Electrochromic device, preparation method thereof and electronic equipment

Abstract

The invention provides an electrochromic device, a preparation method thereof and electronic equipment. The preparation method comprises the steps that a first flexible base material is attached to a first supporting plate; wherein the first flexible base material comprises a first flexible substrate and a first electrode layer; a second flexible base material is attached to the second supporting plate; wherein the second flexible base material comprises a second flexible substrate and a second electrode layer; the first electrode layer of the first flexible base material and the second electrode layer of the second flexible base material are matched in a counterpoint mode, glue dispensing sealing is conducted on the circumference, and a containing cavity is formed; and an electrochromic material is poured into the containing cavity, and the containing cavity is sealed. According to the preparation method of the electrochromic device, the supporting plate is used as a support, packaging of the flexible base material electrochromic device can be achieved, and the preparation method has the advantages of being simple in process and reliable in packaging.

Description

Technical Field

[0001] This application relates to the technical field of electrochromic device fabrication process, specifically to an electrochromic device and its fabrication method, and electronic equipment. Background Technology

[0002] Currently, electrochromic devices on the market, such as photochromic glass or photochromic housings, generally use glass as the substrate, still relying on traditional glass bases to ensure effective liquid filling. While the manufacturing process and technology for glass-based photochromic devices are relatively mature, the use of a glass substrate means the finished product cannot be bent, posing a certain safety hazard in sports eyewear (such as cycling glasses and ski goggles). Due to its inability to achieve flexibility, it cannot be widely used in fields such as smart glasses. Summary of the Invention

[0003] The first aspect of this application provides a method for fabricating an electrochromic device, the method comprising: A first flexible substrate is attached to a first support plate; wherein the first flexible substrate includes a first flexible substrate and a first electrode layer; A second flexible substrate is attached to a second support plate; wherein, the second flexible substrate includes a second flexible substrate and a second electrode layer; The first electrode layer of the first flexible substrate is aligned and fitted with the second electrode layer of the second flexible substrate, and then sealed with adhesive around the circumference to form a receiving cavity; Electrochromic material is injected into the cavity and then sealed.

[0004] In some optional embodiments, the electrochromic material includes a solvent, a cathode material, an anode material, a framework material, and a curing agent; wherein the cathode material is violet; and the chemical structural formula of the anode material is as follows:

[0005] Wherein, R1, R2, R3, and R4 are the same or different alkyl groups; R5 and R6 are the same or different functional groups; R5 and R6 are straight-chain or branched alkanes, halogen elements, carboxylic acid esters, or cyano groups consisting of 1 to 4 carbon atoms. X is any one of the following anions: halogen, F-, Cl-, Br-, I-, BF4-, CF3SO3-, (CF3SO2)2N-.

[0006] In some optional embodiments, the skeleton material includes any one of polymethyl methacrylate, epoxy resin, and polyurethane acrylate; the curing agent includes any one or more of hydroxyethyl acrylate, isocyanate, acrylate and its derivatives; the content of the skeleton material is 2-10% of the mass percentage of the electrochromic material; the content of the curing agent is 0.05-1% of the mass percentage of the electrochromic material; and the solvent is polycarbonate.

[0007] In some optional embodiments, the electrochromic material further includes an initiator, the initiator being present in an amount of 0.05-1% of the electrochromic material by mass.

[0008] In some optional embodiments, the preparation method further includes heating or irradiating the encapsulated electrochromic device to transform the liquid electrochromic material into a gel state.

[0009] In some optional embodiments, the first flexible substrate is attached to the first support plate by means of an optical / thermal anti-adhesion film; the second flexible substrate is attached to the second support plate by means of an optical / thermal anti-adhesion film.

[0010] In some optional embodiments, the first flexible substrate further includes a first water and oxygen barrier film, which is optically bonded to the side of the first flexible substrate opposite to the first electrode layer; the second flexible substrate further includes a second water and oxygen barrier film, which is optically bonded to the side of the second flexible substrate opposite to the second electrode layer.

