Rechargeable carbon fiber net-cement-based structure battery and preparation method thereof

Abstract

The present invention relates to the technical field of energy storage, and discloses a rechargeable carbon fiber web-cement-based structure battery and a preparation method thereof, the rechargeable carbon fiber web-cement-based structure battery comprises: a positive electrode, which is composed of a carbon fiber web substrate and a plurality of nickel oxide-cobalt oxide composite coatings, and the nickel oxide-cobalt oxide composite coatings are plated on the surface of the carbon fiber web through an electro-deposition process; the negative electrode is composed of a carbon fiber net substrate and a multi-layer composite iron oxide-graphene coating synthesized by an electrochemical reduction method; the electrolyte is formed by mixing cement, a nano conductive filler, ion exchange resin and a modified alkaline solution of a fluorine-containing solvent, the fluorine-containing solvent in the modified alkaline solution has ionic conductivity and can improve the charge-discharge performance of the battery through ion exchange, and the electrolyte further comprises nano aluminum oxide particles. The cement-based electrolyte and the structural electrode used by the cement-based battery can be integrated with a building structural material, so that an energy storage function of a building is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly to a rechargeable carbon fiber mesh-cement based structure battery and a preparation method thereof. Background Art

[0002] With the increasing importance of sustainable energy, especially the rapid development of renewable energy such as solar energy and wind energy, how to effectively store energy and ensure its stable supply has become an important issue. Existing energy storage technologies, especially battery technologies, are widely used in the fields of energy storage, transportation, electronic devices, etc.

[0003] In the prior art, energy storage devices are usually independent of the building structure and require additional space for installation. These energy storage devices, such as traditional battery packs or other energy storage units, usually need to be arranged in a dedicated room or machine room, increasing the complexity of building design and having low utilization efficiency of building space. In addition, these traditional energy storage devices are not directly combined with the structure of the building, resulting in the inability to fully integrate the energy management and storage functions of the building and reducing the overall energy efficiency of the building. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a rechargeable carbon fiber mesh-cement based structure battery and a preparation method thereof, which solve the problem that in the prior art, energy storage devices are usually independent of the building structure and require additional space for installation.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: A rechargeable carbon fiber mesh-cement based structure battery, comprising:

[0006] A positive electrode, composed of a carbon fiber mesh substrate and multiple layers of nickel oxide-cobalt oxide composite coatings, the nickel oxide-cobalt oxide composite layer is plated on the surface of the carbon fiber mesh through an electrodeposition process, and the composite coating has a high degree of porosity in the microstructure;

[0007] A negative electrode, composed of a carbon fiber mesh substrate and multiple layers of composite iron oxide-graphene coatings synthesized by an electrochemical reduction method, the iron oxide-graphene composite coating enhances the conductivity of the negative electrode and improves its stability during high-power charge and discharge processes;

[0008] An electrolyte, which is a mixture of cement, nano conductive fillers, ion exchange resins, and a modified alkaline solution containing a fluorinated solvent. The fluorinated solvent in the modified alkaline solution has ionic conductivity and can improve the charge and discharge performance of the battery through ion exchange. The electrolyte also contains nano alumina particles.

[0009] Preferably, the grid size of the carbon fiber mesh is 4 mm to 6 mm, the longitudinal fiber bundle is 10K to 14K, the vertical fiber bundle is 5K to 8K, and the thickness of the mesh cloth is 0.8 mm to 1.2 mm.

[0010] Preferably, the mass ratio of the electrolyte is cement: nano conductive filler: ion exchange resin: fluorinated solvent = 1: 0.1: 0.3: 0.6.

[0011] Preferably, the particle size range of the nano-aluminum oxide particles used in the electrolyte is 50 to 200 nanometers, having a relatively high surface area.

[0012] Preferably, the interaction between the nickel oxide-cobalt oxide composite coating and the iron oxide-graphene composite coating in the composite electrode material generates an efficient electron-ion transport channel.

[0013] Preferably, the ionic conductivity of the battery is in the range of 3.0×10-3 S / cm to 6.0×10-3 S / cm, and the battery energy density is in the range of 8.0 Wh / m 2 to 12.0 Wh / m 2 range, and it can maintain stable discharge for a long time at a high current density.

