# US 10,481,461 B2 · Reversible electrochemical mirror

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- Number: US 10,481,461 B2
- Document ID: US10481461B2
- Status: Granted
- Kind: B2
- Application number: 15/945,405
- Filed: 2018-04-04
- Published: 2019-01-24
- Granted: 2019-11-19
- Earliest claimed: 2017-07-21
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Seong-Mok Cho; Sujung Kim; Tae-Youb Kim; Juhee Song; Chil Seong Ah; Yong Hae Kim; Joo Yeon Kim; Hojun Ryu; Jeong Ik Lee; Sang Hoon Cheon; Chi-Sun Hwang
- Web page: https://patentgrep.com/patent/US10481461B2

## CPC

- G02F 1/19: based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169
- G02F 1/163: Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
- G02F 2001/1555: {Counter electrode}
- G02F 2201/12: electrode
- 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

## Abstract

Provided is a reversible electrochemical mirror including a first substrate and a second substrate, which face each other, a first transparent electrode disposed on the first substrate and facing the second substrate, a second transparent electrode disposed on the second substrate and facing the first transparent electrode, an electrolyte solution interposed between the first transparent electrode and the second transparent electrode, and a counter electrode material layer disposed on the second transparent electrode and contacting the electrolyte solution.

## Claims

### Claim 1

A reversible electrochemical mirror comprising:
a first substrate;
a second substrate facing the first substrate;
a first transparent electrode disposed on the first substrate and facing the second substrate;
a second transparent electrode disposed on the second substrate and facing the first transparent electrode;
an electrolyte solution interposed between the first transparent electrode and the second transparent electrode; and
a counter electrode material layer disposed on the second transparent electrode and contacting the electrolyte solution,
wherein the counter electrode has a planar surface contacting the electrolyte solution,
wherein the counter electrode includes one of an ion storage material and an electrochromic material, and
wherein the electrolyte solution includes a first chemical and a second chemical, such that when a voltage having a first polarity is applied between the first transparent electrode and the second transparent electrode, a metal in the first chemical forms a metal layer on the first transparent electrode, and when a voltage having a second polarity opposite the first polarity is applied between the first transparent electrode and the second transparent electrode, the metal layer dissolves into the electrolyte solution and the counter electrode absorbs an ion from the second chemical.

### Claim 2 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein the counter electrode material layer includes at least one out of tungsten oxide (WO3), cerium oxide (CeO2), titanium oxide (TiO2), nickel oxide (NiO), molybdenum oxide (MoO3), cobalt oxide (CoO2), iridium oxide (IrO2), and tin oxide (SnO2).

### Claim 3 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein the metal layer includes silver (Ag) or bismuth (Bi), and the electrolyte solution includes silver ions or bismuth ions.

### Claim 4 (depends on 3)

The reversible electrochemical mirror of claim 3, wherein the second chemical in the electrolyte solution includes lithium ions.

### Claim 5 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein the electrolyte solution further includes at least one solvent selected from water, dimethyl sulfoxide (DMSO), propylene carbonate, and ethylene glycol.

### Claim 6 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein the electrolyte solution does not include copper ions.

### Claim 7 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein the first and second transparent electrodes include ITO or FTO.

### Claim 8 (depends on 1)

The reversible electrochemical mirror of claim 1, wherein, when a negative voltage is applied to the first transparent electrode, the metal layer is electrodeposited on the first transparent electrode such that the reversible electrochemical mirror becomes a mirror state, and when a negative voltage is applied to the second transparent electrode, the metal layer dissolves into the electrolyte solution such that the reversible electrochemical mirror becomes a transparent state.