A lithium metal surface coating modification preparation process for sulfide solid-state electrolyte

By constructing a Li3PO4-Al2O3 composite coating layer on the lithium metal surface, the interfacial compatibility problem between the sulfide solid electrolyte and the lithium metal anode was solved, achieving reduced interfacial impedance and suppression of lithium dendrites, thus improving the cycle stability of the battery.

CN122091776BActive Publication Date: 2026-06-26HANGZHOU WANLIDA NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU WANLIDA NEW ENERGY TECH CO LTD
Filing Date
2026-04-27
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, the interface compatibility problem between sulfide solid electrolyte and lithium metal anode is serious, resulting in high interface impedance and uncontrollable lithium dendrite growth, which affects the long-term cycle stability of the battery.

Method used

A Li3PO4-Al2O3 composite coating layer was formed on the surface of lithium metal using magnetron sputtering and plasma-assisted atomic layer deposition techniques. Combined with vacuum annealing and plasma treatment, a multi-layer protective structure was constructed to enhance the interfacial ion conductivity and chemical stability.

Benefits of technology

It effectively reduces interface impedance, optimizes ion transport channels, inhibits lithium dendrite growth, improves battery interface compatibility and cycle stability, and extends battery life.

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Abstract

The application relates to a lithium metal surface coating modification preparation process for a sulfide solid-state electrolyte, and belongs to the technical field of solid-state lithium battery material preparation. Lithium metal foil is ultrasonically cleaned with anhydrous ethanol and dried; the dried lithium metal foil is placed on a sample table of a magnetron sputtering device, an Al target is used as a sputtering source, mixed gas is introduced, magnetron sputtering is carried out, and an Al2O3 base layer is formed; ethanol lithium and phosphoric acid are used as a lithium source and a phosphorus source respectively, argon is introduced as a carrier gas, plasma-assisted atomic layer deposition composite coating is carried out, and a Li3PO4-Al2O3 composite coating layer is obtained; the lithium metal foil after composite coating is transferred to a vacuum annealing furnace, vacuum annealing is carried out, and the lithium metal foil is transferred to a plasma device after cooling; mixed gas is introduced, plasma treatment is carried out; after argon blowing, the lithium metal foil is taken out and sealed and stored in a glove box. The coated modified lithium metal prepared by the application can effectively reduce the interface impedance and significantly improve the cycle stability of the battery.
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