Tandem type electrochromic device and display device

Abstract

The utility model discloses a series-connection type electrochromic device and a display device. The series-connection type electrochromic device comprises a first substrate and a second substrate, an ion storage layer disposed on the first substrate; an electrolyte layer disposed on the ion storage layer; the electrochromic layer is arranged on the electrolyte layer; and the second substrate is arranged on the electrochromic layer. According to the electrochromic device, when voltage is not applied to the first substrate and the second substrate, the whole device is in a transparent state, when negative voltage is applied, ions in the electrolyte layer enter the electrochromic layer to be oxidized, the whole device is converted into a blue non-transparent state from the transparent state, the near-infrared wave band can be regulated and controlled, and the near-infrared wave band can be adjusted and controlled. When a positive voltage is applied, ions in the electrochromic layer are reduced, the electrochromic device is converted from a blue opaque state to a neutral color opaque state, regulation and control of visible light wave bands can be achieved, and then the electrochromic device can meet the requirements of multi-scene application.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochromic devices, and particularly relates to a series-connected electrochromic device and a display device. Background Art

[0002] Electrochromic materials and devices have been widely used in the fields of smart windows, e-books, displays, and infrared camouflage because they can achieve color display under a relatively low driving voltage.

[0003] Existing electrochromic devices generally can only achieve one band of spectrum, so that electrochromic devices cannot meet the requirements of multi-scene applications.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Utility Model

[0005] In view of the above deficiencies of the existing technology, the purpose of the present utility model is to provide a series-connected electrochromic device and a display device, so as to solve the problem that existing electrochromic devices generally can only achieve one band of spectrum, resulting in electrochromic devices being unable to meet the requirements of multi-scene applications.

[0006] The technical solution of the present utility model is as follows:

[0007] In a first aspect, the present utility model provides a series-connected electrochromic device, which includes:

[0008] A first substrate;

[0009] An ion storage layer, disposed on the first substrate;

[0010] An electrolyte layer, disposed on the ion storage layer;

[0011] An electrochromic layer, disposed on the electrolyte layer;

[0012] A second substrate, disposed on the electrochromic layer; [[ID=!42]]

[0013] The electrochromic layer is used to regulate the near-infrared band when a negative voltage is applied between the first substrate and the second substrate, and is also used to regulate the visible light band when a positive voltage is applied between the first substrate and the second substrate.

[0014] In a further setting of the present utility model, the electrochromic layer includes:

[0015] A cathode electrochromic layer, disposed on the electrolyte layer;

[0016] A transparent conductive layer, disposed on the cathode electrochromic layer;

[0017] The anode electrochromic layer is arranged on the transparent conductive layer.

[0018] According to a further configuration of the present invention, the cathode electrochromic layer has a permeable pore structure; the transparent conductive layer has a permeable pore structure; and the anode electrochromic layer has a permeable pore structure.

[0019] According to a further configuration of the present invention, the first substrate, the anode electrochromic layer, the transparent conductive layer and the cathode electrochromic layer constitute an electrochromic layer; and the second substrate and the ion storage layer constitute a counter electrode.

[0020] According to a further configuration of the present invention, the series electrochromic device also includes: a conductive substrate, a first copper conductive wire and a second copper conductive wire; the first copper conductive wire and the second copper conductive wire are arranged on the conductive substrate; the first substrate is connected to the first copper conductive wire, and the second substrate is connected to the second copper conductive wire.

[0021] According to a further configuration of the present invention, the transparent conductive layer includes a transparent glass layer and a conductive layer arranged on the surface of the transparent glass layer; the conductive layer is an indium tin oxide conductive layer, a fluorine-doped tin oxide conductive layer, an aluminum-doped zinc oxide conductive layer, a silver nanowire conductive layer, a graphene conductive layer or a carbon nanotube conductive layer.

[0022] In a further configuration of the present invention, the anode electrochromic layer is a metal oxide electrochromic layer.

[0023] In a further configuration of the present invention, the cathode electrochromic layer is a metal oxide electrochromic layer.

[0024] According to a further configuration of the present invention, the thickness of the first substrate is 1.1-2 mm; the thickness of the second substrate is 1.1-2 mm.

[0025] In a second aspect, the present invention further provides a display device comprising the series-connected electrochromic device as described above.

