This technology introduces a thin-film surface modification layer composed of catecholamine-based polymers or conductive metal oxides onto the interior and surface of a porous polyolefin film, maximizing wettability and interfacial adhesion with the inorganic solid electrolyte filling the pores.
Conventional porous polymer films have smooth surfaces and low wettability, which prevents inorganic solid electrolytes from adhering properly. This leads to limitations such as interfacial delamination and structural collapse under harsh conditions like high temperatures.
This technology involves forming a coating layer of catecholamine-based polymers, such as polydopamine, or conductive metal oxides, such as Al2O3, with a thickness of 1,000 nm or less on the pores and surface of a polyolefin film, followed by the application and compression of an LPSCl-based sulfide solid electrolyte to produce a hybrid membrane. It can be applied to large-area thin-film electrolytes for sulfide-based all-solid-state batteries and roll-to-roll mass production of all-solid-state cells, ensuring a robust membrane structure that remains free of delamination in high-temperature environments while maintaining a thin electrolyte layer.
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