CN116430630A - A large-area PEDOT-like electrochromic device and its preparation method - Google Patents

Abstract

The invention discloses a large-area PEDOT electrochromic device and a preparation method thereof. The method comprises: S1, material preparation; S2, pre-cleaning; S3, aging; S4, glue protection; S5, electroplating: on an electroplating substrate Electrodeposit the A-layer electrochromic layer and the B-layer ion storage layer respectively; S6, printed wires: print the A-layer and B-layer lines; S7, wire curing; S8, dam glue: print the Dam glue on the A layer, and then cured by UV or heat to form the dam; S9, scrape coating or dispensing transfer layer; S10, vacuum defoaming; S11, packaging glue: print the packaging glue on the periphery of the dam glue of layer A through the dispensing process; S12 , Device packaging. The invention also provides the large-area PEDOT electrochromic device prepared by the method. The preparation method provided by the invention can obtain a uniform and high-quality PEDOT film, which can improve the yield and greatly reduce the cost.

Description

A large-area PEDOT-like electrochromic device and its preparation method

technical field

The invention relates to a large-area electrochromic device in the field of electrochromic technology and a preparation method thereof, in particular to a large-area PEDOT type electrochromic device and a preparation method thereof.

Background technique

Electrochromic devices can undergo reversible color and light transmittance changes under the drive of external voltage. PEDOT (polyethylenedioxythiophene) has the characteristics of simple molecular structure, small energy gap and high conductivity, and is widely used in the research of electrochromic materials. The electroplating process is often used to prepare uniform PEDOT electrochromic materials to ensure stable device performance. However, the traditional electroplating method is often used to prepare small-area PEDOT-like electrochromic devices. It is difficult to obtain a uniform and high-quality PEDOT film when preparing large-area devices by electroplating, resulting in a significant reduction in yield and a significant increase in cost.

Contents of the invention

The purpose of the present invention is to provide a large-area PEDOT-based electrochromic device and its preparation method, which can solve the problems existing in the existing electroplating process mentioned in the background art.

In order to achieve the above object, the present invention provides a method for preparing a large-area PEDOT electrochromic device, wherein the method includes: S1, preparation: cutting the electroplating substrate; S2, pre-cleaning: cleaning the electroplating substrate with a cleaning solution ; S3, Aging: Baking and aging the electroplating substrate; S4, Adhesive protection: After the aging is completed, attach a protective glue on the electroplating substrate to reserve a pattern for electroplating; S5, Electroplating: Electrodeposit a layer of electroplating on the electroplating substrate respectively Chromogenic layer and B-layer ion storage layer; S6, printed wire: print A-layer and B-layer lines; S7, wire curing: bake and cure the printed A-layer and B-layer; S8, dam glue: apply Dam glue Print on layer A by dispensing process, and then form the dam by ultraviolet or heat curing; S9, scrape coating or dispensing transfer layer: drop the gel electrolyte into the groove formed by the dam glue of layer A, and scrape it evenly; Or dispensing the gel electrolyte into the dam glue of layer A, so that the thickness of the transmission layer is the same as the thickness of the dam glue; S10, vacuum defoaming: vacuum defoaming of the gel electrolyte; S11, encapsulation glue: put the encapsulation glue through The glue dispensing process is printed on the periphery of the dam glue of layer A, and the thickness of the packaging glue is the same as that of the dam glue; S12, device packaging: attach layer B to layer A under vacuum conditions, so that the transmission layer and the surface of layer B During the contact process, it is covered, and the A layer of encapsulant is adhered, and finally the encapsulant is cured by ultraviolet light or heat.

In the method for preparing large-area PEDOT-based electrochromic devices, the electroplating substrate is any one of transparent ITO, AZO, FTO conductive glass or conductive film.

The preparation method of the above-mentioned large-area PEDOT electrochromic device, wherein, the cleaning solution is acetone, ethanol and water; the electroplating substrate is cleaned in the order of acetone, ethanol and water.

The preparation method of the above-mentioned large-area PEDOT electrochromic device, wherein, electroplating, the material of the electrochromic layer of the A layer is PEDOT, and the instantaneous high voltage is applied first during electroplating, and then the current density is changed to continue electroplating; the ion storage layer of the B layer The material is PB, and the electric current is directly applied for electroplating.

