Function-enhanced storage battery plate coating paper and production process thereof

Abstract

The invention relates to the technical field of papermaking, and particularly provides function-enhanced storage battery plate coating paper and a production process thereof. The coated paper comprises a base paper layer, a dispersion layer and a conductive layer which are stacked in sequence, wherein the base body paper layer comprises a cellulose base body; the dispersion layer comprises a solid phase layer formed by an interfacial agent, and the interfacial agent comprises at least one of a chitosan modified interfacial agent, a chitosan-based modifier, polyethyleneimine and polypyrrole-polyethylene glycol; the conductive layer comprises a three-dimensional interconnection network structure formed by carbon nanotubes and graphene oxide in the dispersion layer. According to the invention, a dispersion layer is constructed on a cellulose matrix, and uniform dispersion and strong adsorption of a nano material are realized through a dispersion layer-conductive synergistic effect, so that the conductivity and mechanical binding force of the coating are remarkably improved; meanwhile, the interfacial agent layer can effectively buffer stress, and the bending resistance and the cycle stability of the coated board paper are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking, and in particular to a functionally enhanced battery coated paper and a production process thereof. Background Art

[0002] Traditional battery electrodes often use metal foil or paper-based carriers to hold active materials, with a coating forming a conductive layer to enable charge transfer and energy storage. In recent years, carbon nanotubes and graphene oxide have been widely used to improve the rate performance and cycle life of electrodes due to their excellent conductivity and specific surface area. However, these nanomaterials tend to agglomerate in aqueous or organic phases, resulting in a discontinuous conductive coating network and increased resistance, making it difficult to significantly improve the battery's high-rate discharge performance. Furthermore, existing technologies often focus on single-step dispersion modification or coating parameter optimization.

[0003] To this end, there is an urgent need for a coated paper that can improve electrical conductivity and mechanical bonding to meet the performance requirements of high-rate discharge and long cycle life, while taking into account consistency and repeatability in industrial production. Summary of the Invention

[0004] The present invention provides a functionally enhanced battery coated paper and a production process thereof. A dispersion layer is constructed on a cellulose substrate, and through the synergistic effect of the dispersion layer and conductivity, uniform dispersion and strong adsorption of nanomaterials are achieved, significantly improving the conductivity and mechanical bonding strength of the coating. At the same time, the surfactant layer can effectively buffer stress and enhance the bending resistance and cyclic stability of the coated paper.

[0005] The present invention provides a functional enhanced battery coated paper, which comprises a base paper layer, a dispersion layer and a conductive layer stacked in sequence; wherein the base paper layer comprises a cellulose matrix; the dispersion layer comprises a solid phase layer formed by a surfactant, and the surfactant comprises at least one of a chitosan modified surfactant, a chitosan-based modifier, polyethyleneimine, and polypyrrole-polyethylene glycol; and the conductive layer comprises a three-dimensional interconnected network structure formed by carbon nanotubes and graphene oxide in the dispersion layer.

[0006] In any of the above technical solutions, in the dispersion layer, the mass concentration of the surfactant in the aqueous phase is 0.1-1.0 wt.%.

[0007] In any of the above technical solutions, in the conductive layer, the total content of carbon nanotubes and graphene oxide is 5-15 wt.%, and the mass ratio of carbon nanotubes to graphene oxide is 1:(1-4).

[0008] The present invention provides a production process for functionally enhanced battery coated paper, which is used to produce any of the functionally enhanced battery coated paper mentioned above. The production process comprises the following steps: S100, dissolving a surfactant in deionized water, adding a dispersant and performing ultrasonic treatment to prepare a surfactant solution with a concentration of 0.1-1.0wt.%; S200, adding carbon nanotubes and graphene oxide to the surfactant solution and performing dispersion treatment to obtain a conductive coating; S300, coating the surface of a substrate paper layer with the conductive coating, and sequentially performing cross-linking and curing treatment and post-treatment to obtain coated paper.

[0009] In any of the above technical solutions, in step S100, the temperature of the ultrasonic treatment is 20-30° C., the power of the ultrasonic treatment is 200-400 W, and the dispersant includes at least one of sodium lauryl sulfate and polyethylene glycol.

[0010] In any of the above technical solutions, in step S200, the dispersion processing time is 20-30 minutes, and the power is 200-400w.

[0011] In any of the above technical solutions, in step S200, the viscosity of the conductive coating is 200-500 mPa·s, and the solid content of the conductive coating is 12-20 wt.%.

