Preparation method of positive electrode-electrolyte integrated structure for secondary battery

Abstract

The invention discloses a preparation method of a positive electrode-electrolyte integrated structure for a secondary battery, and relates to the field of secondary batteries. Comprising the following steps: 1) preparing a positive plate: mixing a positive active material, a conductive agent, a binder, a solvent and an acrylic monomer, then coating a current collector with the mixture, and finally drying to obtain the positive plate; 2) preparing an electrolyte precursor solution: mixing electrolyte salt, an acrylamide monomer, an initiator, a cross-linking agent and an electrolyte solvent to obtain the electrolyte precursor solution; and 3) dispensing the electrolyte precursor solution on the positive plate, and illuminating to obtain an electrode-electrolyte integrated structure. According to the invention, the contact interface between the electrode and the electrolyte is effectively improved, and the preparation process flow of the secondary battery can be obviously shortened. Taking an aqueous zinc ion secondary battery as an example, a button battery assembled by adopting an electrode-electrolyte integrated structure still keeps high capacity of 200 mAh / g after being circulated for 900 circles under the current of 0.5 A / g.

Description

Technical Field

[0001] The present invention relates to the field of secondary batteries, and particularly to a method for preparing a cathode - electrolyte integrated structure for secondary batteries. Background Art

[0002] A secondary battery is a type of battery that can be used repeatedly through charging and discharging cycles, also known as a rechargeable battery or a storage battery, and has a wide range of applications in practical use, such as electric vehicles, energy storage systems, portable electronic devices, etc. A secondary battery generally consists of six main parts: a positive electrode, a negative electrode, a current collector, an electrolyte, a separator, and a casing. During the discharging process, ions are released from the negative electrode, pass through the electrolyte and the separator, and are embedded into the positive electrode material. At the same time, electrons flow out from the negative electrode, return to the positive electrode through the external circuit, forming an electric current. The charging process is the opposite, where ions are released from the positive electrode and return to the negative electrode, and electrons flow out from the positive electrode and return to the negative electrode through the external circuit. During the production and manufacturing process of secondary batteries, safety issues are a key aspect that requires special attention. The safety issues are mainly reflected in some irreversible changes and reactions that occur between the electrode sheet and the electrolyte during the charge - discharge cycle. Traditional secondary batteries use liquid electrolytes, which can leak during the charge - discharge process and cause serious safety accidents. Therefore, solid electrolytes have received extensive attention. However, the current solid electrolytes and electrode sheets are manufactured separately and then combined. Therefore, the poor solid - solid contact interface between the electrode sheet and the solid electrolyte will have a significant impact on the performance of the battery. In view of this, it is urgent for us to develop a new and efficient method for preparing secondary batteries to improve the contact problem between different components of secondary batteries during production, especially the contact problem between the battery electrode and the electrolyte.

[0003] To solve the contact problem between the electrode sheet and the electrolyte, constructing a good contact interface has become the focus of extensive attention and research. A high - quality electrode - electrolyte contact interface helps to promote the transfer of electron charges and the diffusion of ions, reduce the interface impedance, and thus improve the cycle stability and overall performance of secondary batteries. Traditional methods for improving the interface contact performance, such as heat treatment and activation at low current, have problems such as time - consuming, energy - consuming, high cost, inconvenient operation, etc., and rely on external forces, unable to fully utilize the excellent performance of the battery itself. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems in the prior art, and provide a method for preparing a cathode - electrolyte integrated structure for secondary batteries, which can form a cathode - electrolyte integrated structure in one step under ultraviolet light irradiation in a short time.

[0005] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions:

[0006] A method for preparing a cathode-electrolyte integrated structure for a secondary battery, comprising the following steps:

[0007] 1) Prepare the cathode sheet: Mix the cathode active material, conductive agent, binder, solvent and acrylic monomer, then coat it on the current collector, and finally dry it to obtain the cathode sheet;

[0008] 2) Prepare the electrolyte precursor solution: Mix the electrolyte salt, acrylamide monomer, initiator, crosslinking agent and electrolyte solvent to obtain the electrolyte precursor solution;

[0009] 3) Drop-coat the electrolyte precursor solution onto the cathode sheet and irradiate it with light to obtain the electrode-electrolyte integrated structure.

