Nanoslurry and its preparation method, battery separator and its manufacturing method, and battery

Abstract

The present invention provides a nanoslurry and a preparation method thereof, a battery separator and a manufacturing method thereof, and a battery, wherein the nanoslurry includes a dispersant, a ceramic material, a one-dimensional nanomaterial, a linear hydrophilic polymer, and an adhesive, and the mass ratio of the one-dimensional nanomaterial to the ceramic material is within the range of 0.01% to 20%, and the particle size of the ceramic material is within the range of 5 to 500 nm.

Description

[Technical Field]

[0001] The present invention relates to the field of batteries, and in particular to a nanoslurry and a method for preparing the same, a battery separator and a method for fabricating the same, and a battery. [Background technology]

[0002] lithium ion The battery separator is one of the important components of a lithium-ion battery, and its performance depends on the lithium ion This has a very important effect on the overall performance of the battery, and lithium ion It is one of the key technologies limiting the development of batteries. ion As the application fields of batteries continue to expand and the impact of lithium-ion electrical products on people's lives deepens, ion The demands on battery performance are also becoming increasingly high. ion To meet the requirements of battery development, the separator is ion As an important component of batteries, lithium ion batteries are not only chemically stable and inexpensive to manufacture, but also help improve the safety performance of lithium ion batteries. ion This is an important trend in battery development.

[0003] In the prior art, lithium ion The battery separator may include a base film and a coating covering at least one surface of the base film, and the coating slurry may be prepared based on ceramic particles. However, the surface of the ceramic particles may easily cause problems such as aggregation of the ceramic particles, resulting in poor uniformity of the coating surface, which may affect the subsequent bonding of the electrodes in the battery assembly. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a nano-slurry and a method for preparing the same, a battery separator and a method for fabricating the same, and a battery to solve the problem of agglomeration due to the surface of ceramic particles. [Means for solving the problem]

[0005] According to a first aspect, the present invention provides a separator comprising a dispersion medium, a ceramic material, a one-dimensional nanomaterial, a linear hydrophilic polymer, and an adhesive. Octopus The present invention provides a nanoslurry for coating, in which the mass ratio of the one-dimensional nanomaterial to the ceramic material is within the range of 0.01% to 20%, the content of water in the dispersion medium is 90 wt% or more, and the particle size of the ceramic material is within the range of 5 to 500 nm.

[0006] Optionally, the linear hydrophilic polymer is attached to the one-dimensional nanomaterial and linked to the ceramic material.

[0007] Optionally, the mass ratio of the linear hydrophilic polymer to water in the dispersion medium is within the interval of 0.01% to 0.1%.

[0008] Optionally, the molecular weight of the linear hydrophilic polymer is within the interval of 1000 g / mol to 10000 g / mol.

[0009] Optionally, the linear hydrophilic polymer comprises an amine hydrophilic polymer.

[0010] Optionally, the linear hydrophilic polymer is The polymer contains at least one of polyacrylamide and polyethyleneimine.

[0011] Optionally, the diameter of the one-dimensional nanomaterial is in the interval range of 1 to 50 nanometers, and the length of the one-dimensional nanomaterial is in the interval range of 100 to 1000 nanometers.

[0012] Optionally, the mass ratio of the adhesive to the ceramic material is in the interval range of 1% to 10%.

[0013] Optionally, the adhesive is The adhesive layer includes at least one of polyvinyl alcohol, lithium polyacrylate, sodium carboxymethyl cellulose, and styrene butadiene rubber.

[0014] According to a second aspect, the present invention provides a method for preparing a nanoslurry according to the first aspect and its alternative solutions, said method comprising: A step of dispersing a ceramic material in a dispersion medium having a water content of 90 wt % or more to obtain a ceramic dispersion; Dispersing a one-dimensional nanomaterial in the ceramic dispersion to obtain a predetermined dispersion; adding a linear hydrophilic polymer to the predetermined dispersion to obtain a predetermined solution; and adding an adhesive to the predetermined solution to obtain a nanoslurry.

