Council (ARC) under an ARC Centre of Excellence Program [CE0561616]
- Linkage project [LP120200432]
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.
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