Multicolor electrochromic gel material, preparation method, application and electrochromic gel device and preparation method thereof

Abstract

The present application belongs to the technical field of photoelectric materials, and provides a multi-color variable color electrochromic gel material, a preparation method and application thereof, and an electrochromic gel device and a preparation method thereof. The multi-color variable color electrochromic gel material comprises polyaniline powder, P2W 18 solution and gum arabic solution; a volume ratio of the P2W 18 solution and the gum arabic solution is 1:1-10:1. The present application also provides a preparation method and application of the multi-color variable color electrochromic gel material. The present application also provides an electrochromic device and a preparation method thereof. The present application is based on a synergistic effect of polyaniline and P2W 18 , P2W 18 forms an electrode complement in the device with polyaniline, and utilizes a physical cross-linking property of gum arabic to form a three-dimensional network structure through a low-temperature crystallization-room temperature melting cycle, to form a stable fixation of polyaniline and P2W 18 , so that the device can realize four-level color changes of transparent-blue-green-yellow.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of photoelectric materials, and particularly relates to a multi-color variable color electrochromic gel material and a preparation method and application thereof, and an electrochromic gel device and a preparation method thereof. BACKGROUND

[0002] The performance improvement of the electrochromic device depends on the innovation of material preparation process and the optimization of device structure. The traditional electrochromic material has a single color, and it is difficult to realize multi-color change. In the prior art, the multi-color display capability and response speed of the device are improved by material compounding, such as TiO2 and ion gel of complex violet. However, the violet material needs a complex organic synthesis process, and the raw material is expensive, resulting in high device manufacturing cost. In addition, the preparation process of the gel is complex, which easily leads to local gelation failure or optical inhomogeneity.

[0003] In addition, the existing gel-based electrochromic material also has the problems of long gelation time, poor uniformity, slow color change response and narrow light modulation range, and the single electrode material limits the application expansion of the device in the flexible and wearable fields. Therefore, it is urgent to develop a multi-color variable color electrochromic gel material and a preparation method and application thereof, and an electrochromic gel device and a preparation method thereof. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a multi-color variable color electrochromic gel material and a preparation method and application thereof, and an electrochromic gel device and a preparation method thereof.

[0005] The technical scheme adopted by the present application is: a multi-color variable color electrochromic gel material, raw materials including polyaniline powder, P2W 18 solution and gum arabic solution; the volume ratio of the P2W 18 solution and the gum arabic solution is 1:1-10:1.

[0006] The gum arabic solution is specifically: 2g-5g of gum arabic is dissolved in 100ml of deionized water to prepare a gum arabic solution;

[0007] The P2W 18 solution is specifically: 1g-3g of P2W 18 is dissolved in 50mL of N,N-dimethylformamide to prepare a P2W 18 solution, and the P2W 18 is a Dawson-type polyacid K6[alpha-P2W 18 O 62 ]·14H2O.

[0008] The addition amount of the polyaniline powder accounts for 10%-20% of the mass of the gum arabic.

[0009] Furthermore, the polyaniline powder is prepared by polymerizing aniline and ammonium persulfate in a reactor, and the synthesis method is specifically as follows:

[0010] First, aniline was dissolved in 1 mol / L hydrochloric acid solution to prepare an aniline solution with a concentration of 0.5 mol / L-1 mol / L;

[0011] Then, ammonium persulfate was added to the aniline solution as an oxidant, stirred evenly, and then transferred to a reactor. The molar ratio of ammonium persulfate to aniline was 1:1.

[0012] Finally, the reactor was sealed and the temperature of the reactor was set to 120° C. to carry out polyaniline synthesis reaction for 6 h. After the reaction was completed, the reaction was cooled to room temperature, washed repeatedly with deionized water and ethanol, and vacuum dried to obtain polyaniline powder.

[0013] The present invention also provides a method for preparing the multi-color electrochromic gel material, which specifically comprises the following steps:

[0014] (1) Take polyaniline powder and P2W according to the above ratio 18 solution and gum arabic solution;

[0015] (2) Preparation of Gum Arabic-P2W 18 Mixed solution:

[0016] According to the above volume ratio, the gum arabic solution and P2W 18 The solutions were mixed and ultrasonically dispersed for 30 min to obtain a uniform mixture, namely gum arabic-P2W. 18 Mixing solution;

[0017] (3) Add polyaniline powder to the gum arabic-P2W prepared in step (2) 18 The mixed solution was magnetically stirred for 2 h until completely dispersed, poured into a mold, frozen at -20 °C for 12 h, and then thawed at room temperature for 8 h. The freeze-thaw cycle was repeated 2-3 times to obtain a multi-color electrochromic gel.