[0015] Optionally, after adding a linear hydrophilic polymer to the predetermined dispersion, the preparation method further comprises: The method further comprises the step of dispersing the predetermined dispersion to which the linear hydrophilic polymer has been added by homogenization at a predetermined pressure and / or stirring at a predetermined speed to attach the linear hydrophilic polymer to the one-dimensional nanomaterial.

[0016] According to a third aspect, the present invention provides a battery separator comprising a base film and a coating; the coating is formed by applying a predetermined nanoslurry to at least one surface of the base film; The predetermined nanoslurry is a nanoslurry according to the first aspect and its alternative solutions or a nanoslurry prepared by the preparation method according to the second aspect.

[0017] According to a fourth aspect, the present invention provides a battery separator, comprising a base film and a coating, wherein the coating comprises a ceramic material, a one-dimensional nanomaterial, and a linear hydrophilic polymer, wherein the mass ratio of the one-dimensional nanomaterial to the ceramic material is within the interval of 0.01% to 20%, the particle size of the ceramic material is within the interval of 5 to 500 nm, and the linear hydrophilic polymer of , the one-dimensional nanomaterial Attach it to Connect to the ceramic material.

[0018] According to a fifth aspect, the present invention provides a battery comprising a battery separator according to the third or fourth aspect. [Effects of the Invention]

[0019] In the nanoslurry and its preparation method, battery separator and its manufacturing method, and battery provided by the present invention, a one-dimensional nanomaterial is introduced into a ceramic material to reduce the surface energy of the ceramic material, thereby reducing the surface roughness of the formed coating. At the same time, a linear hydrophilic polymer is used to further reduce the surface roughness. The linear hydrophilic polymer acts as a bridge between the one-dimensional nanomaterial and the ceramic material, completely bonding the two and further reducing the tendency of the ceramic material to aggregate, further reducing the surface roughness of the formed coating. The introduction of the linear hydrophilic polymer also contributes to preventing sedimentation of the slurry and improving its stability.

[0020] Furthermore, based on research into the slurry state, it was discovered that the selection of the mass of the one-dimensional nanomaterial has a certain correlation with the final slurry state (e.g., viscosity). Therefore, the present invention creatively discovers and utilizes this finding, and selects the mass ratio of the one-dimensional nanomaterial to the ceramic material in the range of 0.01% to 20%, effectively ensuring that the slurry can be easily applied. [Brief explanation of the drawings]

[0021] In order to more clearly describe the embodiments of the present invention or the solutions of the prior art, the following will briefly describe the drawings that need to be used in the description of the embodiments or the prior art. Of course, the drawings described below are only some embodiments of the present invention, and those skilled in the art can devise other drawings based on these drawings without any creative effort. [Figure 1] 1 is a flowchart of a method for preparing nanoslurry in one embodiment of the present invention. [Figure 2] 1 is a flow chart of a method for fabricating a battery separator in one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the technical solutions of the present invention will be described clearly and completely with reference to the drawings of the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments thereof, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are all within the protection scope of the present invention.

[0023] In the description of the present invention, the orientations or positional relationships indicated by terms such as "upper", "lower", "upper end", "lower end", "lower surface", and "upper surface" are orientations or positional relationships shown in the drawings, and are terms used only for the convenience and simplification of the description of the present invention. These terms do not indicate or imply that the devices or components shown necessarily have a specific orientation or are constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] In describing the present specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as terms that indicate or teach the relative importance or implicitly indicate the number of technical features shown. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of the feature.

[0025] In the description of the present invention, "plurality" means many, for example, two, three, four, etc., unless expressly limited otherwise.

