Lithium Battery Interlayer Using Metal-Carbon Composite Barrier

An interlayer comprising a metal-carbon composite is introduced between the anode and the liquid-impermeable ion-conductive membrane (solid electrolyte). This interlayer acts as an intermediary that prevents direct contact between the anode and solid electrolyte, thereby preventing harmful reactions while maintaining ion conductivity. The metal-carbon composite structure provides both mechanical stability and electrochemical functionality, resolving the contradiction by adding a protective intermediary layer that improves reliability without excessive complexity increase.

The interlayer is constructed using a metal-carbon composite material where metal particles are chemically bonded to a carbonaceous material matrix. This composite structure combines the advantages of both materials: the metal provides high electrical conductivity and catalytic activity for lithium ion insertion/extraction, while the carbon matrix provides structural stability, porosity for electrolyte penetration, and chemical inertness. This composite approach enhances charge/discharge efficiency and lifespan while keeping the additional layer thin and functionally integrated.

The metal-carbon composite interlayer serves as a protective intermediary barrier between the anode and the liquid-impermeable ion-conductive membrane. It physically separates these two components, preventing direct harmful reactions while still allowing lithium ion transport. The interlayer can be applied through conventional coating methods onto the solid electrolyte surface, adding a thin protective layer without significantly complicating the manufacturing process.

The carbonaceous material in the metal-carbon composite provides a porous structure that allows lithium ions to diffuse through while the metal particles dispersed within provide conductive pathways and active sites for ion insertion/extraction. This porous architecture enables the interlayer to function as a selective barrier that blocks harmful direct contact between anode and solid electrolyte while maintaining high ion conductivity, thus preventing harmful factors without requiring a dense thick layer that would complicate manufacturing.

The interlayer uses a metal-carbon composite where metal particles (such as silver, aluminum, or silicon) are chemically bonded to a carbonaceous material matrix. The metal particles provide high electrical conductivity and active sites for lithium ion insertion/extraction, while the carbon matrix provides chemical stability and physical protection against reactions with the solid electrolyte. This composite structure successfully combines the high conductivity of metals with the stability of carbon, resolving the contradiction between power and reliability.

The metal-carbon composite structure creates local functional zones: metal-rich regions provide high electrical conductivity and catalytic activity for fast ion exchange, while carbon-rich regions provide chemical inertness and structural stability. This spatial distribution of different material properties within the composite allows simultaneous optimization of conductivity and stability, with each material performing its specialized function in appropriate locations throughout the interlayer structure.