Synthesis and Characterization of Composite Cathode Material xLiFePO4·yLi3V2(PO4)3

doi:10.3724/SP.J.1077.2009.00143

Abstract

Abstract: 5LiFePO₄·Li₃V₂(PO₄)3 was synthesized via calcining amorphous 5LiFePO₄·Li₃V₂(PO₄)₃ obtained through lithiation of FePO₄·xH₂O and V₂O₅ by using oxalic acid as a novel reducing agent at room temperature. The crystal structure, morphology and electrochemical properties of the products were investigated. The results show that the sample synthesized at 650℃ for 12h has fine particle sizes of 100-200nm with homogenous sizes distribution. Electrochemical measurement results indicate that the material exhibites high rate characteristic and high discharge capacity of 158mAh/g (theoretic capacity 156.8mAh/g) and 114mAh/g at 1C and 10C rate, respectively. There is no obvious capacity fade observed after 100 cycles at 10C rate. The electrochemical performance of composite cathode material 5LiFePO₄·Li₃V₂(PO₄)₃ is better than that of individual cathode material, such as LiFePO₄ and Li₃V₂(PO₄)₃.

Key words: lithium ion battery, composite cathode material, 5LiFePO₄·Li₃V₂(PO₄)₃, electrochemical performance

CLC Number:

TM912

ZHENG Jun-Chao,LI Xin-Hai,WANG Zhi-Xing,QIN Dong-Mian,GUO Hua-Jun,PENG Wen-Jie. Synthesis and Characterization of Composite Cathode Material xLiFePO₄·yLi₃V₂(PO₄)₃[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00143.

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Synthesis and Characterization of Composite Cathode Material xLiFePO₄·yLi₃V₂(PO₄)₃

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