[0026] A tandem electrochromic device and a display device provided by the present utility model. The tandem electrochromic device includes: a first substrate; an ion storage layer disposed on the first substrate; an electrolyte layer disposed on the ion storage layer; an electrochromic layer disposed on the electrolyte layer; a second substrate disposed on the electrochromic layer; the electrochromic layer is configured to regulate the near-infrared band when a negative voltage is applied between the first substrate and the second substrate, and is further configured to regulate the visible light band when a positive voltage is applied between the first substrate and the second substrate. When no voltage is applied between the first substrate and the second substrate of the electrochromic device provided by the present utility model, the entire device is in a transparent state. When a negative voltage is applied between the first substrate and the second substrate, ions in the electrolyte layer enter the electrochromic layer and are oxidized, and the entire device changes from a transparent state to a blue opaque state, enabling the regulation of the near-infrared band. When a positive voltage is applied between the first substrate and the second substrate, the ions in the electrochromic layer are reduced, and the electrochromic device changes from a blue opaque state to a neutral color opaque state, enabling the regulation of the visible light band. Furthermore, the electrochromic device can meet the requirements of multi-scenario applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic diagram of the layer structure of the tandem electrochromic device in the present utility model.

[0029] Figure 2 It is a working principle diagram of the tandem electrochromic device in the present utility model.

[0030] Figure 3 A schematic diagram of the working circuit of the tandem electrochromic device.

[0031] Reference numerals in the drawings: 1, first substrate; 2, ion storage layer; 3, electrolyte layer; 4, electrochromic layer; 41, cathode electrochromic layer; 42, transparent conductive layer; 43, anode electrochromic layer; 5, second substrate; 6, conductive substrate; 7, first copper wire; 8, second copper wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present utility model provides a series-connected electrochromic device and a display device. To make the objectives, technical solutions and effects of the present utility model clearer and more definite, the following further elaborates on the present utility model with reference to the attached drawings and by way of examples. It should be understood that the specific embodiments described herein are merely used to explain the present utility model and are not intended to limit the present utility model.

[0033] In the embodiments and the scope of the patent application, unless otherwise specifically defined in the text for articles, the words "a", "an", "the" and "said" may also include the plural form. If there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0034] It should be further understood that the term "comprising" used in the description of the present utility model means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more of the associated listed items.

[0035] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art and will not be interpreted with an idealized or overly formal meaning unless specifically defined as herein.

[0036] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] Through research by the inventors, it has been found that the color and band adjustment of a single electrochromic material are relatively limited, which may hinder its practical application. In existing electrochromic technologies, tunable multifunctional devices can be achieved through multilayer structure design. However, due to the lack of a suitable assembly strategy or electrochromic material layer, the combination of complementary electrochromic materials is currently lacking. Therefore, how to achieve multi-band spectral regulation through the design of a multi-level electrochromic electrode structure to meet the requirements of multi-scenario applications of electrochromic devices has become an urgent problem to be solved in this field.

[0038] In view of the above technical problems, the present utility model provides a series-connected electrochromic device and a display device. The series-connected electrochromic device includes: a first substrate; an ion storage layer disposed on the first substrate; an electrolyte layer disposed on the ion storage layer; an electrochromic layer disposed on the electrolyte layer; and a second substrate disposed on the electrochromic layer. When no voltage is applied between the first substrate and the second substrate of the electrochromic device provided by the present utility model, the entire device is in a transparent state. When a negative voltage is applied between the first substrate and the second substrate, ions in the electrolyte layer enter the electrochromic layer and are oxidized, and the entire device changes from a transparent state to a blue opaque state, enabling the regulation of the near-infrared band. When a positive voltage is applied between the first substrate and the second substrate, the ions in the electrochromic layer are reduced, and the electrochromic device changes from a blue opaque state to a neutral-color opaque state, enabling the regulation of the visible light band. Thus, the electrochromic device can meet the requirements of multi-scenario applications.

[0039] Please also refer to Figures 1 to 3 , the present utility model provides a preferred embodiment of a series-connected electrochromic device.

[0040] In some embodiments, the present utility model provides a series-connected electrochromic device, as Figure 1 shown in Figure 2 , which includes: a first substrate 1, an ion storage layer 2, an electrolyte layer 3, an electrochromic layer 4, and a second substrate 5. Among them, the ion storage layer 2 is disposed on the first substrate 1; the electrolyte layer 3 is disposed on the ion storage layer 2; the electrochromic layer 4 is disposed on the electrolyte layer 3; the second substrate 5 is disposed on the electrochromic layer 4; the electrochromic layer 4 is used to regulate the near-infrared band when a negative voltage is applied between the first substrate 1 and the second substrate 5, and is also used to regulate the visible light band when a positive voltage is applied between the first substrate 1 and the second substrate 5.