The above-mentioned method for preparing a large-area PEDOT-based electrochromic device, wherein, electroplating, the electrochromic layer of the A layer is symmetrical to the ion storage layer of the B layer.

The preparation method of the above-mentioned large-area PEDOT electrochromic device, wherein, after the electroplating is completed, the electroplating substrate is taken out from the electrolytic tank, soaked and cleaned in ethanol and deionized water in sequence, then vacuum-dried, and then the protective glue is peeled off , exposing the unplated area.

The preparation method of the above-mentioned large-area PEDOT electrochromic device, wherein, the printing wire is to print the wire to the non-plated area to connect the electroplating substrate and external equipment, and print the conductive liquid according to the designed circuit; the conductive liquid is silver Any one of paste, copper paste or carbon paste; after printing, layer A and layer B are placed in an oven to cure.

The preparation method of the above-mentioned large-area PEDOT electrochromic device, wherein the gel electrolyte is made of potassium chloride, sodium chloride, lithium perchlorate, lithium hexafluorophosphate, lithium perchlorate, and an aqueous solution of sodium perchlorate Or any one or more of organic solutions; when it is necessary to increase the viscosity of the ion transport layer, add polymer materials including polyacrylamide, polyvinyl alcohol, polyethylene glycol, and polymethyl methacrylate.

The above method for preparing large-area PEDOT electrochromic devices, wherein, the organic solution, the solvent used is any one of propylene carbonate, ethylene carbonate, N-methylpyrrolidone and a mixture of at least two of them.

The present invention also provides a large-area PEDOT electrochromic device prepared by the above method.

The large-area PEDOT electrochromic device provided by the present invention and its preparation method have the following advantages:

The invention can obtain uniform and high-quality PEDOT film when preparing large-area devices by electroplating, can improve the yield of good products, and greatly reduce the cost.

The large-area PEDOT-like electrochromic device prepared by the method has simple and easy-to-operate technology, high economic benefit, and is suitable for large-scale industrial production.

Description of drawings

Fig. 1 is a process flow chart of the preparation method of the large-area PEDOT electrochromic device of the present invention.

Fig. 2 is a schematic structural view of the large-area PEDOT-based electrochromic device of the present invention.

Among them, 1. A-layer electrochromic layer; 2. Dam glue; 3. Gel electrolyte; 4. B-layer ion storage layer.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

The preparation method of the large-area PEDOT electrochromic device provided by the present invention is shown in FIG. 1 .

This method contains:

S1, material preparation: cutting the electroplating substrate;

S2. Pre-cleaning: use a cleaning solution to clean the electroplating substrate;

S3, aging: aging the electroplating substrate by baking;

S4. Adhesive protection: After the aging is completed, a protective adhesive is attached to the electroplating substrate, and the pattern electroplating is reserved;

S5. Electroplating: Electrodeposit A layer electrochromic layer 1 and B layer ion storage layer 4 respectively on the electroplating substrate;

S6. Printing wires: Print the A-layer and B-layer lines, and print the conductive liquid according to the designed lines;

S7. Wire curing: bake and cure the printed A layer and B layer;

S8. Dam glue: Print the Dam glue on the A layer through the dispensing process, and then form the dam by UV or heat curing;

S9. Scraping or dispensing transfer layer: drop the gel electrolyte 3 into the groove formed by the dam adhesive 2 of the A layer, and scrape it evenly; or dispense the gel electrolyte 3 into the dam adhesive 2 of the A layer, Make the thickness of the transmission layer the same as the thickness of the dam glue 2;

S10, vacuum defoaming: performing vacuum defoaming on the gel electrolyte 3;

S11. Encapsulation glue: print the encapsulation glue on the periphery of the dam glue 2 of layer A through the dispensing process, and make the thickness of the encapsulation glue the same as that of the dam glue 2;

S12. Device encapsulation: attach layer B to layer A under vacuum conditions, cover the transmission layer during the contact with the surface of layer B, and adhere the encapsulation glue of layer A, and finally cure the encapsulation glue by ultraviolet or heating.

