COMPOSITION FOR PREPARING SOLID ELECTROLYTE, AND SOLID ELECTROLYTE AND LITHIUM SECONDARY BATTERY USING THE SAME

The present invention relates to a composition for preparing a solid electrolyte including a polyrotaxane compound, a cross-linking agent, a lithium salt, and an organic solvent, wherein the cross-linking agent includes a compound represented by Formula 1 and a compound represented by Formula 2, a method for preparing a solid electrolyte for a lithium secondary battery including thermal-curing the composition, a solid electrolyte for a lithium secondary battery including a thermo-cured product of the composition, and a lithium secondary battery including the solid electrolyte.