Energy Storage Performance of Polymer-based Composite Based on Cooperative Optimization of Each Layer of Sandwich Structure
Polymer-based dielectric nanocomposites have received a lot of attention recently because of their strong plasticity,high power density,and excellent stability;however,they cannot satisfy the specifications of high-precision en-ergy storage devices in the current electrification era due to their lower energy density and constrained breakdown resistance.In order to obtain a polymer-based composite with both high breakdown strength and high energy storage den-sity,in this paper,a novel sandwich structure composite was created by blending the ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene-chlorofluoro ethylene)(PVTC)with the linear polymer polymethyl methacry-late(PMMA)as the external insulating layer,and PVTC was filled with the core-shell nanofiber BT@AO@PDA NFs with high dielectric constant as the high dielectric polarization layer.The positive sandwich structure(insulation layer-polarization layer-insulation layer)realizes the cooperative improvement of breakdown strength and dielectric constant.Among them,the positive sandwich structure composed of PMMA/PVTC(25%PMMA)composite and 3%BT@AO@PDA/PVTC composite achieves a high energy storage density of 17.25 J/cm3 under the electric field of 562.7 MV/m,and also has excellent charge-discharge cycle stability and ultra-fast discharge rate of 1.42 μs.This work offers a quick and efficient technique for manufacturing flexible dielectric film capacitors with high energy storage.
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维普