[0014] Preferably, a preparation method of a rechargeable carbon fiber mesh-cement-based structural battery includes the following steps:

[0015] S1. Surface-treat the carbon fiber mesh substrate to remove oil stains and impurities, and enhance the hydrophilicity of the carbon fiber surface through oxygen plasma treatment;

[0016] S2. Electroplate a multi-layer nickel oxide-cobalt oxide composite coating on the positive electrode surface of the carbon fiber mesh through an electrodeposition process;

[0017] S3. Electroplate an iron oxide-graphene composite coating on the negative electrode surface of the carbon fiber mesh through an electrochemical reduction method;

[0018] S4. Prepare a modified cement-based electrolyte, mix cement, nano conductive filler, ion exchange resin and fluorinated solvent to make the solution uniformly mixed, and fully disperse the nano-aluminum oxide particles in the electrolyte matrix;

[0019] S5. Pour the cement-based electrolyte slurry into a mold. When the slurry is not completely hardened, sequentially place the carbon fiber mesh electrode electroplated with the positive electrode material and the carbon fiber mesh electrode electroplated with the negative electrode material into the mold in sequence;

[0020] S6. Pour the cement-based electrolyte between the electrodes to ensure good contact between the electrolyte and the electrodes. After the battery assembly is completed, cure it for 24 to 48 hours. After curing, take out the mold and continue to cure for 7 to 14 days;

[0021] S7. Electrochemically test the assembled battery, including testing parameters such as ionic conductivity, energy density, charge-discharge efficiency, and cycle stability.

[0022] Preferably, in the S1 step, the thickness of the composite coating is 2 μm to 5 μm, and titanium oxide quantum dots are introduced into the structure of the composite coating. The electrodeposition process is carried out at a current intensity of 1.0 A, and the electrodeposition time is 4 to 6 hours.

[0023] Preferably, in the S2 step, the thickness of the composite coating is 1 μm to 3 μm, the mass ratio of graphene to iron oxide is 2:1, the current intensity of the electrochemical reduction method is 0.5 A to 1.0 A, and the time is 3 hours to 5 hours.

[0024] Preferably, in the S5 step, the electrode spacing is controlled within the range of 1.5 mm to 2.5 mm.

[0025] The present invention provides a rechargeable carbon fiber mesh - cement-based structural battery and its preparation method. It has the following beneficial effects:

[0026] 1. Since the cement-based electrolyte and structural electrodes used in the cement-based battery of the present invention can be integrated with building structural materials to realize the energy storage function of buildings, the design of this "intelligent concrete structure" enables the battery to not only serve as an energy storage unit but also as a part of the building, reducing space occupation and simultaneously enhancing the energy management ability of the building.

[0027] 2. By introducing advanced composite materials (such as titanium oxide quantum dots, graphene, etc.) into the positive and negative electrode materials of the present invention, not only the conductivity of the electrodes is improved, but also the stability of the battery under high current density is enhanced. These materials can effectively reduce the degradation of the electrodes during the charge-discharge process, extend the service life of the battery, and improve its high-temperature resistance, corrosion resistance, and anti-cycle attenuation ability.

[0028] 3. By optimizing the formula of the cement-based electrolyte and adding functional ion exchange resins and modified alkaline solutions, the ionic conductivity of the cement-based battery is significantly improved. This enables the battery to more efficiently transport ions during the charge-discharge process, reduces the resistance inside the battery, thereby improving the charge-discharge efficiency and power density of the battery. The higher ionic conductivity enhances the overall performance of the battery, especially in application scenarios with high power and high current density.