[0011] In some optional embodiments, in the step of aligning and fitting the first electrode layer of the first flexible substrate with the second electrode layer of the second flexible substrate and sealing them with adhesive around the periphery to form a receiving cavity, the opposite sides of the adhesive are respectively bonded to the first water-oxygen barrier film and the second water-oxygen barrier film, and the adhesive portion extends into the receiving cavity.

[0012] Secondly, this application provides an electrochromic device, which is prepared using the preparation method described in the above embodiments.

[0013] Thirdly, embodiments of this application provide an electronic device that uses the electrochromic device described in the above embodiments to change color or block out colors. The electronic device includes any one of a mobile phone, a tablet computer, smart glasses, and a wearable device.

[0014] The method for fabricating electrochromic devices provided in this application embodiment utilizes a support plate as a support to achieve the encapsulation of flexible substrate electrochromic devices, which has the characteristics of simple process and reliable encapsulation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of an embodiment of the method for preparing the electrochromic device of this application; Figure 2 This is a schematic diagram of the structure after the first flexible substrate is attached to the first support plate in an embodiment of this application; Figure 3 This is a schematic diagram of the structure after the first flexible substrate and the second flexible substrate are aligned and bonded in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of an embodiment of the electrochromic device of this application; Figure 5 This is a schematic flowchart of another embodiment of the method for preparing the electrochromic device of this application; Figure 6 This is another structural schematic diagram of the first flexible substrate and the second flexible substrate after alignment and bonding in the embodiments of this application; Figure 7 This is a schematic diagram of another embodiment of the electrochromic device of this application; Figure 8 This is a schematic diagram of another embodiment of the fabrication process of the electrochromic device of this application; Figure 9 This is a schematic diagram of the fabrication process of the electrochromic device of this application and another embodiment. Figure 10 This is a schematic diagram of another embodiment of the fabrication process of the electrochromic device of this application. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0018] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] As used herein, “electronic device” (or simply “terminal”) includes, but is not limited to, means configured to receive / transmit communication signals via a wired connection (such as via a Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital Cable, Direct Cable Connection, and / or another data connection / network) and / or via a wireless interface (e.g., for a cellular network, Wireless Local Area Network (WLAN), Digital Television Network such as DVB-H, Satellite Network, AM-FM Broadcast Transmitter, and / or another communication terminal). A communication terminal configured to communicate via a wireless interface may be referred to as a “wireless communication terminal,” a “wireless terminal,” or a “mobile terminal.” Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that may combine cellular radiotelephone with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. A mobile phone is an electronic device equipped with a cellular communication module.

[0021] First, this application provides a method for fabricating an electrochromic device. Please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic flowchart of an embodiment of the preparation method of the electrochromic device of this application, which includes, but is not limited to, the following steps.

[0022] Step S100: The first flexible substrate is attached to the first support plate.

[0023] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure after the first flexible substrate is attached to the first support plate in an embodiment of this application. The first flexible substrate 100 is attached to the first support plate 100a via a light / heat-resistant adhesive film 101. The function of the light (e.g., UV light) / heat-resistant adhesive film 101 is to facilitate the peeling off of the first support plate 100a after the electrochromic device is encapsulated. The first support plate 100a can be made of materials such as a glass substrate or a stainless steel plate.

[0024] Optionally, the first flexible substrate 100 in this embodiment includes a first flexible substrate 110 and a first electrode layer 120 stacked together.

[0025] Step S200: The second flexible substrate is attached to the second support plate.

[0026] The second flexible substrate 200 can also be attached to the second support plate 100b via an optical / thermal anti-adhesion film 101. The second support plate 100b can be made of materials such as a glass substrate or a stainless steel plate. Optionally, in this embodiment, the second flexible substrate 200 includes a second flexible substrate 210 and a second electrode layer 220.

