Composite lithium powder anode for all-solid-state batteries, method for manufacturing the same, and all-solid-state battery comprising the same

All-solid-state anode with improved interface using a composite layer of lithium powder, solid electrolyte, and conductor

This technology improves interfacial contact by using a composite anode layer consisting of a specific mixture of lithium powder, solid electrolyte (ion-conductive ceramic + conductive polymer containing lithium salt), and a conductor, instead of lithium foil.

Conventional lithium foil-based anodes suffer from poor contact with solid electrolytes and limited control over foil thickness (difficult to control below 100μm), leading to low cell energy density. Furthermore, they face issues with battery lifespan and safety due to dendrite growth and increased interfacial resistance during charging and discharging.

This technology utilizes a slurry composed of lithium powder (10–40㎛), ion-conductive ceramic, a conductive polymer containing lithium salt, and a conductor in a specific mixing ratio (40:40:10:10 to 40:20:20:20). By applying this slurry onto an anode current collector using a casting method, it achieves three-dimensional interfacial contact and allows for easy control of electrode thickness, thereby enhancing competitiveness in the secondary battery anode material sector.

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Key Features:

• Anode current collector and an anode layer formed thereon, comprising lithium powder, solid electrolyte, and a conductor
• Configuration where the solid electrolyte includes an ion-conductive ceramic and a conductive polymer containing lithium salt
• Composite anode layer in which lithium powder, ion-conductive ceramic, and a conductor are mixed in a predetermined ratio
• Anode for all-solid-state batteries that improves interfacial contact with the solid electrolyte by using a composite anode layer instead of lithium foil

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