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Multilayered Hierarchical Polymer Composites for High Energy Density Capacitors


There is an urgent need to develop advanced energy storage materials to meet ever-increasing demands of modern electronics and electrical power systems. Polymer-based dielectric materials are one of the most promising energy materials due to their unique combination of high breakdown strength, low dielectric loss, light weight and ultrahigh power density. However, their energy densities are severely limited by their low dielectric constants (K) and thus fall short of the demands of compact and efficient energy storage devices. Remarkable efforts have been performed to improve K, and consequently, energy energies of polymers, e.g. introducing high-K inorganic fillers into polymer matrix to form polymer composites. However, a general drawback is that the increased K is usually achieved at the cost of substantially decreased breakdown strength, thus leading to a moderate improvement of energy density. More recently, the polymer dielectrics with optimized hierarchically layered structures becomes an emerging approach to resolve the existing paradox between high K and high breakdown strength in single-layered composite films, which result in substantial improvement in the capacitive energy storage performance. It is demonstrated that the electric field distribution, breakdown strength and capacitive performance can be readily adjusted by systematically varying the interfaces, chemical structures and ratios of the constituent layers. This review, for the first time, outlines the contemporary models and theories, and summaries the most research advances of multilayered hierarchical polymer composites (MHPCs), including inorganic particle/organic MHPCs and all-organic layered films in the field for high-energy-density capacitors. The efficient strategies for improving the energy storage performance of MHPCs have been highlighted. To conclude, the remaining challenges and the promising opportunities for the development of MHPCs for capacitive energy storage applications are presented.

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Publication details

The article was received on 27 Nov 2018, accepted on 08 Jan 2019 and first published on 10 Jan 2019

Article type: Review Article
DOI: 10.1039/C8TA11392K
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Multilayered Hierarchical Polymer Composites for High Energy Density Capacitors

    Y. Wang, J. Chen, Y. Li, Y. Niu, Q. Wang and H. Wang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11392K

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