Superior discharged energy density in polyetherimide composites enabled by ultra-low ZnO@BN core-shell fillers

TY - JOUR

T1 - Superior discharged energy density in polyetherimide composites enabled by ultra-low ZnO@BN core-shell fillers

AU - Wu, Xudong

AU - Gandla, Dayakar

AU - Lei, Li

AU - Chen, Chaoxin

AU - Tan, Daniel Q.

N1 - Publisher Copyright: © 2021 The Authors Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/5/1

Y1 - 2021/5/1

N2 - The primary strategy to increase dielectric constant and energy storage density is adding a high fraction of fillers with high dielectric constant to polymer matrix. Yet, it has not been very successful without encountering processing difficulties, lowered breakdown strength, and mechanical inflexibility. Herein, we introduce an unconventional approach using ultra-low fraction of zinc oxide core and boron nitride shell (ZnO@BN) filler with very high thermal conductivity dispersed in polyetherimide (PEI) for the same purpose. For the 0.1 vol% core-shelled fillers, the PEI composite film exhibits a superior dischargeable energy density of 10.8 J/cm3 and a high efficiency of 92.1% at an electric field of 500 kV/mm. The polarization responses under high electric fields and simulation reveal the association with the increased interfacial polarization of the thermally conductive core-shelled structure. This strategy lays out a new route to further investigate of high energy density composite and capacitor technologies.

AB - The primary strategy to increase dielectric constant and energy storage density is adding a high fraction of fillers with high dielectric constant to polymer matrix. Yet, it has not been very successful without encountering processing difficulties, lowered breakdown strength, and mechanical inflexibility. Herein, we introduce an unconventional approach using ultra-low fraction of zinc oxide core and boron nitride shell (ZnO@BN) filler with very high thermal conductivity dispersed in polyetherimide (PEI) for the same purpose. For the 0.1 vol% core-shelled fillers, the PEI composite film exhibits a superior dischargeable energy density of 10.8 J/cm3 and a high efficiency of 92.1% at an electric field of 500 kV/mm. The polarization responses under high electric fields and simulation reveal the association with the increased interfacial polarization of the thermally conductive core-shelled structure. This strategy lays out a new route to further investigate of high energy density composite and capacitor technologies.

KW - Dielectrics

KW - Interfaces

KW - Polymer composites

KW - Thick film

UR - http://www.scopus.com/inward/record.url?scp=85101383050&partnerID=8YFLogxK

U2 - 10.1016/j.matlet.2021.129434

DO - 10.1016/j.matlet.2021.129434

M3 - 文章

AN - SCOPUS:85101383050

SN - 0167-577X

VL - 290

JO - Materials Letters

JF - Materials Letters

M1 - 129434

ER -