【摘要】 采用碳热还原(CTR)法以LiOH.H2O、V2O5和NH4H2PO4为原料合成了具有NASCION结构的锂离子蓄电池正极材料磷酸钒锂Li3V2(PO4)3。系统地研究了合成温度、反应时间和原料配比等因素对样品性能的影响。结果表明以n(Li)∶n(V)∶n(P)=3.05∶2.00∶3.00投入原料在800℃下煅烧24h合成的正极材料在0.1C充、放电制度下,首次充电比容量达到137mAh/g,首次放电比容量137mAh/g,充、放电效率达100%,经过20次循环后,放电容量仍然保留110mAh/g,为初始放电容量的84%。对样品进行了X射线衍射(XRD)分析,结果表明合成的样品Li3V2(PO4)3具有单斜晶体结构。更多还原

【Abstract】 Cathode materials lithium-vanadium-phosphate Li3V2(PO4)3 were synthesized by carbon-thermal reduction method,with LiOH·H2O,V2O5 and NH4H2PO4 as the raw materials.The effects of reaction conditions on the properties were studied systematically.The results showed that the sample synthesized from the raw materials with the molar ratio of n(Li)∶n(V)∶n(P) to 3.05∶2.00∶3.00 under 800 ℃ for 24 h had a monoclinic crystal structure,which derived a initial discharge specific capacity of 137 mAh/g.After charged/discharged at 0.1 C rate for 20 cycles,the sample retained a discharge specific capacity of 110 mAh/g.更多还原