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Research Article | Open Access

High energy density and superior charge/discharge efficiency polymer dielectrics enabled by rationally designed dipolar polarization

Zizhao Pana,1,b, Yupeng Panc,1, Li Lia,b, Xinwei Xua,b, Jiufeng Donga,b, Fei Jina,b, Liang Suna,b, Yujuan Niua,b, Chen Xuc( ), Hong Wanga,b( )
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China
Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices & Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China
Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China

1 Zizhao Pan and Yupeng Pan contributed equally to this work.

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

Although many dielectric polymers exhibit high energy storage density (Ue) with enhanced dipolar polarization at room temperature, the substantially increased electric conduction loss at high applied electric fields and high temperatures remains a great challenge. Here, we report a strategy that high contents of medium-polar ester group and end-group (St) modification are introduced into a biodegradable polymer polylactic acid (PLA) to synergistically reduce the loss and enhance Ue and charge-discharge efficiency (η). The resultant St-modified PLA polymer (PLA-St) exhibits an Ue of 6.5 J/cm3 with an ultra-high η (95.4%), far outperforming the best reported dielectric polymers. It is worth noting that the modified molecular structures can generate deep trap centers and restrict the local dipole motions in the polymer, which are responsible for the reduction of conduction loss and improvements in high-temperature capacitive performance. In addition, the PLA-St polymer shows intrinsically excellent self-healing ability and cyclic stability surviving over 500 000 charge-discharge cycles. This work offers an efficient route to next-generation eco-friendly dielectric polymers with high energy density, low loss, and long-term stability.

Keywords

Dielectric polymersEnhanced dipolar polarizationEnd-group modificationSelf-healing abilityLong-term stability

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Journal of Materiomics
Volume 9 Issue 3,
May 2023
Pages 601-608
DOI: 10.1016/j.jmat.2022.11.002
Cite this article:
Pan Z, Pan Y, Li L, et al. High energy density and superior charge/discharge efficiency polymer dielectrics enabled by rationally designed dipolar polarization. Journal of Materiomics, 2023, 9(3): 601-608. https://doi.org/10.1016/j.jmat.2022.11.002

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Received: 17 August 2022
Revised: 21 October 2022
Accepted: 05 November 2022
Published: 01 December 2022
© 2022 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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