Solid electrolyte slurry and use thereof

Abstract

The invention provides solid electrolyte slurry and application thereof.The solid electrolyte slurry comprises a solid electrolyte, a rheological additive, a dispersing agent and a solvent, the solid electrolyte slurry is compounded by the dispersing agent and the rheological additive, the stability of the solid electrolyte slurry can be improved for a long time, sedimentation can be reduced, and the solid electrolyte slurry can be used for a long time. And the stability of the solid electrolyte particle size can be maintained, and the long-term particle size uniformity can be maintained.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a solid electrolyte slurry and its uses. Background Art

[0002] Solid oxide electrolytes are a new type of electrolyte material for energy storage devices. They have high ionic conductivity and excellent thermal stability, and can effectively improve the safety, stability, and long-life characteristics of energy storage devices. Currently, making solid electrolytes into slurries and preparing solid-state battery electrodes through methods such as coating or chemical vapor deposition, or directly introducing solid electrolytes into lithium batteries, can better improve processing flexibility and optimize battery performance. However, because the density of solid electrolytes is significantly greater than that of solvents, during the storage and transportation of solid electrolyte slurries, the problem of solid electrolyte sedimentation is extremely likely to occur, resulting in a large difference in the solid content between the upper and lower layers of the solid electrolyte slurry, and obvious agglomeration between solid electrolyte particles, thereby affecting the various performances of the battery.

[0003] Therefore, it is necessary to prepare a solid electrolyte slurry with stable solid content and particle size, which has good application value and broad market prospects. Summary of the Invention

[0004] In quasi-solid-state lithium-ion batteries, solid electrolyte slurries are commonly used as additives to improve the rate performance and safety performance of batteries. Traditional solid electrolytes are a suspension composed of electrolytes, solvents, and additives. After standing, sedimentation and stratification are likely to occur, and the solvent and electrolyte particles separate, making it impossible to store for a long time, and particle agglomeration is extremely likely to occur during storage, resulting in poor slurry performance. To address the above technical problems, the present application uses a method of compounding a dispersant and a rheological agent to prepare a slurry with stable solid content, solve the problems of stratification during slurry storage and inability to resist vibration during transportation, and can better inhibit particle agglomeration during storage, thus completing the present application.

[0005] The present application provides a solid electrolyte slurry, which comprises a solid electrolyte, a rheological aid, a dispersant, and a solvent.

[0006] Preferably, for the above-mentioned solid electrolyte slurry, the rheological aid is an organic compound containing active hydrogen atoms or an inorganic compound containing active hydrogen atoms.

[0007] For the above-mentioned solid electrolyte slurry, the organic compound is polyamide wax.

[0008] For the above-mentioned solid electrolyte slurry, the melting point of the polyamide wax is 120 - 170 °C, and / or,

[0009] The content of the amide group -CONH- in the polyamide wax is 5-50%, preferably 10-35%.

[0010] For the solid electrolyte slurry described above, the weight-average molecular weight of the polyamide wax is 200-10,000, preferably 500-3,000.

[0011] For the solid electrolyte slurry described above, the inorganic compound is fumed silica.

[0012] For the solid electrolyte slurry described above, the specific surface area of the fumed silica is 100-500 m 2 / g, preferably 150-400 m 2 / g; and / or the surface hydroxyl content of the fumed silica is 1.5-5.0%.

[0013] For the solid electrolyte slurry described above, the weight-average molecular weight of the dispersant is 2,000-1,500,000, preferably 30,000-250,000.

[0014] For the solid electrolyte slurry described above, the dispersant is polyethylene oxide, polypropylene oxide, ethylene oxide-propane copolymer, polyvinylpyrrolidone, or a derivative thereof.

[0015] For the solid electrolyte slurry described above, the solid content of the solid electrolyte slurry is 30-70%.

[0016] The mass ratio of the solid electrolyte, rheological aid, and dispersant is 100:0.5-5:0.3-5.

[0017] For the solid electrolyte slurry described in any one of the above, the solid electrolyte is selected from one or more of perovskite-type solid electrolytes, garnet-type solid electrolytes, sodium superionic conductor (NASICON)-type solid electrolytes, lithium superionic conductor (LiSICON)-type solid electrolytes, and phosphate-based solid electrolytes, preferably phosphate-based solid electrolytes.

[0018] For the solid electrolyte slurry described in any one of the above, the solvent is selected from one or more of N-methyl-2-pyrrolidone, acetonitrile, N,N-dimethylformamide, dimethylacetamide, and dimethyl carbonate, preferably N-methyl-2-pyrrolidone.

