Structure and Electrochemical Performance of LiFePO4 Cathode with Coating Super Iron Conductor Li3 V2(PO4)3

doi:10.3969/j.issn.0251-0790.2012.02.005

Abstract

Abstract: The composite 9LiFePO₄@Li₃ V₂ (PO₄)₃ was prepared by coating super ion conductor Li₃ V₂ (PO₄)₃ on the surface of LiFePO₄ particles through mechanical activation method. X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, energy disperse spectroscopy and electrochemical measurements were used to evaluate the properties of the cathodes. The coated LiFePO₄ contains olivine LiFePO₄, monoclinic Li₃V₂ (PO₄)₃ and orthorhombic Li₃ PO₄ phases . As LiFePO₄ particles are encapsulated with a layer of Li₃ V₂ (PO₄)₃ and some V³⁺ ions are incorporated into the olivine structure, the LiFePO₄ lattice parameters decrease. Subsequently, the exchange current density and lithium ion diffusion coefficients of coated LiFePO₄ are separately improved one order of magnitude. Electrochemical measurements indicate that the rate capability and cycle performance of coated LiFePO₄ are significantly enhanced. Compared with bare LiFePO₄, the first discharge capacity of coated LiFePO₄ is raised 34.09% and 78.97% at 1C and 2C rates, while the capacity retention increases 27.77% and 65.54% after 150 cycles, respectively. Furthermore, the 9LiFePO₄@Li₃ V₂ (PO₄)₃ exhibits initial discharge capacity of 121.379 mA·h/g at the rate of 5C and its capacity retention is 94.03% after 350 cycles, while the pure LiFePO₄ almost shows no capacity at the same rate.

Key words: Lithium-ion battery, LiFePO₄, Li₃V₂(PO₄)₃, Super ion conductor, Coating

CLC Number:

O614
TM912.9

TrendMD:

ZHANG Xiao-Ping, GUO Hua-Jun, LI Xin-Hai, WANG Zhi-Xing, PENG Wen-Jie, WU Ling. Structure and Electrochemical Performance of LiFePO₄ Cathode with Coating Super Iron Conductor Li₃ V₂(PO₄)₃[J]. Chem. J. Chinese Universities, 2012, 33(02): 236.

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Structure and Electrochemical Performance of LiFePO₄ Cathode with Coating Super Iron Conductor Li₃ V₂(PO₄)₃

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