[0029] 4. By using a carbon fiber mesh as the electrode substrate and plating an active material with a high specific surface area (such as nickel oxide, cobalt oxide, iron oxide, etc.) on its surface, the energy density and power density of the battery are improved. The high energy density enables the battery to store more energy in a smaller volume, making it suitable for large-scale energy storage systems such as buildings and infrastructure. The high power density, on the other hand, allows the battery to release a large amount of energy in a short time, making it suitable for fast charge and discharge applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the design model of the rechargeable carbon fiber mesh cement battery of the present invention;

[0031] Figure 2 It is a flow chart of the preparation process of the carbon fiber mesh cement battery of the present invention;

[0032] Figure 3 It is a schematic diagram of the discharge energy and energy density of the carbon fiber cement battery of the present invention;

[0033] Figure 4 It is a flow chart of the preparation method of a rechargeable carbon fiber mesh - cement - based structure battery of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0035] Please refer to the attached Figure 1 - attached Figure 3 , an embodiment of the present invention provides a rechargeable carbon fiber mesh - cement - based structure battery, including:

[0036] A positive electrode, which is composed of a carbon fiber mesh substrate and multiple layers of nickel oxide - cobalt oxide composite coatings. The nickel oxide - cobalt oxide composite layer is plated on the surface of the carbon fiber mesh through an electrodeposition process, and the composite coating has a highly porous microstructure;

[0037] A negative electrode, which is composed of a carbon fiber mesh substrate and multiple layers of composite iron oxide - graphene coatings synthesized by an electrochemical reduction method. The iron oxide - graphene composite coating enhances the conductivity of the negative electrode and improves its stability during high - power charge and discharge processes;

[0038] An electrolyte, which is formed by mixing cement, nano-conductive fillers, ion exchange resins, and a modified alkaline solution containing a fluorinated solvent. The fluorinated solvent in the modified alkaline solution has ionic conductivity and can improve the charge and discharge performance of the battery through ion exchange. The electrolyte also contains nano-aluminum oxide particles.

[0039] Specifically, due to the cement-based electrolyte and structural electrodes used in the cement-based battery, it can be integrated with building structural materials to achieve the energy storage function of the building. The design of this "intelligent concrete structure" enables the battery to not only serve as an energy storage unit but also as a part of the building, reducing space occupancy while enhancing the building's energy management capabilities. This design innovation provides a new energy solution for the construction industry and has great market application prospects.

[0040] One of the greatest innovations of the present invention is to create the concept of "intelligent concrete structure" by integrating the cement-based battery with building materials. This design enables the building to simultaneously have the energy storage function, reduce space occupancy, and enhance the building's energy management capabilities. Different from traditional batteries, the present invention not only serves as an energy storage device but also as a part of the building, with broad market application prospects, especially for intelligent buildings and sustainable urban construction. This innovation provides a brand-new building energy storage solution and changes the application mode of batteries in buildings.

[0041] The grid size of the carbon fiber mesh is 4 mm to 6 mm, the longitudinal fiber bundle is 10K to 14K, the vertical fiber bundle is 5K to 8K, and the thickness of the mesh cloth is 0.8 mm to 1.2 mm.

[0042] Specifically, the setting of this range ensures that the carbon fiber mesh substrate has good mechanical strength and electrical conductivity in the application of the battery, while being able to maintain a high electrochemical reaction efficiency. By optimizing the size of the fiber bundle and the grid size, the volume expansion effect of the electrode material during the charge and discharge process of the battery can be reduced while increasing the conductivity, which helps to extend the service life of the battery. The reasonable grid size and fiber bundle size can also ensure the stability and reliability of the electrode, providing stable discharge for a longer time under high power and high current density.

[0043] The mass ratio of the electrolyte is cement:nano-conductive filler:ion exchange resin:fluorinated solvent = 1:0.1:0.3:0.6.

[0044] Specifically, this ratio design plays a significant role in improving the conductivity and overall stability of the battery. The nano-conductive filler provides stronger conductivity through its large specific surface area, reduces the internal resistance of the battery, and improves the charge-discharge efficiency of the battery. The ion exchange resin optimizes the ion migration path in the battery through its ion exchange ability, improving the ionic conductivity of the battery. The addition of the fluorinated solvent effectively enhances the performance stability of the electrolyte at high current densities, especially showing better conductivity in extreme environments. This electrolyte ratio optimizes the performance of the cement-based battery, enabling it to still operate stably under high current and long-term use, and enhancing the service life and reliability of the battery.

[0045] The particle size range of the nano-aluminum oxide particles used in the electrolyte is 50 to 200 nanometers, and they have a high surface area.