[0041] Specifically, the first substrate 1, the ion storage layer 2, the electrolyte layer 3, the electrochromic layer 4, and the second substrate 5 are stacked and distributed in sequence from bottom to top. Among them, the first substrate 1 and the ion storage layer 2 form a counter electrode, and the second substrate 5 and the electrochromic layer 4 form an electrochromic electrode. The electrolyte layer 3 can be, but is not limited to, a gel-like layer structure composed of cellulose, polyol solvents, and salt solutions. The ion storage layer 2 has a compound capable of undergoing an electrochemical oxidation-reduction reaction. The first substrate 1 and the second substrate 5 are located at both ends of the device. In the initial state, that is, when no voltage is applied to the first substrate 1 and the second substrate 5, the entire device is in a transparent state; when a negative voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrolyte layer 3 enter the electrochromic layer 4, and the ions in the electrochromic layer 4 are oxidized, and the electrochromic device changes from transparent to blue opaque, that is, it presents a dark state, and can realize the regulation of the near-infrared band; when a positive voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrolyte layer 3 will escape from the electrochromic layer 4, and the ions in the electrochromic layer 4 are reduced, and the electrochromic device changes from blue opaque to neutral opaque, and can realize the regulation of the visible light band.

[0042] It can be seen that when no voltage is applied to the first substrate 1 and the second substrate 5 of the electrochromic device provided by the present invention, the entire device is in a transparent state. When a negative voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrolyte layer 3 enter the electrochromic layer 4 and are oxidized, and the entire device changes from a transparent state to a blue opaque state, and can realize the regulation of the near-infrared band. When a positive voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrochromic layer 4 are reduced, and the electrochromic device changes from a blue opaque state to a neutral opaque state, and can realize the regulation of the visible light band. Furthermore, the electrochromic device can have an electrochromic property of independent dual-band regulation, realizing the color diversity of the electrochromic device, and meeting the requirements of multi-scenario applications. In addition, the structure of the series multi-stage structure electrochromic device is simple, and the processing technology is simple, which can reduce the production equipment and process costs and is suitable for large-scale production.

[0043] In some embodiments, as Figure 1 shown in Figure 2 the electrochromic layer 4 includes: a cathode electrochromic layer 41, a transparent conductive layer 42, and an anode electrochromic layer 43. The cathode electrochromic layer 41 is disposed on the electrolyte layer 3; the transparent conductive layer 42 is disposed on the cathode electrochromic layer 41; the anode electrochromic layer 43 is disposed on the transparent conductive layer 42.

[0044] Specifically, the cathode electrochromic layer 41, the transparent conductive layer 42 and the cathode electrochromic layer 41 are connected in series, and the transparent conductive layer 42, the anode electrochromic layer 43 and the cathode electrochromic layer 41 have a permeable pore structure, that is, a microporous structure, which can provide a large number of active sites and fast ion and electron transfer channels, so that the ions in the electrolyte layer 3 can enter the cathode electrochromic layer 41 and the anode electrochromic layer 43, which is beneficial to improve the response speed of the prepared electrochromic device and shorten the response time of coloring and fading of the prepared electrochromic device.

[0045] Among them, the cathode electrochromic layer 41 is an electrochromic layer made of a transition metal oxide that can undergo an oxidation-reduction reaction. When lithium ions are embedded in the lattice of the transition metal oxide, the metal cations undergo a reduction reaction, resulting in a coloring effect. When the lithium ions are released from the lattice of the transition metal oxide, the metal cations undergo an oxidation reaction, resulting in a fading effect. The anode electrochromic layer 43 is an electrochromic layer made of a transition metal oxide that can undergo an oxidation-reduction reaction. When lithium ions are embedded in the lattice of the transition metal oxide, the metal cations undergo a reduction reaction, resulting in a fading effect. When the lithium ions are released from the lattice of the transition metal oxide, the metal cations undergo an oxidation reaction, resulting in a coloring effect.

