High Energy Density and Discharging Efficiency Achieved in Chlorinated Polyethylene Films for High Energy‐Storage Applications

Abstract

AbstractPolymeric dielectric materials with high energy density (Ue), elevated breakdown strength (Eb), and high discharging efficiency (η) are in demand for high‐pulse metalized film capacitor application. In the present work, a randomly chlorinated polyethylene (CPE) with 71 wt% Cl moiety is fabricated in thin film (8–10 µm). Thanks to the high Cl content, CPE exhibits a rather high glass transition temperature (≈110 °C) and a Young's modulus of 2.6 GPa, which may address its high Eb. The random dispersion of Cl atoms onto the polymer chain is responsible for the well‐maintained medium permittivity (3–4) and low loss at elevated temperature. Both factors result in the rather high Ue (about 12 J cm−3) and high η (about 83%) under an electric field of 700 MV m−1. Its higher energy‐storage capability and operating temperature make CPE a promising polymeric dielectric for high‐pulse metalized film capacitor applications.