锂电池研究中的电导率测试分析方法

Conductivity test and analysis methods for research of lithium batteries

锂电池活性电极材料的锂离子电导率、电子电导率以及电解质的锂离子电导率与锂电池的动力学行为密切相关。电导率的测试分析有助于理解材料的电化学性能,常用的方法包括直流法、交流阻抗法和直流极化法等。本文根据电解质材料和活性电极材料的不同导电特性,分类介绍了电导率测试选取的方法、原理、设备、测试流程和注意事项,并结合具体案例阐述数据的分析。

Lithium ionic conductivity, electronic conductivity of active electrode materials and lithium ionic conductivity of electrolyte materials are closely related to the dynamic behavior of lithium batteries. Therefore, conductivity test and analysis contribute the understanding of electrochemical properties of materials, including direct current method（DC）, alternating current impedance（AC impedance）, and direct current polarization method（DC polarization）. Based on the different conductivity characteristics of electrolyte materials and active electrode materials, this paper introduced the methods, principles, equipments, test procedures and precautions of conductivity test. Besides, the analysis of data was illustrated with specific cases of lithium batteries.