[0046] Specifically, the selection of this range plays an important role. The smaller particle size ensures that the particles can be evenly dispersed in the electrolyte, thereby improving the overall mechanical strength, corrosion resistance, and stability of the electrolyte. The nano-aluminum oxide particles can effectively enhance the compressive resistance of the electrolyte, preventing the battery from cracking or degrading due to internal stress changes during the charge-discharge process. In addition, the surface effect of the nano-particles helps to improve the conductivity of the electrolyte and enhance its ability to resist performance degradation after long-term use. By selecting the appropriate particle size, the long-term stability and reliability of the battery can be better controlled, ensuring its adaptability in complex environments.

[0047] The interaction between the nickel oxide-cobalt oxide composite coating and the iron oxide-graphene composite coating in the composite electrode material generates an efficient electron-ion transport channel.

[0048] Specifically, the nickel oxide-cobalt oxide composite coating used in the positive electrode and the iron oxide-graphene composite coating in the negative electrode generate an efficient electron-ion transport channel through their interaction, greatly enhancing the cycle life and energy efficiency of the battery. The composite structure of nickel oxide and cobalt oxide can effectively slow down the structural decline of the electrode material during the charge-discharge process, extending the service life of the battery. The addition of graphene enhances the electron conductivity of the negative electrode material, enabling the battery to withstand higher current densities and ensuring the stability of the battery during high-power charge-discharge processes. The interaction between the two not only improves the performance of the battery but also significantly reduces the internal resistance of the battery, improving the performance of the battery in high-efficiency charge-discharge and making the battery more suitable for application scenarios that require fast charge-discharge.

[0049] The ionic conductivity of the battery is in the range of 3.0×10-3 S / cm to 6.0×10-3 S / cm, and the battery energy density is 8.0 Wh / m 2 to 12.0 Wh / m 2within a certain range and can maintain stable discharge for a long time under high current density.

[0050] Specifically, the design of this performance range enables the battery to meet the requirements of various different application scenarios. The high ionic conductivity ensures that the battery can transfer ions more efficiently during charge and discharge, thereby improving the charge and discharge efficiency and the power density of the battery. The high energy density ensures that the battery can provide more energy with a smaller volume and weight, making it suitable for large-scale energy management projects such as building and infrastructure energy storage. By optimizing the ionic conductivity and energy density of the battery, it is ensured that the battery maintains a stable output during long-term use and has good sustainability and high-efficiency energy storage capabilities.

[0051] Please refer to the attached Figure 4 , a method for preparing a rechargeable carbon fiber mesh-cement-based structure battery, comprising the following steps:

[0052] S1. Surface-treat the carbon fiber mesh substrate to remove oil stains and impurities, and enhance the hydrophilicity of the carbon fiber surface through oxygen plasma treatment;

[0053] S2. Electroplate a multi-layer nickel oxide-cobalt oxide composite coating on the positive electrode surface of the carbon fiber mesh through an electrodeposition process;

[0054] S3. Electroplate an iron oxide-graphene composite coating on the negative electrode surface of the carbon fiber mesh through an electrochemical reduction method;

[0055] S4. Prepare a modified cement-based electrolyte, mix cement, nano-conductive filler, ion exchange resin and fluorinated solvent to make the solution uniformly mixed, and fully disperse the nano-aluminum oxide particles in the electrolyte matrix;

[0056] S5. Pour the cement-based electrolyte slurry into a mold. Before the slurry is completely hardened, sequentially place the carbon fiber mesh electrode electroplated with the positive electrode material and the carbon fiber mesh electrode electroplated with the negative electrode material into the mold in sequence;

[0057] S6. Pour the cement-based electrolyte between the electrodes to ensure good contact between the electrolyte and the electrodes. After the battery assembly is completed, cure it for 24 to 48 hours. After curing, take out the mold and continue to cure for 7 to 14 days;

[0058] S7. Conduct electrochemical performance tests on the assembled battery, including tests of ionic conductivity, energy density, charge and discharge efficiency, and cycle stability parameters.

[0059] In step S1, the thickness of the composite coating is 2 μm to 5 μm, and titanium oxide quantum dots are introduced into the structure of the composite coating. The electrodeposition process is carried out at a current intensity of 1.0 A, and the electrodeposition time is 4 to 6 hours.

