Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 2    February 2013

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Grinding-sol-gel synthesis and electrochemical performance of mesoporous Li3V2(PO4)3 cathode materials
Guo-cong LIU1, 2, You-nian LIU1, Su-qing LIU1

1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Department of Chemical Engineering, Huizhou University, Huizhou 516007, China

Abstract:Li3V2(PO4)3 precursor was obtained with V2O5·nH2O , LiOH·H2O, NH4H2PO4 and sucrose as starting materials by grinding-sol-gel method, and then the monoclinic-typed Li3V2(PO4)3 cathode material was prepared by sintering the amorphous Li3V2(PO4)3. The as-sintered samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption and electrochemical measurement. It is found that Li3V2(PO4)3 sintered at 700 °C possesses good wormhole-like mesoporous structure with the largest specific surface area of 188 cm2/g, and the smallest pore size of 9.3 nm. Electrochemical test reveals that the initial discharge capacity of the 700 °C sintered sample is 155.9 mA·h/g at the rate of 0.2C, and the capacity retains 154 mA·h/g after 50 cycles, exhibiting a stable discharge capacity at room temperature.

 

Key words: Li3V2(PO4)3; cathode material; mesoporous structure; grinding-sol-gel method; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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