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采用PITT与EIS技术测定锂离子电池正极材料LiFePO_4中锂离子扩散系数 被引量:15

Measurement of diffusion coefficient of lithium in LiFePO_4 cathode material for Li-ion battery by PITT and EIS
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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
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参考文献16

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