[0060] Specifically, the thickness of the composite coating is controlled within the range of 2 μm to 5 μm, which can not only ensure that the coating has a sufficient amount of active material, thereby improving the reaction efficiency of the positive electrode, but also avoid the decrease in conductivity and the increase in ion transport resistance caused by an overly thick coating. The thickness range optimizes the balance between electron conduction and ion diffusion, ensuring that the positive electrode maintains good performance during high-rate charge and discharge.

[0061] The introduction of titanium oxide quantum dots significantly improves the conductivity and surface area of the positive electrode material. Quantum dots have a high specific surface area and excellent electron conduction performance, which can provide more reaction sites on the surface of the positive electrode, thereby enhancing the redox reaction efficiency of the electrode. In addition, titanium oxide quantum dots can improve the stability of the positive electrode material during long-term cycling, reducing material shedding and performance degradation during charge and discharge.

[0062] The current intensity is 1.0 A and the time is 4 to 6 hours, which optimizes the electrodeposition rate and the uniformity of the coating. A lower current intensity and a moderate deposition time can prevent cracks or particle accumulation on the surface of the coating, ensuring the denseness and flatness of the nickel oxide-cobalt oxide composite coating, thereby reducing the interfacial resistance of the electrode and improving the overall charge and discharge efficiency of the battery.

[0063] In step S2, the thickness of the composite coating is 1 μm to 3 μm, the mass ratio of graphene to iron oxide is 2:1, the current intensity of the electrochemical reduction method is 0.5 A to 1.0 A, and the time is 3 hours to 5 hours.

[0064] Specifically, the thickness of the negative electrode composite coating is controlled within the range of 1 μm to 3 μm, ensuring good coverage of the iron oxide and graphene coatings on the surface of the negative electrode, while avoiding the increase in ion transport resistance caused by an overly thick coating. The thinner coating can quickly respond to changes in current and is suitable for high-rate discharge scenarios.

[0065] The 2:1 ratio of graphene to iron oxide achieves a balance between improving conductivity and enhancing reaction activity. As a conductive enhancer, graphene significantly improves the electron conduction performance of the negative electrode composite coating, reducing the resistance of electron transport; as a reaction active substance, iron oxide can stably provide ion transport channels, and the two work together to enhance the overall performance of the negative electrode.

[0066] The current intensity is controlled within the range of 0.5 A to 1.0 A, and the operating time is 3 hours to 5 hours, which helps to achieve a uniform distribution of the coating and improve the bonding strength between iron oxide and graphene. A lower current intensity can prevent damage to the internal structure of the coating, optimize the microstructure of the composite material, thereby reducing the material shedding phenomenon of the negative electrode during cycling.

[0067] In step S5, the electrode spacing is controlled within the range of 1.5 mm to 2.5 mm.

[0068] Specifically, this range can effectively improve the ion transport efficiency and reduce the internal resistance of the battery. A reasonable electrode spacing can ensure sufficient contact area of the electrolyte between the positive and negative electrodes, thereby enhancing the charge and discharge efficiency of the battery. At the same time, the thickness of the electrolyte layer is designed within the range of 2 mm to 2.5 mm, effectively improving the stability of the battery and reducing the risk of thermal runaway when the battery operates under high load. By precisely controlling the electrode spacing and the thickness of the electrolyte layer, the present invention can ensure that the battery still maintains good performance under high current density and can meet the application requirements of large-scale energy storage.

[0069] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rechargeable carbon fiber mesh-cement-based structural battery, characterized in that: include: The positive electrode is composed of a carbon fiber mesh substrate and a multi-layer nickel oxide-cobalt oxide composite coating, wherein the nickel oxide-cobalt oxide composite layer is plated on the surface of the carbon fiber mesh by an electrodeposition process, and the composite coating has a high degree of porosity in microstructure; A negative electrode, which is composed of a carbon fiber mesh substrate and a multilayer composite iron oxide-graphene coating synthesized by an electrochemical reduction method, wherein the iron oxide-graphene composite coating enhances the conductivity of the negative electrode; The electrolyte is a mixture of cement, nano-conductive filler, ion exchange resin and a modified alkaline solution of a fluorine-containing solvent. The fluorine-containing solvent in the modified alkaline solution has ion conductivity and can improve the charge and discharge performance of the battery through ion exchange. The electrolyte also contains nano-alumina particles.