[0018] The present invention also provides an electrochromic device, comprising two pieces of FTO conductive glass, wherein the conductive surface of one piece of FTO conductive glass is covered with a conductive copper film, serving as a first electrode, and the other piece of FTO conductive glass is blank conductive glass, serving as a second electrode. The above-mentioned multi-color electrochromic gel is placed between the two pieces of FTO conductive glass, covering the conductive copper film.

[0019] Furthermore, the thickness of the conductive copper film is 50 nm-200 nm, and the thickness of the multi-color electrochromic gel is 50 μm-500 μm.

[0020] The present invention further provides a method for preparing the electrochromic device, which specifically comprises the following steps:

[0021] (1) Deposition of conductive copper film on the surface of conductive glass by electropolymerization process:

[0022] The FTO conductive glass was used as a substrate and immersed in a 1 mol / L sulfuric acid solution containing 0.3 mol / L copper sulfate. A platinum sheet was used as a counter electrode and electropolymerization was carried out at a constant potential of -0.3V-0.5V for 30 minutes to deposit a conductive copper film on the surface of the FTO conductive glass. The glass was then rinsed with deionized water and ethanol and dried for later use.

[0023] (2) Prepare 1 mol / L propylene carbonate solution containing lithium ions:

[0024] Dissolve 1.06 g of lithium perchlorate in 10 ml of propylene carbonate solution and stir at 70°C for 30 minutes to obtain a uniform 1 mol / L propylene carbonate solution containing lithium ions, i.e., the electrolyte solution;

[0025] (3) Cut the multi-color electrochromic gel into sheets that match the size of the FTO conductive glass, soak them in the electrolyte solution prepared in step (2), and soak them for 1 hour; take them out and place them on a blank conductive glass, and then cover them on another piece of FTO conductive copper film. The two pieces of FTO conductive glass clamp the multi-color electrochromic gel, and the edges are sealed with silicone rubber to obtain an electrochromic device.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The multi-color electrochromic gel material of the present invention is based on polyaniline and P2W 18 The synergy of P2W 18 In the device, it forms an electrode complementary with polyaniline, and utilizes the physical cross-linking properties of gum arabic to form a three-dimensional network structure through low-temperature crystallization-room-temperature melting cycles. 18 A stable fixation is formed, so that the electrochromic device can achieve four-level color changes of transparent (2V) - blue (-2.0V) - green (-0.5V) - yellow (0V) in the voltage range of -2.0V to 2V. When the potential increases, the oxidation of polyaniline is promoted, and the ratio of benzo / quinone units in the molecular structure of polyaniline and the protonation state are jointly regulated, expanding the conjugated system, resulting in a red shift in the absorption spectrum, and the color changes from yellow to green and blue, showing a blue-green-yellow three-color change; when the potential is reduced, the reduction process drives the reverse color change, and the light modulation can reach more than 69%.

[0028] The multicolor electrochromic gel material of the present application adopts a freeze-thaw gelation technology, discards traditional electrochemical polymerization or chemical crosslinking agent, utilizes the physical crosslinking characteristics of gum arabic, forms a three-dimensional network structure through a low-temperature crystallization-room temperature melting cycle, shortens the gelation time to 1 / 3 of the traditional method, and improves the gel uniformity. The polyaniline polymerization adopts a reaction kettle synthesis process, realizes controllable polymerization of polyaniline through a high-temperature high-pressure reaction kettle environment, compared with the traditional solution polymerization method, the product has narrow molecular weight distribution and high crystallinity, and the stability of the electrochromic performance is significantly improved. The electrochromic device adopts an electrochemical polymerization process to deposit a copper film on the surface of the conductive glass in situ, breaks through the limitations of the traditional FTO electrode, and expands the application of the electrochromic gel material and the electrochromic device in the fields of flexible electronics, intelligent windows and the like. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of the electrochromic device of the present application.

[0030] Figure 2 is a full spectrum diagram of the electrochromic device prepared in Example 1 under ultraviolet visible light 400nm-800nm, and the applied voltage is-2v-2v.

