氟和钴共同掺杂对LiV_3O_8电化学性能的影响  

Effect of F and Co co-doping on the electrochemical performance of lithium vanadium oxides

作　　者：吴俊莉[1] 童庆松[1] 刘永梅[1] 徐伟[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《云南大学学报（自然科学版）》2006年第6期530-532,538,共4页Journal of Yunnan University(Natural Sciences Edition)

基　　金：教育部重点项目资助;福建省教育厅重点项目资助(03065;JA02159);福建省自然科学基金资助项目(E0510014);福建省科技厅资助项目(2005K012)

摘　　要：采用固相烧结法合成了同时掺杂氟离子和钴离子、具有单斜LiV3O8型结构的锂钒氧化物样品.通过充放电循环实验、循环伏安实验、XRD衍射和热分析对材料的理化性能进行了表征.实验结果表明,理论组成为Li1.38V2.99Co0.01O7.98F0.02的样品的首次放电容量为233 mA.h/g,40次循环的放电容量为192 mA.h/g.在充放电过程中,同时掺氟和钴的样品的放电平台电压较高,表现出较好的循环性能.A Monoclinic LiV3O8 co-doped with F and Co ions was prepared by a solid-state sintering method. The tests doped samples was characterized by charge-discharge, cyclic voltamrnetry, XRD and thermal analysis. The charge-discharge results showed that F and Co co-doping can improve discharged platform and dischargeb, arged capacities. The .sample with a theoretlc composition of Li1.4V2.99Co0.01O7.98F0.02 has a capadty of 233 mA·h/g in the 1st cycle, and 192 mA·h/g in the 40th cycle. The doped sample showed good cyclability with high voltage platform in the charge-discharge process.

关 键 词：锂离子电池 LIV3O8 钴 掺杂剂 氟 

分 类 号：O646[理学—物理化学]