High-ionic-conductivity polymer electrolyte with high sodium metal compatibility and preparation method of high-ionic-conductivity polymer electrolyte

By combining a three-dimensional cross-linked polymer network containing an ether-oxygen cross-linking agent with a deep eutectic solvent in sodium-ion batteries, the molar ratio of ether-oxygen to sodium ions and the molecular weight of the cross-linking agent are optimized, solving the problems of low mechanical modulus and poor interfacial stability of electrolytes in sodium systems, and achieving high conductivity and long battery life.

CN121812718APending Publication Date: 2026-04-07KUNSHAN BLACK ROCK NEW MATERIAL TECH CO LTD
5 Cites 1 Cited by

Patent Information

Application Number
CN202511887896.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-15
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing sodium-ion batteries with solid or quasi-solid polymer electrolytes suffer from problems such as insufficient ether oxygen sites, excessively high deep eutectic solvent content leading to low mechanical modulus, and poor interfacial stability, making it difficult to suppress sodium dendrite growth while maintaining high salt solubility and high conductivity.

Method used

A three-dimensional cross-linked polymer network is formed by using an ether-oxygen-containing cross-linking agent or a polymerizable monomer, and cross-linked by free radical polymerization. Combined with a dispersed deep eutectic solvent, the molar ratio of ether oxygen to sodium ions and the molecular weight of the cross-linking agent are optimized to form an integrated electrode-electrolyte structure suitable for sodium metal batteries.

Benefits of technology

It achieves high room temperature sodium ion conductivity, mechanical strength and interface stability, significantly improves sodium ion transference number and battery long-term stability, and meets the requirements of high safety and long life sodium ion batteries.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a high-ionic-conductivity polymer electrolyte with strong sodium metal compatibility and a preparation method thereof, and the high-ionic-conductivity polymer electrolyte comprises a three-dimensional cross-linked polymer network formed by free radical polymerization cross-linking of an ether oxygen-containing cross-linking agent or an ether oxygen-containing polymerizable monomer; and, a deep eutectic solvent dispersed in the polymer network; wherein the deep eutectic solvent is formed by at least one sodium salt and at least one hydrogen bond donor and / or hydrogen bond acceptor according to a predetermined molar ratio, and the mass fraction of the deep eutectic solvent in the electrolyte is 50-80 wt%. And high room-temperature sodium ion conductivity is realized while the solid-state / quasi-solid-state safety is maintained. Compared with the traditional PEO-based solid sodium electrolyte, the total ionic conductivity greater than or equal to 2 mS / cm can be realized at room temperature, and is obviously superior to the typical 10 <-5 >-10 <-4 > S.cm <-1 > level; meanwhile, the mechanical strength and the shape retention which are obviously higher than those of a pure gel system are still kept, so that the conductivity and the safety are both considered.
Need to check novelty before this filing date? Find Prior Art