Effect of Ce3+ doping on the properties of LiFePO4 cathode material
来源期刊：Journal of Rare Earths2016年第2期
论文作者：赵南南 李永胜 郅晓科 王丽 赵新新 王亚勉 梁广川
文章页码：174 - 180
摘 要：LiFe1–xCexPO4/C cathode materials were synthesized by solid-state reaction method. The effects of various Ce-doping amounts on the microstructure and electrochemical performance of LiFePO4/C cathode material were intensively investigated. The samples were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy（EIS）. The results indicated that Ce-doping did not destroy the lattice structure of LiFePO4/C, while enlarged the lattice volume tailored the particle size, decreased charge transfer resistance, increased electrical conductivity and Li-ion diffusion rate of LiFePO4/C, and thus markedly enhanced the electrochemical performance of the LiFePO4/C. Electrochemical test results showed that the LiFe0.9Ce0.1PO4/C sample exhibited the best electrochemical performance with initial specific capacity of 155.4 m Ah/g at 0.2 C, the capacity retention ratios of 99.6% at 100 cycles at 1 C and delivered a discharge capacity of 160.1（0.1 C）, 156.6（0.2 C）, 151.2（0.5 C）, 147.6（1 C）, 140.7（2 C） and 136.7 m Ah/g（5 C）, respectively, presented the best rate capacity among all the samples. EIS results demonstrated that the transfer resistance of the sample decreased greatly by doping an appropriate amount of Ce.
赵南南1，李永胜1，郅晓科1，王丽1,2,3，赵新新1，王亚勉1，梁广川1,2,3
1. Institute of Power Source and Ecomaterials Science, Hebei University of Technology2. Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education3. Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology
摘 要：LiFe1–xCexPO4/C cathode materials were synthesized by solid-state reaction method. The effects of various Ce-doping amounts on the microstructure and electrochemical performance of LiFePO4/C cathode material were intensively investigated. The samples were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）, galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy（EIS）. The results indicated that Ce-doping did not destroy the lattice structure of LiFePO4/C, while enlarged the lattice volume tailored the particle size, decreased charge transfer resistance, increased electrical conductivity and Li-ion diffusion rate of LiFePO4/C, and thus markedly enhanced the electrochemical performance of the LiFePO4/C. Electrochemical test results showed that the LiFe0.9Ce0.1PO4/C sample exhibited the best electrochemical performance with initial specific capacity of 155.4 m Ah/g at 0.2 C, the capacity retention ratios of 99.6% at 100 cycles at 1 C and delivered a discharge capacity of 160.1（0.1 C）, 156.6（0.2 C）, 151.2（0.5 C）, 147.6（1 C）, 140.7（2 C） and 136.7 m Ah/g（5 C）, respectively, presented the best rate capacity among all the samples. EIS results demonstrated that the transfer resistance of the sample decreased greatly by doping an appropriate amount of Ce.
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