Sol-Gel Synthesis and Electrochemical Performance of Li3V2-2x/3Mnx(PO4)3 Cathode Material for Lithium-ion Batteries

doi:10.3724/SP.J.1077.2012.11735

Abstract

Abstract: Novel cathode material Li₃V_2-2x/3Mnx(PO₄)₃/C was successfully synthesized by Sol-Gel method using CH₃COOLi·2H₂O, V₂O₅, Mn(CH₃COO)₂·4H₂O, (NH₄)₂HPO₄ and sucrose as raw materials. The as-prepared products were characterized by XRD, XPS, SEM.The results show that a small amount of Mn2+doping do not alter the structure of Li₃V₂(PO₄)₃ materials with a monoclinic structure (space group P21/n), and the valence states of V and Mn in Li₃V_1.94Mn_0.09(PO₄)₃/C are +3 and +2, respectively. The Li₃V_1.94Mn_0.09(PO₄)₃ particle with uniform shape of sphere and diameter less than 200 nm, shows the best cyclic stability and rate performance. Controlling the charge and discharge voltage range from 3.0 to 4.8 V at the rate of 0.1C, the first charge and discharge capacity of Li₃V_1.94Mn_0.09(PO₄)₃ are up to 182.1 and 168.8 mAh/g, respectively, and its discharge efficiency is up to 92.69%. After 100 cycles, its discharge capacity can also retain 77.4% of the first one.

Key words: cathodic materials, lithiumion batteries, Li₃V_2-2x/3Mn_x(PO₄)₃, Sol-Gel method

CLC Number:

TM912

LIU Guo-Cong, LIU You-Nian, LIU Su-Qing, DONG Hui. Sol-Gel Synthesis and Electrochemical Performance of Li₃V_2-2x/3Mnx(PO₄)₃ Cathode Material for Lithium-ion Batteries[J]. Journal of Inorganic Materials, 2012, 27(10): 1017-1022.

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Sol-Gel Synthesis and Electrochemical Performance of Li₃V_2-2x/3Mnx(PO₄)₃ Cathode Material for Lithium-ion Batteries

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