An oxychloride solid-state electrolyte slurry, a preparation method and application thereof

Abstract

The application relates to an oxychloride solid-state electrolyte slurry, which comprises: an oxychloride with a chemical formula of Li x MO y Cl z , wherein element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb and Ta, and 1<=x / y<=4 and 1<=z / y<=8 are met; a solvent, which is at least one of an ether solvent, a hydrocarbon solvent and a halogenated hydrocarbon solvent; a binder, which is a polymer; a dispersant, which is a substance containing a polar group, the polar group being a carboxyl group, an amide group or a carboxylate group, and at least one third of carbon atoms in the dispersant being distributed in the polar group; and a plasticizer, which is an ester substance. The oxychloride solid-state electrolyte slurry provided by the application has the advantages of stable oxychloride crystal structure, stable slurry state and stable solid-state electrolyte form.

Description

Technical Field

[0001] This application relates to solid electrolytes, and more particularly to halide solid electrolytes. Background Technology

[0002] Compared to traditional liquid lithium-ion batteries, solid-state batteries use more stable solid electrolytes that are less prone to leakage, significantly reducing the risk of fire and explosion when the battery is exposed to high temperatures or physical damage. Furthermore, because solid-state electrolytes can be used with lithium metal as the negative electrode material, they hold promise for significant breakthroughs in energy density, making them an inevitable trend in the development of lithium-ion power batteries. Currently, the mainstream solid-state electrolytes are polymers, oxides, and sulfides. Polymer solid-state electrolytes offer good flexibility and processability, but their ionic conductivity is not ideal. Oxide electrolytes have high ionic conductivity, but are rigid, have poor processability, and are not easy to achieve close contact with the positive and negative electrode interfaces. Sulfide electrolytes have high ionic conductivity and variability, but are sensitive to air, have poor chemical stability, and therefore require sophisticated manufacturing processes.

[0003] Halogenated electrolytes are halogen-containing electrolytes that, compared to currently mainstream solid electrolytes, possess considerable ionic conductivity, good deformability, and high chemical stability. Oxychloride electrolytes are one of the most researched and promising halide electrolytes for industrialization. The molding of oxychloride electrolytes requires the use of electrolyte slurries; however, existing solid electrolyte slurries primarily use water-based solvents, while oxychloride electrolytes have high solubility in water, which affects their crystal structure and thus their ionic conductivity. Currently, research on oxychloride electrolyte slurries is still in its early stages, and the appropriate additives for non-aqueous slurry formulations require further investigation. Summary of the Invention

[0004] This application provides a method for preparing and applying oxychloride solid electrolyte slurry to solve the technical problem of the lack of suitable electrolyte slurry systems for oxychloride electrolytes.

[0005] In a first aspect, embodiments of this application provide an oxychloride solid electrolyte slurry, the oxychloride solid electrolyte slurry comprising:

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

[0007] The solvent is a weakly polar or nonpolar solvent, and the solvent is at least one of ether solvents, hydrocarbon solvents, and halohydrocarbon solvents;

[0008] Adhesive, wherein the adhesive 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, wherein the plasticizer is an ester.

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

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

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

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

[0015] In some embodiments of this application, the oxychloride solid electrolyte slurry comprises, by weight parts: 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] Secondly, embodiments of this application provide 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 includes the following steps:

[0017] A first mixture containing the solvent and the binder is provided, wherein the binder is in a fully swollen state in the solvent;

[0018] A second mixture containing the solvent, the oxychloride, the dispersant, and the plasticizer is provided;

[0019] The first mixture and the second mixture are thoroughly mixed to obtain a third mixture;

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

[0021] In some embodiments of this application, before degassing the third mixture, the method for preparing the oxychloride solid electrolyte slurry further includes the following steps:

[0022] The third mixture is then milled.

[0023] Thirdly, embodiments of this application provide an electrolyte film, which is formed from the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or from the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

[0024] Fourthly, embodiments of this application provide a lithium battery separator, the lithium battery separator comprising:

[0025] Base film;

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

[0027] The technical solutions provided in this application have the following advantages compared with the prior art:

[0028] The oxychloride solid electrolyte slurry provided in this application uses weakly polar or non-polar ether solvents, hydrocarbon solvents, or halogenated hydrocarbon solvents as solvents to minimize the ionization of oxychloride. Then, a dispersant containing carboxyl, amide, or carboxylate groups is used to increase the dispersibility of oxychloride particles. A binder is used to increase the morphological stability of the solid electrolyte formed after solvent removal from the oxychloride solid electrolyte slurry. Simultaneously, the viscosity, ductility, and flowability of the oxychloride solid electrolyte slurry are adjusted by the combined use of binders and plasticizers. Ultimately, the oxychloride solid electrolyte slurry possesses the advantages of stable oxychloride crystal structure, stable slurry state, and stable solid electrolyte morphology. Attached Figure Description

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

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic flowchart illustrating a method for preparing an oxychloride solid electrolyte slurry, as provided in an embodiment of this application. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any conflict, this specification shall prevail.