[0046] Then, when a negative voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrolyte layer 3 will enter the electrochromic layer 4, the ions in the cathode electrochromic layer 41 will be oxidized, and the electrochromic device will change from transparent to a blue opaque state, that is, it will show a dark state. When a positive voltage is applied to the first substrate 1 and the second substrate 5, the ions in the electrolyte layer 3 will escape from the electrochromic layer 4, the ions in the anode electrochromic layer 43 will be reduced, and the electrochromic device will change from a blue opaque state to a neutral opaque state. In this way, the two electrochromic layers 4 (anode electrochromic layer 43 and cathode electrochromic layer 41) have different regulated bands and working voltages, so that the device composed of this simple composite structure has independent dual-band regulated electrochromic characteristics.

[0047] In some embodiments, the transparent conductive layer 42 includes a transparent glass layer and a conductive layer disposed on a surface of the transparent glass layer. The conductive layer is an indium tin oxide conductive layer, a fluorine-doped tin oxide conductive layer, an aluminum-doped zinc oxide conductive layer, a silver nanowire conductive layer, a graphene conductive layer, or a carbon nanotube conductive layer.

[0048] Specifically, the transparent conductive layer 42 is a transparent glass coated with any one of conductive layers such as indium tin oxide, fluorine-doped tin oxide, aluminum-doped zinc oxide, silver nanowires, graphene, carbon nanotubes, etc. In specific implementation, the transparent conductive material can be prepared into a transparent porous conductive layer by one or two of the processing methods such as magnetron sputtering, screen printing, spin coating, coating, spraying, inkjet printing, etc.

[0049] In some embodiments, as Figure 1 shown, the thickness of the first substrate 1 is 1.1 - 2 mm; the thickness of the second substrate 5 is 1.1 - 2 mm. Specifically, the thickness range of the first substrate 1 is 1.1 - 2 mm. For example, it can be 1.1 mm, 1.5 mm, 2 mm. The thickness range of the second substrate 5 is 1.1 - 2 mm. For example, it can be 1.1 mm, 1.5 mm, 2 mm. The thicknesses of the first substrate 1 and the second substrate 5 can be very thin, and the size of the entire electrochromic device after being made can be 3.5 cm × 3.5 cm, with a relatively small overall volume.

[0050] In some embodiments, as Figure 3 shown, the tandem electrochromic device further includes: a conductive substrate 6, a first copper wire 7 and a second copper wire 8; the first copper wire 7 and the second copper wire 8 are disposed on the conductive substrate 6; the first substrate 1 is connected to the first copper wire 7, and the second substrate 5 is connected to the second copper wire 8. Specifically, when the electrochromic device needs to work, a power supply can be connected to the first copper wire 7 and the second copper wire 8 of the electrochromic device, so that a negative voltage or a positive voltage can be applied to the first substrate 1 and the second substrate 5.

[0051] In some embodiments, the present invention further provides a display device, which includes the tandem electrochromic device as described above. In some embodiments, the display device can be a device such as a smart wearable with electrochromic function, an automotive windshield, an aircraft window, etc.

[0052] In some embodiments, the present invention further provides a preparation method of the tandem electrochromic device, which specifically includes the steps:

[0053] The first step: In-situ grow an anodic electrochromic porous film on a transparent conductive glass substrate by any one of the methods such as electrochemical deposition, chemical bath deposition, solvothermal method, etc., wherein the anodic electrochromic layer includes one or more of nickel oxide, Prussian blue, and vanadium oxide. For example, select a commercially available transparent glass coated with an indium tin oxide conductive layer with a sheet resistance of 7 - 10 Ω / sq and immerse it in a 0.01 M nickel nitrate (Ni(NO3)2·6H2O) aqueous solution for electrodeposition experiments. At -0.05 mA / cm 2Electrodeposition is carried out at a low current density. After electrodeposition, the thin film is washed and dried, and then annealed at 300 °C for 1 h to obtain a nickel oxide thin film, thereby obtaining an anodic electrochromic layer.

[0054] The second step: By means of one or two of processing methods such as magnetron sputtering, screen printing, spin coating, coating, spraying, inkjet printing, etc., a transparent conductive material is prepared into a transparent porous conductive layer, which is attached to the anodic electrochromic layer, and a permeable microporous structure is formed between the closely arranged layers. Among them, the transparent conductive layer includes one or more of indium tin oxide, fluorine-doped tin oxide, aluminum-doped zinc oxide, silver nanowires, graphene, and carbon nanotubes. For example, indium tin oxide is prepared into a transparent conductive layer by means of magnetron sputtering and attached to the anodic electrochromic layer, and a permeable microporous structure is formed between the closely arranged layers. In one implementation, the sputtering atmosphere is argon, the flow rate is 300 sccm, and the sputtering time is 4500 s.

