流变相反应制备LiFe_(1-x)V_xPO_4及其电化学性能  

Preparation and Electrochemical Properties of LiFe_(1-x)V_x PO_4 by Rheological Phase Reaction

作　　者：李华成 李普良 卢道焕 钟胜奎[1,2] 李春霞 王春飞 

机构地区：[1]中信大锰矿业有限责任公司,广西南宁530028 [2]苏州大学沙钢钢铁学院,江苏苏州215021

出　　处：《中国锰业》2013年第3期20-23,共4页China Manganese Industry

基　　金：广西科学研究与技术开发计划(桂科攻11107019-2)

摘　　要：以草酸亚铁、磷酸二氢锂、偏钒酸铵、PEG-4000为原料,采用流变相反应制备了LiFe1-xVxPO4。研究了不同含量的钒掺杂对样品的晶形结构、形貌以及电化学性能的影响。结果表明:少量V的掺杂未影响到LiFePO4的晶体结构,并细化了材料的颗粒粒径。电化学性能测试表明:V的掺杂明显改善了LiFePO4材料的电化学性能。其中,掺杂量x=0.01的LiFe0.99V0.01PO4样品电化学性能最好,以0.1,1,2,4 C充放电时的首次放电比容量分别为165,155,147,136 mA·h/g,以1,2,4 C循环50次后的比容量分别为154.5,148,134 mA·h/g。LiFe1-xVxPO4 samples were synthesized by rheological phase reaction, using FeC2O4 · 2H2O, LiHEPO4, NH4VO3, PEG-4000, as raw materials. The effect of different content of doped-V on the structure, morphology and electrochemical properties was investigated. The results indicate that doped-V doesn＇ t affect the structure of the material. Appropriate amount of doped-V can make the particle size of LiFe1-xVxPO4 smaller. LiFe0.99 V0.01 PO4 exhibited good cycling performance. Electrochemical test shows that the initial discharge capacity of HFe0.99V0.01PO4 at 0. 1, 1, 2, 4 C was 165, 155, 147,136 mA · h· g-1 respectively, and the capacity retained 154.5, 148,134 mA · h · g-1 at 0. 1, 1, 2, 4 C respectively, after 50 cycles.

关 键 词：锂离子电池 正极材料 LIFEPO4 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]