Synthesis of the LiFePO_4 by CO Reduction:Reaction Mechanism and Kinetics

Authors

Yun-hua CHEN, State Key Lab for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Yong YANG, State Key Lab for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;

Corresponding Author

Yong YANG(yyang@xmu.edu.cn)

Abstract

LiFePO4 cathode material was synthesized by CO reducing FePO4 and LiOH precursors.The structure,morphology and electrochemical performances of such LiFePO4 material were characterized by XRD,SEM and charge-discharge tests.It was shown that the particle size of the LiFePO4 synthesized with 5% excess of LiOH in the precursor was about 200 nm.By carbon coating,the LiFePO4 electrode was able to deliver a reversible capacity of 158 mAh·g-1 at 0.1C discharge rate.Temperature-programmed X-ray diffraction was employed to monitor the reaction during the formation of LiFePO4,and Li3Fe2(PO4)3 was found to be an intermediate by analyzing the time-resolved XRD patterns.Kinetic study indicates that nucleation and their growth is the rate-determining step in the process of the reaction and the activation energy of this reaction was 89.44 kJ/mol.

Keywords

LiFePO4, CO reduction, temperature-programmed X-ray diffraction, Li3Fe2(PO4)3, mechanism, kinetics

DOI Link

https://doi.org/10.61558/2993-074X.1927

Publication Date

2008-11-28

Online Available Date

2008-11-28

Revised Date

2008-11-28

Received Date

2008-11-28

Recommended Citation

Yun-hua CHEN, Yong YANG. Synthesis of the LiFePO_4 by CO Reduction:Reaction Mechanism and Kinetics[J]. Journal of Electrochemistry, 2008 , 14(4): 388-393.
DOI: 10.61558/2993-074X.1927
Available at: https://jelectrochem.xmu.edu.cn/journal/vol14/iss4/8