Thermal Stability and Electrochemical Properties of Separators for Lithium-ion Batteries

Abstract

The mechanical properties, contact angle, thermomechanical and electrochemical properties of PE, PVDF, and ceramic separators were compared. The experimental results show that the PE separator has the largest porosity, the PVDF separator has the best mechanical properties, wettability, and heat resistance. Three kinds of separators were assembled into lithium-ion batteries for electrochemical tests. Among them, the PE separator has the best rate performance, and the ceramic separator has poor performance in charge-discharge cycles. At the same time, the PE and ceramic separators were tested with different amounts of electrolytes at room temperature and a high temperature, and it is found that the capacity of the PE separator is higher at room temperature, while the performance of the ceramic separator is better at a high temperature. The amount of electrolyte also has a certain influence on its electrochemical performance.

Keywords

lithium-ion battery / separator / tensile strength / electrochemical performance

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