[0012] In any of the above technical solutions, in step S300, the coating amount of the coating process is 20-30g / m 2 The cross-linking and curing treatment temperature is 80-120 ° C, the hot pressing is 0.1-0.3 MPa, and the time is 5-10 min.

[0013] In any of the above technical solutions, in step S300, the crosslinking agent used in the crosslinking and curing treatment is at least one of glutaraldehyde or epichlorohydrin, and the amount of the crosslinking agent is 0.2-1.0 wt.% of the mass of the solid phase component.

[0014] In any of the above technical solutions, in step S300, the post-processing includes cleaning, drying, and soft calendering; wherein, the cleaning is performed by cleaning the coated paper surface with deionized water and adjusting the surface pH to 6.5-7.5; the drying is performed by hot air drying at 60-80°C for 30-60 minutes; and the soft calendering is performed 1-3 times at 80-100°C and a line pressure of 60-100 kN / m.

[0015] After adopting the technical solution of the present invention, the technical effects that can be achieved are as follows: 1. By constructing a solid-phase dispersion layer containing a surfactant between the cellulose matrix and the conductive layer, and self-assembling a three-dimensional interconnected carbon nanotube / graphene oxide network within this layer, the close adsorption and high-density interconnection between the materials significantly reduces the internal resistance of the electrode, greatly improving the conductivity and electron / ion transport rate, providing a solid guarantee for the battery's high-rate discharge performance; 2. The flexible buffering effect and covalent cross-linking curing treatment of the dispersion layer enable a strong interfacial bond between the coating and the cellulose matrix. At the same time, the multi-layered microstructure effectively disperses volume expansion stress during repeated bending, curling, and charge-discharge cycles, significantly improving the mechanical durability and cycle life of the coated paper. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0019] Traditional battery electrodes often use metal foil or paper-based carriers to hold active materials, with a coating forming a conductive layer to enable charge transfer and energy storage. In recent years, carbon nanotubes and graphene oxide have been widely used to improve the rate performance and cycle life of electrodes due to their excellent conductivity and specific surface area. However, these nanomaterials tend to agglomerate in aqueous or organic phases, resulting in a discontinuous conductive coating network and increased resistance, making it difficult to significantly improve the battery's high-rate discharge performance. Furthermore, existing technologies often focus on single-step dispersion modification or coating parameter optimization.

[0020] To this end, this embodiment provides a functional enhanced battery coated paper, which includes a base paper layer, a dispersion layer and a conductive layer stacked in sequence; wherein the base paper layer includes a cellulose matrix; the dispersion layer includes a solid phase layer formed by a surfactant, and the surfactant includes at least one of a chitosan-modified surfactant, a chitosan-based modifier, polyethyleneimine, and polypyrrole-polyethylene glycol; and the conductive layer includes a three-dimensional interconnected network structure formed by carbon nanotubes and graphene oxide in the dispersion layer.

[0021] Preferably, a solid-phase dispersion layer composed of a chitosan-modified surfactant, polyethyleneimine, or polypyrrole-polyethylene glycol is introduced between the cellulose matrix and the conductive layer. The surfactant tightly adsorbs to the carbon nanotubes and graphene oxide in the dispersion layer, acting on the surface of the nanomaterials, inhibiting aggregation and improving wettability, thereby self-assembling a continuous three-dimensional interconnected conductive network within the layer. This network not only significantly reduces the internal resistance of the electrode and improves conductivity, but also strengthens the interfacial bonding strength between the coating and the cellulose matrix through the flexible buffering effect of the dispersion layer, significantly improving the mechanical durability and cycling stability of the coated paper. This synergistic mechanism takes into account both electrical and mechanical properties, providing a reliable electrode carrier for high-rate discharge and long-life secondary batteries.

[0022] Furthermore, in the dispersion layer, the mass concentration of the surfactant in the aqueous phase is 0.1-1.0wt.%, which ensures that its molecules can be fully adsorbed on the surfaces of carbon nanotubes and graphene oxide in the aqueous phase, and will not spontaneously form large-scale micelles due to excessively high concentration, thereby reducing the dispersion efficiency; within this concentration range, the surfactant molecules interact with the aqueous phase through their hydrophilic groups and with the surface of the nanomaterials through their lipophilic groups, thereby significantly reducing the interfacial tension between the materials and inhibiting the agglomeration of nanotubes and graphene oxide; at the same time, the uniform solid phase layer formed by it can provide a stable nanomaterial carrier, which helps to construct a high-density, continuous three-dimensional conductive network in the subsequent self-assembly process, thereby improving the conductivity, dispersion uniformity and coating adhesion of the coated paper.

