Gel polymer electrolyte containing ionic liquid and electrochromic device using the same

A method for manufacturing an electrochromic device, which comprises the steps of:

• (a) providing a first electrode and a second electrode;
• (b) injecting an electrolyte precursor solution into the gap between the first electrode and the second electrode through an inlet and sealing the inlet, wherein the electrolyte precursor solution comprises (i) an ionic liquid, (ii) a monomer operable for forming a gel polymer by polymerization, and (iii) a polymerization initiator, and wherein the electrolyte precursor has a mixing ratio on the weight basis of 0.5-0.95:0.05-0.5:0.00-0.05, when, x represents ionic liquid, y represents monomer operable for forming a gel polymer by polymerization, and z represents polymerization initiator, with the provision that x+y+z=1;
• and
• (c) polymerizing the electrolyte precursor solution to form an ionic liquid gel polymer electrolyte.