Preferably, S1, preparing materials, cutting the electroplating substrate into a required area, and the cutting area is determined by the actual electroplating area.

The electroplating substrate used is any one of transparent ITO (indium tin oxide), AZO (aluminum-doped zinc oxide), FTO (fluorine-doped SnO ₂ ) conductive glass or conductive film.

S2. Pre-cleaning, using a cleaning solution to clean the electroplating substrate to improve cleanliness.

The cleaning solution is acetone, ethanol and water; the electroplating substrate is cleaned in the order of acetone, ethanol and water.

S3. Aging is to place the electroplating substrate into an oven for aging and baking.

S4. Adhesive protection. The protective glue used is used to isolate the electroplating substrate and the electrolyte. After the electroplating is completed, the protective glue is peeled off to expose the non-plating area.

S5, electroplating, the material of the electrochromic layer 1 of layer A is PEDOT (polyethylene dioxythiophene). When electroplating, a momentary high voltage is applied first, so that a large number of nucleation sites are generated on the surface of the electroplating substrate to ensure the uniformity of the coating and prevent the coating Defects are generated, the principle is similar to the crystallization of inorganic materials.

The high voltage range is 3V-6V, and the time is 4-16s. After the high voltage is applied, the current density is changed to 0.06mA cm ^-2 -0.6mA cm ^-2 to continue electroplating, and the electroplating time is 40s-260s.

The material of the B-layer ion storage layer 4 is PB (Prussian blue), the applied current density is 0.008mA cm ⁻² ~0.12mAcm ⁻² , and the electroplating time is 80s~220s.

The electrochromic layer 1 of the layer A is symmetrical to the ion storage layer 4 of the layer B.

The distance between the electrochromic layer 1 of layer A and the ion storage layer 4 of layer B during the electroplating process is 0.8 cm to 3.5 cm between the working electrode and the counter electrode.

After the electroplating is completed, the electroplating substrate is taken out from the electrolytic tank, soaked and washed in ethanol and deionized water for 0.5-12 minutes, and then vacuum-dried at 50°C-85°C, the drying time is 0.5h-2.5h, and the vacuum degree is greater than 100kPa; then peel off the protective glue to expose the unplated area.

S6. Printing wires is to print the wires to the non-plating area to connect the electroplating substrate and external equipment, and print the conductive liquid according to the designed circuit; the conductive liquid is any one of silver paste, copper paste or carbon paste.

S7. Wire curing is to put layer A and layer B into an oven for curing after the wire printing is completed.

S8, dam glue, the dam glue is printed on the A layer through the dispensing process, and silica gel can be used as the dam glue (ie, cofferdam glue or dam coating glue). The thickness of the dam glue 2 is 10 μm to 350 μm.

Glue dispensing is a process, also known as sizing, gluing, glue pouring, glue dropping, etc. It is to smear, fill, and drop electronic glue, oil or other liquids on the product, so that the product can stick and fill. , insulation, fixation, smooth surface and so on.

S9, scraping or dispensing transfer layer, the material of the gel electrolyte 3 used is an aqueous solution or an organic solution of potassium chloride, sodium chloride, lithium perchlorate, lithium hexafluorophosphate, lithium perchlorate, sodium perchlorate, etc. any one or more of them.

When it is necessary to increase the viscosity of the ion transport layer, polymer materials including polyacrylamide, polyvinyl alcohol, polyethylene glycol, polymethyl methacrylate and the like can be appropriately added.

The solvent of the organic solution is preferably any one of propylene carbonate, ethylene carbonate, N-methylpyrrolidone, and a mixture of at least two of them.

S10, vacuum defoaming, vacuum degree ≤ -50kPa, defoaming time is 8min ~ 120min.

S11. Encapsulation glue, preferably RTV glue, and then print the RTV glue on the periphery of the dam glue 2 of layer A through a glue dispensing process.

RTV is the abbreviation of room temperature vulcanized silicone rubber, that is, silicone rubber that can be vulcanized at room temperature. RTV glue has a long storage period and stable performance. It can bond common metal and non-metal materials. It is suitable for bonding and sealing between various metals, metal and non-metal materials.

