P123辅助合成的Li_3V_2(PO_4)_3/C的电化学性能  

Electrochemical performance of Li_3V_2(PO_4)_3/C synthesized with P123 assisted

作　　者：马珺[1] 元志红[1] 艾邓均[1] 刘开宇[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《电池》2012年第4期203-206,共4页Battery Bimonthly

基　　金：国家自然科学基金(21071153)

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Li3V2（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—4．3V循环，0．1C首次放电比容量为128．7mAh／g，5．0C放电比容量为104．3mAh／g，容量保持率为81％。Sub- micron Li3 V2 （ PO4 ） 3/C was synthesized by solution-phase method, CH3 COOLi, V2 O5, H3 PO4, oxalic acid and sur- factant 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 Li3Va （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 eapaeity retention ratio was 81 %.

关 键 词：锂离子电池 磷酸钒锂[Li3V2(PO4)3] P123 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]