[0026] In the description of the present invention, unless otherwise clearly defined and limited, the term "connected" and the like should be interpreted broadly, and may mean, for example, fixedly connected, detachably connected, or connected to form an integral unit, mechanically connected, electrically connected, or connected to be able to communicate with each other, directly connected, indirectly connected via an intermediate medium, or connected to establish communication between two components or an interactive relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the actual situation.

[0027] The technical solutions of the present invention will be described in detail below using specific examples. Some of the following specific examples can be combined with each other, and the same or similar concepts or processes may not be repeatedly described in some of the examples.

[0028] An embodiment of the present invention provides a separator comprising a dispersion medium, a ceramic material, a one-dimensional nanomaterial, a linear hydrophilic polymer, and an adhesive. Octopus A nanoslurry for coating is provided.

[0029] The dispersion medium may be any liquid that can be used to disperse materials, and the water content of the dispersion medium may be 90 wt% or more, and may further include dispersion mediums such as ethanol, acetone, and N-methylpyrrolidone.

[0030] That is, the water content may be 90 wt%, 92 wt%, 93 wt%, 95 wt%, 98 wt%, 99 wt%, or 100 wt%.

[0031] In some solutions, when the water content in the dispersion medium is not 100 wt%, it indicates that other solvents are introduced into the dispersion medium in addition to water. As a result, the surface tension of the mixed solvent can be significantly reduced due to the introduction of other solvents into the water. The reduction in surface tension contributes to further improving the uniformity of the dispersion of the ceramic material, one-dimensional nanomaterial, and linear hydrophilic polymer, thereby allowing the linear hydrophilic polymer to be more fully connected and contacted with the ceramic material and one-dimensional nanomaterial, thereby better solving the problem of ceramic particle aggregation.

[0032] The ceramic material includes at least one of alumina, silicon oxide, titanium oxide, magnesium hydroxide, boehmite, etc., where the particle size of the ceramic material (e.g., alumina) is within the range of 5 to 500 nm. When the particle size is within this range, the surface energy of the ceramic material is high, so it is very prone to aggregation, destabilizing the slurry. The embodiment of the present invention reduces the tendency for aggregation to occur under these conditions by introducing a one-dimensional nanomaterial and a linear hydrophilic polymer. In contrast, the ceramic material used in the related art is particle size Since the diameter of the nanoparticles is typically greater than 600 nm, the technical problem of agglomeration does not typically arise, and both the discovery and resolution of the agglomeration problem constitutes an improvement of an embodiment of the present invention.

[0033] The one-dimensional nanomaterials may be understood as nanowires, nanotubes, or nanorods, and may include, for example, at least one of nanocellulose, carbon nanotubes, aramid nanofibers, and polyimide nanofibers.

[0034] In other words, the present invention can reduce the surface roughness of the formed coating by introducing one-dimensional nanomaterials into a ceramic material and reducing the surface energy of the material.

[0035] The mass ratio of the one-dimensional nanomaterial to the ceramic material is within the range of 0.01% to 20%. For example, the mass ratio may be 0.01%, 0.05%, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%. The selected materials can be varied to select and vary the corresponding values ​​for different tests. In one example, the mass ratio of the one-dimensional nanomaterial to the ceramic material is within the range of 12% to 20%.

[0036] Furthermore, one-dimensional nanomaterials account for 1% to 20% of ceramic materials.

[0037] Based on research into the slurry state, it has been discovered that the selection of the mass of the one-dimensional nanomaterial has a certain correlation with the final slurry state (e.g., viscosity) (this correlation will be described later with reference to Table 1). Thus, the present invention creatively discovers and utilizes this finding, selecting the mass ratio of the one-dimensional nanomaterial to the ceramic material in the range of 0.01% to 20%, effectively ensuring that the slurry can be easily applied.

[0038] The diameter of the one-dimensional nanomaterial is in the interval range of 1 to 50 nanometers, and the length of the one-dimensional nanomaterial is in the interval range of 100 to 1000 nanometers.

