Cross-linking agent for quasi-solid electrolyte, quasi-solid electrolyte comprising same, and secondary battery using same

A method for preparing a cross-linking agent for a quasi-solid electrolyte, the method comprising:

• a first operation of adding a polyol compound having two hydroxyl groups in the molecular structure and an amine compound to a first reaction solvent and then stirring the polyol compound, the amine compound, and the first reaction solvent to prepare a first mixture, and mixing a (meta) acryloyl group compound containing an acryloyl group or a methacryloyl group with a second reaction solvent to prepare a second mixture;
• a second operation of adding the second mixture to the first mixture while maintaining the first mixture at −5° C. to 5° C. in an inert gas atmosphere, raising the temperature to room temperature, and then stirring and reacting the first mixture and the second mixture at room temperature for 10 to 20 hours, and then purifying the reactant to manufacture an intermediate product;
• and
• a third operation of adding the intermediate product to a third reaction solvent in an inert gas atmosphere, and then primarily stirring a boron compound containing one or more boron at 45° C. to 55° C. for 1.5 to 7 hours, and then secondarily stirring the primarily stirred mixture at 65° C. to 80° C. for 1 to 5 hours and drying the secondarily stirred mixture in a vacuum oven.