[0055] The third step: Any one of methods such as sol-gel, spray drying, solvothermal, etc. is used to prepare a cathodic electrochromic porous thin film. Among them, the cathodic electrochromic layer includes one or more of tungsten oxide, titanium oxide, and poly(3,4-ethylenedioxythiophene). The cathodic electrochromic material dispersion is deposited on the surface of the transparent conductive layer, and a permeable microporous structure is formed between the closely arranged layers. Among them, the deposition method can be any one of spraying, scraping, sputtering, evaporation coating, electrochemical deposition, etc. For example, the cathodic electrochromic material dispersion is coated on the surface of the transparent conductive layer to obtain a cathodic electrochromic layer. Among them, the coating can be spraying, that is, the cathodic electrochromic material dispersion is sprayed onto the surface of the transparent conductive layer by means of spraying to form a cathodic electrochromic coating film. The nozzle diameter of the spray gun is 0.1 - 0.5 μm, the distance between the spray gun and the anodic electrochromic thin film is 2 - 10 cm, and the concentration of the cathodic electrochromic material dispersion is 1 - 30 mg / mL. During the spraying process, the entire first substrate and the second substrate are heated, and the heating temperature is 40 - 120 °C to obtain a highly stable cathodic electrochromic thin film.

[0056] Among them, the preparation method of the cathodic electrochromic layer is as follows:

[0057] Synthesize WO 18 O 49 nanowires by solvothermal method. Add 0.06 g of WCl6 to 80 mL of ethanol to form a homogeneous solution under vigorous stirring, then transfer the solution to a 100 mL Teflon liner and place it in a stainless steel autoclave, heat it to 180 °C and keep the reaction for 24 h. After the reaction is completed, the product is centrifuged and then redispersed in ethanol for further application, and its concentration is 1.5 mg / mL.

[0058] Step 4: Slowly add cellulose into a mixed solution of water and polyethylene glycol at a certain temperature, stir for a period of time, add the salt solution into the mixed solution at a certain temperature and stir for a period of time. After centrifuging the obtained mixed solution, pour it into a petri dish and dry it to obtain a flexible transparent cellulose gel electrolyte membrane, and laminate the electrolyte layer and the electrochromic layer. The electrolyte layer includes cellulose, a solvent and a salt solution. The cellulose includes any one of hydroxypropyl methylcellulose, hydroxypropyl cellulose, etc. The solvent includes polyethylene glycol and water. The salt solution includes any one of sodium chloride, calcium chloride, sodium bromide, lithium perchlorate, lithium bis(trifluoromethanesulfonyl)imide or a blend of lithium bis(trifluoromethanesulfonyl)imide and N-methylacetamide, etc.

[0059] In one implementation, slowly add hydroxypropyl methylcellulose into a mixed solution of water and polyethylene glycol at a certain temperature and stir for a period of time. The mass ratio of water to polyethylene glycol is 18:2, the stirring speed is 400 r / min, and the temperature is 65 °C; the stirring time is 90 min. Then add the salt solution into the mixed solution at a certain temperature and stir for a period of time. The salt solution is preferably a blend of lithium bis(trifluoromethanesulfonyl)imide and N-methylacetamide. The concentration of the electrolyte in the salt solution in the whole system is preferably 0.5 mol / L, the temperature is preferably 25 °C, the stirring speed is preferably 300 r / min, and the stirring time is preferably 90 min. Then pour the mixed solution into a centrifuge tube and centrifuge at a certain rotational speed. The centrifugal rotational speed is 8000 r / min and the centrifugal time is 5 min. Finally, after centrifuging the obtained mixed solution, pour it into a petri dish and dry it to obtain a flexible transparent cellulose gel electrolyte membrane, where the oven temperature is preferably 60 °C and the drying time is 720 min.

[0060] Step 5: Prepare an ion storage layer on a transparent conductive glass substrate by any one of methods such as electrochemical deposition, chemical bath deposition, solvothermal method, etc. Among them, the ion storage layer includes one or more of nickel oxide, Prussian blue and vanadium oxide.

[0061] In some embodiments, the counter electrode layer is composed of a transparent conductive glass with a thickness of 1.1 mm and an ion storage layer material.