[0010] In step 1), by mass, 100 parts of the cathode active material, 10 - 40 parts of the conductive agent, 5 - 20 parts of the binder, and 20 - 65 parts of the acrylic monomer.

[0011] The cathode active material includes at least one of vanadium oxide, manganese oxide, Prussian blue, and lithium iron phosphate.

[0012] The current collector is titanium foil, stainless steel mesh, copper foil, carbon paper, etc.

[0013] The binder includes, but is not limited to, polymer binders such as polyvinylidene fluoride, polyacrylic acid, and polyurethane, conductive polymer binders such as polyaniline and polypyrrole, and natural polymer binders such as gelatin and carrageenan.

[0014] The conductive agent includes, but is not limited to, carbon-based conductive agents such as Ketjen black, acetylene black, carbon black, and carbon nanotubes, and polymer conductive agents such as polyaniline (PANI), polypyrrole (PPy), and poly(3,4-ethylenedioxythiophene) (PEDOT).

[0015] In step 1), the solvent includes, but is not limited to, N-methylpyrrolidone, acetonitrile, dimethyl sulfoxide, methanol, deionized water, propanol, butanol, and vinyl acetate.

[0016] In step 2), by mass, 100 parts of the electrolyte salt, 40 - 160 parts of the acrylamide monomer, 3 - 15 parts of the initiator, and 5 - 35 parts of the crosslinking agent.

[0017] The initiator includes at least one of benzophenone, benzoic acid, and 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone.

[0018] The crosslinking agent includes at least one of N,N'-methylenebisacrylamide, benzoyl peroxide, diisocyanatohexane, and glutaraldehyde.

[0019] The electrolyte salts include, but are not limited to, zinc trifluoromethanesulfonate, zinc sulfate, manganese sulfate, lithium trifluoromethanesulfonate and other electrolyte salts.

[0020] The electrolyte solvents include, but are not limited to, deionized water, methanol, ethanol, acetone, dimethyl carbonate, aqueous acrylic acid solution, toluene and other organic solvents, as well as ionic liquids and the like.

[0021] In step 3), the light source is ultraviolet light, and xenon lamps, ultraviolet lamps, mercury lamps, LED lamps, etc. can be used.

[0022] A positive electrode - electrolyte integrated structure for secondary batteries is prepared by the preparation method of the present invention.

[0023] An application of a positive electrode - electrolyte integrated structure for secondary batteries is used to prepare secondary batteries.

[0024] Compared with the prior art, the beneficial effects achieved by the technical solution of the present invention are as follows:

[0025] 1) The present invention utilizes the free - radical polymerization of acrylic monomers under photo - initiation to form polymer segments, and constructs a polymer network or framework structure under the action of a cross - linker. This method is simple, environmentally friendly and low - cost. The preparation of the electrode - electrolyte integrated structure can be achieved in one step through simple light irradiation, eliminating the multi - step complex processes in the traditional process. The whole preparation process is simple and efficient. When assembling the battery, only the corresponding negative electrode needs to be attached to the electrode - electrolyte integrated structure to complete the manufacture of the secondary battery, greatly shortening the production process flow and improving the production efficiency.

[0026] 2) The present invention adopts a method of simple light irradiation to in - situ grow the electrolyte on the electrode, thereby forming an electrode - electrolyte integrated structure. This structure effectively constructs a good electrode - electrolyte contact interface, significantly promotes ion conduction, and improves the cycle stability of the battery. Taking the aqueous zinc - ion secondary battery as an example, the button battery assembled with the electrode - electrolyte integrated structure still maintains a high capacity of 200 mAh / g after cycling 900 times at a current of 0.5 A / g, while the battery without the electrode - electrolyte integrated design has a lower capacity and deactivates around 600 cycles, demonstrating the excellent cycle stability and rate performance brought by the electrode - electrolyte integrated structure. In addition, the repeatability of this battery is also excellent, indicating that this technology has good durability and reliability, and has high commercial potential and application prospects.

