Oxygen chloride solid electrolyte slurry and preparation method and application thereof

Abstract

The invention relates to oxychloride solid electrolyte slurry which comprises oxychloride with the chemical formula of LixMOyClz, an element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb and Ta, x / y is larger than or equal to 1 and smaller than or equal to 4, and z / y is larger than or equal to 1 and smaller than or equal to 8; the solvent is a weakly polar or non-polar solvent, and the solvent is at least one of an ether solvent, a hydrocarbon solvent and a halogenated hydrocarbon solvent; a binder, wherein the binder is a polymer; the dispersing agent is a substance containing a polar group, the polar group is carboxyl, acylamino or carboxylate radical, and at least one third of carbon atoms in the dispersing agent are distributed in the polar group; and the plasticizer is an ester substance. The oxychloride solid electrolyte slurry provided by the invention has the advantages that the oxychloride crystal structure is stable, the slurry state is stable, and the formed solid electrolyte form is stable.

Description

Technical Field

[0001] The present application relates to a solid electrolyte, and in particular to a halide solid electrolyte. Background Art

[0002] Compared with traditional liquid lithium-ion batteries, solid-state batteries use more stable and less prone to leakage solid electrolytes, which greatly reduces the risk of fire and explosion when the battery is exposed to high temperature or physical damage. At the same time, since solid electrolytes can be compatible with lithium metal as a negative electrode material, it is expected to achieve a great breakthrough in energy density, which is one of the inevitable trends in the development of lithium-ion power batteries. The current mainstream solid electrolytes are polymers, oxides, and sulfides. Among them, polymer solid electrolytes have good flexibility and processability, but the ionic conductivity is not ideal; oxide electrolytes have higher ionic conductivity, but strong rigidity, poor processability, and are not easy to be in close contact with the positive and negative electrode interfaces; sulfide electrolytes have higher ionic conductivity and variability, but are more sensitive to air, have weak chemical stability, and therefore have high requirements for the preparation process.

[0003] Halide electrolytes are electrolytes containing halogens. Compared with the current mainstream solid electrolytes, they have considerable ionic conductivity, good deformability, and high chemical stability. Oxychloride electrolytes are a type of halide electrolyte that has been studied a lot and is expected to be industrialized. The formation of oxychloride electrolytes needs to be achieved through electrolyte slurry. However, the existing solid electrolyte slurries mainly use water solvents, and the solubility of oxychloride electrolytes in water is relatively high, which will affect the crystal structure of the oxychloride electrolyte and thus affect the ionic conductivity. At present, the relevant research on oxychloride electrolyte slurry is still in its infancy, and what substances should be used for various additives in the slurry formula of non-aqueous systems also needs to be studied. Summary of the invention

[0004] The embodiments of the present application provide a method for preparing and applying an oxychloride solid electrolyte slurry to solve the technical problem that oxychloride electrolyte lacks a suitable electrolyte slurry system.

[0005] In a first aspect, an embodiment of the present application provides an oxychloride solid electrolyte slurry, wherein the oxychloride solid electrolyte slurry comprises:

[0006] The chemical formula is Li x MO y Cl z Oxychloride, wherein the element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb, Ta, and satisfies 1≤x / y≤4, 1≤z / y≤8;

[0007] A solvent, wherein the solvent is a weakly polar or non-polar solvent, and the solvent is at least one of an ether solvent, a hydrocarbon solvent, and a halogenated hydrocarbon solvent;

[0008] A binder, wherein the binder is a polymer;

[0009] A dispersant, wherein the dispersant is a substance containing a polar group, wherein the polar group is a carboxyl group, an amide group or a carboxylate group, and at least one third of the carbon atoms in the dispersant are distributed in the polar group;

[0010] Plasticizer, the plasticizer is an ester substance.

[0011] In some embodiments of the present application, the solvent is at least one of isopropyl ether, n-butyl ether, cyclopentyl methyl ether, anisole, petroleum ether, trichloroethylene, trifluoroacetic acid, carbon tetrachloride, and butyl chloride.

[0012] In some embodiments of the present application, the binder is at least one of polyvinylidene fluoride, polyacrylonitrile, polyimide, polyacrylic acid, and perfluorosulfonic acid resin.

[0013] In some embodiments of the present application, the dispersant is at least one of sodium citrate, sodium polyacrylate, polyacrylamide, and maleic acid-acrylic acid copolymer.

[0014] In some embodiments of the present application, the plasticizer is at least one of phthalates, fatty acid methyl esters, and citrates.