[0027] The first flexible substrate 110 and the second flexible substrate 210 can be made of flexible transparent resin material, thus making the overall structure of the electrochromic device flexible and bendable. The first flexible substrate 110 and the second flexible substrate 210 serve to support and protect the internal structure. In some embodiments, the first flexible substrate 110 and the second flexible substrate 210 can be made of PET (Polyethylene terephthalate, abbreviated as PET or PEIT, commonly known as polyester resin, a condensation polymer of terephthalic acid and ethylene glycol), PMMA (poly(methyl methacrylate)), also known as acrylic, plexiglass, PC (Polycarbonate, a high molecular polymer containing carbonate groups in its molecular chain), PI (Polyimide), etc. More material types for the first flexible substrate 110 and the second flexible substrate 210 are beyond the understanding of those skilled in the art and will not be listed or described in detail here. The formation method of the first electrode layer 120 and the second electrode layer 220 can be physical vapor deposition (PVD), specifically including vacuum evaporation, sputtering, ion plating (hollow cathode ion plating, hot cathode ion plating, arc ion plating, reactive ion plating, radio frequency ion plating, DC discharge ion plating), etc.

[0028] The thicknesses of the first electrode layer 120 and the second electrode layer 220 can be between 100nm and 300nm, specifically 100nm, 120nm, 150nm, 200nm, 280nm, and 300nm. The first electrode layer 120 and the second electrode layer 220 are made of transparent conductive materials. These transparent conductive materials can be indium tin oxide (ITO), zinc aluminum oxide (AZO), fluorine-doped tin oxide (FTO), or graphene films, etc.

[0029] Optionally, in this embodiment, the first electrode layer 120 and the second electrode layer 220 can be made of ITO. The sheet resistance of ITO is 1-30Ω. In some embodiments, it can be 5-20Ω, and in some preferred embodiments, it can be 10±2Ω, specifically values ​​such as 8Ω, 8.5Ω, 8.6Ω, 9Ω, 9.3Ω, 10Ω, 10.5Ω, 10.8Ω, 11Ω, 11.7Ω, and 12Ω.

[0030] In step S300, the first electrode layer of the first flexible substrate is aligned and fitted with the second electrode layer of the second flexible substrate, and then sealed with adhesive around the periphery to form a receiving cavity.

[0031] Please see Figure 3, Figure 3 This is a schematic diagram of the structure after the first flexible substrate and the second flexible substrate are aligned and bonded in the embodiments of this application. In the figure, reference numeral 102 represents the adhesive frame and reference numeral 1000 represents the receiving cavity.

[0032] Optionally, the thickness T (i.e., the box thickness) of the receiving cavity 1000 can be 0.1-0.5 mm, and in some preferred embodiments it is 0.2 ± 0.05 mm, specifically 0.15 mm, 0.16 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.25 mm, etc.

[0033] Step S400: Inject electrochromic material into the cavity and seal it.

[0034] In addition, the preparation method in this application embodiment also includes the steps of peeling off the first support plate 100a and the second support plate 100b, and the step of setting conductive electrodes, etc. Please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is a schematic diagram of the structure of an embodiment of the electrochromic device of this application, wherein the electrochromic material 103 can be selected from organic polymers (including polyaniline, polythiophene, etc.), inorganic materials (Prussian blue, transition metal oxides, such as tungsten trioxide), and small organic molecules (violet).

[0035] Optionally, in one embodiment, the electrochromic material 103 may include a solvent, a cathode material, an anode material, a framework material, and a curing agent.

[0036] The chemical formula of the anode material is as follows:

[0037] Wherein, R1, R2, R3, and R4 are the same or different alkyl groups; Optionally, the alkyl groups of R1, R2, R3, and R4 are straight-chain or branched alkanes consisting of 1 to 10 carbon atoms.

[0038] R5 and R6 are the same or different functional groups; optionally, R5 and R6 can be straight-chain or branched alkanes composed of 1 to 4 carbon atoms, or halogen elements, or carboxylic acid esters, or cyano groups.

