Utilizing Linear Polymers to Optimize Remanent Polarization and Construct Multilayer Interfaces to Obtain High-Efficient Poly(vinylidene fluoride)-Based Energy-Storage Composites

Yang Cui; Guang Liu; Changhai Zhang

doi:10.1021/acs.langmuir.3c02050

Utilizing Linear Polymers to Optimize Remanent Polarization and Construct Multilayer Interfaces to Obtain High-Efficient Poly(vinylidene fluoride)-Based Energy-Storage Composites

Langmuir. 2023 Oct 31;39(43):15297-15305. doi: 10.1021/acs.langmuir.3c02050. Epub 2023 Oct 18.

Authors

Yang Cui^{1

2}, Guang Liu^{1

2}, Changhai Zhang³

Affiliations

¹ School of Electrical Engineering, Nanxun Campus, Zhejiang University of Water Resources and Electric Power, Nanxun 313009, P. R. China.
² School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, P. R. China.
³ Harbin University of Science and Technology, Harbin 150080, P. R. China.

PMID: 37851544
DOI: 10.1021/acs.langmuir.3c02050

Abstract

Polyvinylidene fluoride (PVDF) has been widely studied as a ferroelectric polymer for energy dielectric applications. However, high-polarization PVDF has a low-efficiency issue, owing to high residual polarization. This study introduces highly insulating, low-loss linear polycarbonate (PC) into PVDF-based dielectrics. The PC layer optimizes the remanent polarization (D_r) of PVDF and maintains it within a small range, thus achieving a high charge-discharge efficiency. The multilayer structural design of PVDF-based dielectrics adjusts the interlayer electric field distribution. We have thoroughly studied the influence of the number and proportion of PC layers on the polarization and breakdown of the multilayer films as well as achieved collaborative regulation of dual parameters. Our results indicate that three layers of PC-PVDF-PC (CPC) films containing a large proportion of PC can polarize under high electric fields and maintain excellent charge-discharge efficiency, achieving an energy density and efficiency of 11.48 J/cm³ and 92.4%, respectively, under 610 kV/mm. The PVDF-based dielectrics prepared in this work are all organic films, and their flexibility and foldability are conducive to the preparation of flexible devices.