[0039] The linear hydrophilic polymer acts as a bridge between the 1D nanomaterial and the ceramic material, completely bonding them together, significantly reducing the tendency of the ceramic material to aggregate and further reducing the surface roughness of the resulting coating. Furthermore, the addition of the linear hydrophilic polymer also contributes to preventing slurry settling and improving the stability of the slurry. A comparison of specific performances is discussed later with reference to Table 1.

[0040] In a further example, the mass ratio of the linear hydrophilic polymer to water in the dispersion medium may be within the interval of 0.01% to 0.1%, such as 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%.

[0041] The molecular weight of the linear hydrophilic polymer may be in the range of 1000 g / mol to 10000 g / mol, for example, 1000 g / mol, 2000 g / mol, 3000 g / mol, 4000 g / mol, 5000 g / mol, 6000 g / mol, 7000 g / mol, 8000 g / mol, 9000 g / mol, or 10000 g / mol.

[0042] The linear hydrophilic polymer includes an amine hydrophilic polymer, and examples of the amine hydrophilic polymer include at least one of polyacrylamide and polyethyleneimine, but are not limited to these examples.

[0043] Regarding the use of amine hydrophilic polymers, the principle of their operation is as follows. Dangling bonds are formed due to defects on the surface of ceramic materials, but amines (-NH-) have lone electron pairs and easily bond with dangling bonds on the surface of ceramic materials, so they have a very good affinity with ceramic materials. This makes amine hydrophilic polymers Part of is ceramics materialThe other end of the amine hydrophilic polymer is a non-polar carbon-based molecular chain, which has poor compatibility with polar water, so ceramics containing the amine hydrophilic polymer material After the carbon-containing one-dimensional nanomaterials are introduced, the carbon-containing molecular chains on the amine hydrophilic polymer have a high affinity with the carbon-containing molecular chains on the one-dimensional nanomaterials, so the ceramic material The amine polymer-one-dimensional nanomaterial structure is formed, and the hydrophilic functional groups on the one-dimensional nanomaterial form a highly stable network structure in water, thereby significantly improving the stability of the structure in water. As a result, the amine hydrophilic polymer can act as a dispersant. In one embodiment, a linear hydrophilic polymer is attached to the one-dimensional nanomaterial.

[0044] Based on research into the slurry state, it was discovered that the linear hydrophilic polymer correlates with the state of the dispersion (this correlation will be described later with reference to Table 1). Thus, the present invention creatively discovers and utilizes this discovery by selecting the mass ratio of the linear hydrophilic polymer to water in the dispersion medium to be in the range of 0.01% to 0.1%, which can prevent the slurry from settling and ensure the stability of the slurry, while effectively reducing the aggregation of the ceramic material.

[0045] The adhesive may be any material capable of performing an adhesive function, including, for example, at least one of polyvinyl alcohol, lithium polyacrylate, sodium carboxymethyl cellulose, and styrene butadiene rubber.

[0046] Furthermore, the mass ratio of the adhesive to the ceramic material may be in the range of 1% to 10%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%.

[0047] In this regard, if there is too much adhesive (for example, if the mass ratio of adhesive to ceramic material is greater than 10%), SeparatorThe pores become clogged, which affects the lithium ion transport rate. Conversely, if the adhesive is too small (for example, if the mass ratio of the adhesive to the ceramic material is less than 1%), the ceramic material and the one-dimensional nanomaterial are easily peeled off from the separator. Therefore, selecting a range of 1% to 10% can effectively achieve both transport rate and adhesive performance. To obtain the above-mentioned nanoslurry, an embodiment of the present invention further provides a nanoslurry preparation method for preparing the above-mentioned nanoslurry. Referring to FIG. 1, the preparation method includes steps S11 to S14: In S11, a ceramic material is dispersed in a dispersion medium to obtain a ceramic dispersion liquid; In S12, a one-dimensional nanomaterial is dispersed in the ceramic dispersion to obtain a predetermined dispersion; In S13, a linear hydrophilic polymer is added to the predetermined dispersion, and the predetermined dispersion is Distributed and stabilized to obtain a predetermined solution, In S14, an adhesive is added to the predetermined solution to obtain a nanoslurry.

