摘要
采用恒电位间歇滴定法(PITT)和电化学阻抗谱技术(EIS)测定锂离子电池正极材料LiFePO4中Li+扩散系数。结果表明:随着嵌锂量的变化,锂离子的扩散系数(D Li+)先出现一个极大值,然后出现一个极小值,随后随嵌锂量的增加而增大;扩散系数在10-13 cm2/s^10-16 cm2/s数量级范围内变化;2种方法计算得到的扩散系数在数量级上相符合。
The chemical diffusion coefficient of Li-ion in LiFePO4 cathode material was measured by potentiostatic intermittent titration technique (PITT) and electrochemical impedance spectrum (EIS). The results show that the diffusion coefficient ranges in 10^-13-10^-16 cm^2/s. With the change of Li content the diffusion coefficient appears an extremely large value firstly, latter appears a minimum, then increases. The calculated values by PITT are in agreement with those by EIS.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第8期1255-1259,共5页
The Chinese Journal of Nonferrous Metals
基金
辽宁省科技厅攻关资助项目(2003224005)
关键词
LIFEPO4
扩散系数
PITT
EIS
LiFePO4
diffusion coefficient
potentiostatic intermittent titration technique(PITT)
electrochemical impedance spectrum(EIS)
作者简介
通讯作者:曲涛,博士;电话:0750-35344005-611;E-mail:qvtao@126.com