S12. Device packaging: attach layer B to layer A under vacuum conditions, the vacuum degree is <-100kPa, so that the transmission layer is slowly covered during the contact with the surface of layer B, and the RTV glue of layer A is adhered, and finally through ultraviolet light Or heat cure RTV glue.

The invention also provides the large-area PEDOT electrochromic device prepared by the method. See Figure 2.

The large-area PEDOT-based electrochromic device provided by the present invention and its preparation method will be further described below in conjunction with the examples.

Example 1

A method for preparing a large-area PEDOT type electrochromic device, comprising the following steps:

S1. Material preparation: Cut the electroplating substrate into the required area, and the cutting area is determined by the actual electroplating area.

The electroplating substrate is a transparent ITO conductive film with a thickness of 110 μm.

S2. Pre-cleaning: Use a cleaning solution to clean the electroplating substrate to improve cleanliness.

The cleaning solution is acetone, ethanol and water; the cleaning sequence is acetone, ethanol, water; the cleaning time is 1min.

S3. Aging: putting the electroplating substrate into an oven for aging and baking.

The aging temperature is 120° C., and the aging time is 50 minutes.

S4. Adhesive protection: After the aging is completed, a protective adhesive is attached to the electroplating substrate, and the pattern electroplating is reserved.

The protective glue is rectangular, and the peripheral length and width are 80cm and 60cm respectively.

S5. Electroplating: A layer of electrochromic layer 1 and B layer of ion storage layer 4 are respectively electrodeposited on the electroplating substrate.

The material of the electrochromic layer 1 of layer A is PEDOT. During electroplating, an instantaneous high voltage of 5V is first applied for 15s, and then the current density is quickly changed to 0.3mAcm ^-2 , and the electroplating time is 150s. The ion storage layer 4 of layer B is made of PB, the applied current density is 0.05mAcm ^-2 , and the electroplating time is 150s.

The electrochromic layer 1 of the layer A is symmetrical to the ion storage layer 4 of the layer B.

During the electroplating process, the distance between the working electrode and the counter electrode of the electrochromic layer 1 of layer A and the ion storage layer 4 of layer B is 1 cm.

After the electroplating is completed, the electroplating substrate is taken out of the electrolytic tank, soaked in ethanol and deionized water for 1 min, and then vacuum-dried at 60°C for 1 h, and the vacuum degree is greater than 100 kPa. Then peel off the protective glue to expose the unplated area.

S6. Printing wires: Print the A-layer and B-layer lines, and print the conductive liquid according to the designed lines.

Print the wire to the non-plated area to connect the plated substrate and external equipment, and print the conductive liquid according to the designed circuit, and the conductive liquid is silver paste.

The width of the printed circuit is 0.5 mm, the speed of the scraper is 100 mms ^-1 , and the mesh number of the screen is 300 mesh.

S7. Wire curing: put the printed layer A and layer B into an oven for curing.

The curing temperature of the silver paste wire is 60°C, and the curing time is 50 minutes.

S8. Dam glue: Print Dam glue on layer A by dispensing process, and UV or heat curing to form the dam.

The thickness of the dam glue 2 is 120 μm.

S9. Scrape-coating the transmission layer: drop the gel electrolyte 3 into the groove formed by the dam glue 2 of layer A, and scrape it evenly so that the thickness of the transmission layer is the same as that of the dam glue 2.

A 0.1M lithium perchlorate propylene carbonate solution was selected as the gel electrolyte 3, and 25 wt.% polymethyl methacrylate was added to increase the viscosity of the gel electrolyte 3. The speed was set at 10mms ^-1 when scraping.

S10. Vacuum defoaming: performing vacuum defoaming on the gel electrolyte 3 .

The vacuum degree of vacuum defoaming is -60kPa, and the defoaming time is 10min.

S11. Encapsulation glue: print the RTV glue on the periphery of the dam glue 2 of layer A through the dispensing process, and make the thickness of the encapsulation glue the same as that of the dam glue 2 .