[0027] 3) The present invention uses a light source, which has a small floor area, is easy to operate and has low energy consumption. When preparing the condensed electrolyte, photopolymerization has several advantages compared to thermal polymerization. First, photopolymerization is usually carried out under low-temperature conditions and does not require high-temperature heating, which helps to avoid the decomposition or property changes of temperature-sensitive materials. Second, the photopolymerization reaction rate is relatively fast, and the initiation and process of the reaction can be precisely controlled by adjusting the light intensity and wavelength, thus effectively shortening the reaction time. For example, the preparation time in the present invention is only 2 minutes or even shorter, greatly improving the production efficiency. In addition, photopolymerization has spatial selectivity and can precisely control the polymerization region, which is suitable for the preparation of electrolytes that require local structures or patterning. Photopolymerization also has low energy consumption and usually only requires a low-power light source, while thermal polymerization requires high temperatures and heating equipment, resulting in large energy consumption. Another advantage is that photopolymerization can be carried out under solvent-free or low-solvent conditions, reducing the impact on the environment. Finally, the control accuracy of the photopolymerization reaction is relatively high, and it can better regulate the molecular weight distribution of the product, which is particularly important for preparing condensed electrolyte materials with specific properties. In summary, compared with thermal polymerization, the present invention using photopolymerization in the preparation of condensed electrolytes has higher reaction control accuracy, lower energy requirements and better environmental adaptability. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the electrode-electrolyte integration of the present invention.

[0029] Figure 2 It is a sample diagram of the electrode-electrolyte integration structure prepared in Example 1; among them, Figure 2 a is the top view of the sample, Figure 2 b is the side view of the sample.

[0030] Figure 3 It is the scanning electron microscope and element distribution diagram of the electrode-electrolyte integration structure prepared in Example 1; among them, Figure 3 a is the scanning electron microscope image at a scale of 300 μm, Figure 3 b is Figure 3 a partial scanning electron microscope image of a, Figure 3 c is Figure 3 a partial element distribution diagram of b.

[0031] Figure 4 It is the long-cycle performance diagram of the battery prepared in Example 1.

[0032] Figure 5 It is the rate performance diagram of the battery prepared in Example 1. Detailed Embodiments

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] See Figure 1 , when the present invention configures the electrode paste, by introducing acrylic monomers, they are evenly dispersed inside the electrode. When the electrolyte precursor solution is dropped onto the electrode, the precursor solution will penetrate into the electrode interior. Under light irradiation, the monomers inside the electrode will undergo a free radical polymerization reaction to form a polymer network. This network not only fixes the active substances of the electrode to prevent their dissolution, but also chemically cross-links with the polymer backbone in the gel electrolyte formed by the polymerization of the precursor solution. In this way, the electrode and the electrolyte are firmly bonded together to form an electrode-electrolyte integrated structure. It should be noted that the electrode-electrolyte integrated structure can not only effectively improve the contact interface between the electrode and the electrolyte, but also significantly shorten the preparation process flow of the secondary battery. Just by fitting the electrode with the corresponding electrode, the preparation of the secondary battery can be completed, thus simplifying the production process and improving the production efficiency of the secondary battery.

[0035] Example 1

[0036] (1) Preparation method of vanadium-based positive electrode introducing acrylic monomers in the present invention:

[0037] Dissolve 0.7 g of Mg 0.1 V2O5 positive electrode active material, 0.2 g of acetylene black and 0.1 g of polyvinylidene fluoride (PVDF) in 4 mL of N-methylpyrrolidone (NMP), then add 400 μL of acrylic monomer solution, and ensure uniform dispersion by magnetic stirring. Subsequently, coat it on a titanium foil current collector and dry it in a vacuum oven. Then, use a cutting machine to cut it to obtain a positive electrode sheet with a diameter of 13 mm.

[0038] (2) Configuration of the electrolyte precursor solution in the present invention:

[0039] First, dissolve 0.75 g of acrylamide monomer and 0.726 g of zinc trifluoromethanesulfonate powder in 2 mL of 0.01 M aqueous acrylic acid solution. Then, add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 1.5 mg of cross-linking agent N,N'-methylenebisacrylamide, and oscillate to make it dissolve evenly to obtain the electrolyte precursor solution.