[0015] In some embodiments of the present application, the oxychloride solid electrolyte slurry includes, by weight: 95-105 parts of oxychloride, 80-100 parts of solvent, 5-20 parts of binder, 0.5-5 parts of dispersant, and 0-0.5 parts of plasticizer.

[0016] In a second aspect, an embodiment of the present application provides a method for preparing an oxychloride solid electrolyte slurry, wherein the oxychloride solid electrolyte slurry is the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, and the preparation method comprises the following steps:

[0017] Providing a first mixed solution containing the solvent and the binder, wherein the binder is in a completely swollen state in the solvent;

[0018] Providing a second mixed solution containing the solvent, the oxychloride, the dispersant, and the plasticizer;

[0019] Fully mixing the first mixed solution and the second mixed solution to obtain a third mixed solution;

[0020] The third mixed solution is subjected to a degassing treatment to obtain the oxychloride solid electrolyte slurry.

[0021] In some embodiments of the present application, before the third mixed solution is degassed, the method for preparing the oxychloride solid electrolyte slurry further includes the following steps:

[0022] The third mixed liquid is sand-milled.

[0023] In a third aspect, an embodiment of the present application provides an electrolyte film, which is formed by the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

[0024] In a fourth aspect, an embodiment of the present application provides a lithium battery separator, the lithium battery separator comprising:

[0025] Basement membrane;

[0026] An electrolyte coating is arranged on the surface of the base film, and the electrolyte coating is formed by the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

[0027] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0028] The oxychloride solid electrolyte slurry provided in the embodiment of the present application uses a weakly polar or non-polar ether solvent, hydrocarbon solvent, or halogenated hydrocarbon solvent as the solvent of the oxychloride solid electrolyte slurry to prevent the oxychloride from being ionized as much as possible, and then uses a dispersant containing a carboxyl group, an amide group, or a carboxylate group to increase the dispersibility of the oxychloride particles, and then uses a binder to increase the morphological stability of the solid electrolyte formed after the solvent is removed from the oxychloride solid electrolyte slurry. At the same time, the viscosity, ductility, and fluidity of the oxychloride solid electrolyte slurry are jointly adjusted by the binder and the plasticizer, so that the oxychloride solid electrolyte slurry finally has the advantages of a stable oxychloride crystal structure, a stable slurry state, and a stable morphology of the formed solid electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 A schematic flow chart of a method for preparing an oxychloride solid electrolyte slurry provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] Unless otherwise specified, the terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. In the event of a conflict, this specification takes precedence.

[0034] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0035] Existing oxychloride electrolytes have the technical problem of lacking a suitable electrolyte slurry system.

[0036] The technical solution provided by the embodiments of the present application is to solve the above technical problems, and the overall idea is as follows:

[0037] In a first aspect, an embodiment of the present application provides an oxychloride solid electrolyte slurry, wherein the oxychloride solid electrolyte slurry comprises:

[0038] The chemical formula is Li x MO y Cl z Oxychloride, wherein the element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb, Ta, and satisfies 1≤x / y≤4, 1≤z / y≤8;

[0039] A solvent, wherein the solvent is a weakly polar or non-polar solvent, and the solvent is at least one of an ether solvent, a hydrocarbon solvent, and a halogenated hydrocarbon solvent;

[0040] A binder, wherein the binder is a polymer;

[0041] A dispersant, wherein the dispersant is a substance containing a polar group, wherein the polar group is a carboxyl group, an amide group or a carboxylate group, and at least one third of the carbon atoms in the dispersant are distributed in the polar group;

[0042] Plasticizer, the plasticizer is an ester substance.

[0043] The solvent is a weakly polar or non-polar solvent, and the beneficial effect of selecting at least one of an ether solvent, a hydrocarbon solvent, and a halogenated hydrocarbon solvent is that the oxychloride is prevented from being ionized as much as possible. At the same time, the boiling point of a non-polar solvent with a similar relative molecular mass is usually lower than that of a polar solvent, which makes it easier to remove the solvent during the preparation of the oxychloride solid electrolyte by the oxychloride solid electrolyte slurry.

[0044] It is easy to understand that the binder can make the solid electrolyte formed after the oxychloride solid electrolyte slurry is desolventized easier to shape and make the morphology of the formed solid electrolyte more stable.

[0045] It is easy to understand that the oxychloride exists in the oxychloride solid electrolyte slurry in the form of particles, and the role of the binder is to enhance the bonding force between the oxychloride particles after the slurry is coated.