S12. Device packaging: attach the B layer to the A layer electrochromic layer 1 under vacuum conditions, the vacuum degree is <-100kPa, so that the transport layer gel electrolyte 3 and the B layer ion storage layer 4 are slowly covered during the contact process, Exhaust the air bubbles, and adhere the A-layer RTV glue, and finally cure the RTV glue by UV or heat.

This embodiment also provides a large-area PEDOT electrochromic device prepared by the method.

Example 2

A method for preparing a large-area PEDOT type electrochromic device, comprising the following steps:

S1. Material preparation: Cut the electroplating substrate into the required area, and the cutting area is determined by the actual electroplating area.

The electroplating substrate is transparent FTO conductive glass with a thickness of 1.8mm.

S2. Pre-cleaning: Use a cleaning solution to clean the electroplating substrate to improve cleanliness.

The cleaning solution is acetone, ethanol and water; the cleaning sequence is acetone, ethanol, water; the cleaning time is 0.5min.

S3. Aging: putting the electroplating substrate into an oven for aging and baking.

The aging temperature is 60° C., and the aging time is 60 minutes.

S4. Adhesive protection: After the aging is completed, a protective adhesive is attached to the electroplating substrate, and the pattern electroplating is reserved.

The protective glue is rectangular, and the peripheral length and width are 100cm and 70cm respectively.

S5. Electroplating: A layer of electrochromic layer 1 and B layer of ion storage layer 4 are respectively electrodeposited on the electroplating substrate.

The material of the electrochromic layer 1 of layer A is PEDOT. During electroplating, an instantaneous high voltage of 6V is first applied for 10s, and then the current density is quickly changed to 0.25mAcm ^-2 , and the electroplating time is 200s. The ion storage layer 4 of layer B is made of PB, the applied current density is 0.01mAcm ^-2 , and the electroplating time is 200s.

The electrochromic layer 1 of the layer A is symmetrical to the ion storage layer 4 of the layer B.

During the electroplating process, the distance between the working electrode and the counter electrode of the electrochromic layer 1 of layer A and the ion storage layer 4 of layer B is 2 cm.

After the electroplating is completed, take the electroplating substrate out of the electrolytic tank, soak and wash it in ethanol and deionized water for 5 minutes, and then vacuum-dry it at 70°C for 1.5 hours, and the vacuum degree is greater than 100kPa; then peel off the protective glue and expose out of the unplated area.

S6. Printing wires: Print the A-layer and B-layer lines, and print the conductive liquid according to the designed lines.

Print the wire to the non-plated area to connect the plated substrate and external equipment, and print the conductive liquid according to the designed circuit, and the conductive liquid is copper paste.

The width of the printed circuit is 0.1 mm, the speed of the scraper is 10 mms ^-1 , and the mesh number of the screen is 50 mesh.

S7. Wire curing: put the printed layer A and layer B into an oven for curing.

The curing temperature of the copper paste wire is 130°C, and the curing time is 60 minutes.

S8. Dam glue: Print Dam glue on layer A by dispensing process, and then form the dam by UV or heat curing.

The thickness of the dam glue 2 is 200 μm.

S9. Glue dispensing transfer layer: Dispense the gel electrolyte 3 into the dam adhesive 2 of layer A, so that the thickness of the transfer layer is the same as that of the dam adhesive 2 .

A 0.1M lithium perchlorate solution in propylene carbonate was selected as the gel electrolyte 3 . The speed is set at 80mms ^-1 when scraping.

S10. Vacuum defoaming: performing vacuum defoaming on the gel electrolyte 3 .

The vacuum degree of vacuum defoaming is -80kPa, and the defoaming time is 60min.

S11. Encapsulation glue: print the RTV glue on the periphery of the dam glue 2 of layer A through the dispensing process, and make the thickness of the encapsulation glue the same as that of the dam glue 2 .

S12. Device packaging: attach the B layer to the A layer electrochromic layer 1 under vacuum conditions, the vacuum degree is <-100kPa, so that the transport layer gel electrolyte 3 and the B layer ion storage layer 4 are slowly covered during the contact process, Exhaust the air bubbles, and adhere the A-layer RTV glue, and finally cure the RTV glue by UV or heat.

