Performance-optimized electrochromic device and preparation method thereof

A technology of electrochromic devices and electrochromic materials, applied in instruments, nonlinear optics, optics, etc., can solve problems such as affecting the transmission of electrolyte anions, inability to change color and time, and difficulty in anion doping, so as to improve uneven discoloration Problems, improvement of discoloration time, effect of shortening incorporation time

Active Publication Date: 2021-12-28
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, little attention has been paid to interface issues in electrochromic devices
Since solid electrolytes and quasi-solid electrolytes modified by composite materials have a certain high mechanical strength, the surface is often hard, and the affinity with the electrodes is not good, so there is a large interface impedance, which affects the anion transport in the electrolyte. As a result, it is difficult to incorporate anions, resulting in the problem that the color cannot be changed or the color change time is very long

Method used

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  • Performance-optimized electrochromic device and preparation method thereof
  • Performance-optimized electrochromic device and preparation method thereof
  • Performance-optimized electrochromic device and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035]An electrochromic device and its performance optimization method, including electrochromic material film forming process, ion transport layer film forming process, device assembly process and device optimization process, the electrochromic material is an organic polymer material , the film forming process is spray film forming; the ion transport layer is a polymer-based electrolyte, and the film forming process of the ion transport layer is also spray coating; the performance-optimized electrochromic device is assembled using full spray coating Film formation, the mode of layer-by-layer stacking (LBL); the optimization technique of described electrochromic device, comprises the following steps:

[0036] Step 1: Spray the xylene solution (3mg / ml Prodot) of the first color-changing polymer onto the conductive surface of ITO glass by spraying, and dry to form a film;

[0037] Step 2: Weigh PVDF-HFP (Mn=400000, monomer ratio 7:3) powder accounting for 60% of the total mass, ...

Embodiment 2

[0061] An electrochromic device adopting interface optimization, the manufacturing method thereof is as follows:

[0062] Step 1: Spray the xylene solution (3mg / ml Prodot) of the first color-changing polymer onto the conductive surface of ITO glass by spraying, and dry to form a film;

[0063] Step 2: Weigh PVDF-HFP (Mn=400000, monomer ratio 7:3) powder accounting for 60% of the total mass, dissolve it in a mixed solution with a volume ratio of acetone and DMF of 3:1, stir until completely dissolved, To obtain a clear and transparent solution, add 1 mol / l LiTFSI / [BMIM][TFSI] liquid electrolyte to the obtained transparent solution, the liquid electrolyte component accounts for 40% of the total mass, stir and mix evenly to obtain an electrolyte solution. Continue to use the spraying method, spray the electrolyte solution onto the color-changing polymer layer, and dry it in vacuum for 10 hours;

[0064] Step 3: Mix the xylene solution (3mg / ml PEDOT) of the second color-changing ...

Embodiment 3

[0069] An electrochromic device adopting interface optimization, the manufacturing method thereof is as follows:

[0070] Step 1: Spray the xylene solution (3mg / ml Prodot) of the first color-changing polymer onto the conductive surface of ITO glass by spraying, and dry to form a film;

[0071] Step 2: Weigh PVDF-HFP (Mn=400000, monomer ratio 7:3) powder accounting for 60% of the total mass, dissolve it in a mixed solution with a volume ratio of acetone and DMF of 3:1, stir until completely dissolved, To obtain a clear and transparent solution, add 1mol / l LiClO to the obtained transparent solution 4 / PC (propylene carbonate) liquid electrolyte, the liquid electrolyte component accounts for 40% of the total mass, and is stirred and mixed evenly to obtain an electrolyte solution. Continue to use the spraying method, spray the electrolyte solution onto the first electrochromic polymer layer, and vacuum dry for 10 hours;

[0072] Step 3: Spray the second color-changing polymer (P...

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Abstract

The invention provides a performance-optimized electrochromic device. The performance-optimized electrochromic device comprises a first substrate, a first color-changing layer, a polymer reference electrolyte layer, a second color-changing layer and a second substrate layer which are sequentially overlapped and packaged into a whole, an interface layer of the polymer reference electrolyte layer and the second color-changing layer is filled with interface infiltration liquid, the interface infiltration liquid is liquid the same as electrolyte in the polymer reference electrolyte layer, and the interface infiltration liquid comprises ionic liquid and/or propylene carbonate organic solution; the ionic liquid is one or more of 1-ethyl-3-methyl bis (trifluoromethanesulfonyl) imide salt, 1-butyl-3-methyl bis (trifluoromethanesulfonyl) imide salt, 1-butyl-1-methylpyrrolidine bis (trifluoromethanesulfonyl) imide salt, 1-ethyl-3-methyl tetrafluoroborate and 1-butyl-3-methyl tetrafluoroborate. The color changing effect, the switching time, the interface impedance and the optical property of the electrochromic device can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of electrochromism, and in particular relates to an electrochromic device with optimized performance and a preparation method thereof. Background technique [0002] The electrochromic phenomenon refers to a phenomenon in which a material undergoes a reversible redox reaction under the action of an applied voltage, accompanied by a reversible change in optical properties (reflectivity, light transmittance, absorbance, etc.). A variation of transparency. Materials with electrochromic phenomenon are called electrochromic materials. Electrochromic devices refer to optoelectronic devices that are prepared based on electrochromic materials and can respond intelligently to external voltage stimulation. Its structure is generally a typical sandwich structure, that is, an electrochromic layer, an electrolyte layer, and an ion storage layer (counter electrode layer) are assembled between two transparent electrodes. When an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/153G02F1/155G02F1/157
CPCG02F1/1533G02F1/155G02F1/157G02F2001/164
Inventor 陶益杰邢国强张世国王义张妍李瑞甘沅丰崔光振
Owner HUNAN UNIV
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