# US 5,352,504 A · Electrochromic glazing

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- Number: US 5,352,504 A
- Document ID: US5352504A
- Status: Granted
- Kind: A
- Application number: 07/790,722
- Filed: 1991-11-08
- Granted: 1994-10-04
- Earliest claimed: 1990-11-14
- Assignees: Saint-Gobain Vitrage International
- Inventors: Frank Boulanger; Francois Lerbet; Corinne Papret; Franck Perrodo; Gilles Thomas
- Web page: https://patentgrep.com/patent/US5352504A

## CPC

- G02F 1/155: Electrodes
- G02F 1/1533: {structural features not otherwise provided for}
- Y10T 428/12937: Co- or Ni-base component next to Fe-base component
- Y10T 428/24917: including metal layer
- Y10T 428/24926: including ceramic, glass, porcelain or quartz layer
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/265: 1 mil or less
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to an electrochromic glazing successively comprising a glass sheet, a first electrode constituted by a transparent electroconductive layer, whose square resistance is below 5 Ohms, a layer of a cathodic electrochromic material, an electrolyte, a layer of an anodic electrochromic material and a second transparent electroconductive electrode, barrier layers being inserted between the said electrodes and the said electrochromic material layers, the square resistance of the assembly formed by an electrode and its barrier layer being below 5 Ohms.

## Claims

### Claim 1

An electrochromic glazing comprising a glass sheet (1), a first transparent electroconductive electrode (2), a cathodic electrochromatic material layer (4), an electrolyte (5), an anodic electrochromatic material layer (6) and a second transparent electroconductive electrode (8), the first electrode (2) comprising a barrier layer (3) of tin oxide in contact with the cathodic electrochromic material layer (4), and the second electrode comprising a barrier layer (7) of tin oxide in contact with the anodic electrochromic material layer (6) and the second transparent electroconductive electrode (8), wherein the first and second electrodes each have a square resistance below about 5 Ohms.

### Claim 2 (depends on 1)

Electrochromic glazing according to claim 1, characterized in that the said barrier layers (3, 7) have a square resistance exceeding about 20 Ohms.

### Claim 3 (depends on 1)

Electrochromic glazing according to claim 1, characterized in that said barrier layers (3, 7) have a thickness below about 600 nanometers.

### Claim 4 (depends on 1)

The electrochromatic glazing according to claim 1, characterized in that said barrier layers (3,7) each have a density close to the theoretical density of that layer's corresponding crystal lattice.

### Claim 5 (depends on 1)

The glazing according to claim 1 wherein said first and second electrodes further comprise an indium tin oxide layer.

### Claim 6 (depends on 5)

Electrochromic glazing according to claim 5, characterized in that the thickness of said barrier layer is between about 100 and 500 nanometers.

### Claim 7 (depends on 1)

Glazing according to claim 1 wherein the first and second electrodes consist of fluorine doped tin oxide.

### Claim 8 (depends on 1)

Glazing according to claim 1, characterized in that the electrolyte (5) is a protonic conductive electrolyte.

### Claim 9 (depends on 8)

The glazing of claim 8 wherein said electrochromatic layer (6) has a thickness of about 100 nm.

### Claim 10 (depends on 1)

Glazing according to claim 1, characterized in that the electrolyte (5) is a lithium conducting electrolyte.

### Claim 11 (depends on 10)

The glazing of claim 10 wherein said electrochromatic layer (6) has a thickness of about 55 nm.

### Claim 12 (depends on 1)

The glazing of claim 1 wherein said electroconductive layers have a thickness of about 800-900 nm.

### Claim 13

An electrochromic glazing comprising a glass sheet (1),
a first transparent electroconductive electrode (2),
a cathodic electrochromatic material layer (4),
an electrolyte (5) selected from the group consisting of protonic and lithium conducting,
an anodic electrochromatic material layer (6) and a second transparent electroconductive electrode (8),
the first electrode (2) comprising a barrier layer (3) of tin oxide in contact with the cathodic electrochromic material layer (4) and the second electrode comprising a barrier layer (7) of tin oxide in contact with the anodic electrochromic material layer (6),
wherein said anodic electrochromic material layer is iridium oxide when said electrolyte is protonic,
and said anodic electrochromic material layer is nickel oxide when said electrolyte is lithium conducting,
wherein said first and second electrodes comprise an indium tin oxide layer.