Solid-state battery negative electrode, solid-state battery, and preparation method and application thereof

CN122177940APending Publication Date: 2026-06-09CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In solid-state lithium batteries, uneven deposition of lithium ions on the negative electrode side leads to lithium dendrite growth and cell volume expansion, affecting the battery's cycle stability and safety.

Method used

A negative electrode layer consisting of metal wires and carbon materials is formed on the surface of the negative electrode current collector, creating a uniformly distributed three-dimensional conductive network structure. This provides abundant lithiophilic sites and high electronic/ionic dual conductivity, promoting uniform lithium-ion deposition and suppressing dendrite growth and volume expansion.

Benefits of technology

It improves the uniformity of lithium-ion transport and deposition, reduces interface resistance, enhances the structural stability and safety of the negative electrode layer, and extends the cycle life and safety of the battery.

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Abstract

The application relates to the technical field of batteries, in particular to a negative electrode of a solid-state battery monomer, the solid-state battery monomer and a preparation method and application thereof. The solid-state battery monomer comprises a positive electrode, a negative electrode and a solid-state electrolyte layer arranged between the positive electrode and the negative electrode; the negative electrode comprises a negative electrode current collector and a negative electrode layer arranged on at least one surface of the negative electrode current collector; and the negative electrode layer comprises metal wires and carbon materials. The metal wires provide abundant and uniform lithium-philic sites, quickly transfer lithium atoms into the lithium metal body phase, realize uniform deposition of lithium metal, inhibit dendrite growth, reduce accumulation of by-products such as dead lithium, and improve the cycle stability of the battery. The carbon materials have a low volume expansion effect and induce interface reactions, form excellent ion and electron transmission channels, reduce interface resistance, and promote uniform deposition of lithium metal. The metal wires also have self-supporting properties and mechanical strength, can relieve volume strain in the lithium deposition process, and improve the cycle safety of the battery.
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