[0039] X is any one of the following anions: halogen, F-, Cl-, Br-, I-, BF4-, CF3SO3-, (CF3SO2)2N-.

[0040] Optionally, pyridine compounds include: alkylpyridine, halopyridine, aminopyridine, bromopyridine, methylpyridine, ethylpyridine, iodopyridine, chloropyridine, nitropyridine, hydroxypyridine, benzylpyridine, ethylpyridine, cyanopyridine, fluoropyridine, dihydropyridine, methyl carboxylate pyridine, etc. In one embodiment of this application, the pyridine compound may be 4-borate pyridine.

[0041] Alternatively, norbornene includes various derivatives, such as tetrabromonorbornene, 2,5-norbornene, tetrabromophenylhexachloronorbornene, etc.

[0042] In this embodiment of the electrochromic material, norbornene is used as the anode material to connect pyridines. Since norbornene has a stereobicyclic structure, it avoids the problem of π-π stacking easily occurring during electrochemical cycling due to the mutual attraction between the large π bonds of the benzene rings, which would cause the pyridine compounds to accumulate (or deposit) in the electrolyte after color change, resulting in a decrease in color depth or a lighter color. In addition, since the rigidity of norbornene and the conjugated olefin structure can connect multiple pyridine rings, the potential energy for the valence electrons in the molecule to jump to the excited state is relatively low, making it easier to achieve color change at a lower voltage and resulting in a higher color contrast at the same concentration.

[0043] The content of the anode material is 0.1-3% of the total mass of the electrochromic material.

[0044] The cathode material can be a small molecule material such as violet, with a content of 0.1-5% of the electrochromic material by mass.

[0045] The solvent can be polycarbonate (PC), and the water content must be less than 100 ppm.

[0046] The skeleton material includes any one of polymethyl methacrylate (PMMA), epoxy resin, and polyurethane acrylate; the content of the skeleton material is 2-10% of the mass percentage of the electrochromic material.

[0047] This application uses polymethyl methacrylate (PMMA) as a curing agent for illustration. Several factors need to be considered when determining the amount of PMMA added: too much will easily form a film, but will reduce stability and prevent infusion; too little will prevent the formation of a structural film, making bending impossible. Several sets of test data are shown in the table below.

[0048]

[0049] Therefore, in the material formulation of PMMA as a curing agent in the embodiments of this application, the preferred addition amount of PMMA is 5-9% by mass. This ensures process feasibility and meets the performance requirements of the product.

[0050] Optionally, the curing agent includes any one or more of the following: hydroxyethyl acrylate, isocyanate, acrylate and its derivatives, aliphatic polyamine, alicyclic polyamine, aromatic polyamine, phenol, acid anhydride, etc., and the content of the curing agent is 0.05-1% of the mass percentage of the electrochromic material.

[0051] Optionally, the electrochromic material in this embodiment may further include an initiator, the content of which is 0.05-1% of the mass percentage of the electrochromic material; the role of the initiator is to initiate the curing agent to produce a gel state, and the gel initiator may be a thermal or UV initiator, such as a cross-linked polymer obtained by cross-linking acrylic acid derivatives through ultraviolet light.

[0052] In addition, initiators may include: acyl peroxides (such as benzoyl peroxide, lauroyl peroxide), hydroperoxides (such as cumene hydroperoxide, tert-butyl hydroperoxide), dialkyl peroxides (such as di-tert-butyl peroxide, dicumyl peroxide), ester peroxides (such as tert-butyl peroxide, tert-butyl pervalerate), ketone peroxides (such as methyl ethyl ketone peroxide, cyclohexanone peroxide), dicarbonate peroxides (such as diisopropyl peroxide, dicyclohexyl peroxide), etc. The selection of initiator can be based on the curing agent and the skeleton material. Detailed characteristics of this part are within the understanding of those skilled in the art and will not be elaborated here.