[0031] Figure 3 is a full spectrum diagram of the electrochromic device prepared in Example 2 under ultraviolet visible light 400nm-800nm, and the applied voltage is-2v-2v.

[0032] Figure 4 is a full spectrum diagram of the electrochromic device prepared in Example 3 under ultraviolet visible light 400nm-800nm, and the applied voltage is-2v-2v.

[0033] Figure 5 is a full spectrum diagram of the electrochromic device prepared in Comparative Example 1 under ultraviolet visible light 400nm-800nm, and the applied voltage is-2v-2v.

[0034] Figure 6 is a full spectrum diagram of the electrochromic device prepared in Comparative Example 2 under ultraviolet visible light 400nm-800nm, and the applied voltage is-1.6v-1.6v.

[0035] In the figure, 1 is FTO conductive glass, 2 is conductive copper film, and 3 is multicolor electrochromic gel. DETAILED DESCRIPTION

[0036] In order to highlight the technical advantages and excellent performance of the present application, the following will be further described in combination with the drawings and specific examples. The following specific examples are only for the present application, and the specific implementation process can also be adjusted according to the understanding of the technical personnel and the actual situation.

[0037] Example 1

[0038] The multi-color electrochromic gel material is prepared by mixing a P2W 18 solution and an Arabic gum solution; the volume ratio of the P2W 18 solution and the Arabic gum solution is 1:1.

[0039] The Arabic gum solution is prepared by dissolving 2g of Arabic gum in 100ml of deionized water.

[0040] The P2W 18 solution is prepared by dissolving 1g of P2W 18 in 50mL of N,N-dimethylformamide. 18 The P2W 18 is a Dawson-type polyacid K6[α-P2W 18 O 62 ]·14H2O.

[0041] The synthesis method of the Dawson-type polyacid K6[α-P2W 18 O 62 ]·14H2O is as follows:

[0042] First, 30g of Na2WO4·2H2O is added to 30mL of deionized water, and a colorless solution is obtained after complete dissolution; then 15mL of HCl solution and 15mL of H3PO4 solution are sequentially added, and a light yellow clear solution is obtained; then refluxing is carried out at 130℃ for 24h, and after refluxing, 30g of KCl is added to obtain a yellow precipitate, which is filtered and dried in air for 2h to obtain a crude product; finally, the crude product is dissolved in water, and insoluble substances are removed by filtration; the filtrate is evaporated to 20mL-30mL by heating, and cooled to room temperature; after standing for 3 days, a crystal product is obtained, which is the Dawson-type polyacid K6[α-P2W 18 O 62 ]·14H2O.

[0043] The addition amount of the polyaniline powder is 10% of the mass of the Arabic gum. (The addition amount in this embodiment is 0.2g)

[0044] The polyaniline powder is prepared by polymerization of aniline and ammonium persulfate in a reaction kettle, and the synthesis method is as follows:

[0045] First, 5g-10g of aniline is dissolved in 100mL of 1mol / L hydrochloric acid solution to prepare an aniline solution with a concentration of 0.5mol / L-1mol / L.

[0046] Then, ammonium persulfate is added to the aniline solution as an oxidizing agent, and after stirring uniformly, it is transferred to the reaction kettle; the molar ratio of ammonium persulfate to aniline is 1:1.

[0047] Finally, the reactor was sealed and the temperature of the reactor was set to 120° C. to carry out polyaniline synthesis reaction for 6 h. After the reaction was completed, the reaction was cooled to room temperature, washed repeatedly with deionized water and ethanol, and vacuum dried to obtain polyaniline powder.

[0048] The use of the multi-color electrochromic gel material of Example 1 in preparing the multi-color electrochromic gel 3, and the preparation method of the multi-color electrochromic gel material specifically include the following steps:

[0049] (1) Take polyaniline powder and P2W according to the above ratio 18 solution and gum arabic solution;

[0050] (2) Preparation of Gum Arabic-P2W 18 Mixed solution:

[0051] According to the above volume ratio, the gum arabic solution and P2W 18 The solutions were mixed and ultrasonically dispersed for 30 min to obtain a uniform mixture, namely gum arabic-P2W. 18 Mixing solution;

[0052] (3) Add polyaniline powder to the gum arabic-P2W prepared in step (2) 18 The mixed solution was magnetically stirred for 2 h until completely dispersed, poured into a mold, frozen at -20 °C for 12 h, and then thawed at room temperature for 8 h. The freeze-thaw cycle was repeated 2-3 times to obtain a multi-color electrochromic gel 3.

