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Research Article | Open Access

E-beam irradiation of poly(vinylidene fluoride-trifluoroethylene) induces high dielectric constant and all-trans conformation for highly ionic conductive solid-state electrolytes

Chen Dai1Florian J. Stadler1Zhong-Ming Li2Yan-Fei Huang1( )
College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China
College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
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Abstract

Polymer matrices have limited abilities to dissociate lithium salts and transport ions, thus making most solid-state polymer electrolytes (SPEs) have extremely low ionic conductivities (10−7–10−5 S/cm) at 25 ℃. In this work, a high-energy electron-beam (e-beam) irradiation is applied to a poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] SPE to improve the ionic conductivity. P(VDF-TrFE) easily shows pure all-trans (TTTT) conformation with all fluorine atoms located on one side of the carbon chain to provide an ion transport highway. E-beam irradiation keeps large amounts of TTTT conformation of P(VDF-TrFE) and produces –CF3 side groups, where the latter expands the interchain distance to split the large ferroelectric domains into nanosize to induce a unique relaxor ferroelectric behavior. This enhances the dielectric constant of the irradiated P(VDF-TrFE) from 15 to 20 and thus facilitates lithium salt dissociation. As a consequence, the ionic conductivity of the irradiated P(VDF-TrFE) SPE is increased from 5.8 × 10−5 to 1.6 × 10−4 S cm−1 at 25 ℃. The solid-state Li//Li symmetrical cell cycles for more than 3000 h at 25 ℃ without a short circuit. Furthermore, the solid-state LFP//Li cell cycles stably for more than 350 cycles with a capacity retention of around 91.3% at 1 C and 25 ℃. This study paves a new way to prepare high-performance SPEs by inducing high dielectric constants and abundant TTTT conformations through e-beam irradiation.

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Energy Materials and Devices
Article number: 9370016
Cite this article:
Dai C, Stadler FJ, Li Z-M, et al. E-beam irradiation of poly(vinylidene fluoride-trifluoroethylene) induces high dielectric constant and all-trans conformation for highly ionic conductive solid-state electrolytes. Energy Materials and Devices, 2023, 1(2): 9370016. https://doi.org/10.26599/EMD.2023.9370016

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Received: 25 November 2023
Revised: 18 January 2024
Accepted: 19 January 2024
Published: 29 January 2024
© The Author(s) 2023. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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