[0023] Preferably, in the conductive layer, the total content of carbon nanotubes and graphene oxide is 5-15wt.%, and the mass ratio of carbon nanotubes to graphene oxide is 1:(1-4), which can satisfy the formation of a conductive network while avoiding material embrittlement and pore closure caused by excessive accumulation: carbon nanotubes use their high longitudinal conductivity to construct a one-dimensional bridge connection path, and graphene oxide disperses and supports the nanotube network with a two-dimensional large plane. The two compensate each other and synergize under appropriate proportions, which can significantly reduce the internal resistance of the electrode and increase the electron / ion transmission rate; at the same time, the interlayer force of graphene oxide and the flexible fiber skeleton of carbon nanotubes jointly improve the structural stability and mechanical toughness of the coating, ensuring that the conductive network will not break and fail during repeated bending and cycling.

[0024] Furthermore, the base paper layer is preferably an acid- and alkali-resistant cellulose base with a porosity of 60%-75%, which can maintain structural stability when in contact with the electrolyte and prevent the fiber base from being degraded due to acid and alkali corrosion; the higher porosity can not only provide sufficient capillary channels to promote rapid infiltration of the electrolyte and ion diffusion, but also form a good mechanical bite in the dispersion layer and the conductive layer to achieve deep embedding of the nano-conductive material and the base; at the same time, the pore structure buffers the volume expansion during the charge and discharge process, reduces the accumulation of internal stress, and helps to maintain the overall conductive continuity and cycle life of the electrode, thereby taking into account both electrochemical performance and mechanical reliability.

[0025] Specifically, this embodiment also provides a production process for a functionally enhanced battery coated paper, the production process comprising the following steps: S100, dissolving a surfactant in deionized water, adding a dispersant, and performing ultrasonic treatment to prepare a surfactant solution with a concentration of 0.1-1.0 wt.%; S200, adding carbon nanotubes and graphene oxide to a surfactant solution for dispersion treatment to obtain a conductive coating; S300, coating the conductive coating on the surface of the substrate paper layer, and sequentially performing cross-linking and curing treatment and post-treatment to obtain coated paper.

[0026] Preferably, in step S100, the surfactant and dispersant are dissolved in deionized water and treated under ultrasonic conditions at 20-30°C and 200-400W. This can generate strong microflows and shear forces in the liquid phase through the ultrasonic cavitation effect, quickly breaking up the dispersant / surfactant aggregates and forming a uniform molecular or micellar distribution. The dispersant further reduces the interfacial tension between the aqueous phase and the nanomaterial, allowing the surfactant molecules to be efficiently adsorbed on the surfaces of carbon nanotubes and graphene oxide, providing sufficient active sites for the subsequent dispersion and stabilization of the nanomaterial. This process significantly improves the dispersion uniformity and anti-agglomeration ability of the nanomaterial in the aqueous phase, ensuring that the conductive coating has controllable viscosity and stability, thereby forming a high-density, continuous three-dimensional conductive network during subsequent coating and self-assembly, and improving the overall conductivity and interlayer bonding strength of the coated paper.

[0027] Preferably, in step S200, carbon nanotubes and graphene oxide are added to a surfactant solution and dispersed for 20-30 minutes at a power of 200-400W. The tiny bubbles generated by ultrasonic cavitation collapse at a high speed, generating strong local impact and shear force, breaking the van der Waals force and hydrogen bond between the materials. Combined with the adsorption of the surfactant to the surface of the nanomaterial to form a passivation coating, the double synergistic effect inhibits the re-agglomeration phenomenon, which can effectively peel off the agglomerated bundles on the carbon nanotubes and the interlayer aggregation of graphene oxide, making the nanomaterial highly dispersed in the liquid phase; at the same time, the presence of the dispersant further reduces the interfacial tension, ensuring that the nanomaterial remains uniformly dispersed throughout the treatment process.

[0028] Furthermore, the conductive coating has a viscosity of 200-500 mPa·s. This moderate viscosity range ensures that the coating is neither too thin, resulting in a thin and uneven coating, nor too thick, affecting the smooth flow of the coating head. A solids content of 12-20 wt.% provides sufficient nano-conductive fillers to form a continuous network while avoiding particle deposition or coating cracking caused by excessive solids content. The concentration of nanomaterials in the coating directly affects its rheological properties and self-assembly behavior. Surfactants and dispersants disperse and bridge the nanotubes and graphene oxide in the micelles or coating layer, making the system shear-thinning. The viscosity decreases during shear, facilitating coating. After coating, the coating returns to a higher viscosity, maintaining the coating morphology and the spatial distribution of the conductive material, thus forming a dense, continuous three-dimensional conductive network.

