SOLID ELECTROLYTE COMPOSITE, POSITIVE ELECTRODE ACTIVE MATERIAL SLURRY INCLUDING THE SAME, AND SOLID ELECTROLYTE SLURRY INCLUDING THE SAME

The present disclosure relates to a solid electrolyte composite, a positive electrode active material slurry including the solid electrolyte composite, and a solid electrolyte slurry including the solid electrolyte composite. More particularly, the present disclosure relates to a solid electrolyte composite, which includes a sulfide-based solid electrolyte and a surface modifier on a surface of the sulfide-based solid electrolyte. The surface modifier includes a linear hydrocarbon chain and a polar functional group bonded to the linear hydrocarbon chain, and the surface modifier is attached to the surface of the sulfide-based solid electrolyte via the polar functional group.