以LiCO3、V2O5、NH4H2PO4为原料,采用碳热还原法合成锂离子电池正极材料Li3V2(PO4)3(LVP).根据TG分析得到制备样品的温度范围.对所得材料分别进行了XRD、粉末微电极循环伏安及恒电流充放电测试.XRD分析表明, 850 ℃煅烧所得样品特征衍射峰型尖锐,晶体结构发育良好,为纯相的Li3V2(PO4)3;循环伏安测试表明,锂离子脱嵌分三步进行,循环伏安曲线对称性好;合成的正极材料在7 mA/g恒流充放电,首次充、放电比容量分别为129.8 mA·h/g、116.8 mA·h/g,充放电效率达90%,循环性能有待提高.材料中过量碳的加入提高了其充、放电比容量,使其循环性能有所改善.
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