[0053] The electrochromic device includes the multi-color-changing electrochromic gel 3 prepared by the preparation method of the multi-color-changing electrochromic gel material.

[0054] like Figure 1 As shown, the electrochromic device includes two pieces of FTO conductive glass 1, the conductive surface of one piece of FTO conductive glass 1 is covered with a conductive copper film 2, which serves as a first electrode, and the other piece of FTO conductive glass 1 is blank conductive glass, which serves as a second electrode. A multi-color electrochromic gel 3 is placed between the two pieces of FTO conductive glass 1 to cover the conductive copper film 2.

[0055] The thickness of the conductive copper film 2 is 50 nm to 200 nm, and the thickness of the multi-color electrochromic gel 3 is 50 μm to 500 μm.

[0056] The method for preparing the electrochromic device specifically comprises the following steps:

[0057] (1) Depositing a conductive copper film on the surface of conductive glass by electropolymerization process 2:

[0058] The FTO conductive glass 1 is used as a substrate, and is immersed in a 1 mol / L sulfuric acid solution containing 0.3 mol / L copper sulfate, with a platinum plate as a counter electrode, and a conductive copper film 2 is deposited on the surface of the FTO conductive glass 1 by electro-polymerization at a constant potential of -0.3V-0.5V for 30 min, and then is washed with deionized water and ethanol and dried for use;

[0059] (2) A 1 mol / L propylene carbonate solution containing lithium ions is prepared:

[0060] 1.06 g of lithium perchlorate is dissolved in 10 mL of propylene carbonate solution, and stirred at 70°C for 30 min to obtain a uniform 1 mol / L propylene carbonate solution containing lithium ions, i.e., an electrolyte solution;

[0061] (3) The multi-color electrochromic gel 3 is cut into a sheet matching the size of the FTO conductive glass 1, immersed in the electrolyte solution prepared in step (2) for 1 h, taken out and placed on a blank conductive glass, and then covered with another FTO conductive copper film 2, and the two FTO conductive glasses 1 clamp the multi-color electrochromic gel 3, and the edges are sealed with silicone rubber to obtain an electrochromic device.

[0062] Performance test: In the electrochromic device prepared in Example 1, the first electrode is used as the positive electrode and the second electrode is used as the negative electrode, and the test is performed, and the applied voltage is -2v-2v, and the wavelength is 400nm-800nm in the ultraviolet-visible spectrophotometer, and the transmittance change of the electrochromic device is as shown in Figure 2 , and the light modulation of the device is 69.1%.

[0063] Example 2

[0064] The difference from Example 1 is that:

[0065] The multi-color electrochromic gel material includes polyaniline powder, a P2W 18 solution, and an acacia solution; the volume ratio of the P2W 18 solution and the acacia solution is 10:1.

[0066] The acacia solution is specifically prepared by dissolving 5 g of acacia in 100 ml of deionized water.

[0067] The P2W 18 solution is specifically prepared by dissolving 3 g of P2W 18 in 50 mL of N,N-dimethylformamide to prepare a P2W 18 solution, and the P2W 18 is a Dawson-type polyacid K6[α-P2W 18 O62 ]·14H2O.

[0068] The added amount of the polyaniline powder accounts for 20% of the mass of the gum arabic. (The added amount in this embodiment is 1 g)

[0069] The polyaniline powder is prepared by polymerization of aniline and ammonium persulfate in a reaction kettle. The synthesis method is specifically as follows:

[0070] First, 5 g-10 g of aniline is dissolved in 100 mL of 1 mol / L hydrochloric acid solution to prepare an aniline solution with a concentration of 0.5 mol / L-1 mol / L;

[0071] Then, ammonium persulfate is added to the aniline solution as an oxidizing agent, and after stirring uniformly, the solution is transferred to the reaction kettle. The molar ratio of ammonium persulfate to aniline is 1:1;

[0072] Finally, the reaction kettle is sealed, and the temperature of the reaction kettle is set to 120°C. The polyaniline synthesis reaction is performed for 6 h. After the reaction is completed, the reaction kettle is cooled to room temperature, and the polyaniline powder is obtained by repeated washing with deionized water and ethanol and vacuum drying.

[0073] Performance test: In the electrochromic device prepared in Example 2, the first electrode is used as the positive electrode, and the second electrode is used as the negative electrode. The test is performed by applying a voltage of -2v-2v. The transmittance change of the electrochromic device prepared in Example 2 is shown in Figure 3 The light modulation of the device is 69.3%.