[0053] In the scheme where the electrochromic material 103 is an organic small molecule (violetin as the cathode material), the concentration of the electrochromic material 103 is 55~65 mmol / L. Optionally, in a specific embodiment, the concentration of the electrochromic material 103 is 60±2 mmol / L, specifically it can be 58 mmol / L, 58.5 mmol / L, 58.8 mmol / L, 59 mmol / L, 59.3 mmol / L, 60 mmol / L, 60.5 mmol / L, 61 mmol / L, 62 mmol / L, etc.

[0054] Based on the above research on multiple parameters, the optimal optical combination parameters are as follows when the cathode material in the electrochromic material is an organic small molecule (violetin): A material concentration of 55-65 mmol / L is optimal, balancing optical performance; increasing the concentration reduces optical performance. A cell thickness of around 0.2 mm is optimal, as it is the most effective way to reduce power consumption; further increasing the cell thickness will significantly reduce the color-changing speed. A sheet resistance of around 10 Ω for ITO is optimal; if it is too high, the optical performance is very good, but the color-changing speed is very slow; if it is too low, it severely affects the optical performance.

[0055] The method for fabricating the electrochromic device in this application embodiment utilizes a support plate as a support to achieve the encapsulation of the flexible substrate electrochromic device, which has the characteristics of simple process and reliable encapsulation.

[0056] Please see Figure 5 , Figure 5 This is a schematic flowchart of another embodiment of the preparation method of the electrochromic device of this application, which includes, but is not limited to, the following steps.

[0057] Step S100: The first flexible substrate is attached to the first support plate.

[0058] Please see Figure 2 The first flexible substrate 100 can also be attached to the first support plate 100a via a light / heat-resistant adhesive film 101. The function of the light (e.g., UV light) / heat-resistant adhesive film 101 is to facilitate the peeling off of the first support plate 100a after the electrochromic device is encapsulated. The first support plate 100a can be made of materials such as glass substrate or stainless steel plate. The first flexible substrate 100 includes a first flexible substrate 110 and a first electrode layer 120 stacked together.

[0059] Step S200: The second flexible substrate is attached to the second support plate.

[0060] The second flexible substrate 200 can also be attached to the second support plate 100b via an optical / thermal anti-adhesion film 101. The second support plate 100b can be made of materials such as a glass substrate or a stainless steel plate. Optionally, in this embodiment, the second flexible substrate 200 includes a second flexible substrate 210 and a second electrode layer 220.

[0061] The first flexible substrate 110 and the second flexible substrate 210 can be made of flexible transparent resin material, thus making the overall structure of the electrochromic device flexible and bendable. The first flexible substrate 110 and the second flexible substrate 210 serve to support and protect the internal structure. In some embodiments, the first flexible substrate 110 and the second flexible substrate 210 can be made of PET (Polyethylene terephthalate, abbreviated as PET or PEIT, commonly known as polyester resin, a condensation polymer of terephthalic acid and ethylene glycol), PMMA (poly(methyl methacrylate)), also known as acrylic, plexiglass, PC (Polycarbonate, a high molecular polymer containing carbonate groups in its molecular chain), PI (Polyimide), etc. More material types for the first flexible substrate 110 and the second flexible substrate 210 are beyond the understanding of those skilled in the art and will not be listed or described in detail here. The formation method of the first electrode layer 120 and the second electrode layer 220 can be physical vapor deposition (PVD), specifically including vacuum evaporation, sputtering, ion plating (hollow cathode ion plating, hot cathode ion plating, arc ion plating, reactive ion plating, radio frequency ion plating, DC discharge ion plating), etc.

[0062] The thicknesses of the first electrode layer 120 and the second electrode layer 220 can be between 100nm and 300nm, specifically 100nm, 120nm, 150nm, 200nm, 280nm, and 300nm. The first electrode layer 120 and the second electrode layer 220 are made of transparent conductive materials. These transparent conductive materials can be indium tin oxide (ITO), zinc aluminum oxide (AZO), fluorine-doped tin oxide (FTO), or graphene films, etc.

