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Nano Research Energy 2023, 2: e9120050 https://doi.org/10.26599/NRE.2023.9120050
Review Article | Open Access | Issue | Published: 23 February 2023

Solid polymer electrolytes: Ion conduction mechanisms and enhancement strategies

Show Author's Information 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.

Keywords:
ionic conductivity, solid polymer electrolytes, modification strategies, solid-state lithium-ion batteries, electrolyte microstructure
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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Abstract Full text About this article

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.


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About this article

Solid polymer electrolytes: Ion conduction mechanisms and enhancement strategies

Show Author's information 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.

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: ionic conductivity, solid polymer electrolytes, modification strategies, solid-state lithium-ion batteries, electrolyte microstructure

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Received: 30 September 2022
Revised: 05 December 2022
Accepted: 17 December 2022
Published: 23 February 2023
Issue date: June 2023

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© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

Acknowledgements

This work was supported partially by project of the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(Nos. LAPS21004 and LAPS202114), the Hebei Natural Science Foundation (No. E2022502022), the National Natural Science Foundation of China (Nos. 52272200, 51972110, 52102245, and 52072121), the Beijing Science and Technology Project (No. Z211100004621010), the Beijing Natural Science Foundation (Nos. 2222076 and 2222077), the Huaneng Group Headquarters Science and Technology Project (No. HNKJ20-H88), the 2022 Strategic Research Key Project of Science and Technology Commission of the Ministry of Education, the China Postdoctoral Science Foundation (No. 2022M721129), the Fundamental Research Funds for the Central Universities (Nos. 2022MS030, 2021MS028, 2020MS023, and 2020MS028), and the NCEPU "Double First-Class" Program.

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