文档介绍：摘要
电化学阻抗谱是研究电极/电解质界面发生的电化学过程的最有力工具之一,广泛应用于研究锂离子在锂离子电池嵌合物电极活性材料中的嵌入和脱出过程。本文讲述了阻抗模型的研究背景和研究意义。选用正极材料为 LiFePO4的锂离子电池作为实际的研究对象,通过对电池的内部结构和工作原理的分析,结合电极动力学原理,采用基于电子运动理论的电极等效电路,同时考虑除电极以外的其他组成部分的等效元件,建立了电池阻抗模型。使用电化学测量仪器测量电池的电化学阻抗谱,通过对图谱曲线的特征分析,采用专业的电化学阻抗谱分析软件,对所测得的阻抗数据进行数据拟合、分析。
关键词锂离子电池阻抗模型电化学阻抗谱等效电路
Abstract
Electrochemical impedance spectroscopy is one of the most powerful tools to analyze electrochemical processes occurring at electrode / electrolyte interfaces,and has been widely used to analyze the insertion / desertion process of lithium ion in the intercalation electrode for lithium ion battery. This paper presents the research background and meaning of the Impedance model. Lithium ion battery of LiFePO4 as positive electrode material is chosen as the research object,Through the analysis of internal structure and work principle of battery binatio,with electrode dynamics theory,the equivalent circuit of electrode based on electron movement theory is adopted and the impedance model of battery is established,with other apartment the electrochemical impedance spectroscopy of battery through electrochemical instrument . according to the character of impedance spectroscopy curve and frequency response of equivalent element. Impedance spectroscopy data is fitted and analyzed by special electrochemical software.
Key words:lithium ion battery; impedance model; electrochemical impedance spectroscopy; equivalent circuit
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