[0063] Optionally, in this embodiment, the first electrode layer 120 and the second electrode layer 220 can be made of ITO. The sheet resistance of ITO is 1-30Ω. In some embodiments, it can be 5-20Ω, and in some preferred embodiments, it can be 10±2Ω, specifically values ​​such as 8Ω, 8.5Ω, 8.6Ω, 9Ω, 9.3Ω, 10Ω, 10.5Ω, 10.8Ω, 11Ω, 11.7Ω, and 12Ω.

[0064] In step S300, the first electrode layer of the first flexible substrate is aligned and fitted with the second electrode layer of the second flexible substrate, and then sealed with adhesive around the periphery to form a receiving cavity.

[0065] Please refer to the following: Figure 3 and Figure 6 , Figure 6 This is another structural schematic diagram of the first flexible substrate and the second flexible substrate after alignment and bonding in the embodiments of this application, wherein, Figure 3 and Figure 6 The difference lies in the position of the frame 102.

[0066] Optionally, the thickness T (i.e., the box thickness) of the receiving cavity 1000 can be 0.1-0.5 mm, and in some preferred embodiments it is 0.2 ± 0.05 mm, specifically 0.15 mm, 0.16 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.25 mm, etc.

[0067] Step S400: Inject electrochromic material into the cavity and seal it.

[0068] Similarly, the preparation method in this application embodiment also includes the step of peeling off the first support plate 100a and the second support plate 100b (when the first support plate 100a and the second support plate 100b are transparent glass substrates, this step can be performed later). See also... Figure 7 , Figure 7 This is a schematic diagram of another embodiment of the electrochromic device of this application. The electrochromic material 103 can be selected from organic polymers (including polyaniline, polythiophene, etc.), inorganic materials (Prussian blue, transition metal oxides, such as tungsten trioxide), and small organic molecules (violet). For specific material ratios, please refer to the relevant descriptions in the foregoing embodiments.

[0069] Please continue reading. Figure 5 The preparation method in this embodiment also includes step S500, which involves heating or irradiating the encapsulated electrochromic device to transform the liquid electrochromic material into a gel state.

[0070] Specifically, step S500 employs different initiation methods depending on the type of initiating gelling agent added.

[0071] Optionally, please refer to Figure 8 , Figure 8 This is a schematic diagram of another embodiment of the fabrication process of the electrochromic device of this application. Unlike the previous embodiment, the first flexible substrate 100 in this embodiment further includes a first water and oxygen barrier film 130, which is attached to the side of the first flexible substrate 110 away from the first electrode layer 120 by optical adhesive 131; the second flexible substrate 200 further includes a second water and oxygen barrier film 230, which is attached to the side of the second flexible substrate 210 away from the second electrode layer 220 by optical adhesive 231.

[0072] The first water-oxygen barrier membrane 130 and the second water-oxygen barrier membrane 230 can be made of flexible transparent resin materials, including polyethylene terephthalate (PET), polycarbonate (PC), and polyimide (PI). The first water-oxygen barrier membrane 130 and the second water-oxygen barrier membrane 230 can also be dense metal oxide layers, inorganic non-metallic layers, or composite layers of materials and inorganic materials. For example, alumina, silicon oxide, or multi-material laminated composite structures. The water vapor transmission rate (WVTR) of the first water-oxygen barrier membrane 130 and the second water-oxygen barrier membrane 230 is <10. -3 g / m 2 / day, the optimal value can reach 10 -6 g / m 2 / day. In this embodiment, the water vapor permeation direction of the water-oxygen barrier membrane is the physical characteristic of water vapor permeating from one side surface of the water-oxygen barrier membrane in the thickness direction and reaching the opposite side surface.

[0073] Please see Figure 9 , Figure 9 This is a schematic diagram of the fabrication process of the electrochromic device of this application in another embodiment. Unlike the previous embodiment, in this embodiment, the adhesive (frame) 102 is directly bonded to the first water and oxygen barrier film 130 and the second water and oxygen barrier film 230 on opposite sides, so that the water and oxygen barrier film and the frame together serve as a sealing interface.

