Electrochromic structures and methods

• US 5,404,244 A
• Filed: 04/10/1992
• Issued: 04/04/1995
• Est. Priority Date: 04/10/1992
• Status: Expired due to Term

• Current Assignee: Sage Electrochromics, Inc (Compagnie de Saint-Gobain SA)
• Original Assignee: Sun Active Glass Electrochromics Incorporated
• Inventors: Klein, Lisa C., Van Dine, John E., Parkhe, V. D., Trumbore, Forrest A.
• Primary Examiner(s): Epps, Georgia Y.
• Assistant Examiner(s): Lester, Evelyn A.
• Application Number:
  US07/866,606
• Time in Patent Office: 1,089 Days
• Field of Search: 359/265, 359/269, 359/270, 359/275
• US Class Current: 359/270
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte

Abstract

The invention provides for the simplified production of chromogenic devices, including relatively large scale devices in panel form. One or more of the layers of the invention are formed from heated, hydrolyzed gel reaction product of one or more dissolved organo-inorganics, such as alkoxides, which may be metallic. The invention includes an ion-conducting layer which comprises a lithium based ceramic material containing residual organic impurities.

Claims

1. An electrochromic device applied to a substrate comprising an electrochromic layer, a counterelectrode layer, and a ion-conducting layer therebetween, said ion-conducting layer comprising a lithium based ceramic material containing residual organic impurities prepared from the dissolution of at least one metallic organo compound in an organic solvent, and gelation of said metallic organo compound.

2. The electrochromic device of claim 1 wherein said metallic organo compound comprises a metal alkoxide.

3. The electrochromic device of claim 2 wherein said metal alkoxide comprises an lithium alkoxide.

4. The electrochromic device of claim 2 wherein said metal alkoxide comprises a silicon alkoxide.

5. The electrochromic device of claim 1 wherein said organic solvent comprises an alcohol.

6. The electrochromic device of claim 1 wherein at least one of said electrochromic layer and said counterelectrode layer is chemically reduced with a source of charge compensating ions, said charge compensating ions comprising the ions to be conducted by said ion-conducting layer.

7. The electrochromic device of claim 1 wherein at least one of said electrochromic layer and said counterelectrode layer is produced by dissolution of at least one metallic organo compound in a solvent.

8. The electrochromic device of claim 1 wherein said lithium-based ceramic material is selected from the group consisting of lithium silicate, lithium borosilicate, lithium aluminum silicate, lithium niobate, lithium nitride, and lithium aluminum fluoride.

9. The electrochromic device of claim 1 wherein said substrate comprises glass.

10. The electrochromic device of claim 1 wherein said electrochromic layer is selected from the group consisting of tungsten oxide, niobium oxide, molybdenum oxide, nickel oxide, iridium oxide, and mixtures thereof.

11. The electrochromic device of claim 10 wherein said electrochromic layer comprises tungsten oxide.

12. The electrochromic device of claim 1 wherein said counterelectrode layer is selected from the group consisting of vanadium pentoxide, niobium oxide, indium oxide, nickel oxide, cobalt oxide, molybdenum oxide, and mixtures thereof.

13. The electrochromic device of claim 12 wherein said counterelectrode layer comprises vanadium pentoxide.

14. The electrochromic device of claim 1 including first and second transparent conductive layers in contact with said electrochromic layer and said counterelectrode layer, respectively.

15. The electrochromic device of claim 1 including heating said ion-conducting layer subsequent to said gelation step.

16. An electrochromic device applied to a substrate comprising an electrochromic layer, a counterelectrode layer, and an ion-conducting layer therebetween, at least one of said electrochromic layers and said counterelectrode layer being chemically reduced with a source of electrons and charge compensating ions comprising the ions to be conducted by said ion-conducting layer, said ion-conducting layer comprising a lithium based ceramic material containing residual organic material prepared from the dissolution of at least one metallic organo compound in an organic solvent, and gelation of said metallic organo compound.

17. The electrochromic device of claim 16 wherein said metallic organo compound comprises a metal alkoxide.

18. The electrochromic device of claim 17 wherein said metal alkoxide comprises an alkali metal alkoxide.

19. The electrochromic device of claim 16 wherein said organic solvent comprises an alcohol.

20. The electrochromic device of claim 16 wherein said lithium-based ceramic material is selected from the group consisting of lithium silicate, lithium borosilicate, lithium aluminum silicate, lithium niobate, lithium nitride, and lithium aluminum fluoride.

21. The electrochromic device of claim 16 wherein said substrate comprises glass.

22. The electrochromic device of claim 16 including first and second transparent conductive layers in contact with said electrochromic layer and said counterelectrode layer, respectively.

23. The electrochromic device of claim 16 including heating said ion-conducting layer subsequent to said gelation step.