[0040] (3) Construction method of the positive electrode-electrolyte integrated structure in the present invention:

[0041] In the present invention, ultraviolet light is used to drive the in-situ polymerization of the electrolyte precursor solution drop-coated on the positive electrode to form a positive electrode-electrolyte integrated structure. The specific implementation method is as follows: 200 μL of the precursor solution is drop-coated on the prepared positive electrode with a diameter of 13 mm, and then transferred to a 365 W xenon lamp for ultraviolet light irradiation for 2 minutes to obtain the positive electrode-electrolyte integrated structure, as Figure 1 shown in the schematic diagram and Figure 2 the physical picture. It can be found by scanning electron microscopy that the contact interface between the positive electrode and the gel fits tightly without gaps, and a large number of S and Zn elements are distributed inside the positive electrode in its elemental distribution map, that is, the gel electrolyte deeply penetrates into the positive electrode and tightly combines with it to form a positive electrode-electrolyte integrated structure, as Figure 3 shown.

[0042] (4) Assembly of the aqueous zinc-ion battery with an integrated positive electrode-electrolyte in the present invention:

[0043] Taking the assembly of a CR-2032 button aqueous zinc-ion battery as an example in the present invention. The specific method is as follows: Place the positive electrode-electrolyte integrated structure sample above the positive electrode case of the battery, then attach a zinc metal negative electrode with a diameter of 13 mm above it, then place a 1 mm thick stainless steel gasket and a shrapnel above it, and finally cover the negative electrode case of the battery, and then transfer it to a battery die-casting machine to be pressed tightly at a pressure of 50 MPa to obtain the assembled button battery.

[0044] Taking the non-integrated design as a comparison, the positive electrode prepared by the same method and the gel electrolyte prepared non-in-situ by photo-polymerization of the electrolyte precursor solution under ultraviolet light for 2 minutes are directly combined and placed above the positive electrode case of the battery, then a zinc metal negative electrode with a diameter of 13 mm is attached above it, then a 1 mm thick stainless steel gasket and a shrapnel are placed above it, and finally the negative electrode case of the battery is covered, and then transferred to a battery die-casting machine to be pressed tightly at a pressure of 50 MPa to obtain the assembled CR-2032 button battery. Then the button battery is transferred to an electrochemical workstation for long-cycle and rate performance tests, so as to draw the long-cycle and rate performance graphs.

[0045] As Figure 4 and Figure 5 shown, the assembled aqueous zinc-ion battery with an integrated positive electrode-electrolyte still maintains a high capacity of 200 mAh / g after cycling 900 times at 0.5 A / g, while the battery without the integrated electrode-electrolyte design has a lower capacity and is inactivated within 600 cycles, and also shows excellent performance at different rates from 0.1 to 1.0 A / g.

[0046] Comparative Example 1

[0047] Step 1: Dissolve 0.7 g of Mg 0.1 V2O5 cathode active material, 0.2 g of acetylene black and 0.1 g of polyvinylidene fluoride (PVDF) in 4 mL of N-methylpyrrolidone (NMP), then add 0.414 g of acrylamide monomer, and stir magnetically for 24 hours to ensure uniform dispersion. Then coat it on a titanium foil current collector and dry it in a vacuum oven at 80 °C for 12 hours. Subsequently, use a cutter to cut it into a positive electrode sheet with a diameter of 13 mm.

[0048] Step 2: First, dissolve 0.75 g of acrylamide monomer and 0.726 g of zinc trifluoromethanesulfonate powder in 2 mL of 0.01 M aqueous acrylic acid solution. Then add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 1.5 mg of crosslinking agent N,N'-methylenebisacrylamide, and oscillate to dissolve them uniformly to obtain an electrolyte precursor solution.

[0049] Step 3: Drop 200 μL of the precursor solution onto the prepared positive electrode with a diameter of 13 mm, and then transfer it to a 365 W xenon lamp for ultraviolet light irradiation for 2 minutes to obtain a positive electrode-electrolyte integrated structure.

[0050] Step 4: Place the positive electrode-electrolyte integrated structure sample above the positive electrode case of the battery. Then attach a zinc metal negative electrode with a diameter of 13 mm above it, and then place a 1 mm thick stainless steel gasket and a shrapnel above it. Finally, cover the negative electrode case of the battery, and then transfer it to a battery die-casting machine to press it tightly at a pressure of 50 MPa to obtain an assembled CR-2032 button aqueous zinc ion battery.

[0051] Compared with Example 1, in Step 1 of Comparative Example 1, acrylamide monomer was used.