[0074] Example 3

[0075] The difference from Example 1 is that:

[0076] The multi-color electrochromic gel material includes polyaniline powder, P2W 18 solution, and gum arabic solution. The volume ratio of the P2W 18 solution and the gum arabic solution is 5:1.

[0077] The gum arabic solution is specifically prepared by dissolving 4 g of gum arabic in 100 mL of deionized water.

[0078] The P2W 18 solution is specifically prepared by dissolving 2 g of P2W 18 in 50 mL of N,N-dimethylformamide to prepare a P2W 18 solution. The P2W 18 is a Dawson-type polyacid K6[α-P2W 18 O 62 ]·14H2O.

[0079] The amount of poly-aniline powder added is 15% of the mass of gum arabic. (The amount added in this example is 0.6g)

[0080] The poly-aniline powder is prepared by polymerization of aniline and ammonium persulfate in a reaction kettle. The synthesis method is as follows:

[0081] First, 5-10g of aniline is dissolved in 100mL of 1mol / L hydrochloric acid solution to prepare an aniline solution with a concentration of 0.5mol / L-1mol / L;

[0082] Ammonium persulfate is added to the aniline solution as an oxidizing agent, and after stirring, the mixture is transferred to the reaction kettle. The molar ratio of ammonium persulfate to aniline is 1:1;

[0083] The reaction kettle is sealed, and the temperature of the reaction kettle is set to 120°C. The poly-aniline synthesis reaction is carried out for 6h. After the reaction is complete, the reaction kettle is cooled to room temperature, and the product is washed repeatedly with deionized water and ethanol, and then vacuum dried to obtain the poly-aniline powder.

[0084] Performance test: In the electrochromic device prepared in Example 3, the first electrode is used as the positive electrode, and the second electrode is used as the negative electrode. The test is carried out by applying a voltage of -2v-2v. The transmittance change of the electrochromic device prepared in Example 3 is shown in Figure 4 , and the light modulation of the device is 69.4%.

[0085] Comparative Example 1

[0086] The difference from Example 1 is that no P2W 18 solution is added to the multi-color changing electrochromic gel material.

[0087] The other aspects are the same as in Example 1.

[0088] Performance test: In the electrochromic device prepared in Comparative Example 1, the first electrode is used as the positive electrode, and the second electrode is used as the negative electrode. The test is carried out by applying a voltage of -2v-2v. The transmittance change of the electrochromic device prepared in Comparative Example 1 is shown in Figure 5 , and the light modulation of the device is 25.2%.

[0089] Comparative Example 2

[0090] The difference from Example 1 is that no poly-aniline powder is added to the multi-color changing electrochromic gel material.

[0091] The other aspects are the same as in Example 1.

[0092] Performance test: the electrochromic device prepared by Comparative Example 2 was tested with the first electrode as the positive electrode and the second electrode as the negative electrode, and a voltage of -1.6V-1.6V was applied. The wavelength was 400nm-800nm, and the transmittance change of the electrochromic device prepared by Comparative Example 2 was tested in a UV-visible spectrophotometer, as shown in Figure 6 The light modulation of the device was 56.6%.

[0093] From the performance tests of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2, it can be seen that the light modulation ranges of Example 1, Example 2 and Example 3 are higher than those of Comparative Example 1 and Comparative Example 2. The polyphenylamine powder synthesized by the reaction kettle in the present application and P2W 18 18 and gum arabic, the device can realize four-level color change from transparent (2V) to blue (-2.0V) to green (-0.5V) to yellow (0V) in the voltage range of -2.0V to 2V, and the light modulation can reach more than 69%.

[0094] From the light modulation data of Example 1, Example 2 and Example 3, it can be further seen that when the amount of P2W 18 18 and polyphenylamine powder is small, the color of the device is more transparent when it fades, and the color is lighter when it colors, which shows that the amount of active substance directly affects the light modulation range of the device.

[0095] The above is only a preferred embodiment of the present application. For those skilled in the art, according to the idea of the present application, many changes can be made in the specific implementation and application range, as long as these changes do not deviate from the concept of the present application, and they all belong to the protection scope of the present application.