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

[0035] The existing oxychloride electrolytes suffer from the technical problem of lacking a suitable electrolyte slurry system.

[0036] The technical solution provided in this application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0037] In a first aspect, embodiments of this application provide an oxychloride solid electrolyte slurry, the oxychloride solid electrolyte slurry comprising:

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

[0039] The solvent is a weakly polar or nonpolar solvent, and the solvent is at least one of ether solvents, hydrocarbon solvents, and halohydrocarbon solvents;

[0040] Adhesive, wherein the adhesive 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, wherein the plasticizer is an ester.

[0043] The solvent is selected as a weakly polar or non-polar solvent. The advantage of selecting at least one of ether solvents, hydrocarbon solvents, and halogenated hydrocarbon solvents is that the oxychloride is minimized from ionization. At the same time, the boiling point of non-polar solvents with similar relative molecular mass is usually lower than that of polar solvents, which makes it easier to remove the solvent during the preparation of oxychloride solid electrolyte from the oxychloride solid electrolyte slurry.

[0044] It is easy to understand that the binder can make the solid electrolyte formed after the solvent is removed from the oxychloride solid electrolyte slurry easier to mold, and make the morphology of the formed solid electrolyte more stable.

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

[0046] It is readily understood that the function of the dispersant is to adsorb onto the surface of oxychloride particles, increasing their dispersibility in the solvent while preventing their aggregation and sedimentation. The beneficial effect of using a substance containing polar groups as the dispersant is that carboxyl, amide, or carboxylic acid groups are relatively stably adsorbed onto the positively charged defects on the surface of the oxychloride particles, enhancing their dispersibility in the solvent. Simultaneously, the surface of the oxychloride particles is predominantly negatively charged, causing them to repel each other and thus preventing their aggregation and sedimentation.

[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, thereby adjusting the viscosity, extensibility and fluidity of the slurry. The beneficial effect of using ester substances as plasticizers is that the polar ester groups in the plasticizer molecules can interact with the polar groups of the binder molecules, thereby weakening the interaction forces between the binder macromolecules.

[0048] This application uses weakly polar or non-polar ether solvents, hydrocarbon solvents, or halogenated hydrocarbon solvents as solvents for the oxychloride solid electrolyte slurry to minimize the ionization of oxychloride. Then, it uses dispersants containing carboxyl, amide, or carboxylate groups to increase the dispersibility of oxychloride particles. Finally, it uses binders to increase the morphological stability of the solid electrolyte formed after solvent removal from the oxychloride solid electrolyte slurry. Simultaneously, binders and plasticizers are used to adjust the viscosity, ductility, and flowability of the oxychloride solid electrolyte slurry, ultimately obtaining an oxychloride solid electrolyte slurry with stable crystal structure, stable slurry state, and stable solid electrolyte morphology.

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

[0050] The advantage of using at least one of the following solvents—isopropyl ether, n-butyl ether, cyclopentyl methyl ether, anisole, petroleum ether, trichloroethylene, trifluoroacetic acid, carbon tetrachloride, and butyl chloride—is that all of these solvents have the characteristics of weak polarity and low boiling point, and are inexpensive and readily available.

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

[0052] The advantage of using at least one of polyvinylidene fluoride, polyacrylonitrile, polyimide, polyacrylic acid, and perfluorosulfonic acid resin as the adhesive is that the above polymer materials are easy to disperse well in solvents, have good bonding effects, and are inexpensive and readily available.

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

[0054] The advantage of using at least one of sodium citrate, sodium polyacrylate, polyacrylamide, and maleic acid-acrylic acid copolymer as the dispersant is that these substances are rich in carboxyl, carboxylate, or amino groups, which helps to increase the dispersibility of oxychloride particles in the solvent and prevent the agglomeration and sedimentation of oxychloride particles. At the same time, these substances are also inexpensive and readily available.

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

[0056] In some embodiments of this application, the oxychloride solid electrolyte slurry comprises, by weight parts: 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-mentioned formulation in the oxychloride solid electrolyte slurry is that it can not only make the oxychloride particles well dispersed in the oxychloride solid electrolyte slurry, but also make the oxychloride solid electrolyte slurry have a high concentration and viscosity, thus making it easy to form and the solvent can be removed quickly.

[0058] Secondly, embodiments of this application provide 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 includes the following steps:

[0059] S1: Provide a first mixture containing the solvent and the binder, wherein the binder is in a fully swollen state in the solvent;

[0060] S2: Provide a second mixture containing the solvent, the oxychloride, the dispersant, and the plasticizer;

[0061] S3: Thoroughly mix the first mixture and the second mixture to obtain a third mixture;

[0062] S4: Degas the third mixture to obtain the oxychloride solid electrolyte slurry.

[0063] It is easy to understand that adhesives need to be pre-mixed with solvent and fully swollen in order to fully exert their adhesive effect.

[0064] In some embodiments of this application, before degassing the third mixture, the method for preparing the oxychloride solid electrolyte slurry further includes the following steps:

[0065] S31: The third mixture is milled.