[0048] In a specific example of step S11, the ceramic material can be sufficiently dispersed in the dispersion medium, and the water content in the dispersion medium is 90 wt% or more. For example, at least one of high-speed stirring, high-pressure homogenization, and sand-polishing dispersion can be used as the dispersion method, and the ceramic material is uniformly dispersed in the dispersion medium to form a ceramic dispersion. In one example, the concentration of the ceramic material in the ceramic dispersion may be 0.01 to 50 wt%.

[0049] In a specific example of step S12, the one-dimensional nanomaterial is added to the ceramic dispersion, and then the one-dimensional nanomaterial is dispersed again using at least one method such as high-speed stirring, high-pressure homogenization, sand-grinding dispersion, etc., to thoroughly and uniformly mix the ceramic material with the one-dimensional nanomaterial. The dispersion method in step S11 may be the same as or different from the dispersion method in step S12.

[0050] In a specific example of step S13, after adding the linear hydrophilic polymer, homogenization and Place Stirring at a constant speed (e.g., 3k-50kr / min) At least one of The linear hydrophilic polymer can be attached to the one-dimensional nanomaterial by dispersing a predetermined dispersion liquid to which the linear hydrophilic polymer has been added.

[0051] The adhesion is based on the ability of the linear hydrophilic polymer itself to complete the adhesion during dispersion.

[0052] In some cases, due to the large surface energy, particles of ceramic materials and one-dimensional nanomaterials in the dispersion exist as aggregates, making it difficult for ordinary polymers to penetrate into these aggregates. The linear hydrophilic polymer selected in this invention has linear characteristics and low resistance to penetrating into the aggregates. Meanwhile, when an amide material is selected as the linear hydrophilic polymer, amides have strong polarity and excellent compatibility in water. Therefore, the linear hydrophilic polymer easily penetrates into the aggregates together with water, and through polar interactions, tightly coats the nanomaterial surface. When a strong external force (high pressure, high-speed stirring, etc.) is applied, the aggregates are broken down and the nanomaterial is stably dispersed in water.

[0053] In the specific example of step S14, an adhesive may be added to the predetermined solution obtained after step S13, and in some cases, an auxiliary agent may be added thereafter. To facilitate the explanation of the role of the various features in the above specific example, the following data obtained by testing is described.

[0054] [Table 1-1] [Table 1-2]

[0055] As is clear from Comparative Examples 2 and 3, when no linear hydrophilic polymer was added, the slurry could not exist stably, and the surface roughness of the separator after coating was 1000 nm or more. This roughness far exceeded the roughness of the base film (450 nm), but it was still smaller than the case where no linear hydrophilic polymer or one-dimensional nanomaterial was added at all (Comparative Example 1). is In this case, the surface roughness of the separator reached 400 nm. As is clear from comparison with Examples 1 and 3 to 5, this indicates a correlation between the addition of a linear hydrophilic polymer and the roughness, and adding an appropriate amount of a linear hydrophilic polymer can contribute to reducing the roughness.

[0056] A comparison of Example 1 and Comparative Example 5 reveals that when nanocellulose is not added, the slurry tends to settle, and the surface roughness of the coated separator is as high as 1200 nm. A comparison of Example 1 and Comparative Example 4 reveals that when the nanocellulose content is too high (25%), the viscosity of the slurry becomes too high to coat. In light of this, the examples of the present invention set the mass ratio of the one-dimensional nanomaterial to the ceramic material to 0.01% to 20%.

[0057] Other one-dimensional nanomaterials and linear hydrophilic polymers have similar functions, namely reducing surface roughness (Examples 3, 4, and 5), when kept within the appropriate range.

