掺杂对锂钒氧化物电化学性能的改善作用  

Improvement effects of doping on the electrochemical performance of lithium vanadium oxides

作　　者：吴俊莉[1] 童庆松[1] 刘永梅[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：《吉林化工学院学报》2006年第1期29-32,共4页Journal of Jilin Institute of Chemical Technology

基　　金：教育部重点(03065;JA02159);福建省自然科学基金(E0510014);福建省科技厅(K0510011)资助项目

摘　　要：采用固相烧结法合成了具有Li1+XV3O8结构组成为Li1+XV2.9M0.1O8(M=B,Bi,Ce)和Li1+XV3O7.9F0.1的掺杂正极材料,充放电循环实验表明,在所有掺杂样品中,理论组成为Li1+XV3O7.9F0.1的样品的放电性能和循环性能是最好的,400℃,500℃,600℃烧结的掺氟样的充放电循环实验表明,400℃样品的首次放电容量为235 mAh/g,40循环的放电容量为176 mAh/g,表现出较好的放电性能和循环性能.Doped lithium vanadium oxides, with the structure of Li1 ＋ xV3O8 and the composition of Li1 ＋xV2.9M0.1O8（M = B, Bi, Ce） and Li1 ＋ XV3O7.9F0.1, were prepared by the solid-state sintering method. The charge-discharge cycle experiments showed the discharged performance and cycle stability of Li1＋x V3O7.9F0.1 sample is best in all doped samples. We then further compared the electrochemical performance of the fluorion doped samples prepared at 400 ℃, 500 ℃, 600 ℃, respectively. The experimental results showed that the fluorion doped sample sintered at 400 ℃ exhibited a capacity of 235 mAh/g at the first cycle and 176 mAh/g at the 40 cycles.

关 键 词：锂离子电池 LI1+XV3O8 掺杂 

分 类 号：O646[理学—物理化学]