[0066] It is easy to understand that oxychloride can be pre-ground into oxychloride particles, or it can be prepared into a third mixture before grinding.

[0067] Thirdly, embodiments of this application provide an electrolyte film, which is formed from the oxychloride solid electrolyte slurry described in any embodiment of the first aspect, or from the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the second aspect.

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

[0069] Fourthly, embodiments of this application provide a lithium battery separator, the lithium battery separator comprising:

[0070] Base film;

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

[0072] The lithium battery separator is based on the oxychloride solid electrolyte slurry prepared by the preparation method described in any embodiment of the first aspect or the oxychloride solid electrolyte slurry prepared by any embodiment of the second aspect. The specific implementation of the lithium battery separator can be referred to the above embodiments and common knowledge in the art. Since the lithium battery separator adopts some 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.

[0073] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards. If there is no corresponding industry standard, then common international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0074] Example 1

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

[0076] 1.1g of polyacrylic acid was added to 30ml of carbon tetrachloride solvent and stirred for 4 hours to obtain the first mixture;

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

[0078] The first mixture is slowly added to the second mixture, and the mixture is stirred continuously for 10 hours to ensure uniform mixing, thus obtaining the third mixture.

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

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

[0081] The oxychloride solid electrolyte slurry was coated onto a polyethylene base film using a vacuum coating machine.

[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, thus obtaining the lithium battery separator.

[0083] The lithium battery separator was tested for ionic conductivity according to the national standard GB / T 36363-2018, and the ionic conductivity was found to be 0.9 mS / cm. This demonstrates that the oxychloride electrolyte coating effectively supports ionic conductivity.

[0084] Example 2

[0085] Add 6.3g of polyacrylic acid to 30ml of carbon tetrachloride solvent and stir for 10h to obtain the first mixture;

[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, and obtain a second mixture, wherein the chemical formula of the oxychloride is Li2ZrOCl4;

[0087] The first mixture was slowly added to the second mixture, and the mixture was stirred continuously for 5 hours to obtain the third mixture.

[0088] The third mixture was transferred to a sand mill and sand-milled for 30 minutes.

[0089] The third mixture after sand milling was degassed using a vacuum degassing machine to obtain the oxychloride solid electrolyte slurry. The operating parameters of the vacuum degassing machine were 1500 rpm for 30 min. The viscosity of the slurry at room temperature was measured to be approximately 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 strip with a thickness of about 25 μm using a small casting machine. After drying and peeling, the electrolyte film is obtained.

[0092] The lithium battery separator was tested for ionic conductivity according to the national standard GB / T 36363-2018, and the ionic conductivity was found to be 1.5 mS / cm. This demonstrates that the oxychloride electrolyte coating effectively supports ionic conductivity.

[0093] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has 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., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0094] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to." Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. For associations involving three or more related objects described using "and / or", it indicates that any one of the three related objects can exist alone, or at least two of them can exist simultaneously. For example, for A, and / or B, and / or C, it can mean that any one of A, B, and C exists alone, or any two of them exist simultaneously, or all three of them exist simultaneously. In this document, "at least one" means one or more, and "more than one" means two or more. "At least one", "at least one of the following", or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can each be single or multiple.

[0095] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed 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 The oxychloride, wherein element M is at least one of Sc, Y, Al, Ti, Zr, Hf, V, Nb, and Ta, and satisfies 1≤x / y≤4 and 1≤z / y≤8; The solvent is a weakly polar or nonpolar solvent, and the solvent is at least one of ether solvents, hydrocarbon solvents, and halohydrocarbon solvents; Adhesive, wherein the adhesive 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, wherein the plasticizer is an ester-based substance; The oxychloride solid electrolyte slurry comprises, by mass parts: 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, wherein the mass parts of plasticizer are not 0.

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

3. The oxychloride solid electrolyte slurry according to claim 1, characterized in that, The adhesive 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. 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 5, and the preparation method includes the following steps: A first mixture containing the solvent and the binder is provided, wherein the binder is in a fully swollen state in the solvent; A second mixture containing the solvent, the oxychloride, the dispersant, and the plasticizer is provided; The first mixture and the second mixture are thoroughly mixed to obtain a third mixture; The third mixture is subjected to degassing treatment to obtain the oxychloride solid electrolyte slurry.

7. The method for preparing oxychloride solid electrolyte slurry according to claim 6, characterized in that, Before degassing the third mixture, the method for preparing the oxychloride solid electrolyte slurry further includes the following steps: The third mixture is then milled.

8. An electrolyte film, characterized in that, The electrolyte film is formed from the oxychloride solid electrolyte slurry according to any one of claims 1 to 5, or from the oxychloride solid electrolyte slurry prepared by the preparation method according to claim 6 or 7.

9. A lithium battery separator, characterized in that, The lithium battery separator comprises: Base film; An electrolyte coating disposed on the surface of the base film is formed from the oxychloride solid electrolyte slurry according to any one of claims 1 to 5, or from the oxychloride solid electrolyte slurry prepared by the preparation method according to claim 6 or 7.

Images