Issue

Vol. 18 (2026)

Intramolecular Design of Poly(ethylene oxide) for Solid-State Electrolytes and Next-Generation High-Energy Batteries

https://doi.org/10.1007/s40820-026-02161-4
Shijun Zhang
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Ruiliu Jia
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Xiaoyu Ji
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Ziqing Zeng
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Lei Li
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Lijun Fu
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Jianjun Zhang
Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, People’s Republic of China
Bin Chen
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Yen Wei
The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
Henghui Xu
Laboratory of Power and Energy Storage Batteries, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430033, People’s Republic of China
Yang Yang
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, People’s Republic of China
Guanglei Cui
Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, People’s Republic of China

Corresponding Author: Guanglei Cui

cuigl@qibebt.ac.cn

Nano-Micro Letters, Vol. 18 (2026), Article Number: 370

Abstract

Solid-state electrolytes (SSEs) are key materials for next-generation high-energy batteries because of their enhanced chemical and mechanical stabilities. Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) exhibit great physical contact with electrodes, electrochemical compatibility with lithium (Li) metal anodes, as well as easy processibility and high economic efficiency, having become the pioneer and one frontrunner for developing all-solid-state high-energy batteries. However, PEO-based SPEs also suffer from a trade-off between ionic conductivity and mechanical strength, an insufficient cationic transference number, and a weak high-voltage stability, limiting their practical achievement in desirable power and energy density. Herein, we present a comprehensive overview on the intramolecular design strategies of PEO, which has the potential to fundamentally tackle above challenges compared to the intermolecular plasticizer or ceramic blending approaches. Topological and chemical designs for target mechano-electro-chemical performance are classified and summarized in detail. On this basis, a perspective on the unconquered issues and future directions is proposed, providing guidance for the design and application of high-performance SSEs for next-generation high-energy batteries, with special emphasis on the rational integration of intramolecular and intermolecular methods and the development of advanced manufacture techniques for flexible yet robust thin films.


Highlights:
1 This review summarizes the intramolecular design strategies of poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) for next-generation high-energy batteries.
2 Guided by bottleneck issues, this work categorized the intramolecular design into two approaches: topology and chemistry, with corresponding methodology, structure–property relationship, and underlying mechanism being clarified.
3 Forward-looking perspective on current challenges and future research directions of PEO-based SPEs is carefully proposed.

Keywords

Poly(ethylene oxide)(PEO) Molecular design Solid-state electrolyte High-energy batteries
Zhang, Shijun, Ruiliu Jia, Xiaoyu Ji, Ziqing Zeng, Lei Li, Lijun Fu, Jianjun Zhang, Bin Chen, Yen Wei, Henghui Xu, Yang Yang, and Guanglei Cui. 2026. “Intramolecular Design of Poly(ethylene Oxide) for Solid-State Electrolytes and Next-Generation High-Energy Batteries”. Nano-Micro Letters 18 (May):370. https://doi.org/10.1007/s40820-026-02161-4.
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