钽离子掺杂对LiFePO_4/C物理和电化学性能的影响  

Effects of Ta Ion Doping on the Physical and Electrochemical Performance of LiFePO_4/C

作　　者：杨书廷[1] 刘玉霞[1] 尹艳红[1] 王辉[1] 王涛 

机构地区：[1]河南师范大学化学与环境科学学院,新乡453007 [2]河南省新能源材料工程研究中心

出　　处：《无机化学学报》2007年第7期1165-1168,共4页Chinese Journal of Inorganic Chemistry

基　　金：河南省重大科技攻关项目(No.0522020300);河南省重点科技攻关项目(No.072102230008);新乡市科技发展计划项目(No.06G103)

摘　　要：采用PAM(聚丙烯酰胺)模板-溶胶凝胶法在惰性气氛下合成钽掺杂的LiFePO4/C复合正极材料,考察了钽对目标化合物的物理和电化学性能的影响。研究结果表明,0.33C的电流下充放电时,掺杂前后第2个循环的放电容量分别为138.6mAh·g-1和155.5mAh·g-1,循环20次后容量为141mAh·g-1和156mAh·g-1。电化学交流阻抗表明,掺杂后的材料阻抗Rct从180Ω减小到120Ω。振实密度比掺杂前提高0.312g·cm-3。Ta-doped LiFePO4/C cathode material was synthesized through reaction in an inert atmosphere. Effects of Ta^5＋ doping on the physical a Polyacrylamide （PAM） template-sol-gel and electrochemical performances of the cathode materials were investigated. At 0.33C discharge rate, the secondly reversible specific capacity of the Tadoped LiFePO4/C is nearly 17 mAh .g^-1 higher than that of the undoped one. After 20 cycles, the capacity of the former is 156 mAh.g^-1, 15 mAh·g^-1 higher than that of the latter. Impedance Rct of the Ta-doped material is 120Ω, while that of the undoped material is 180Ω The tap density of Ta-doped material was improved by 0.312 g·cm^-3 compared with undoped one.

关 键 词：掺杂 LIFEPO4/C 正极材料 模板-溶胶凝胶法 

分 类 号：O614.513[理学—无机化学] O614.111[理学—化学]