【摘要】 以LiOH·H2O、NH4VO3、H3PO4和柠檬酸等为原料,采用溶胶-凝胶法合成了锂离子二次电池正极材料磷酸钒锂[Li3V2(PO4)3]。考察了煅烧温度、煅烧时间、原料配比等条件对产物组成及电化学性能的影响。结果表明,以n(Li)∶n(V)=3.2∶2.0投入原料,在700℃下煅烧8h,合成的正极材料具有优良的电化学性能。样品在0.1C充放电下,首次放电比容量达到130.0mAh/g。X射线衍射(XRD)结果表明,以溶胶-凝胶法合成纯相Li3V2(PO4)3晶体所需温度比固相法低。更多还原

【Abstract】 Lithium-ion battery cathode material Li3V2(PO4)3 was synthesized by sol-gel method using LiOH·H2O,NH4VO3,H3PO4 and citric acid as the raw materials.The effects of temperature,reaction time and proportion(Li/V)on composition and electrochemical performance were investigated.The results show that the samples have excellent performance when reaction temperature and time were 700 ℃ and 8 h,respectively.Addition of excessive Li can enhance the electrochemical performance of the samples.Electrochemical properties of Li3V2(PO4)3 were investigated and its first discharge capacity of the cathode was 130.0 mAh/g.The samples prepared at different temperatures were investigated by X-ray diffraction,which showed the temperature of synthesizing samples by sol-gel procedure was lower than that of solid-state reaction.更多还原