[0029] Preferably, in step S300, the conductive coating is applied to the surface of the substrate paper layer, which is a key process for constructing the conductive layer of the coated paper. The coating amount is controlled at 20-30 g / m 2 , which ensures that the conductive material forms a continuous and dense conductive path while avoiding cracking or loss of flexibility caused by excessive coating thickness. A moderate coating amount helps maintain the flexibility of the paper base and forms good compatibility with the nanomaterial network, achieving a balance between high conductivity and mechanical processability.

[0030] Furthermore, cross-linking and curing treatment is the core step to improve the structural stability and interfacial bonding strength of the coating. Hot pressing treatment at 80-120°C and 0.1-0.3MPa for 5-10 minutes can activate the chemical reaction between the cross-linking agent and the surfactant or the functional groups on the surface of the nanomaterial. Glutaraldehyde or epichlorohydrin is selected as the cross-linking agent, with a mass accounting for 0.2-1.0wt% of the solid phase component. Stable covalent bonds can be formed through Schiff base reaction or epoxy ring-opening reaction, effectively enhancing the adhesion between the dispersed layer and the conductive layer, and between the conductive layer and the substrate, constructing a densely interconnected three-dimensional conductive network structure, and improving the durability and stability of the coating in an electrochemical environment.

[0031] Furthermore, the post-processing step further optimizes the surface quality and performance of the coated paper. The cleaning process uses deionized water to remove free small molecules or unreacted products remaining in the coating process, and adjusts the surface pH value to 6.5-7.5 to ensure that the material has good stability in the battery electrolyte environment. The drying process is carried out by hot air drying at 60-80℃ for 30-60min to promote the volatilization of residual water and the complete cross-linking reaction, and avoid defects such as wrinkling and delamination of the coating due to moisture. The soft calendering treatment is carried out 1-3 times at 80-100℃ and 60-100kN / m, which effectively improves the flatness and surface density of the coating, makes the conductive network more uniform, and improves the overall conductive performance and the fit between the coating and the paper base.

[0032] In general, the present invention systematically solves the technical problems of serious nanomaterial agglomeration, poor conductivity, and insufficient adhesion in traditional conductive coatings by constructing a three-layer collaborative structure of "base paper layer-dispersion layer-conductive layer". By introducing chitosan modifiers, polyethyleneimine and other surfactants to construct a dispersion layer, not only are carbon nanotubes and graphene oxide effectively dispersed and stabilized, but they are also prompted to self-assemble on the paper base surface to form a high-density, continuous three-dimensional conductive network, greatly improving the conductivity and cycle stability of the coating. At the same time, it ensures that the coating structure is dense, the adhesion is strong, and the film formation is uniform, so that the resulting coated paper has excellent performance, meets the comprehensive performance requirements of high-rate and high-cycle life batteries for carrier materials, and has broad industrial application prospects.

[0033] Example 1 This embodiment provides a functional enhanced battery coated paper and a preparation method thereof, comprising the following steps: S100, dissolving a chitosan-modified surfactant in deionized water, adding sodium lauryl sulfate, and ultrasonically treating the mixture at 25° C. and 300 W to prepare a surfactant solution with a concentration of 0.5 wt.%; S200, adding carbon nanotubes and graphene oxide in a mass ratio of 1:3 to a surfactant solution, and performing a dispersion treatment at 300W for 25 minutes to obtain a conductive coating, wherein the total content of carbon nanotubes and graphene oxide is 10wt.%; S300, apply the conductive coating on the surface of the cellulose substrate in an amount of 25g / m 2 The coated paper was subjected to coating treatment and cross-linking and curing treatment for 8 minutes using 0.6 wt.% of the solid phase component at 100°C and 0.2 MPa. The coated paper surface was washed with deionized water, and the surface pH was adjusted to 7. The paper was dried with hot air at 70°C for 45 minutes. The paper was then soft-calendered twice at 90°C and a line pressure of 80 kN / m to obtain the coated paper.

