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Graphene wrapped LiFePO4/C composites as cathode materials for Li-ion batteries with enhanced rate capability
Faculty of Engineering - Papers (Archive)
  • Yi Shi, University of Wollongong
  • Shulei Chou, University of Wollongong
  • Jia-Zhao Wang, University of Wollongong
  • David Wexler, University of Wollongong
  • Hui-Jun Li, University of Wollongong
  • Hua-Kun Liu, University of Wollongong
  • Yuping Wu, Fudan University
RIS ID
62392
Publication Date
1-1-2012
Publication Details

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.

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 200 °C, followed by sintering at 600 °C 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 165 mA h g−1 at 0.1 C and 88 mA h g−1 at 10 C, respectively. Therefore, the LiFePO4/C/graphene composite is a promising candidate for the development of high-performance, cost-effective lithium batteries for the hybrid vehicle and electric vehicle markets.
Grant Number
ARC/DP110103909
Disciplines
Citation Information
Yi Shi, Shulei Chou, Jia-Zhao Wang, David Wexler, et al.. "Graphene wrapped LiFePO4/C composites as cathode materials for Li-ion batteries with enhanced rate capability" (2012) p. 16465 - 16470
Available at: http://works.bepress.com/shulei/40/