Electrochemical Properties of LiFePO4 Synthesized by Sol-gel Approach Using PEG as a SurfactantReport as inadecuate




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Mesoporous LiFePO4 was synthesized through sol-gel approach by employing CH3COOLi·2H2O, FeCl3·6H2O, NH4H2PO4, sucrose as raw materials, PEG as a surfactant. The sample was characterized by X-ray diffractionXRD, scanning electron microscopeSEM and N2-adsorption-desorption isothermsBET. Its electrochemical performance was investigated and compared with LiFePO4 synthesized by solid state approach. The results indicated that the material synthesized through sol-gel approach has loosely mesoporous structure with homogenous pore distribution. The specific surface area is high up to 48.69m2-g. The material exhibits better electrochemical performance than the material synthesized by solid state approach. Under discharge rates of 0.2C, 1C, 5C, 10C, the specific discharge capacity reaches up to 143.8, 133.1, 124.1, 117.0 mAh-g, respectively. It has good capacity retention of 99.2% after 100 cycles.

KEYWORDS

lithium-ion battery; LiFePO4; sol-gel approach; surfactant; polyethylene glycol

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Author: Zhao-cong Wu, Rui-an Huang, Xiao-ling Zhou, Bin Yang, Yong-nian Dai

Source: http://www.scirp.org/



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