[0034] Example 2 This embodiment provides a functional enhanced battery coated paper and a preparation method thereof, comprising the following steps: S100, dissolving a chitosan-based modifier in deionized water, adding polyethylene glycol, and ultrasonically treating the mixture at 20° C. and 400 W to prepare a surfactant solution with a concentration of 0.1 wt.%; S200, adding carbon nanotubes and graphene oxide in a mass ratio of 1:1 to a surfactant solution, and performing a dispersion treatment at 400W for 20 minutes to obtain a conductive coating, wherein the total content of carbon nanotubes and graphene oxide is 15wt.%; S300, apply the conductive coating on the surface of the cellulose substrate in an amount of 20 g / m 2 The coated paper was subjected to coating treatment and cross-linking and curing treatment at 80°C and 0.3 MPa for 10 minutes using 0.2 wt.% of the solid phase component. The coated paper surface was washed with deionized water, and the surface pH was adjusted to 6.5. The paper was dried with hot air at 60°C for 60 minutes. The paper was then soft-calendered three times at 80°C and a line pressure of 100 kN / m to obtain the coated paper.

[0035] Example 3 This embodiment provides a functional enhanced battery coated paper and a preparation method thereof, comprising the following steps: S100, dissolving polypyrrole-polyethylene glycol in deionized water, adding polyethylene glycol, and ultrasonically treating at 30° C. and 200 W to prepare a surfactant solution with a concentration of 0.1 wt.%; S200, adding carbon nanotubes and graphene oxide in a mass ratio of 1:4 to a surfactant solution, and performing a dispersion treatment at 200W for 30 minutes to obtain a conductive coating, wherein the total content of carbon nanotubes and graphene oxide is 5wt.%; S300, apply the conductive coating on the surface of the cellulose substrate in an amount of 30 g / m 2 The coated paper was subjected to coating treatment and cross-linking and curing treatment at 120°C and 0.1 MPa for 5 minutes using 1.0 wt.% of the solid phase component. The coated paper surface was washed with deionized water, and the surface pH was adjusted to 7.5. The paper was dried with hot air at 80°C for 30 minutes. A soft calendering post-treatment was performed at 80°C and a line pressure of 60 kN / m to obtain the coated paper.

[0036] Comparative Example 1 This comparative example provides a functional enhanced battery coated paper, which is purchased from outside.

[0037] Test data The conductive coatings of Examples 1-3 were tested for viscosity and solid content, and the test results are shown in Table 1. Examples 1-3 and Comparative Example 1 were quantitatively tested for thickness, smoothness, whiteness, air permeability, wear resistance, and tensile strength, and the results are shown in Table 2. Viscosity: measured at 25°C using a rotational viscometer according to GB / T 2794-2013. Solid content: According to GB / T 1725-2007, 2 g of the conductive coatings of Examples 1-3 were dried in an oven at 105°C to constant weight, and the mass loss rate was calculated. Dispersion stability: Evaluate the sedimentation rate after standing for 24 hours. Take 10mL of conductive coating and place it in a graduated test tube. Calculate the percentage of the bottom sediment volume to the total volume.

[0038] Table 1 Basis weight: According to GB / T 451.2-2002 “Paper and board - Determination of basis weight”; Thickness: According to GB / T 451.3-2002 "Paper and paperboard - Determination of thickness" (pressure 20kPa); Smoothness: According to GB / T 456-2002 "Paper and paperboard - Determination of smoothness (Buick method)" Whiteness: According to GB / T 7974-2013 “Paper, board and pulp - Determination of brightness (whiteness)”; Air permeability: According to GB / T 458-2008 "Paper and board - Determination of air permeability (Gurley method)" (unit: μm / (Pa·s); Conductivity: According to GB / T 3048.3-2007 "Electrical properties of wires and cables - Test methods - Surface resistivity" (four-probe method, 23±1°C); Abrasion resistance: According to GB / T 2679.6-2020 “Determination of abrasion resistance of paper and paperboard” (Taber method, 500g / 100 revolutions weight loss, unit: mg); Tensile strength: According to GB / T 12914-2018 "Paper and board - Determination of tensile strength" (constant rate of tension method, sample width 15 mm); Cycle life: Capacity retention after 500 charge and discharge cycles at 0.5C for a lead-acid battery (positive electrode: PbO2; negative electrode: Pb-coated paper) in accordance with GB / T 5008.1-2013. Adhesion: Based on ASTM D3359-2023 "Standard Test Method for Adhesion of Coatings by Tape Method" (0-5 levels, 5 means no peeling).

