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Surface Structure Characterization and Electrochemical Characteristics of Carbon-Coated Lithium Iron Phosphate (C-LiFePO4) Particles

Published online by Cambridge University Press:  12 April 2012

Xiangcheng Sun ,
Kai Sun  and
Bo Cui
Xiangcheng Sun
Affiliation:
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada
Kai Sun
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 US
Bo Cui
Affiliation:
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Canada
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Abstract

Carbon-coated lithium iron phosphate (C-LiFePO4) particles have been synthesized by a solid-state reaction process. Particles surface morphology, olivine-type phase structures and the carbon shell-core structures are investigated in details by transmission electron microscopy (TEM, HRTEM) imaging and electron diffraction (SAED) patterns. Homogenous features of carbon coating of the LiFePO4 particles surface are obviously revealed. HR-TEM imaging and X-ray photoelectron spectroscopy (XPS) confirmed an amorphous sp2 type conducting coating layer on the surface of LiFePO4 particles. Particles shape and size showed the clear single-crystal nature of the phospho-olivine type structures with the rough spherical features of 50-250 nm size range. The characteristics of sp2 type carbon-coating on the LiFePO4 particles surfaces allows improving the electrical conductivity and reducing the diffusion path of the lithium ions, as directly evidenced from electrochemical tests of charge-discharge cycling.

Keywords

energy storagex-ray photoelectron spectroscopy (XPS)transmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1388: Symposium F – Mobile Energy , 2012 , mrsf11-1388-f04-09
Copyright
Copyright © Materials Research Society 2012

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