[0052] Comparative Example 2

[0053] Step 1: Dissolve 0.7 g of Mg 0.1 V2O5 cathode active material, 0.2 g of acetylene black and 0.1 g of polyvinylidene fluoride (PVDF) in 4 mL of N-methylpyrrolidone (NMP), then add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, 1.5 mg of crosslinking agent N,N'-methylenebisacrylamide and 400 μL of acrylic acid solution, stir magnetically for 24 hours to ensure uniform dispersion, then coat it on a titanium foil current collector, and then transfer it to ultraviolet light for irradiation for 2 minutes to polymerize acrylic acid into polyacrylic acid, and then transfer it to a vacuum oven to dry at 80 °C for 12 hours. Subsequently, use a cutter to cut it into a positive electrode sheet with a diameter of 13 mm.

[0054] Step 2: First, dissolve 0.75 g of acrylamide monomer and 0.726 g of zinc trifluoromethanesulfonate powder in 2 mL of 0.01 M aqueous acrylic acid solution. Subsequently, add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 1.5 mg of crosslinker N,N'-methylenebisacrylamide, and shake to dissolve them uniformly to obtain the electrolyte precursor solution.

[0055] Step 3: Drop 200 μL of the precursor solution onto the prepared positive electrode with a diameter of 13 mm, and then transfer it to a 365 W xenon lamp for ultraviolet light irradiation for 2 minutes to obtain the integrated positive electrode-electrolyte structure.

[0056] Step 4: Place the integrated positive electrode-electrolyte structure sample above the positive electrode case of the battery. Subsequently, attach a zinc metal negative electrode with a diameter of 13 mm above it, then place a 1 mm thick stainless steel gasket and a shrapnel above it. Finally, cover the negative electrode case of the battery, and then transfer it to a battery die-casting machine to be pressed tightly at a pressure of 50 MPa to obtain the assembled CR-2032 button aqueous zinc-ion battery.

[0057] Compared with Example 1, in Comparative Example 2, acrylic acid monomer was in-situ polymerized into polyacrylic acid in Step 1.

[0058] Comparative Example 3

[0059] Step 1: Dissolve 0.7 g of Mg 0.1 V2O5 positive electrode active material, 0.2 g of acetylene black and 0.1 g of polyvinylidene fluoride (PVDF) in 4 mL of N-methylpyrrolidone (NMP), add 400 μL of acrylic acid solution, and magnetically stir for 24 hours to ensure uniform dispersion. Subsequently, coat it on the carbon paper current collector and dry it in a vacuum oven at 80 °C for 12 hours, and then cut it with a cutter to obtain a positive electrode sheet with a diameter of 13 mm.

[0060] Step 2: First, dissolve 0.75 g of acrylamide monomer and 0.726 g of zinc trifluoromethanesulfonate powder in 2 mL of 0.01 M aqueous acrylic acid solution. Subsequently, add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 1.5 mg of crosslinker N,N'-methylenebisacrylamide, and shake to dissolve them uniformly to obtain the electrolyte precursor solution.

[0061] Step 3: Drop 200 μL of the precursor solution onto the prepared cathode with a diameter of 13 mm, and then transfer it to a 365 W xenon lamp for ultraviolet light irradiation for 2 minutes to obtain the integrated cathode-electrolyte structure.

[0062] Step 4: Place the integrated cathode-electrolyte structure sample above the battery cathode case, then attach a zinc metal anode with a diameter of 13 mm above it, then place a 1 mm thick stainless steel gasket and a shrapnel above it, and finally cover the battery anode case, and then transfer it to a battery die-casting machine and press it tightly at a pressure of 50 MPa to obtain the assembled CR-2032 button aqueous zinc-ion battery.

[0063] Compared with Example 1, carbon paper current collector was used in Comparative Example 3.

[0064] Comparative Example 4

[0065] Step 1: Dissolve 0.7 g of Mg 0.1 V2O5 cathode active material, 0.2 g of acetylene black and 0.1 g of polyvinylidene fluoride (PVDF) in 4 mL of N-methylpyrrolidone (NMP), then add 400 μL of acrylic acid solution, and stir magnetically for 24 hours to ensure uniform dispersion, and then coat it on the titanium foil current collector, dry it in a vacuum oven at 80 °C for 12 hours, and then use a cutting machine to cut it to obtain a cathode sheet with a diameter of 13 mm.