This embodiment also provides a large-area PEDOT electrochromic device prepared by the method.

Example 3

A method for preparing a large-area PEDOT type electrochromic device, comprising the following steps:

S1. Material preparation: Cut the electroplating substrate into the required area, and the cutting area is determined by the actual electroplating area.

The electroplating substrate is transparent ZTO conductive glass with a thickness of 1.8mm.

S2. Pre-cleaning: Use a cleaning solution to clean the electroplating substrate to improve cleanliness.

The cleaning solution is acetone, ethanol and water; the cleaning sequence is acetone, ethanol, water; the cleaning time is 5 minutes.

S3. Aging: putting the electroplating substrate into an oven for aging and baking.

The aging temperature is 150° C., and the aging time is 120 minutes.

S4. Adhesive protection: After the aging is completed, a protective adhesive is attached to the electroplating substrate, and the pattern electroplating is reserved.

The protective glue is rectangular, and the peripheral length and width are 90cm and 80cm respectively.

S5. Electroplating: A layer of electrochromic layer 1 and B layer of ion storage layer 4 are respectively electrodeposited on the electroplating substrate.

The material of the electrochromic layer 1 of layer A is PEDOT. During electroplating, an instantaneous high voltage of 4V is first applied for 5s, and then the current density is quickly changed to 0.5mAcm ^-2 , and the electroplating time is 100s. The ion storage layer 4 of layer B is made of PB, the applied current density is 0.1 mAcm ⁻² , and the electroplating time is 100 s.

The electrochromic layer 1 of the layer A is symmetrical to the ion storage layer 4 of the layer B.

During the electroplating process, the distance between the working electrode and the counter electrode of the electrochromic layer 1 of layer A and the ion storage layer 4 of layer B is 3 cm.

After the electroplating is completed, take the electroplating substrate out of the electrolytic tank, soak and wash it in ethanol and deionized water for 10 minutes, and then vacuum dry it at 80°C for 2 hours, and the vacuum degree is greater than 100kPa; then peel off the protective glue to expose unplated area.

S6. Printing wires: Print the A-layer and B-layer lines, and print the conductive liquid according to the designed lines.

Print the wire to the non-plated area to connect the plated substrate and external equipment, and print the conductive liquid according to the designed circuit, and the conductive liquid is carbon paste.

The width of the printed circuit is 5 mm, the speed of the scraper is 150 mms ^-1 , and the mesh number of the screen is 500 mesh.

S7. Wire curing: put the printed layer A and layer B into an oven for curing.

The curing temperature of the carbon paste wire is 120°C, and the curing time is 30 minutes.

S8. Dam glue: Print Dam glue on layer A by dispensing process, and then form the dam by UV or heat curing.

The thickness of the dam glue 2 is 250 μm.

S9. Scrape coating/dispensing transfer layer: drop the gel electrolyte 3 into the groove formed by the dam adhesive 2 of the A layer, and scrape it evenly; or dispense the gel electrolyte 3 into the dam adhesive 2 of the A layer, Make the transfer layer the same thickness as the dam glue 2 thickness.

A 0.1M lithium perchlorate solution in propylene carbonate was selected as the gel electrolyte 3 . The speed is set at 20mms ^-1 when scraping.

S10. Vacuum defoaming: performing vacuum defoaming on the gel electrolyte 3 .

The vacuum degree of vacuum defoaming is -90kPa, and the defoaming time is 30min.

S11. Encapsulation glue: print the RTV glue on the periphery of the dam glue 2 of layer A through the dispensing process, and make the thickness of the encapsulation glue the same as that of the dam glue 2 .

S12. Device packaging: attach layer B to layer A under vacuum conditions, and the vacuum degree is <-100kPa, so that the gel electrolyte 3 of the transport layer and the ion storage layer 4 of layer B are slowly covered during the contact process, and air bubbles are discharged and adhered A layer of RTV glue, and finally cure the RTV glue by UV or heat.

This embodiment also provides a large-area PEDOT electrochromic device prepared by the method.

