Grinding sol gel synthesis and electrochemical performance of mesoporous Li_3V_2(PO_4)_3 cathode materials

作     者：刘国聪 刘又年 刘素琴 Guo-cong LIU;You-nian LIU;Su-qing LIU

作者机构：中南大学化学化工学院长沙410083 惠州学院化学工程系惠州516007 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第2期

页      面：439-444页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Project (51162026) supported by the National Natural Science Foundation of China Projects (20100480949, 201104509) supported by China Postdoctoral Science Foundation Project (133274341015501) supported by Postdoctoral Science Foundation of Central South University, China 

主　　题：Li3Vz(PO4)3 cathode material mesoporous structure grinding-sol-gel method electrochemical performance 

摘      要：Li3V2（PO4）3 precursor was obtained with ***2O , LiOH＇H2O, NH4H2PO4 and sucrose as starting materials by grinding-sol-gel method, and then the monoclinic-typed Li3Vz（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 Li3Vz（PO4）3 sintered at 700 ℃ possesses good wormhole-like mesoporous structure with the largest specific surface area of 188 cmZ/g, and the smallest pore size of 9.3 nm. Electrochemical test reveals that the initial discharge capacity of the 700 ℃ 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.