P123辅助合成的Li3V2(PO4)3/C的电化学性能

摘要

以CH3COOLi、V2O5、H3PO4、草酸以及表面活性剂P123 (EO20PO70EO20)为原料,采用液相法合成了亚微米级的Li3V2( PO4)3/C,通过XRD、SEM和电化学性能分析,研究了煅烧温度对产物的影响.用P123辅助合成的Li3V2( PO4 )3/C粒径减小,电化学性能提高.在850℃下煅烧合成的Li3 V2(PO4)3/C,晶体生长完善,可逆性最好,电荷转移阻抗最小.在3.0～4.3 V循环,0.1C首次放电比容量为128.7 mAh/g,5.0 C放电比容量为104.3 mAh/g,容量保持率为81％.%Sub-micron Li3V2(PO4)3/C was synthesized by solution-phase method,CH3COOLi, V2O5,H3PO4,oxalic acid and surfactant P123(EO20PO70EO20) were used as raw materials. The effects of calcining temperature to the products were studied by XRD,SEM and electrochemical analyses.The particle size of Li3V2(PO4)3/C synthesized with P123 assisted was smaller and its electrochemical performance was improved. The crystal of synthesized Li3V2(PO4)3/C calcining under 850 ℃ grew perfectly,its reversibility was the best,the charge transfer resistance was lowest.The initial specific discharge capacity was 128.7 mAh/g under 0.1 C in 3.0~4.3 V, the 5.0 C specific discharge capacity was 104.3 mAh/g, the capacity retention ratio was 81 % .