掺钴LiFePO_4/C的电化学性能研究  

STUDY ON THE ELECTROCHEMICAL PERFORMANCE OF THE COBALT DOPED LITHIUM IRON PHOSPHATE

作　　者：黄维静[1] 童庆松[1] 李变云[1] 李秀华[1] 郑立群[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：《华南师范大学学报（自然科学版）》2009年第A02期37-38,共2页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20973038);福建省发改委资助项目(闽发改高技2008[794]);福建省自然科学基金资助项目(2008J0144);福建省科技厅资助项目(2009I0007)

摘　　要：通过固相烧结法制备了掺钴的LiFePO4/C正极材料.采用充放电测试、循环伏安和交流阻抗等现代技术测试了样品的电化学性能.结果表明,750℃烧结的掺钴样在2 C倍率电流下首次循环的放电容量达到115 mAh/g.该样品50次循环的容量衰减率仅为2.61%,电化学性能稳定.Cobalt doped lithium iron phosphate samples were prepared by using a solid - state sintering method. Charge -discharge cycles, cyclic voltammogram and electrochemical impedance spectra were employed to study the physicochemical performances. Experimental results indicate that the sample prepared at 750℃ exhibits an intial capacity of 115 mAh/g at 2 C rate. After 50 cycles, the capacity fading of the sample is only 2. 61% , exhibiting good stability.

关 键 词：锂离子电池 正极材料 LIFEPO4 Co掺杂剂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]