[0066] Step 2: First, dissolve 0.75 g of acrylamide monomer and 0.726 g of zinc trifluoromethanesulfonate powder in 2 mL of 0.01 M aqueous acrylic acid solution, then add 2.5 mg of photoinitiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and 3.0 mg of crosslinking agent N,N'-methylenebisacrylamide, and oscillate to dissolve it uniformly to obtain the electrolyte precursor solution.

[0067] Step 3: Drop 200 μL of the precursor solution onto the prepared cathode with a diameter of 13 mm, and then transfer it to a 365 W xenon lamp for ultraviolet light irradiation for 2 minutes to obtain the integrated cathode-electrolyte structure.

[0068] Step 4: Place the integrated cathode-electrolyte structure sample above the battery cathode case, then attach a zinc metal anode with a diameter of 13 mm above it, then place a 1 mm thick stainless steel gasket and a shrapnel above it, and finally cover the battery anode case, and then transfer it to a battery die-casting machine and press it tightly at a pressure of 50 MPa to obtain the assembled CR-2032 button aqueous zinc-ion battery.

[0069] Compared with Example 1, different contents of crosslinking agent were used in this comparative example.

[0070] At room temperature, the discharge specific capacity of the full cells of Comparative Examples 1 to 4 versus the number of cycles was tested at a current density of 0.5 A / g, as shown in Table 1.

[0071] Table 1

[0072]

[0073] As can be seen from Table 1, the full cell assembled with the integrated cathode - electrolyte structure of the present invention has the highest discharge specific capacity, whether it is the highest discharge specific capacity or the discharge specific capacity after 100 and 200 cycles. By comparative analysis with the comparative examples, the necessity of introducing acrylic organic small molecules into the cathode of the present invention and the importance of the proportion of the crosslinking agent in the gel electrolyte and the appropriate current collector are proved. The utilization and proportion of these specific materials are the key in the present invention.

Claims

1. A method for preparing a cathode-electrolyte integrated structure for a secondary battery, characterized in that, It includes the following steps: 1) Prepare the positive electrode sheet: Mix the positive electrode active material, conductive agent, binder, solvent and acrylic monomer, then coat it on the current collector, and finally dry it to obtain the positive electrode sheet; 2) Prepare the electrolyte precursor solution: Mix the electrolyte salt, acrylamide monomer, initiator, crosslinking agent and electrolyte solvent to obtain the electrolyte precursor solution; 3) Drop-coat the electrolyte precursor solution on the positive electrode sheet and irradiate it with light to obtain an integrated electrode-electrolyte structure.

2. The preparation method of a cathode-electrolyte integrated structure for a secondary battery according to claim 1, characterized in that: In step 1), by mass, 100 parts of the positive electrode active material, 10 - 40 parts of the conductive agent, 5 - 20 parts of the binder, and 20 - 65 parts of the acrylic monomer.

3. The preparation method of a cathode - electrolyte integrated structure for a secondary battery according to claim 1, wherein: The positive electrode active material includes at least one of vanadium oxide, manganese oxide, Prussian blue, and lithium iron phosphate.

4. The preparation method of a cathode-electrolyte integrated structure for a secondary battery according to claim 1, characterized in that: In step 2), by mass, 100 parts of the electrolyte salt, 40 - 160 parts of the acrylamide monomer, 3 - 15 parts of the initiator, and 5 - 35 parts of the crosslinking agent.

5. The preparation method of a cathode-electrolyte integrated structure for a secondary battery according to claim 1, characterized in that: The initiator includes at least one of benzophenone, benzoic acid, and 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone.

6. The preparation method of a cathode - electrolyte integrated structure for a secondary battery according to claim 1, characterized in that: The crosslinking agent includes at least one of N,N'-methylenebisacrylamide, benzoyl peroxide, diisocyanatohexane, and glutaraldehyde.

7. The preparation method of a cathode-electrolyte integrated structure for a secondary battery according to claim 1, characterized in that: In step 3), the light source is ultraviolet light.

8. A cathode-electrolyte integrated structure for a secondary battery, characterized in that: Prepared by the preparation method according to any one of claims 1 - 7.

9. Use of an integrated cathode - electrolyte structure for a secondary battery according to claim 8, characterized in that: For preparing secondary batteries.

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