锂离子固体电解质研究中的电化学测试方法

doi:10.19799/j.cnki.2095-4239.2019.0296

摘要/Abstract

摘要：

锂离子固体电解质是发展高安全性固态锂电池的关键材料，其性能与全电池的性能表现密切相关。离子电导率、电子电导率、化学窗口和对锂界面稳定性是锂离子固体电解质的基础电化学性能。对这些基础性能的准确测试有助于分析锂离子固体电解质材料的特性与功能，指导固态电池的构建。本文详细介绍交流阻抗谱法测试锂离子固体电解质的离子电导率的原理，并结合实例分析了仪器设备、阻塞电极、电极引线和测试偏压对测量结果的影响。针对氧化物、硫化物和聚合物三类锂离子固体电解质体系，本文介绍对称电池的制作方法并结合实测得到的典型阻抗谱曲线分析不同种类电解质材料的差异。此外，本文详细阐述了基于离子阻塞电极的直流极化方法测量电解质的电子电导率、基于改进的Hebb-Wagner电池构型的循环伏安法测量电解质的电化学窗口和基于金属锂对称电池的电化学循环方法测量电解质与锂的界面稳定性，并结合具体案例阐述数据的分析。

关键词: 固体电解质, 电导率, 电化学窗口, 界面稳定性, 锂电池

Abstract:

Lithium-ion solid electrolyte is a key material for the development of high-safety solid-state lithium batteries, and its electrochemical performance is closely related to the full batteries. Ionic conductivity, electronic conductivity, electrochemical window, and stability versus lithium interface are the key electrical and electrochemical properties of solid electrolytes. In-depth characterization and analysis can help understand the compatibility between different electrolyte and electrode materials, which facilitates the development of high-performance solid-state lithium batteries. This study introduces different types of lithium-ion solid electrolytes. The key electrochemical performances, methods, principles, and equipment for testing are described. In addition, the analysis of the data is described in combination with specific cases.

Key words: solid electrolytes, conductivity, electrochemical window, interfacial stability, lithium batteries

中图分类号:

TM 911

黄晓, 吴林斌, 黄祯, 林久, 许晓雄. 锂离子固体电解质研究中的电化学测试方法[J]. 储能科学与技术, 2020, 9(2): 479-500.

HUANG Xiao, WU Linbin, HUANG Zhen, LIN Jiu, XU Xiaoxiong. Characterization and testing of key electrical and electrochemical properties of lithium-ion solid electrolytes[J]. Energy Storage Science and Technology, 2020, 9(2): 479-500.

图/表 9

参考文献 44

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