Skip to main content
placeholder image

Graphene wrapped LiFePO4/C composites as cathode materials for Li-ion batteries with enhanced rate capability

Journal Article


Download full-text (Open Access)

Abstract


  • To reduce the reaction time, electrical energy consumption, and cost, LiFePO4/C/graphene has been

    synthesized by a rapid, one-pot, microwave-assisted hydrothermal method within 15 min at a

    temperature of 200oC, followed by sintering at 600oC for 2 h under a H2/Ar (5 : 95, v/v) atmosphere.

    The microstructure and morphology of the LiFePO4/C/graphene products were characterized by means

    of X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and

    transmission electron microscopy. The carbon coated LiFePO4/C nanoparticles, around 200 nm in size,

    are thoroughly wrapped by crumpled micrometer-size graphene sheets. In this kind of structure, the

    bridging graphene nanosheets can form an effective conducting network and provide interconnected

    open pores that favor electrolyte absorption and reduce the diffusion path of the lithium ions. The cyclic

    voltammograms, charge/discharge profiles, and AC impedance measurements indicated that the

    kinetics of the LiFePO4/C/graphene was better than that of LiFePO4/C. The LiFePO4/C/graphene

    composite exhibited a discharge capacity of 165mAh g -1 at 0.1 C and 88mAh g

    -1 at 10 C, respectively. Therefore, the LiFePO4/C/graphene composite is a promising candidate for the development of highperformance, cost-effective lithium batteries for the hybrid vehicle and electric vehicle markets.

Publication Date


  • 2012

Citation


  • Shi, Y., Chou, S., Wang, J., Wexler, D., Li, H., Liu, H. K. & Wu, Y. (2012). Graphene wrapped LiFePO4/C composites as cathode materials for Li-ion batteries with enhanced rate capability. Journal of Materials Chemistry, 22 (32), 16465-16470.

Scopus Eid


  • 2-s2.0-84864230230

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8242&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5310

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 16465

End Page


  • 16470

Volume


  • 22

Issue


  • 32

Place Of Publication


  • United Kingdom

Abstract


  • To reduce the reaction time, electrical energy consumption, and cost, LiFePO4/C/graphene has been

    synthesized by a rapid, one-pot, microwave-assisted hydrothermal method within 15 min at a

    temperature of 200oC, followed by sintering at 600oC for 2 h under a H2/Ar (5 : 95, v/v) atmosphere.

    The microstructure and morphology of the LiFePO4/C/graphene products were characterized by means

    of X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and

    transmission electron microscopy. The carbon coated LiFePO4/C nanoparticles, around 200 nm in size,

    are thoroughly wrapped by crumpled micrometer-size graphene sheets. In this kind of structure, the

    bridging graphene nanosheets can form an effective conducting network and provide interconnected

    open pores that favor electrolyte absorption and reduce the diffusion path of the lithium ions. The cyclic

    voltammograms, charge/discharge profiles, and AC impedance measurements indicated that the

    kinetics of the LiFePO4/C/graphene was better than that of LiFePO4/C. The LiFePO4/C/graphene

    composite exhibited a discharge capacity of 165mAh g -1 at 0.1 C and 88mAh g

    -1 at 10 C, respectively. Therefore, the LiFePO4/C/graphene composite is a promising candidate for the development of highperformance, cost-effective lithium batteries for the hybrid vehicle and electric vehicle markets.

Publication Date


  • 2012

Citation


  • Shi, Y., Chou, S., Wang, J., Wexler, D., Li, H., Liu, H. K. & Wu, Y. (2012). Graphene wrapped LiFePO4/C composites as cathode materials for Li-ion batteries with enhanced rate capability. Journal of Materials Chemistry, 22 (32), 16465-16470.

Scopus Eid


  • 2-s2.0-84864230230

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8242&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5310

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 16465

End Page


  • 16470

Volume


  • 22

Issue


  • 32

Place Of Publication


  • United Kingdom