Hydrothermal Synthesis and Electrochemical Characteristics of Cathode Materials Li3V2(PO4)3/C

doi:10.7503/cjcu20120011

Abstract

Abstract:

A novel hydrothermal method was used to synthesize carbon-coated lithium vanadium phosphate compound. LiOH·H₂O, NH₄VO₃, NH₄H₂PO₄ and maltose without further purification were selected as starting materials to prepare precursor and the Li₃V₂(PO₄)₃/C which was obtained by sintering precursor at 650℃ for 2 h in flowing argon, and the effects of carbon content on electrochemical properties were investigated. The structural, morphology and electrochemical properties were investigated via X-ray diffraction(XRD), transmission electron microscopy(TEM), scanning electron microscopy(SEM) and constant current charge-discharge cycling. The compound synthesized at 650℃ took on pure monoclinic crystal structure, the particle size of the samples were ranged from 100 nm to 300 nm and there was a layer of carbon on the surface of Li₃V₂(PO₄)₃/C particles, which was available for enhancing the conductivity of Li₃V₂(PO₄)₃. Electrochemical properties of Li₃V₂(PO₄)₃/C were investigated. The results show that the Li₃V₂(PO₄)₃/C synthesized at 650℃ exhibits the highest initial discharge capacity of 118.8 mA·h/g and at the 15th cycle, the sample still keeps 115.1 mA·h/g at 1.0C in the voltage range of 3.0-4.3 V with 10.23% carbon contents. This behavior indicates that the Li₃V₂(PO₄)₃/C material obtained by hydrothermal method has excellent capacity retention and rate capability.

Key words: Li₃V₂(PO₄)₃/C, Cathode material, Hydrothermal method, Electrochemical property

CLC Number:

O646
O61

TrendMD:

WANG Huan-Feng, GAO Yan-Ying, JIANG Qian-Qian, MA Cong, WANG Xing-Yao. Hydrothermal Synthesis and Electrochemical Characteristics of Cathode Materials Li₃V₂(PO₄)₃/C[J]. Chem. J. Chinese Universities, 2012, 33(10): 2326.

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Hydrothermal Synthesis and Electrochemical Characteristics of Cathode Materials Li₃V₂(PO₄)₃/C

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