This technology forms a gel polymer electrolyte protective layer on the surface of a lithium metal anode by polymerizing a mixture of monomers, a liquid electrolyte containing lithium salt, and inorganic particles. This reduces interfacial resistance with the solid electrolyte and suppresses chemical reactions.
Sulfide-based solid electrolytes are highly reactive with lithium metal, often leading to decomposition or significant interfacial resistance. The formation of voids at the interface can also trigger lithium dendrite growth and crack propagation, which limits the safety and lifespan of the battery.
This technology involves mixing monomers such as ETPTA and a liquid electrolyte containing dissolved lithium salt with inorganic particles like ZnO, applying the mixture to the lithium metal surface, and performing photo- or thermal polymerization to create a uniform protective layer. This layer increases the lithium-ion diffusion coefficient and significantly enhances electrode-electrolyte interface stability. Applicable to sulfide-based all-solid-state batteries using lithium metal anodes and high-energy-density devices in telecommunications, transportation, and energy storage, it maintains interfacial contact and reduces the risk of cell short-circuits with a film thickness of less than 1 ㎛.
This invention was developed with support from the Ministry of Science and ICT for a single-ion conductor-based multidimensional free-form power system.
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