All-Organic Quantum Dots-Boosted Energy Storage Density in PVDF-Based Nanocomposites Via Dielectric Enhancement and Loss Reduction

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2025 Feb 13

PMID 39940592

Authors

Ru Guo

Xi Yuan

Xuefan Zhou

Haiyan Chen

Haoran Xie

Quan Hu

Hang Luo

Dou Zhang

Affiliations

Soon will be listed here.

Abstract

Dielectric capacitors offer immense application potential in advanced electrical and electronic systems with their unique ultrahigh power density. Polymer-based dielectric composites with high energy density are urgently needed to meet the ever-growing demand for the integration and miniaturization of electronic devices. However, the universal contradictory relationship between permittivity and breakdown strength in traditional ceramic/polymer nanocomposite still poses a huge challenge for a breakthrough in energy density. In this work, all-organic carbon quantum dot CDs were synthesized and introduced into a poly(vinylidene fluoride) PVDF polymer matrix to achieve significantly boosted energy storage performance. The ultrasmall and surface functionalized CDs facilitate the polar -phase transition and crystallinity of PVDF polymer and modulate the energy level and traps of the nanocomposite. Surprisingly, a synergistic dielectric enhancement and loss reduction were achieved in CD/PVDF nanocomposite. For one thing, the improvement in and high-field originates from the CD-induced polar transition and interface polarization. For another thing, the suppressed dielectric loss and high-field are attributed to the conductive loss depression via the introduction of deep trap levels to capture charges. More importantly, was largely strengthened from 521.9 kV mm to 627.2 kV mm by utilizing the coulomb-blockade effect of CDs to construct energy barriers and impede carrier migration. As a result, compared to the 9.9 J cm for pristine PVDF, the highest discharge energy density of 18.3 J cm was obtained in a 0.5 wt% CD/PVDF nanocomposite, which is competitive with most analogous PVDF-based nanocomposites. This study demonstrates a new paradigm of organic quantum dot-enhanced ferroelectric polymer-based dielectric energy storage performance and will promote its application for electrostatic film capacitors.

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