[0019] This application provides the use of the solid electrolyte slurry described in any one of the above in the field of batteries, preferably in the field of lithium-ion batteries or sodium-ion batteries.

[0020] The present application provides a battery, which comprises the solid electrolyte slurry described in any one of the above.

[0021] Optionally, the battery is a sodium ion battery or a lithium ion battery.

[0022] The solid electrolyte slurry described in the present application is compounded with a dispersant and a rheology aid, which can improve the stability of the solid electrolyte slurry for a long time, reduce sedimentation, and can maintain the stability of the particle size of the solid electrolyte to inhibit particle agglomeration and maintain long-term particle size uniformity. Detailed Embodiments

[0023] The present application will be described in detail below in conjunction with the described embodiments. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0024] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. The specification and claims of the present application do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of components as a criterion for distinction. As mentioned throughout the specification and claims, "comprising" or "including" is an open term and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment for implementing the present application, but the description is for the purpose of the general principles of the specification and is not intended to limit the scope of the present application. The protection scope of the present application shall be determined by the scope defined by the appended claims.

[0025] The present application provides a solid electrolyte slurry, which comprises a solid electrolyte, a rheology aid, a dispersant and a solvent.

[0026] In some embodiments, the rheology aid is an organic compound containing active hydrogen atoms or an inorganic compound containing active hydrogen atoms, the hydrogen atoms are linked to atoms with relatively strong electronegativity such as N and O, and strong hydrogen bond interactions can be formed between molecules. For example, the active hydrogen atoms can be derived from organic compounds containing -OH, -COOH, -CONH-, -NH2, etc., or from inorganic compounds containing inorganic groups such as Al-OH and Si-OH.

[0027] In some embodiments, the organic compound is polyamide wax. In some embodiments, the melting point of the polyamide wax is 120-170 °C, and / or the amide group content in the polyamide wax is 10%-50% of the total molecular weight.

[0028] The amide group content of the polyamide wax can be 10%, 15%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 31%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, etc., preferably 10%-35%. The content of active hydrogen is characterized by the amide group content. The active hydrogen in the polyamide wax mainly comes from -COOH, -NH2, -CONH-. -COOH and -NH2 are the remaining groups after the reaction of polyamine and polyacid. However, the acid value and amine value of the polyamide wax are both less than 3mgKOH / g, indicating that -COOH and -NH2 have basically reacted and the remaining amount is very small. The amide group is the main existence form of active hydrogen in the polyamide wax.

[0029] The melting point of the polyamide wax can be 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, etc.

[0030] In this application, there are no restrictions on the measurement methods of the melting point and amide group content. Those skilled in the art can use conventional methods in the art for measurement. The amide group content of this application is tested and characterized by infrared spectroscopy: the amide group (-CONH-) has characteristic absorption peaks in the infrared spectrum, usually located in the regions of about 1650 cm-1 (C=O stretching vibration) and 3300-3500 cm-1 (N-H stretching vibration). By comparing the peak area at 1650 cm-1 with the peak area at 1650 cm-1 of a polyamide wax sample with a known content, the proportion of the amide group in the sample can be confirmed.

[0031] In some embodiments, the weight average molecular weight of the polyamide wax is 200-10000, preferably 500-3000.

[0032] For example, the weight average molecular weight of the polyamide wax can be 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1200, 1500, 1800, 2000, 2200, 2500, 2800, 3000, etc. When the molecular weight of the polyamide wax is too low, the anti-settling property of the formed slurry is poor; when the molecular weight is too high, the particle size of the formed slurry is too large.

[0033] In this application, there are no restrictions on the measurement method of the weight average molecular weight of the polyamide wax. Those skilled in the art can measure it based on conventional methods in the art. For example, gel permeation chromatography (GPC) can be used for measurement.

[0034] In some embodiments, the inorganic compound is an inorganic oxide, which may be fumed silica. Preferably, the surface hydroxyl content of the fumed silica is 1.5-5.0%.

[0035] Fumed silica, also known as "fumed white carbon black", is actually amorphous particles with nanometer scale and covered with hydroxyl groups and adsorbed water on the surface, formed by silicon halides (such as monomethyltrichlorosilane, silicon tetrachloride or trichlorosilane) after high-temperature treatment with hydrogen-oxygen flame. This substance appears as a white flocculent powder at room temperature. It is a non-metallic oxide that is non-toxic, tasteless, odorless and does not pollute the environment. Fumed silica has many characteristics such as small particle size, large specific surface area, extremely high chemical purity and excellent dispersion performance.