The large-area PEDOT-type electrochromic device and its preparation method provided by the present invention can solve the difficulty in obtaining a uniform and high-quality PEDOT film when preparing a large-area PEDOT-type electrochromic device in the existing electroplating process mentioned in the background art , resulting in a significant decrease in the yield rate and a substantial increase in costs.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (10)

1. a preparation method of large-area PEDOT class electrochromic device, is characterized in that, described method comprises: S1, material preparation: cutting the electroplating substrate; S2. Pre-cleaning: use a cleaning solution to clean the electroplating substrate; S3, aging: aging the electroplating substrate by baking; S4. Adhesive protection: After the aging is completed, a protective adhesive is attached to the electroplating substrate, and the pattern electroplating is reserved; S5. Electroplating: electro-deposit an electrochromic layer A and an ion storage layer B on the electroplating substrate; S6. Printed wires: Print A-layer and B-layer lines; S7. Wire curing: bake and cure the printed A layer and B layer; S8. Dam glue: Print the Dam glue on the A layer through the dispensing process, and then form the dam by UV or heat curing; S9. Scratch coating or dispensing transfer layer: drop the gel electrolyte into the groove formed by the dam adhesive of layer A, and scrape it flat; or dispense the gel electrolyte into the dam adhesive of layer A to make the thickness of the transfer layer Same thickness as the dam glue; S10. Vacuum defoaming: vacuum defoaming the gel electrolyte; S11. Encapsulation glue: print the encapsulation glue on the periphery of the A-layer dam glue through the dispensing process, and make the thickness of the encapsulation glue the same as that of the dam glue; S12. Device encapsulation: attach layer B to layer A under vacuum conditions, cover the transmission layer during the contact with the surface of layer B, and adhere the encapsulation glue of layer A, and finally cure the encapsulation glue by ultraviolet or heating. 2. the preparation method of large-area PEDOT type electrochromic device as claimed in claim 1, is characterized in that, described electroplating substrate is any one in transparent ITO, AZO, FTO conductive glass or conductive film. 3. the preparation method of large-area PEDOT type electrochromic device as claimed in claim 1, is characterized in that, described cleaning liquid is acetone, ethanol and water; Clean electroplating substrate by the order of acetone, ethanol, water. 4. the preparation method of large-area PEDOT class electrochromic device as claimed in claim 1 is characterized in that, described electroplating, the material of A layer electrochromic layer is PEDOT, adds instantaneous high voltage earlier when electroplating, then Change the current density to continue electroplating; the material of the ion storage layer of the B layer is PB, and directly apply the current for electroplating. 5. The preparation method of a large-area PEDOT electrochromic device as claimed in claim 4, characterized in that, in the electroplating, the A-layer electrochromic layer is axisymmetric to the B-layer ion storage layer. 6. the preparation method of large-area PEDOT class electrochromic device as claimed in claim 4 is characterized in that, described electroplating, after finishing, electroplating substrate is taken out from electrolyzer, in ethanol, deionized water successively Soak and clean, then vacuum dry, and then peel off the protective glue to expose the unplated area. 7. the preparation method of large-area PEDOT class electrochromic device as claimed in claim 1, is characterized in that, described printed wire is that wire is printed to non-electroplated area, to connect electroplating substrate and external equipment, and according to The designed circuit is printed with conductive liquid; the conductive liquid is any one of silver paste, copper paste or carbon paste; after printing, layer A and layer B are placed in an oven to cure. 8. The preparation method of large-area PEDOT electrochromic devices as claimed in claim 1, wherein the gel electrolyte is made of potassium chloride, sodium chloride, lithium perchlorate, lithium hexafluorophosphate , lithium perchlorate, sodium perchlorate aqueous solution or any one or more of organic solutions; when it is necessary to increase the viscosity of the ion transport layer, add polyacrylamide, polyvinyl alcohol, polyethylene glycol, polyformaldehyde Polymer materials based on methyl acrylate. 9. the preparation method of large-area PEDOT class electrochromic device as claimed in claim 8, is characterized in that, described organic solution, the solvent that adopts is in propylene carbonate, ethylene carbonate, N-methylpyrrolidone Any one and a mixture of at least two of them. 10. A large-area PEDOT-based electrochromic device prepared by the method according to any one of claims 1-9.

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