[0074] Please see Figure 10 , Figure 10 This is a schematic diagram of another embodiment of the fabrication process of the electrochromic device of this application. Unlike the previous embodiment, in this embodiment, the dispensing 102 extends into the receiving cavity 1000 to seal the electrochromic material 103, preventing the optical adhesive layer (131, 231) from being corroded by the electrochromic material 103, and further improving the packaging reliability.

[0075] The electrochromic device in this application embodiment can be applied to the color-changing of the casing of electronic devices, wearable devices, etc., and can be used in conjunction with the lenses of ordinary glasses, AI / AR glasses, cycling glasses, ski goggles, diving goggles, etc. to achieve color-changing occlusion, etc. It has excellent optical properties, fast color change, high color contrast, and has very high application value.

[0076] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A method for preparing an electrochromic device, characterized in that, The preparation method includes: A first flexible substrate is attached to a first support plate; wherein the first flexible substrate includes a first flexible substrate and a first electrode layer; A second flexible substrate is attached to a second support plate; wherein, the second flexible substrate includes a second flexible substrate and a second electrode layer; The first electrode layer of the first flexible substrate is aligned and fitted with the second electrode layer of the second flexible substrate, and then sealed with adhesive around the circumference to form a receiving cavity; Electrochromic material is injected into the cavity and then sealed.

2. The preparation method according to claim 1, characterized in that, The electrochromic material comprises a solvent, a cathode material, an anode material, a framework material, and a curing agent; wherein the cathode material is violet; and the chemical structural formula of the anode material is as follows: Wherein, R1, R2, R3, and R4 are the same or different alkyl groups; R5 and R6 are the same or different functional groups; R5 and R6 are straight-chain or branched alkanes, halogen elements, carboxylic acid esters, or cyano groups consisting of 1 to 4 carbon atoms. X is any one of the following anions: halogen, F-, Cl-, Br-, I-, BF4-, CF3SO3-, (CF3SO2)2N-.

3. The preparation method according to claim 2, characterized in that, The skeleton material includes any one of polymethyl methacrylate, epoxy resin, and polyurethane acrylate; the curing agent includes any one or more of hydroxyethyl acrylate, isocyanate, acrylate and its derivatives; the content of the skeleton material is 2-10% of the mass percentage of the electrochromic material; the content of the curing agent is 0.05-1% of the mass percentage of the electrochromic material; and the solvent is polycarbonate.

4. The preparation method according to claim 3, characterized in that, The electrochromic material further includes an initiator, the content of which is 0.05-1% of the mass percentage of the electrochromic material.

5. The preparation method according to claim 4, characterized in that, The preparation method further includes heating or irradiating the encapsulated electrochromic device to transform the liquid electrochromic material into a gel state.

6. The preparation method according to claim 1, characterized in that, The first flexible substrate is attached to the first support plate via an optical / thermal anti-adhesion film; the second flexible substrate is attached to the second support plate via an optical / thermal anti-adhesion film.

7. The preparation method according to claim 6, characterized in that, The first flexible substrate further includes a first water and oxygen barrier film, which is attached to the side of the first flexible substrate away from the first electrode layer by optical adhesive; the second flexible substrate further includes a second water and oxygen barrier film, which is attached to the side of the second flexible substrate away from the second electrode layer by optical adhesive.

8. The preparation method according to claim 7, characterized in that, In the step of aligning and fitting the first electrode layer of the first flexible substrate with the second electrode layer of the second flexible substrate and sealing them with adhesive around the periphery to form a receiving cavity, the opposite sides of the adhesive are respectively bonded to the first water-oxygen barrier film and the second water-oxygen barrier film, and the adhesive portion extends into the receiving cavity.

9. An electrochromic device, characterized in that, The electrochromic device is prepared using the preparation method described in any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device uses the electrochromic device of claim 9 to change color or block, and the electronic device includes any one of mobile phones, tablets, smart glasses, and wearable devices.

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