# US 7,411,716 B2 · Gel polymer electrolyte containing ionic liquid and electrochromic device using the same

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- Number: US 7,411,716 B2
- Document ID: US7411716B2
- Status: Granted
- Kind: B2
- Application number: 11/108,063
- Filed: 2005-04-18
- Published: 2005-10-20
- Granted: 2008-08-12
- Earliest claimed: 2004-04-19
- Assignees: LG Chem, Ltd.
- Inventors: Jae Seung Oh; Jae Duk Park; Byoung Bae Lee; Won Jong Kwon; Sang Ho Kim; Su Jin Mun
- Web page: https://patentgrep.com/patent/US7411716B2

## CPC

- C09K 9/02: Organic tenebrescent materials
- B24B 37/04: designed for working plane surfaces
- B24B 57/02: for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
- G02F 1/1525: {characterised by a particular ion transporting layer, e.g. electrolyte}
- Y10T 137/86268: With running joint between movable parts of system
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- 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

Disclosed is an electrochromic device comprising: (a) a first electrode; (b) a second electrode; (c) an electrochromic material; and (d) a gel polymer electrolyte containing an ionic liquid. A method for manufacturing the same is also disclosed. The electrochromic device uses a gel polymer electrolyte comprising an ionic liquid. Therefore, there is no problem related with electrolyte leakage. Additionally, it is possible to manufacture electrochromic devices by using plastic materials, because the ionic liquid gel polymer electrolyte permits structural deformation with ease. Further, because the electrochromic device uses an ionic liquid, it is possible to minimize side reactions between constitutional elements of an electrochromic device and electrolyte.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the electrochromic device comprises the electrochromic material in at least one of the first electrode, the second electrode and the electrolyte.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the ionic liquid comprises a combination of:
(i) a cation selected from the group consisting of ammonium, imidazolium, oxazolium, piperidinium, pyrazinium, pyrazolium, pyridazinium, pyridinium, pyrimidinium, pyrrolidinium, pyrrolinium, pyrrolium, thriazolium and triazolium, and
(ii) an anion selected from the group consisting of F−, Cl−, Br−, I−, NO3−, N(CN)2−, BF4−, ClO4−, RSO3−, RCOO− (wherein R is a C1˜C9 alkyl group or phenyl group); PF6−, (CF3)2PF4−, (CF3)3PF3−, (CF3)4PF2−, (CF3)5PF−, (CF3)6P−, (CF3SO3−)2, (CF2CF2SO3−)2, (CF3SO3)2N−, CF3CF2(CF3)2CO−, (CF3SO2)2CH−, (SF5)3C−, (CF3SO2)3C−, CF3(CF2)7SO3−, CF3CO2− and CH3CO2−.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the monomer is at least one vinyl monomer selected from the group consisting of acrylonitrile, methyl methacrylate, methyl acrylate, methacrylonitrile, methyl styrene, vinyl esters, vinyl chloride, vinylidene chloride, acrylamide, tetrafluoroethylene, vinyl acetate, methyl vinyl ketone, ethylene, styrene, para-methoxy styrene, para-cyanostyrene and acrylates.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the electrolyte precursor solution further comprises a lithium salt or acid.