[0058] The main cause of the roughness problem is that when the ceramic material is small (particle size 5-500 nm), its surface energy becomes very high, which makes it prone to aggregation, destabilizing the slurry and dramatically increasing the surface roughness of the coated separator. Adding a hydrophilic polymer can reduce the surface energy. By bonding the hydrophilic polymer to the ceramic material's surface, it enhances its affinity for water, thereby reducing the surface energy. As shown in Comparative Examples 5 and 6, when the mass ratio of linear hydrophilic polymer to water was set to 0.01-0.1%, the separator's surface roughness was better than that of Comparative Example 1. However, because no one-dimensional nanomaterials were added, the stability was still poor and the roughness was still high.

[0059] Comparing Example 1 with Example 6, Example 5 with Example 7, and Example 3 with Example 8, it is clear that when the water content in the dispersion medium is not 100 wt%, other solvents are introduced into the water, which effectively reduces the surface roughness of the separator. This is because the surface tension of the mixed solvent (i.e., the dispersion medium) is significantly reduced due to the introduction of other solvents. After the one-dimensional nanomaterial, ceramic material, and linear hydrophilic polymer are added, the dispersion uniformity of the ceramic material, one-dimensional nanomaterial, and linear hydrophilic polymer can be further improved, which better solves the problem of ceramic particle aggregation and further reduces the surface roughness of the coating.

[0060] In addition, in the implementation process of the above examples and comparative examples, a PE base film with a thickness of 11 μm, a pore diameter of 40 nm, and a porosity of 42% is selected as the base film used, and therefore the above technical effects realized by the above examples and comparative examples are realized by applying the same (or similar) base film.

[0061] Corresponding to the nanoslurry and its preparation method described above, an embodiment of the present invention provides a battery separator including a base film and a coating, the coating is formed by applying a predetermined nanoslurry to at least one surface of the base film; The predetermined nanoslurry is Octopus Alternatively, the predetermined nanoslurry is a nanoslurry prepared by the above-mentioned method for preparing a nanoslurry.

[0062] Further, an embodiment of the present invention provides a battery separator comprising a base film and a coating, wherein the coating comprises a ceramic material, a one-dimensional nanomaterial, and a linear hydrophilic polymer, the mass ratio of the one-dimensional nanomaterial to the ceramic material being within the range of 0.01% to 20%, the particle size of the ceramic material being within the range of 5 to 500 nm, and the linear hydrophilic polymer being attached to the one-dimensional nanomaterial and connected to the ceramic material.

[0063] Any technical terms, technical means, technical effects and optional embodiments of the present invention can be understood with reference to the relevant descriptions in the preceding paragraphs.

[0064] Based on the above battery separator, referring to FIG. 2, an embodiment of the present invention further provides a method for manufacturing a battery separator, the method including steps S21 to S22: In S21, the nanoslurry is applied to a base film to form a coating on the base film; In S22, the base film with the coating is dried to obtain a battery separator.

[0065] In a specific example of step S21, the slurry is applied to a base film by at least one method such as microgravure roll coating, spray coating, dip coating, extrusion coating, etc., and then dried to obtain a ceramic material composite battery separator. The application may be single-sided or double-sided, thereby forming a coating on one or both sides.

[0066] An embodiment of the present invention further provides a battery comprising a battery separator according to the above alternative solution.

[0067] In the description herein, the use of terms such as "one embodiment," "one example," "specific implementation process," "one example," and the like means that the specific features, structures, materials, or characteristics described with reference to the example or example are included in at least one example or example of the present invention. In the description herein, general expressions of the above terms do not necessarily refer to the same example or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in any one or more examples or examples.

