Recent development of high energy density polymers for dielectric capacitors

Yong Wang, Xin Zhou, Qin Chen, Baojin Chu, Qiming Zhang

Research output: Contribution to journalArticlepeer-review

265 Scopus citations


High energy density dielectric materials are desirable for capacitors and other energy storage systems. Two approaches were developed to achieve high electric energy density: explore high dielectric constant (K) materials and improve high operation electric field. Relaxor ferroelectric polyvinylidene fluoride (PVDF) based copolymers P(VDF-HFP), P(VDF-CTFE) and terpolymer P(VDF-TrFE-CFE) have been proven to possess high electric energy density. An energy density of over 25 J/cm3 has been achieved in PVDF-based polymers, which represents the state of art in high energy density polymers. Aromatic polyurea thin films were developed through vapor phase deposition, exhibiting relatively high dielectric constant, low loss, high breakdown field (>800 MV/m) and consequently high energy density (>12 J/cm3). Its thermal stability up to 200°C and high charge-discharge efficiency (>90%) make it attractive for high temperature capacitors. Investigation through SEM, AFM and other experiments indicated unbalanced aromatic polyurea could exhibit apparent high-K (∼15) due to the non-uniformity of film thickness and surface morphology. This article reviews the recent development of these high performance polymers.

Original languageEnglish (US)
Article number5539672
Pages (from-to)1036-1042
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number4
StatePublished - Aug 2010

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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