[0036] In the present application, there is no limitation on the method for determining the surface hydroxyl groups of fumed silica. Those skilled in the art may use conventional methods in the art for determination. The present application uses the following method for determination: the silica sample is dried at a low temperature such as 105°C*2h to remove physically adsorbed water, and then the silanol content is tested by TGA. The temperature range of the TGA test is from room temperature to 1000°C, and the heating rate is 10°C / min (inert atmosphere, such as N2). The percentage of weight loss of the sample is calculated, and the percentage of silanol is calculated based on the ratio of two moles of silanol to one mole of water.

[0037] For example, the surface hydroxyl content of the fumed silica may be 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, 3%, 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.7%, 5%, etc.

[0038] In some embodiments, the specific surface area of ​​the fumed silica is 100-500 m 2 / g, preferably 150-400m 2 / g; For example, the specific surface area of ​​the fumed silica can be 100m 2 / g, 120m 2 / g, 150m 2 / g, 180m 2 / g, 200m 2 / g, 220m 2 / g, 250m 2 / g, 280m 2 / g、300m 2 / g, 320m 2 / g, 350m 2 / g, 380m 2 / g, 400m 2 / g, 420m2 / g, 450 m 2 / g, 480 m 2 / g, 500 m 2 / g, etc.

[0039] In this application, there is no limitation on the method for measuring the specific surface area of fumed silica, and it can be measured by conventional methods in the art, such as measured by the BET method using a specific surface area analyzer.

[0040] In some embodiments, the dispersant is polyethylene oxide, polypropylene oxide, ethylene oxide - propane copolymer, polyvinylpyrrolidone, or a derivative thereof. The main characteristics of the above dispersants are that they are very similar to the solvent structure, have high solubility in the solvent, can produce a solvation effect with the solvent, and have good anti - sedimentation properties.

[0041] In some embodiments, the weight - average molecular weight of the dispersant is 2000 - 1500000, preferably 30000 - 250000. For example, the weight - average molecular weight of the dispersant can be 2000, 5000, 8000, 9000, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000, 100000, 200000, 300000, 400000, 500000, 600000, 700000, 800000, 900000, 1000000, 1100000, 1200000, 1300000, 1400000, 1500000, etc.

[0042] In this application, there is no limitation on the method for measuring the weight - average molecular weight of the dispersant, and those skilled in the art can use conventional methods in the art for measurement. For example, it can be measured by gel permeation chromatography (GPC) method.

[0043] In some embodiments, the mass ratio of the solid electrolyte, rheological aid, and dispersant is 100:0.5 - 5:0.3 - 5.

[0044] For example, the mass ratio of the solid electrolyte, rheological aid, and dispersant (m 固体电解质 :m 流变助剂 :m 分散剂)For example, it can be 100:0.5:0.3, 100:0.5:1, 100:0.5:2, 100:0.5:3, 100:0.5:4, 100:0.5:5, 100:1:0.5, 100:1:1, 100:1:2, 100:1:3, 100:1:4, 100:1:5, 100:1.5:0.5, 100:1.5:1, 100:1.5:2, 100:1.5:3, 100:1.5:4, 100:1.5:5, 100:2:0.5, 100:2:1, 100:2:2, 100:2:3, 100:2:4, 100:2:5, 100:2.5:0.5, 100:2.5:1, 100:2.5:2, 100:2.5:3, 100:2.5:4, 100:2.5:5, 100:3:0.5, 100:3:1, 100:3:1.5, 100:3:2, 100:3:3, 100:3:4, 100:3:5, 100:3.5:0.5, 100:3.5:1, 100:3.5:2, 100:3.5:3, 100:3.5:4, 100:3.5:5, 100:4:0.5, 100:4:1, 100:4:2, 100:4:3, 100:4:4, 100:4:5, 100:4.5:0.5, 100:4.5:1, 100:4.5:2, 100:4.5:3, 100:4.5:4, 100:4.5:5, 100:5:0.5, 100:5:1, 100:5:2, 100:5:3, 100:5:4, 100:5:5.

[0045] In some embodiments, the solid electrolyte is selected from one or more of perovskite-type solid electrolytes, garnet-type solid electrolytes, sodium superionic conductor (NASICON)-type solid electrolytes, lithium superionic conductor (LiSICON)-type solid electrolytes, and phosphate-based solid electrolytes, preferably phosphate-based solid electrolytes.