[0046] It is easy to understand that the function of the dispersant is to adsorb on the surface of the oxychloride particles, increase the dispersibility of the oxychloride particles in the solvent, and prevent the oxychloride particles from agglomerating and settling. The beneficial effect of using the substance containing polar groups as the dispersant is that the carboxyl group, amide group or carboxylate group is relatively stably adsorbed to the positively charged defects on the surface of the oxychloride particles, thereby enhancing the dispersibility of the oxychloride particles in the solvent, and making the surface of the oxychloride particles mainly negatively charged, thereby causing the oxychloride particles to repel each other and preventing the oxychloride particles from agglomerating and settling.

[0047] It is easy to understand that the function of the plasticizer is to distribute between the long-chain polymers in the binder, weaken the secondary bonds between molecules, increase the mobility and plasticity of the binder molecules, and thus adjust the viscosity, ductility and fluidity of the slurry. The beneficial effect of using ester substances as the plasticizer is that the polar ester groups in the plasticizer molecules can interact with the polar groups of the binder molecules, thereby weakening the forces between the binder macromolecules.

[0048] The present application uses weakly polar or non-polar ether solvents, hydrocarbon solvents, and halogenated hydrocarbon solvents as the solvent of the oxychloride solid electrolyte slurry to prevent the oxychloride from being ionized as much as possible, and then uses a dispersant containing a carboxyl group, an amide group, or a carboxylate group to increase the dispersibility of the oxychloride particles, and then uses a binder to increase the morphological stability of the solid electrolyte formed after the oxychloride solid electrolyte slurry removes the solvent. At the same time, the viscosity, ductility and fluidity of the oxychloride solid electrolyte slurry are jointly adjusted by the binder and the plasticizer, and finally an oxychloride solid electrolyte slurry with a stable crystal structure, a stable slurry state, and a stable solid electrolyte morphology is obtained.

[0049] In some embodiments of the present application, the solvent is at least one of isopropyl ether, n-butyl ether, cyclopentyl methyl ether, anisole, petroleum ether, trichloroethylene, trifluoroacetic acid, carbon tetrachloride, and butyl chloride.

[0050] The beneficial effect of selecting at least one of isopropyl ether, n-butyl ether, cyclopentyl methyl ether, anisole, petroleum ether, trichloroethylene, trifluoroacetic acid, carbon tetrachloride and butyl chloride as the solvent is that the above solvents all have the characteristics of weak polarity and low boiling point and are cheap and easily available.

[0051] In some embodiments of the present application, the binder is at least one of polyvinylidene fluoride, polyacrylonitrile, polyimide, polyacrylic acid, and perfluorosulfonic acid resin.

[0052] The beneficial effect of using at least one of polyvinylidene fluoride, polyacrylonitrile, polyimide, polyacrylic acid and perfluorosulfonic acid resin as the binder is that the above polymer materials are easily dispersed in the solvent, have good bonding effect and are cheap and easy to obtain.

[0053] In some embodiments of the present application, the dispersant is at least one of sodium citrate, sodium polyacrylate, polyacrylamide, and maleic acid-acrylic acid copolymer.

[0054] The beneficial effect of using at least one of sodium citrate, sodium polyacrylate, polyacrylamide, and maleic acid-acrylic acid copolymer as the dispersant is that the above substances all have abundant carboxyl groups, carboxyl groups, or amino groups, which are beneficial to increase the dispersibility of the oxychloride particles in the solvent and prevent the oxychloride particles from agglomerating and settling. At the same time, the above substances also have the advantages of being cheap and readily available.

[0055] In some embodiments of the present application, the plasticizer is at least one of phthalates, fatty acid methyl esters, and citrates.

[0056] In some embodiments of the present application, the oxychloride solid electrolyte slurry includes, by weight: 95-105 parts of oxychloride, 80-100 parts of solvent, 5-20 parts of binder, 0.5-5 parts of dispersant, and 0-0.5 parts of plasticizer.

[0057] The beneficial effect of using the above formula for the oxychloride solid electrolyte slurry is that the oxychloride particles can be well dispersed in the oxychloride solid electrolyte slurry, and the oxychloride solid electrolyte slurry has a higher concentration and viscosity, so that it is easy to shape and the solvent can be removed quickly.

