弛豫时间分布函数应用于电化学阻抗谱分析  

Application of distribution function of relaxation time in analyzing electrochemical impedance spectroscopy

作　　者：王春林[1,2] 朱广焱 张鹏博 方小红 WANG Chunlin;ZHU Guangyan;ZHANG Pengbo;FANG Xiaohong(Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;University of Chinese Academy of Sciences,Beijing 100049,China;Pylon Technologies,Co.,Ltd.,Shanghai 201210,China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院大学,北京100049 [3]上海派能能源科技股份有限公司,上海201210

出　　处：《电源技术》2021年第12期1569-1572,1593,共5页Chinese Journal of Power Sources

摘　　要：电化学阻抗谱作为一种现代测试手段,对测试和提高锂离子电池的性能提供了便利。由于电化学阻抗谱无法直观地反映电池内部的结构以及电化学过程,且常用的等效电路模型方法在分析电化学阻抗谱上存在一定的局限性,因此引入了弛豫时间分布函数方法用于分离和量化电池内部的电化学过程。构建了一套完整的用弛豫时间分布函数方法分析锂离子电池的电化学阻抗谱的流程,并成功应用于磷酸铁锂原型电池的电化学阻抗谱分析中。Electrochemical impedance spectroscopy(EIS),as a modern measurement method,provides convenience for testing and improving the performance of lithium-ion batteries(LIBs).Since the electrochemical impedance spectroscopy(EIS)cannot directly reflect the structure and electrochemical process inside the battery,and the equivalent circuit model method is limited in the analysis of EIS,the function of the distribution of relaxation time(DRT)method is introduced to separate and quantify the electrochemical process inside the battery.A complete set of procedures for the analysis of EIS of LIB by the DRT method was constructed and successfully applied to the analysis of EIS of LIB by lithium iron phosphate(LiFePO_(4)).

关 键 词：弛豫时间分布函数(DRT) 电化学阻抗谱(EIS) 锂离子电池(LIB) 

分 类 号：TM912.9[电气工程—电力电子与电力传动]