[0039] Table 2 The surface resistivity of Examples 1-3 was over 92% lower than that of Comparative Example 1, demonstrating the efficient charge transport capability of the three-dimensional interconnected network in the dispersed layer. The surfactant inhibited the aggregation of carbon nanotubes and graphene oxide, achieving uniform dispersion and dense bonding of the conductive filler. The bonding strength of Examples 1-2 reached the highest level of 5, while Example 3 achieved 4, significantly better than the 2 of Comparative Example 1, demonstrating that the dispersed layer enhances interfacial bonding through covalent crosslinking. The wear loss of Examples 1-3 was significantly lower than that of Comparative Example 1, demonstrating the coating's resistance to peeling. The tensile strength of Comparative Examples 1-3 was improved compared to Comparative Example 1, highlighting the synergistic enhancement effect of the cellulose matrix, dispersed layer, and conductive layer. The capacity retention of Examples 1-3 was improved compared to Comparative Example 1, indicating that the dispersed layer buffered volume expansion stress and had high air permeability, reducing the risk of pore deformation. The viscosity and solids content of the conductive coatings covered the industrial coating window, ensuring coating uniformity.

[0040] In general, the coated paper of this embodiment includes a base paper layer, a dispersion layer and a conductive layer stacked in sequence. The three-layer structure simultaneously overcomes the technical contradictions of conductivity, bonding strength and cycle stability through the triple synergy of surfactant dispersion, cross-linking reinforcement and network interpenetration, and meets the extreme performance requirements of high-rate batteries for coated paper.

[0041] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A functional enhanced battery coated paper, characterized in that: The coated paper comprises a base paper layer, a dispersion layer and a conductive layer stacked in sequence; Among them, the base paper layer includes a cellulose matrix; the dispersed layer includes a solid phase layer formed by a surfactant, and the surfactant includes at least one of a chitosan-modified surfactant, a chitosan-based modifier, polyethyleneimine, and polypyrrole-polyethylene glycol; the conductive layer includes a three-dimensional interconnected network structure formed by carbon nanotubes and graphene oxide in the dispersed layer.

2. The coated paper according to claim 1, characterized in that: In the dispersion layer, the surfactant has a mass concentration of 0.1-1.0 wt.% in the aqueous phase.

3. The coated paper according to claim 1, characterized in that: In the conductive layer, the total content of the carbon nanotubes and the graphene oxide is 5-15 wt.%, and the mass ratio of the carbon nanotubes to the graphene oxide is 1:(1-4).

4. A production process for functional enhanced battery coated paper, characterized in that: The production process is used to produce the functional enhanced battery coated paper according to any one of claims 1 to 3, and the production process comprises the following steps: S100, dissolving the surfactant in deionized water, adding a dispersant, and performing ultrasonic treatment to prepare a surfactant solution with a concentration of 0.1-1.0 wt.%; S200, adding the carbon nanotubes and the graphene oxide to the surfactant solution for dispersion treatment to obtain a conductive coating; S300, coating the conductive coating on the surface of the base paper layer, and sequentially performing cross-linking and curing treatment and post-treatment to obtain the coated paper.

5. The production process according to claim 4, characterized in that: In step S100, The temperature of the ultrasonic treatment is 20-30° C., and the power of the ultrasonic treatment is 200-400W; The dispersant comprises at least one of sodium lauryl sulfate and polyethylene glycol.

6. The production process according to claim 4, characterized in that: In step S200, the dispersion treatment time is 20-30 minutes, and the power is 200-400W.

7. The production process according to claim 4, characterized in that: In step S200 , the viscosity of the conductive coating is 200-500 mPa·s, and the solid content of the conductive coating is 12-20 wt.%.

8. The production process according to claim 4, characterized in that: In step S300, The coating amount of the coating process is 20-30g / m 2 ; The cross-linking and curing treatment is performed at a temperature of 80-120° C., a hot press of 0.1-0.3 MPa, and a time of 5-10 min.

9. The production process according to claim 4, characterized in that: In step S300, the crosslinking agent used in the crosslinking and curing treatment is at least one of glutaraldehyde and epichlorohydrin, and the amount of the crosslinking agent is 0.2-1.0 wt.% of the mass of the solid phase component.

10. The production process according to claim 4, characterized in that: In step S300, the post-processing includes cleaning, drying, and soft calendering; Wherein, the cleaning treatment cleans the coated paper surface with deionized water and adjusts the surface pH to 6.5-7.5; The drying process is performed by hot air drying at 60-80°C for 30-60 minutes; The soft calendering treatment is performed 1-3 times at 80-100° C. and a line pressure of 60-100 kN / m.

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