Ultrahigh energy density of poly(vinylidene fluoride) from synergistically improved dielectric constant and withstand voltage by tuning the crystallization behavior

Ru Guo, Hang Luo, Xuefan Zhou, Zhida Xiao, Haoran Xie, Yuan Liu, Kechao Zhou, Zhonghui Shen, Longqing Chen, Dou Zhang

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Capacitor dielectrics with high energy density are urgently needed in power electronics and pulsed power system applications. To date, the most explored ceramic/polymer nanocomposites still suffer from the common challenge of a contradictory relationship between permittivity and the electric breakdown strength due to the overloading of nanofillers. Orientated films are considered the most prospective and scalable manufacturing option to overcome the above problems. Herein, a series of stretched PVDF polymer films were fabricated, and they demonstrated a substantial and concurrent increase in both electric displacement and breakdown strength (e.g.16.10 μC cm−2at 798.8 kV mm−1) by tuning its crystallization behavior in multiaspects. The phase transition and crystal orientation led to enhanced electric polarization, while the high strain-induced enhancement of Young's modulus and suppression of leakage current brought significant improvement in electric breakdown strength. Particularly, the effects of crystalline morphologies and orientations on the electric polarization behavior and stress distribution under high electric fields have been revealed by theoretical simulation, for the first time. As a consequence, the stretched PVDF films at a high strain of 500% (R= 5) almost presented the highest discharge energy density of 34.90 J cm−3among dielectric polymers, along with a high energy efficiency of 68.2%, based on the solid-state drawing process. This work provides a feasible and paradigmatic approach to developing high-performance dielectrics for electrostatic energy storage applications.

Original languageEnglish (US)
Pages (from-to)27660-27671
Number of pages12
JournalJournal of Materials Chemistry A
Volume9
Issue number48
DOIs
StatePublished - Dec 28 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

Fingerprint

Dive into the research topics of 'Ultrahigh energy density of poly(vinylidene fluoride) from synergistically improved dielectric constant and withstand voltage by tuning the crystallization behavior'. Together they form a unique fingerprint.

Cite this