[0062] Among them, the preparation method of the ion storage layer is as follows:

[0063] Select a commercially available transparent glass coated with an indium tin oxide conductive layer with a sheet resistance of 7 - 10 Ω / sq and immerse it in a 0.01 M aqueous solution of nickel nitrate (Ni(NO3)2·6H2O) for an electrodeposition experiment. At -0.05 mA / cm 2Electrodeposition was performed at a low current density of 100 nm. After electrodeposition, the film was cleaned and dried, and then annealed at 300°C for 1 hour to obtain a nickel oxide film, thereby obtaining an ion storage layer.

[0064] In summary, the series electrochromic device and display device provided by the present invention have the following beneficial effects:

[0065] A multi-layer series multi-level structure is adopted. By selecting electrochromic layers of different materials and applying different voltages, different colors can be displayed, thus achieving color diversity of the prepared electrochromic device.

[0066] The device uses a multi-layer, series-connected, multi-stage structure and selects electrochromic materials with different wavelengths to achieve dual-band control of the visible and near-infrared bands. When a positive voltage is applied to the device, the anode electrochromic material displays color, allowing for control of the visible light band; when a negative voltage is applied to the device, the cathode electrochromic material displays color, allowing for control of the near-infrared band.

[0067] The transparent porous conductive layer in the middle of the electrochromic layer of the electrochromic device increases the conductive path of the electrochromic material and promotes the transfer of electrons, which is beneficial to further improve the electrochromic response speed of the prepared device and shorten the coloring and fading response time of the prepared device;

[0068] The anode and cathode electrochromic layers are made of porous nanomaterials, which have the characteristics of large specific surface area, multiple active sites, and short ion diffusion distance, which are beneficial to improving the response speed of the prepared device and shortening the coloring and fading response time of the prepared device.

[0069] The series-type multi-stage electrochromic device has a simple structure and a simple processing technology, which can reduce the cost of production equipment and process and is suitable for large-scale production.

[0070] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A tandem electrochromic device, characterized in that, Comprising: A first substrate; An ion storage layer disposed on the first substrate; An electrolyte layer disposed on the ion storage layer; An electrochromic layer disposed on the electrolyte layer; A second substrate disposed on the electrochromic layer; The electrochromic layer is configured to modulate the near-infrared band when a negative voltage is applied between the first substrate and the second substrate, and is further configured to modulate the visible light band when a positive voltage is applied between the first substrate and the second substrate.

2. The tandem electrochromic device according to claim 1, wherein The electrochromic layer comprises: A cathode electrochromic layer disposed on the electrolyte layer; A transparent conductive layer disposed on the cathode electrochromic layer; An anode electrochromic layer disposed on the transparent conductive layer.

3. The tandem electrochromic device according to claim 2, wherein, The cathode electrochromic layer has a permeable pore structure; the transparent conductive layer has a permeable pore structure; the anode electrochromic layer has a permeable pore structure.

4. The tandem electrochromic device according to claim 2, characterized in that, The first substrate, the anode electrochromic layer, the transparent conductive layer and the cathode electrochromic layer constitute the electrochromic layer; the second substrate and the ion storage layer constitute a counter electrode.

5. The tandem electrochromic device according to claim 1, wherein The tandem electrochromic device further comprises: a conductive substrate, a first copper wire and a second copper wire; the first copper wire and the second copper wire are disposed on the conductive substrate; the first substrate is connected to the first copper wire, and the second substrate is connected to the second copper wire.

6. The tandem electrochromic device according to claim 2, wherein, The transparent conductive layer comprises a transparent glass layer and a conductive layer disposed on the surface of the transparent glass layer; the conductive layer is an indium tin oxide conductive layer, a fluorine-doped tin oxide conductive layer, an aluminum-doped zinc oxide conductive layer, a silver nanowire conductive layer, a graphene conductive layer or a carbon nanotube conductive layer.

7. The tandem electrochromic device according to claim 2, characterized in that, The anode electrochromic layer is a metal oxide electrochromic layer.

8. The tandem electrochromic device according to claim 2, wherein The cathode electrochromic layer is a metal oxide electrochromic layer.

9. The tandem electrochromic device according to claim 1, wherein, The thickness of the first substrate is 1.1 - 2 mm; the thickness of the second substrate is 1.1 - 2 mm.

10. A display device, characterized in that, Comprising the tandem electrochromic device according to any one of claims 1 - 9.

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