Effect of CeO2-coating on the electrochemical performances of LiFePO4/C cathode material |
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| Authors: | Jingwen Yao Feng Wu Xinping Qiu Ning Li Yuefeng Su |
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| Affiliation: | aKey Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China;bSchool of Chemical Engineering & the Environment, Beijing Institute of Technology, Beijing 100081, China;cNational Development Center of High Technology Green Materials, Beijing 100081, China;dLaboratory of Advanced Power Sources, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China |
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| Abstract: | The effect of CeO2 coating on LiFePO4/C cathode material has been investigated. The crystalline structure and morphology of the synthesized powders have been characterized by XRD, SEM, TEM and their electrochemical performances both at room temperature and low temperature are evaluated by CV, EIS and galvanostatic charge/discharge tests. It is found that, nano-CeO2 particles distribute on the surface of LiFePO4 without destroying the crystal structure of the bulk material. The CeO2-coated LiFePO4/C cathode material shows improved lithium insertion/extraction capacity and electrode kinetics, especially at high rates and low temperature. At −20 °C, the CeO2-coated material delivers discharge capacity of 99.7 mAh/g at 0.1C rate and the capacity retention of 98.6% is obtained after 30 cycles at various charge/discharge rates. The results indicate that the surface treatment should be an effective way to improve the comprehensive properties of the cathode materials for lithium ion batteries. |
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| Keywords: | Cathode CeO2-coating LiFePO4 Lithium-ion battery Low temperature performance |
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