[0068] Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention, but are not intended to limit the same. The present invention will be described in detail with reference to the above embodiments. However, those skilled in the art may still modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features thereof, and it should be understood that these modifications or substitutions will not deviate from the essence of the corresponding technical solutions and the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nanoslurry for separator coating, comprising a dispersion medium, a ceramic material, a one-dimensional nanomaterial, a linear hydrophilic polymer, and an adhesive, wherein the mass ratio of the one-dimensional nanomaterial to the ceramic material is within a range of 0.01% to 20%, the content of water in the dispersion medium is 90 wt % or more, and the particle size of the ceramic material is within a range of 5 to 500 nm; 10. A nanoslurry for separator coating, wherein the linear hydrophilic polymer is an amine hydrophilic polymer.

2. The nanoslurry described in claim 1, characterized in that the surface of the ceramic material has defect sites where dangling bonds are formed, the amine hydrophilic polymer bonds to the dangling bonds on the surface of the ceramic material, and the carbon-containing molecular chains on the amine hydrophilic polymer have an affinity with the one-dimensional nanomaterial, thereby forming a structure of ceramic material-amine polymer-one-dimensional nanomaterial.

3. The nanoslurry according to claim 1, characterized in that the mass ratio of the linear hydrophilic polymer to water in the dispersion medium is within the interval range of 0.01% to 0.1%.

4. The amine hydrophilic polymer is The nanoslurry of claim 1 , characterized in that the nanoslurry is at least one of polyacrylamide and polyethyleneimine.

5. 2. The nanoslurry of claim 1, wherein the diameter of the one-dimensional nanomaterial is in the interval range of 1 to 50 nanometers, and the length of the one-dimensional nanomaterial is in the interval range of 100 to 1000 nanometers.

6. The nanoslurry according to claim 1, wherein the mass ratio of the adhesive to the ceramic material is in the range of 1% to 10%.

7. The adhesive is 10. The nanoslurry of claim 1, comprising at least one of polyvinyl alcohol, lithium polyacrylate, sodium carboxymethyl cellulose, and styrene butadiene rubber.

8. 2. The nanoslurry according to claim 1, wherein a mass ratio of the ceramic material to the dispersion medium is 0.01 wt % to 50 wt %.

9. 10. A method for preparing the nanoslurry of claim 1, comprising: A step of dispersing a ceramic material in a dispersion medium having a water content of 90 wt % or more to obtain a ceramic dispersion; Dispersing a one-dimensional nanomaterial in the ceramic dispersion to obtain a dispersion; adding a linear hydrophilic polymer to the dispersion to obtain a solution; and adding an adhesive to the solution to obtain a nanoslurry.

10. After adding the linear hydrophilic polymer to the dispersion, the preparation method comprises: The preparation method of claim 9, further comprising the step of dispersing the dispersion to which the linear hydrophilic polymer has been added by at least one of homogenization at a predetermined pressure and stirring at a predetermined speed to attach the linear hydrophilic polymer to the one-dimensional nanomaterial.

11. a battery separator, the battery separator comprising a base film and a coating; the coating is formed by applying a nano-slurry to at least one surface of the base film; A battery separator, characterized in that the nanoslurry is the nanoslurry according to any one of claims 1 to 8 or the nanoslurry prepared by the preparation method according to claim 9.

12. 1. A battery separator comprising: a base film and a coating, the coating comprising a ceramic material, a one-dimensional nanomaterial, and a linear hydrophilic polymer, the mass ratio of the one-dimensional nanomaterial to the ceramic material being within a range of 0.01% to 20%, the particle size of the ceramic material being within a range of 5 to 500 nm, the linear hydrophilic polymer being an amine hydrophilic polymer, the ceramic material having defect sites at which dangling bonds are formed on the surface thereof, the amine hydrophilic polymer bonding to the dangling bonds on the surface of the ceramic material, and carbon-containing molecular chains on the amine hydrophilic polymer having an affinity for the one-dimensional nanomaterial, thereby forming a ceramic material-amine polymer-one-dimensional nanomaterial structure.

13. A battery comprising the battery separator of claim 11.

14. A battery comprising the battery separator of claim 12.

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