Characterization and Electrochemical Properties of LiFePO4/C Composite with Carbon Core Structure

doi:10.3724/SP.J.1077.2010.00480

Abstract

Abstract:

LiFePO₄/C composite with carbon core structure was successfully synthesized by using epoxy resin as carbon source. The microstructure, morphology, surface composition of LiFePO₄/C composite were characterized by Xray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscope (XPS). Their electrochemical properties were investigated in terms of galvanostatic chargedischarge and electrochemical impedance spectroscope (EIS) tests. The experimental results show that LiFePO₄/C composite with carbon core structure is composed of amorphous carbon line core and nanometer LiFePO₄ grains. The initial discharge capacity of LiFePO₄/C composite is 166mAh/g at current density of 15mA/g. Its initial discharge capacity is 131mAh/g with capacity retention of 99.2% after 50 cycles at current density of 750mA/g.

Key words: LiFePO₄, composite, carbon core structure, electrochemical properties LiFePO4

CLC Number:

TM912

CHEN Han, GONG Wen-Qiang, LIU You-Liang, LIU Jian-Hua. Characterization and Electrochemical Properties of LiFePO₄/C Composite with Carbon Core Structure[J]. Journal of Inorganic Materials, 2010, 25(5): 480-484.

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Characterization and Electrochemical Properties of LiFePO₄/C Composite with Carbon Core Structure

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