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Review Article | Open Access

Solid polymer electrolytes: Ion conduction mechanisms and enhancement strategies

Dongmei Zhang§, Xianglong Meng§, Wenyan Hou§, Weihao Hu, Jinshan Mo, Tianrong Yang, Wendi Zhang, Qianxiao Fan, Lehao Liu( ), Bing Jiang, Lihua Chu, Meicheng Li( )
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing 102206, China

§ Dongmei Zhang, Xianglong Meng, and Wenyan Hou contributed equally to this work.

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Abstract

Solid polymer electrolytes (SPEs) possess comprehensive advantages such as high flexibility, low interfacial resistance with the electrodes, excellent film-forming ability, and low price, however, their applications in solid-state batteries are mainly hindered by the insufficient ionic conductivity especially below the melting temperatures, etc. To improve the ion conduction capability and other properties, a variety of modification strategies have been exploited. In this review article, we scrutinize the structure characteristics and the ion transfer behaviors of the SPEs (and their composites) and then disclose the ion conduction mechanisms. The ion transport involves the ion hopping and the polymer segmental motion, and the improvement in the ionic conductivity is mainly attributed to the increase of the concentration and mobility of the charge carriers and the construction of fast-ion pathways. Furthermore, the recent advances on the modification strategies of the SPEs to enhance the ion conduction from copolymer structure design to lithium salt exploitation, additive engineering, and electrolyte micromorphology adjustion are summarized. This article intends to give a comprehensive, systemic, and profound understanding of the ion conduction and enhancement mechanisms of the SPEs for their viable applications in solid-state batteries with high safety and energy density.

Keywords

solid polymer electrolytesionic conductivitysolid-state lithium-ion batterieselectrolyte microstructuremodification strategies

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Nano Research Energy
Volume 2 Issue 2,
June 2023
Article number: e9120050
DOI: 10.26599/NRE.2023.9120050
Cite this article:
Zhang D, Meng X, Hou W, et al. Solid polymer electrolytes: Ion conduction mechanisms and enhancement strategies. Nano Research Energy, 2023, 2: e9120050. https://doi.org/10.26599/NRE.2023.9120050

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Received: 30 September 2022
Revised: 05 December 2022
Accepted: 17 December 2022
Published: 23 February 2023
© The Author(s) 2023. Published by Tsinghua University Press.

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