High Electrochemical Performance of Sodium-Ion Gel Polymer Electrolytes Achieved Through a Sandwich Design Strategy Combining Soft Polymers with a Rigid MOF

Hanjiao Huang, Zongyou Li, Yanjun Gao, Tianqi Wang, Zihan Chen, Songjie Gan, Caizhen Yang, Qiyao Yu () and Jian-Guo Zhang ()
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Hanjiao Huang: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Zongyou Li: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Yanjun Gao: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Tianqi Wang: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Zihan Chen: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Songjie Gan: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Caizhen Yang: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Qiyao Yu: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Jian-Guo Zhang: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Energies, 2025, vol. 18, issue 5, 1-12

Abstract: Sodium-ion batteries (SIBs) are considered the next-generation candidates for partially substituting for commercial lithium-ion batteries in future energy storage systems because of the abundant sodium/potassium reserves and these batteries’ cost-effectiveness and high safety. Gel polymer electrolytes (GPEs) have become a popular research focus due to their advantages in terms of safety and performance in research on quasi-solid-state sodium-ion batteries (QSSIBs). Building on previous studies that incorporated MOF fillers into polymer-based gel electrolytes, we propose a 3D sandwich structure in which MOF materials are first pressed into thin films and then coated and protected by polymer materials. Using this approach, we achieved an ion conductivity of 1.75 × 10 −4 S cm −1 at room temperature and an ion transference number of 0.69. Solid-state sodium-ion batteries using this gel film electrolyte exhibited long cycling stability at a 2 C current density, retaining 75.2% of their specific capacity after 500 cycles.

Keywords: sodium-ion batteries; gel polymer electrolyte; solid-state batteries; sandwich membrane (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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