Low-temperature high-conductivity polyether electrolyte and preparation method thereof

By leveraging the synergistic effect of the polyether crosslinking network and the borane-lithium salt complex system, the problem of insufficient conductivity and processing stability of polyether-based solid electrolytes at low temperatures was solved, enabling the preparation of high-conductivity, high-modulus thin films at low temperatures, suitable for all-solid-state lithium battery applications in extreme environments.

CN121812736BActive Publication Date: 2026-06-26JIANGSU LIHONG TECH DEV CO LTD
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Patent Information

Application Number
CN202610267709.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-06
Publication Date
2026-06-26
Estimated Expiration
2046-03-06

AI Technical Summary

Technical Problem

Existing polyether-based solid electrolytes face problems such as restricted chain segment movement, decreased ion transport number, and sharp increase in interfacial contact impedance at low temperatures. They are difficult to balance high modulus, high conductivity at low temperatures, and good processing stability, and lack effective complexation systems and optimized preparation processes.

Method used

By employing a synergistic strategy of polyether crosslinking network construction, borane-lithium salt complexation enhancement, and precise solvent control, a flexible three-dimensional network is formed through the crosslinking polymerization of polyethylene glycol monomethyl ether methacrylate and polyethylene glycol diacrylate. Tris(pentafluorophenyl)borane is introduced to form a Lewis acid-base complex structure with lithium salt. Combined with an acetonitrile complexation-vacuum desolventizing-in-situ polymerization and curing process, a low-temperature high conductivity, high modulus film with excellent processing stability is achieved.

Benefits of technology

It significantly improves low-temperature ion conductivity, with an ion conductivity ≥1×10-4 S/cm, and enhances mechanical modulus and processing stability. It solves the problems of limited chain segment movement and interfacial contact impedance at low temperatures, broadens the processing window, and ensures the uniformity and reproducibility of the film.

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Abstract

The application provides a low-temperature high-conductivity polyether electrolyte and a preparation method thereof. The polyether crosslinking network is formed by crosslinking polyethylene glycol monomethyl ether methacrylate and polyethylene glycol diacrylate, tri(pentafluorophenyl)borane and lithium salt are introduced to form a borane-lithium salt complex system, the molar ratio of lithium ions to borane is accurately controlled to be 1:0.02-0.20, and the acetonitrile complexing-vacuum desolventizing-in-situ polymerization curing process is used, so that the high-purity thin film electrolyte with the ion conductivity ≥1*10 ‑4 S / cm, residual acetonitrile ≤500 ppm and moisture ≤1000 ppm at low temperature is realized, technical problems that the low-temperature conduction capacity decreases when the crosslinking modulus of the traditional polyether electrolyte is improved, the processing window of the high-lithium salt system is narrow, and the interface stability of residual solvent and moisture is difficult to consider are effectively solved, and the low-temperature performance, processing stability and wide solid-state lithium battery application prospect are excellent.
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