[0058] In a second aspect, an embodiment of the present application provides a method for preparing an oxychloride solid electrolyte slurry, wherein the oxychloride solid electrolyte slurry is the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, and the preparation method comprises the following steps:

[0059] S1: providing a first mixed solution containing the solvent and the binder, wherein the binder is in a completely swollen state in the solvent;

[0060] S2: providing a second mixed solution containing the solvent, the oxychloride, the dispersant, and the plasticizer;

[0061] S3: fully mixing the first mixed liquid and the second mixed liquid to obtain a third mixed liquid;

[0062] S4: degassing the third mixed solution to obtain the oxychloride solid electrolyte slurry.

[0063] It is easy to understand that the adhesive needs to be pre-added with solvent and fully swelled to fully exert its bonding effect.

[0064] In some embodiments of the present application, before the third mixed solution is degassed, the method for preparing the oxychloride solid electrolyte slurry further includes the following steps:

[0065] S31: sand-milling the third mixed liquid.

[0066] It is easy to understand that the oxychloride can be ground into oxychloride particles in advance, or it can be ground after being prepared into the third mixed liquid.

[0067] In a third aspect, an embodiment of the present application provides an electrolyte film, which is formed by the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

[0068] The electrolyte membrane is realized based on the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect. The specific implementation of the electrolyte membrane can refer to the above embodiments and common knowledge in the field. Since the electrolyte membrane adopts part or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0069] In a fourth aspect, an embodiment of the present application provides a lithium battery separator, the lithium battery separator comprising:

[0070] Basement membrane;

[0071] An electrolyte coating is arranged on the surface of the base film, and the electrolyte coating is formed by the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

[0072] The lithium battery separator is realized based on the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect. The specific implementation of the lithium battery separator can refer to the above embodiments and common knowledge in the field. Since the lithium battery separator adopts part or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0073] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to industry standards. If there is no corresponding industry standard, then the conditions recommended by the manufacturer are followed.

[0074] Example 1

[0075] This embodiment provides an oxychloride solid electrolyte slurry, which is prepared by the following steps:

[0076] 1.1 g of polyacrylic acid was added into 30 ml of carbon tetrachloride solvent and stirred for 4 h to obtain a first mixed solution;

[0077] Take 10g of oxychloride and add it to 30ml of carbon tetrachloride solvent, stir for 30min, then add 0.11g of polyacrylamide, continue stirring for 3h to mix evenly, to obtain a second mixed solution, wherein the chemical formula of the oxychloride is Li2HfOCl4;

[0078] Slowly add the first mixed solution into the second mixed solution, and continue stirring for 10 hours to make the mixture uniform, to obtain a third mixed solution;

[0079] The third mixed solution is transferred to a degassing machine for degassing to obtain the oxychloride solid electrolyte slurry, wherein the operating parameters of the vacuum degassing machine are 1500 rpm, 20 min.

[0080] This embodiment also provides a lithium battery separator, which is prepared by the following steps:

[0081] Using a vacuum coater to coat the oxychloride solid electrolyte slurry on a base film made of polyethylene;

[0082] The coated base film is dried at 80° C. for 10 hours to form an oxychloride electrolyte coating on the surface of the base film to obtain the lithium battery separator.

[0083] The ionic conductivity of the lithium battery separator was tested according to the national standard GB / T 36363-2018, and the ionic conductivity was 0.9 mS / cm. It can be seen that the oxychloride electrolyte coating can effectively support ionic conduction.

[0084] Example 2

[0085] 6.3 g of polyacrylic acid was added into 30 ml of carbon tetrachloride solvent and stirred for 10 h to obtain a first mixed solution;

[0086] Take 50g of oxychloride, add it to 50ml of carbon tetrachloride solvent, stir for 30min, then add 0.9g of sodium polyacrylate and 0.08g of citrate in sequence, continue stirring for 3h to mix evenly, to obtain a second mixed solution, wherein the chemical formula of the oxychloride is Li2ZrOCl4;

[0087] Slowly add the first mixed solution into the second mixed solution and continue stirring for 5 hours to obtain a third mixed solution;

[0088] Transfer the third mixed solution to a sand mill and sand grind for 30 minutes;

[0089] The sand-milled third mixed solution was degassed by a vacuum degasser to obtain the oxychloride solid electrolyte slurry, wherein the operating parameters of the vacuum degasser were 1500 rpm, 30 min. The viscosity of the slurry at room temperature was measured to be about 2.3 Pa·s.

[0090] This embodiment also provides an electrolyte film, which is prepared by the following steps:

[0091] The slurry is cast into a material strip with a thickness of about 25 μm using a small casting machine, and the electrolyte film is obtained after drying and peeling.

