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Self-assembled graphene and LiFePO4 composites with superior high rate capability for lithium ion batteries

Journal Article


Abstract


  • 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.

Publication Date


  • 2014

Citation


  • Luo, W., Chou, S., Zhai, Y. & Liu, H. (2014). Self-assembled graphene and LiFePO4 composites with superior high rate capability for lithium ion batteries. Journal of Materials Chemistry A, 2 (14), 4927-4931.

Scopus Eid


  • 2-s2.0-84900589480

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1025

Number Of Pages


  • 4

Start Page


  • 4927

End Page


  • 4931

Volume


  • 2

Issue


  • 14

Abstract


  • 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.

Publication Date


  • 2014

Citation


  • Luo, W., Chou, S., Zhai, Y. & Liu, H. (2014). Self-assembled graphene and LiFePO4 composites with superior high rate capability for lithium ion batteries. Journal of Materials Chemistry A, 2 (14), 4927-4931.

Scopus Eid


  • 2-s2.0-84900589480

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1025

Number Of Pages


  • 4

Start Page


  • 4927

End Page


  • 4931

Volume


  • 2

Issue


  • 14