The interval high rate discharge behavior of Li₃V₂(PO₄)₃/C cathode based on in situ polymerization method

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• 作者：Wen-feng Mao^a ; ^{wenfengmao123@gmail.com} ; Ji Yan^c ; Hui Xie^b ; Zhi-yuan Tang^a ; Qiang Xu^a
• 关键词：Lithium vanadium phosphate ; Charge/discharge mode ; In situ polymerization
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：88
• 期：Complete
• 页码：429-435
• 全文大小：1202 K

文摘

An in situ polymerization assisted fast sol-gel method was introduced to synthesize high performance Li₃V₂PO₄/C (LVP/C) cathode material. The crystal structure, surface morphology and electrochemical performances of the LVP/C samples sintered at different temperatures were investigated. The composite sintered at 750 ¡ãC exhibits the highest specific discharge capacity of 119.02 mAh g^?1 (440.35 Wh g^?1) at 10 C rate. The Li⁺ diffusion coefficient ranges from 10^?6 to 10^?8 cm² s^?1 based on different scanning rates and the electronic conductivity is about 10^?5 S cm^?1. For comparison, an ex situ polymerization method was also employed to obtain the LVP/C composite. A novel charge/discharge testing mode was designed to investigate the electrochemical behavior of the as-prepared LVP/C composite for practical application in electric vehicle cells. The obtained high power density and the special testing mode prove the LVP/C composite would be a promising candidate for the electric vehicle application and deserves further investigation.