[0092] The ionic conductivity of the lithium battery separator was tested according to the national standard GB / T 36363-2018, and the ionic conductivity was 1.5 mS / cm. It can be seen that the oxychloride electrolyte coating can effectively support ionic conduction.

[0093] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0094] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present application specification, the terms "including", "comprising", etc. refer to "including but not limited to". Moreover, the terms "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "including..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. For the association relationship of more than three associated objects described by "and / or", it means that any one of these three associated objects can exist alone, or any at least two of them exist at the same time. For example, for A, and / or B, and / or C, it can be represented that any one of A, B, and C exists alone, or any two of them exist at the same time, or three of them exist at the same time. In this article, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one", "the following at least one (individual)" or similar expressions refer to any combination of these items, including any combination of single (individual) or plural (individual). For example, "at least one (individual) of a, b, or c", or "at least one (individual) of a, b, and c", can all represent: a, b, c, ab (i.e. a and b), ac, bc, or abc, wherein a, b, and c can be single or multiple, respectively.

[0095] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An oxychloride solid electrolyte slurry, characterized in that: The oxychloride solid electrolyte slurry comprises: The chemical formula is Li x MO y Cl z Oxychloride, wherein the element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb, Ta, and satisfies 1≤x / y≤4, 1≤z / y≤8; A solvent, wherein the solvent is a weakly polar or non-polar solvent, and the solvent is at least one of an ether solvent, a hydrocarbon solvent, and a halogenated hydrocarbon solvent; A binder, wherein the binder is a polymer; A dispersant, wherein the dispersant is a substance containing a polar group, wherein the polar group is a carboxyl group, an amide group or a carboxylate group, and at least one third of the carbon atoms in the dispersant are distributed in the polar group; Plasticizer, the plasticizer is an ester substance.

2. The oxychloride solid electrolyte slurry according to claim 1, characterized in that: The solvent is at least one of isopropyl ether, n-butyl ether, cyclopentyl methyl ether, anisole, petroleum ether, trichloroethylene, trifluoroacetic acid, carbon tetrachloride and butyl chloride.

3. The oxychloride solid electrolyte slurry according to claim 1, characterized in that: The binder is at least one of polyvinylidene fluoride, polyacrylonitrile, polyimide, polyacrylic acid, and perfluorosulfonic acid resin.

4. The oxychloride solid electrolyte slurry according to claim 1, characterized in that: The dispersant is at least one of sodium citrate, sodium polyacrylate, polyacrylamide, and maleic acid-acrylic acid copolymer.

5. The oxychloride solid electrolyte slurry according to claim 1, characterized in that: The plasticizer is at least one of phthalate, fatty acid methyl ester and citrate.

6. The oxychloride solid electrolyte slurry according to claim 1, characterized in that: The oxychloride solid electrolyte slurry comprises, by weight: 95 to 105 parts of oxychloride, 80 to 100 parts of solvent, 5 to 20 parts of binder, 0.5 to 5 parts of dispersant, and 0 to 0.5 parts of plasticizer.

7. A method for preparing an oxychloride solid electrolyte slurry, characterized in that: The oxychloride solid electrolyte slurry is the oxychloride solid electrolyte slurry according to any one of claims 1 to 6, and the preparation method comprises the following steps: Providing a first mixed solution containing the solvent and the binder, wherein the binder is in a completely swollen state in the solvent; Providing a second mixed solution containing the solvent, the oxychloride, the dispersant, and the plasticizer; Fully mixing the first mixed solution and the second mixed solution to obtain a third mixed solution; The third mixed solution is subjected to a degassing treatment to obtain the oxychloride solid electrolyte slurry.

8. The method for preparing the oxychloride solid electrolyte slurry according to claim 7, characterized in that: Before the third mixed solution is subjected to a degassing treatment, the method for preparing the oxychloride solid electrolyte slurry further comprises the following steps: The third mixed liquid is sand-milled.

9. An electrolyte membrane, characterized in that: The electrolyte film is formed by the oxychloride solid electrolyte slurry according to any one of claims 1 to 6, or the oxychloride solid electrolyte slurry prepared by the preparation method according to claim 7 or 8.

10. A lithium battery separator, characterized in that: The lithium battery separator comprises: Basement membrane; The electrolyte coating is arranged on the surface of the base film, and the electrolyte coating is formed by the oxychloride solid electrolyte slurry described in any one of claims 1 to 6, or the oxychloride solid electrolyte slurry prepared by the preparation method described in claim 7 or 8.

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