2. The rechargeable carbon fiber mesh-cement-based structural battery according to claim 1, characterized in that: The mesh size of the carbon fiber mesh is 4 mm to 6 mm, the longitudinal fiber bundle is 10K to 14K, the vertical fiber bundle is 5K to 8K, and the thickness of the mesh cloth is 0.8 mm to 1.2 mm.

3. The rechargeable carbon fiber mesh-cement-based structural battery according to claim 1, characterized in that: The mass ratio of the electrolyte is cement: nano conductive filler: ion exchange resin: fluorine-containing solvent = 1:0.1:0.3:0.

6.

4. The rechargeable carbon fiber mesh-cement-based structural battery according to claim 1, characterized in that: The nano-alumina particles used in the electrolyte have a particle size range of 50 to 200 nanometers and have a high surface area.

5. The rechargeable carbon fiber mesh-cement-based structural battery according to claim 1, characterized in that: The interaction between the nickel oxide-cobalt oxide composite coating and the iron oxide-graphene composite coating in the composite electrode material will produce a highly efficient electron-ion transmission channel.

6. The rechargeable carbon fiber mesh-cement-based structural battery according to claim 1, characterized in that: The ionic conductivity of the battery is in the range of 3.0×10-3S / cm to 6.0×10-3S / cm, and the battery energy density is 8.0Wh / m 2 Up to 12.0Wh / m 2 range, and can maintain stable discharge for a long time at high current density.

7. A method for preparing a rechargeable carbon fiber mesh-cement-based structural battery, characterized in that: The rechargeable carbon fiber mesh-cement-based structural battery according to any one of claims 1 to 6 comprises the following steps: S1, treating the surface of the carbon fiber mesh substrate to remove oil stains and impurities, and enhancing the hydrophilicity of the carbon fiber surface by oxygen plasma treatment; S2, coating the positive electrode surface of the carbon fiber mesh with a multilayer nickel oxide-cobalt oxide composite coating by an electrodeposition process; S3, coating the negative electrode surface of the carbon fiber mesh with an iron oxide-graphene composite coating by an electrochemical reduction method; S4, preparing a modified cement-based electrolyte, mixing cement, nano-conductive filler, ion exchange resin and fluorine-containing solvent, so that the solution is uniformly mixed and the nano-alumina particles are fully dispersed in the electrolyte matrix; S5, pouring the cement-based electrolyte slurry into the mold, and when the slurry is not completely hardened, placing the carbon fiber mesh electrode electroplated with the positive electrode material and the carbon fiber mesh electrode electroplated with the negative electrode material into the mold in sequence; S6. Pour the cement-based electrolyte between the electrodes to ensure good contact between the electrolyte and the electrodes. After the battery is assembled, cure it for 24 to 48 hours. After curing, remove the mold and continue curing for 7 to 14 days. S7. Conduct electrochemical performance tests on the assembled batteries, including tests on ionic conductivity, energy density, charge and discharge efficiency, and cycle stability parameters.

8. The method for preparing a rechargeable carbon fiber mesh-cement-based structural battery according to claim 7, characterized in that: In the step S1, the thickness of the composite coating is 2 μm to 5 μm, and titanium oxide quantum dots are introduced into the structure of the composite coating. The electrodeposition process is carried out at a current intensity of 1.0 A, and the electrodeposition time is 4 to 6 hours.

9. The method for preparing a rechargeable carbon fiber mesh-cement-based structural battery according to claim 7, characterized in that: In the step S2, the thickness of the composite coating is 1 μm to 3 μm, the mass ratio of graphene to iron oxide is 2:1, the current intensity of the electrochemical reduction method is 0.5 A to 1.0 A, and the time is 3 hours to 5 hours.

10. The method for preparing a rechargeable carbon fiber mesh-cement-based structural battery according to claim 7, characterized in that: In the step S5, the electrode spacing is controlled within a range of 1.5 mm to 2.5 mm.

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