Claims

1. Multi-color electrochromic gel material, characterized by: Raw materials include polyaniline powder, P2W 18 Solution and gum arabic solution; the P2W 18 The volume ratio of the solution to the gum arabic solution is 1:1-10:1; The gum arabic solution is prepared by dissolving 2g-5g of gum arabic in 100ml of deionized water; P2W 18 The specific solution is: 1g-3g of P2W 18 Dissolve in 50 mL of N,N-dimethylformamide to prepare P2W 18 solution, the P2W 18 It is a Dawson type polyoxometalate K6[α-P2W 18 O 62 ]·14H2O; The added amount of polyaniline powder accounts for 10%-20% of the mass of gum arabic.

2. The multi-color electrochromic gel material according to claim 1, characterized in that: The polyaniline powder is prepared by polymerizing aniline and ammonium persulfate in a reactor. The specific synthesis method is as follows: First, aniline was dissolved in 1 mol / L hydrochloric acid solution to prepare an aniline solution with a concentration of 0.5 mol / L-1 mol / L; Then, ammonium persulfate was added to the aniline solution as an oxidant, stirred evenly, and then transferred to a reactor. The molar ratio of ammonium persulfate to aniline was 1:

1. Finally, the reactor was sealed and the temperature of the reactor was set to 120° C. to carry out polyaniline synthesis reaction for 6 h. After the reaction was completed, the reaction was cooled to room temperature, washed repeatedly with deionized water and ethanol, and vacuum dried to obtain polyaniline powder.

3. The method for preparing the multi-color electrochromic gel material according to claim 1 or 2, comprising the following steps: (1) Take polyaniline powder and P2W according to the above ratio 18 solution and gum arabic solution; (2) Preparation of Gum Arabic-P2W 18 Mixed solution: According to the above volume ratio, the gum arabic solution and P2W 18 The solutions were mixed and ultrasonically dispersed for 30 min to obtain a uniform mixture, namely gum arabic-P2W. 18 Mixing solution; (3) Add polyaniline powder to the gum arabic-P2W prepared in step (2) 18 The mixed solution was magnetically stirred for 2 h until completely dispersed, poured into a mold, frozen at -20 °C for 12 h, and then thawed at room temperature for 8 h. The freeze-thaw cycle was repeated 2-3 times to obtain a multi-color electrochromic gel.

4. Use of the multi-color electrochromic gel material according to claim 1 or 2 in the preparation of a multi-color electrochromic gel.

5. An electrochromic device, characterized in that The invention comprises a multi-color-changing electrochromic gel prepared by the method for preparing the multi-color-changing electrochromic gel material as claimed in claim 3.

6. The electrochromic device according to claim 5, wherein: It includes two pieces of FTO conductive glass, the conductive surface of one piece of FTO conductive glass is covered with a conductive copper film, which serves as the first electrode, and the other piece of FTO conductive glass is blank conductive glass, which serves as the second electrode. The above-mentioned multi-color electrochromic gel is placed between the two pieces of FTO conductive glass to cover the conductive copper film.

7. The electrochromic device according to claim 6, wherein: The thickness of the conductive copper film is 50nm-200nm, and the thickness of the multi-color electrochromic gel is 50μm-500μm.

8. The method for preparing an electrochromic device according to claim 6 or 7, wherein: The preparation method specifically comprises the following steps: (1) Deposition of conductive copper film on the surface of conductive glass by electropolymerization process: The FTO conductive glass was used as a substrate and immersed in a 1 mol / L sulfuric acid solution containing 0.3 mol / L copper sulfate. A platinum sheet was used as a counter electrode and electropolymerization was carried out at a constant potential of -0.3V-0.5V for 30 minutes to deposit a conductive copper film on the surface of the FTO conductive glass. The glass was then rinsed with deionized water and ethanol and dried for later use. (2) Prepare 1 mol / L propylene carbonate solution containing lithium ions: Dissolve 1.06 g of lithium perchlorate in 10 ml of propylene carbonate solution and stir at 70°C for 30 minutes to obtain a uniform 1 mol / L propylene carbonate solution containing lithium ions, i.e., the electrolyte solution; (3) Cut the multi-color electrochromic gel into sheets that match the size of the FTO conductive glass, soak them in the electrolyte solution prepared in step (2), and soak them for 1 hour; take them out and place them on a blank conductive glass, and then cover them on another piece of FTO conductive copper film. The two pieces of FTO conductive glass clamp the multi-color electrochromic gel, and the edges are sealed with silicone rubber to obtain an electrochromic device.

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