A three-dimensional polymer-modified interlayer for lithium-ion solid-state batteries and a method for preparing the same

By using a three-dimensional polymer-modified intermediate layer in lithium-ion solid-state batteries, and utilizing a polyamic acid-phosphonate copolymer with indium heterocyclic modified diamine as the core, the problem of lithium dendrite growth was solved, thereby improving the performance of lithium-ion solid-state batteries, including reducing interface resistance and extending cycle life.

CN121618063BActive Publication Date: 2026-04-14INNER MONGOLIA UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610128854.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-04-14
Estimated Expiration
2046-01-30

AI Technical Summary

Technical Problem

Lithium dendrites grow at the lithium metal anode, leading to a decrease in the performance of lithium-ion solid-state batteries, including a decrease in critical current density and an increase in interface resistance.

Method used

A three-dimensional polymer-modified intermediate layer is used, with indium-containing heterocyclic modified diamine as the core monomer of the polyamic acid-phosphonate copolymer, forming a uniform lithium-philic active interface, enhancing interfacial bonding, inhibiting lithium dendrite growth, and forming a continuous lithium-ion transport channel.

Benefits of technology

It effectively reduces lithium deposition overpotential, promotes dendrite-free deposition, enhances interface stability, reduces interface resistance, and improves battery cycle life and ion conductivity.

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Abstract

The present application relates to the technical field of lithium ion solid-state battery, in particular to a three-dimensional polymer modified interlayer for lithium ion solid-state battery and a preparation method thereof, comprising the following steps: adding polyacrylonitrile into N, N-dimethylformamide and stirring until completely dissolved, then adding modified polyamide acid-phosphonate copolymer and continuing to stir to obtain an electrospinning precursor solution, and electrospinning the electrospinning precursor solution to obtain a composite nanofiber membrane. The present application uses indium-containing heterocyclic modified diamine as the core monomer of polyamide acid-phosphonate copolymer, and the excellent lithium affinity activity of the core monomer can reduce the lithium deposition nucleation overpotential, promote the lithium dense dendrite-free deposition, and the indium-containing heterocyclic groups are uniformly dispersed in the three-dimensional framework through the crosslinking network of the modified polyamide acid-phosphonate copolymer, so that the contact interface between the interlayer and lithium metal forms a global uniform lithium affinity site, and the lithium atom concentrated deposition caused by the local lithium affinity activity difference is avoided.
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