Electrochromic element with improved electrolyte layer

An electrochromic, electrolyte layer technology, applied in the direction of color-changing fluorescent materials, vehicle parts, instruments, etc., can solve the problem of inability to deposit materials directly

Active Publication Date: 2018-04-17
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For glass in particular mention is made of fluorine-doped tin oxide (FTO), a material which cannot currently be deposited directly on plastic substrates due to the temperatures required for its preparation

Method used

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  • Electrochromic element with improved electrolyte layer
  • Electrochromic element with improved electrolyte layer
  • Electrochromic element with improved electrolyte layer

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0193] Preparation Example 1: Synthesis of Hybrid Polymer Resin (ORMOCER@Resin 1)

[0194] To 248.35 g of 3-(trimethoxysilyl)propyl methacrylate (MEMO) was slowly added dropwise 27.03 g of 0.1 M HCl solution at a temperature 4 , and cooled to <5°C. 17.2 g of methacrylic acid (MAS) were added dropwise, and the mixture was stirred for 0.5 hours (=reaction solution B). Reaction solution A was then brought to <10°C and reaction solution B was added dropwise so that the reaction temperature was between 4 and 10°C. After the addition is complete, the reaction mixture can be slowly warmed to room temperature and stirred for 2d. The solvent was firstly removed on a rotary evaporator (Rotationsdampfer) and then by means of high vacuum. 298.72 g of a yellowish-orange transparent resin are obtained.

preparation Embodiment 2

[0195] Preparation Example 2: Synthesis of Acrylate Functional Hybrid Polymer Base Resin (HP) (BS-II)

[0196] stage 1

[0197] To a precharge of 40 g (0.08 mol) of 3-glycidoxypropylmethyldiethoxysilane was added dropwise 38 ml of 4N hydrochloric acid at room temperature with stirring, and stirring was continued for 3 days at room temperature. After work-up (washing with water, absorption in acetate, drying over sodium sulfate and removal of volatile constituents), a liquid resin with a high degree of condensation (>90%) and complete ring opening of the epoxy groups is obtained. The resin has a viscosity of 22 Pa·s at 25°C.

[0198] stage 2

[0199]

[0200] To the mixture of 20 g (0.104 mol) of the resin from stage 1, 24 mg of BHT and 61 mg of dibutyltin dodecanoate and optionally the non-aqueous solvent THF under stirring at 37°C in a dry atmosphere Charge dropwise x mol (see table below) isocyanatoethyl methacrylate and continue stirring at 37°C. The course of the re...

Embodiment 1a

[0202] Example 1a - Preparation of Polymer Electrolyte Formulation

[0203] 0.30 g of ethyl methacrylate-methyl acrylate-copolymer Paraloid B72 (dry) was dissolved in 3.00 g of dry propylene carbonate at about 40°C and mixed with 0.29 g of lithium perchlorate (battery grade). The solution was stirred overnight at room temperature (RT) under a dry atmosphere. Then add 0.35 g from the preparation example Resin 1, 0.65 grams of triethylene glycol dimethacrylate and 0.02 grams of Irgacure 651 (photoinitiator), and the mixture was packaged in a dark place. After about 1 hour a homogeneous high viscosity solution was produced which could be used directly for cell assembly.

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Abstract

The invention relates to an electrochromic element comprising two substrates having electrically conductive insides, a layered operating electrode which comprises a metal complex compound and which iscapable of entering into a redox reaction where the transition from the oxidized to the reduced state is attended by an increase of color depth and the transition from the reduced to the oxidized state is attended by a corresponding weakening of color, an electrolyte layer in the form of a transparent, flexible film, and a counterelectrode which is capable of intercalating mobile cations of the electrolyte material and / or of entering into a redox reaction in which when the material of the second electrode changes from the oxidized to the reduced state it exhibits no increase of color depth inthe wavelength region of the increase of color depth of the metal complex compound and preferably is not subject to any increase of color depth at all, where the electrolyte layer comprises at leastthe following components: (a) a crosslinkable hybrid prepolymer, (b) a crosslinkable organic monomer or prepolymer, (c) a non-crosslinkable, thermoplastic organic polymer, and a dissociable salt whoseinorganic cations can, in the presence of a charge difference between the operating electrode and the counterelectrode, move between the said electrodes. The electrochromic element is more particularly suitable as constituent of automobile glazing systems.

Description

Contents of the invention [0001] The present invention relates to flexible electrochromic devices (ECDs) with improved electrolyte layers, which can be fabricated in large areas where required and are suitable for large window areas due to their favorable mechanical and optical properties, curved mounting glasses such as its Required in the automotive sector, as well as any other installation glazing, although not only, but especially where electrically controlled light transmission is desirable and / or for reasons of energy efficiency, safety and / or increased comfort The case of curved panes (window panes, Scheiben) must also be realized. Background technique [0002] It would be particularly advantageous that electrochromic elements could also be implemented in vehicle-mounted glazing; however, currently available technologies are not yet mature enough to scale beyond low-batch scale. "Vehicles" can be understood here in particular as automobiles (passenger cars, trucks, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/02G02F1/15
CPCC09K9/02G02F2001/164G02F1/15B60J3/04C08J5/2243C08J2333/12C08J2351/00C08J2433/10C08J2451/00C09K2211/1007C09K2211/1074C09K2211/187G02F1/153G02F1/155G02F2001/1502G02F2001/1555
Inventor U·波塞特C·约斯特M·肖特J·克拉德C·米勒M·贝克M·平斯克尔T·博科尔R·梅萨罗斯
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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