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Published in: Journal of Materials Science 15/2021

12-02-2021 | Energy materials

Superior capacitive energy storage capability in polymer composites induced by polydopamine-coated paraelectric platelets

Authors: Jie Chen, Yifei Wang, Weixing Chen

Published in: Journal of Materials Science | Issue 15/2021

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Abstract

Dielectric nanocomposites with excellent energy storage capabilities have great potential applications in film energy storage capacitors. However, limited energy storage density (Ue) and poor efficiency (η) of nanocomposites based on the incorporation of the high dielectric constant (εr) fillers restrict their practical energy storage application due to low breakdown strengths (Eb) and electric displacement difference (Dmax-Drem) value. Herein, paraelectric SrTiO3 (ST) plates have been successfully synthesized through three-step molten salt process and modified by polydopamine (PDA) nanolayer. The moderate dielectric constant ST has the advantage for increasing the breakdown strength of poly(vinylidene fluoride) (PVDF)-based composites owing to the mitigation of electric field distortion. The ST@PDA platelets bring the highest Dmax-Drem (8.65 μC/cm2) together with enhanced Eb (350 MV/m) to the composites on account of the strong microscopic barrier layers. Consequently, the composite film filled with optimized ST@PDA platelets content (2.5 vol%) endows the maximum Ue of 12.45 J cm−3 at 350 MV/m, which presents the best result when compared to the neat PVDF and dielectric nanocomposites added with diverse ST morphologies including nanoparticles, nanowires, and nanofibers reported previously. This work offers an efficiency strategy utilizing high insulating paraelectric fillers with a plate structure to maximize the improvement in capacitive energy storage performance for dielectric composites.

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Appendix
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Metadata
Title
Superior capacitive energy storage capability in polymer composites induced by polydopamine-coated paraelectric platelets
Authors
Jie Chen
Yifei Wang
Weixing Chen
Publication date
12-02-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 15/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-05883-5

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