Effects of Ta Ion Doping on Structure and Electrochemical Performances of Li₃V₂(PO₄)₃/C Cathode Materials

Abstract:

Ta-doped Li3V2(PO4)3 cathode material coated by carbon was synthesized via a sol-gel method. Effects of Ta5+ doping on the physical structure and electrochemical performances of the Li3V2(PO4)3/C cathode materials were investigated. Compared with the undoped sample, the Ta-doped samples had no excess peaks but the larger particle size and the narrower distribution of the particle size, indicating that Ta5+ entered into the structure of (Li1-5xTax)3V2(PO4)3/C rather than forming any impurities. When x was up to 0.01, the best electrochemical properties of the Ta-doped cathode materials had been displayed at the charge and discharge rate of 0.1C with the voltage of 3.0～4.8V. The analysis of cyclic voltammetry revealed that the polarization of the Li3V2(PO4)3/C cathode materials could be effectively decreased by Ta5+ doping(x=0.01), mainly resulting from the better electronic conductivity.

• Periodical: Key Engineering Materials (Volume 519)
• Pages: 137-141
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.519.137
• Online since: July 2012
• Authors: Lei Zhang, Tao Yang, Qian Yang, Zhao Hui Huang, Ming Hao Fang, Yan Gai Liu
• Keywords: Cathode Material, Li₃V₂(PO₄)₃/C, Lithium-Ion Battery

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