Ultrahigh Energy Density Achieved at High Efficiency in Dielectric Capacitors by Regulating α‐Phase Crystallization in Polypropylene Films with Fluorinated Groups

Author:

Li Wenxuan1,Wang Qiuwei1,Zhang Guanxiang2,He Yijin1,Qin Ba1,Zhang Xiao2,Liu Zhenxue3,Gong Honghong1,Zhang Zhicheng1ORCID

Affiliation:

1. National Innovation Platform (Center) for Industry‐Education Integration of Energy Storage Technology Xi'an Key Laboratory of Sustainable Energy Material Chemistry School of Chemistry Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China

2. National Key Laboratory of Electromagnetic Energy Naval University of Engineering Wuhan 430034 P. R. China

3. Shandong Chambroad Holding Group Co., Ltd. Binzhou 256500 P. R. China

Abstract

AbstractPolypropylene (PP)‐based dielectric film capacitors cannot meet the rapid development requirements of electromagnetic energy equipment because of their low energy storage density (Ue). The development of new dielectric materials is hampered by the trade‐off between high energy storage properties and thin film processibility for capacitors. This study proposes a strategy to improve the comprehensive energy storage properties of PP films by reconciling the trade‐offs not only between their polarity and crystallinity but also between their energy storage and processing performance. In this approach, a trifluoroethyl methacrylate (TFEMA) modified PP film is fabricated at the kilogram scale. The TFEMA units regulate PP crystallization in the α‐phase, resulting in improved mechanical, dielectric, and energy storage performance. The optimal PP‐g‐TFEMA film exhibits a remarkable breakdown strength (Eb) of 865 MV m−1 and a record Ue of 8.2 J cm−3 at over 90% discharge efficiency. The promising thin film processibility, excellent self‐healing, and long‐term reliability of PP are finely preserved in the aluminum (Al) coated PP‐g‐TFEMA film. These findings present a novel avenue to significantly increase the Ue of film capacitors for long‐term service not only in academia but also in industry.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Fundamental Research Funds for the Central Universities

Key Research and Development Projects of Shaanxi Province

Publisher

Wiley

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