Patent ID: 11873232
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G  B | IPC B  C  G

Claim 7:
8. A method for producing an electrochromic device, the method comprising:
preparing an alkaline solvent having a pH of 8 to 9, which contains at least one of water or alcohol;
adding tungsten hexachloride (WCl6) to the alkaline solvent to form a first reaction solution;
adding an additive to the first reaction solution to form a second reaction solution;
adding strong acid to the second reaction solution to form hexagonal tungsten oxide nanoparticles;
cooling the resultant mixture to room temperature after the adding of the strong acid to precipitate the hexagonal tungsten oxide nanoparticles;
separating the precipitated hexagonal tungsten oxide nanoparticles through a centrifugal separation method;
washing and drying the separated hexagonal tungsten oxide nanoparticles;
heat treating the dried hexagonal tungsten oxide nanoparticles to form dry powder;
mixing the dry powder with a solvent and weak acid to prepare a slurry;
applying the slurry onto a positive electrode to form a coating film;
disposing a negative electrode spaced apart from the positive electrode with the coating film therebetween; and
inserting an electrolyte between the coating film and the negative electrode, wherein the additive includes any one of an amine compound having 1 to 8 carbon atoms or an aliphatic hydrocarbon derivative having 10 or more carbon atoms.