[0046] In the present application, for perovskite-type solid electrolytes, no limitation is made in the present application, and those skilled in the art can adopt conventional perovskite-type solid electrolytes in the art, and its molecular formula is Li 3y A3 2 / 3-y B3O3, where 0.01 ≤ y ≤ 0.5, A3 can include one or more of La, Al, Mg, Fe, and Ta, and B3 can include one or more of Ti, Nb, Sr, and Pr. For example, it can be lanthanum lithium titanate (Li4LaxTi5O 12 ), lanthanum gallate-based (LaGaO3), barium cerate-based (BaCeO3), zirconia-based (ZrO2), lanthanum lithium zirconate (Li7La3Zr2O12 ) etc.;

[0047] The molecular formula of the garnet-type solid electrolyte is Li 7+m-n-3z A 4m Zr 2-n B4 n O 12 , where m, n, and z are all in the range greater than 0 and less than or equal to 1. A4 includes one or more of La, Ca, Sr, Ba, and K. B4 includes one or more of Ta, Nb, W, and the hafnium element Hf. For example, it can be LLZO (lithium lanthanum zirconium oxide), LLZTO (lithium lanthanum zirconium titanium oxide), etc.;

[0048] The molecular formula of the sodium superionic conductor (NASICON)-type solid electrolyte is Li 1+x A2 x B2 2-x (PO4)3, where 0.01 ≤ x ≤ 0.5. A2 includes one or more of Al, Y, Ga, Cr, In, Fe, Se, and La. B2 includes one or more of Ti, Ge, Ta, Zr, Sn, Fe, V, and the hafnium element Hf. For example, it can be Na3Zr2Si2PO 12 (NZSP), Li 1.3 Al 0.3 Ti 1.7 (PO4)3 (LATP), Li3Zr2Si2PO 12 (LZSP), etc.

[0049] The lithium superionic conductor (LiSICON)-type solid electrolyte can be, for example, Li 3+x X x Y 1-x O4 (X = Si, Sc, Ge, Ti; Y = P, As, V, Cr; x = 0 - 1).

[0050] In some embodiments, the solvent is selected from one or more of N-methyl-2-pyrrolidone (NMP), acetonitrile, N,N-dimethylformamide (DMF), dimethylacetamide (DMA), and dimethyl carbonate, preferably N-methyl-2-pyrrolidone.

[0051] The slurry described in this application may further contain a lithium salt, a binder, and other additives.

[0052] In some embodiments, the lithium salt is selected from lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, lithium trifluoromethanesulfonate, lithium bis(trifluoromethanesulfonyl)imide, etc.;

[0053] In some embodiments, the binder is selected from one or more of polyvinylidene fluoride, carboxymethyl cellulose, polyacrylic acid resin, polyacrylonitrile, styrene-butadiene rubber, nitrile polymer, polytetrafluoroethylene, polyolefins, fluororubber, sodium alginate, polyacrylamide, polymethyl methacrylate-butyl acrylate, ethylene-vinyl acetate copolymer, polyvinyl acetate or polyurethane or gelatin.

[0054] In some embodiments, the other additives can be selected as film-forming additives such as vinylene carbonate (VC), fluorinated carbonate, etc.; flame retardant additives such as trimethyl phosphate (TMP), etc.; overcharge protection additives such as biphenyl, etc.; conductive additives such as carbon nanotubes (CNT), graphene, SP, etc., and lithium salt stabilizers such as trimethyl borate (TMB), etc.

[0055] The slurry described in the present application may also be composed only of a solid electrolyte, a rheological aid, a dispersant and a solvent.

[0056] By compounding the rheological aid and the dispersant, the stability of the slurry described in the present application can be improved, that is, the change rate of the solid content within 60 days is relatively low, and the particle size change rate is also relatively low.

[0057] In the present application, there is no limitation on the method for measuring the solid content, and it can be measured by a conventional method in the art. In this article, drying test is carried out in a blast drying oven at 140 °C for 4 h, and it can be measured with reference to the method of GB 12005.2-1989 "Determination Method for Solid Content of Polyacrylamide".

[0058] In the present application, there is no limitation on the method for measuring the particle size, and it can be measured by a conventional method in the art. For example, it can be measured with a Malvern 3000 laser particle size analyzer.

[0059] The present application provides the use of the above-mentioned solid electrolyte slurry in the field of batteries, preferably in the field of lithium-ion batteries or sodium-ion batteries.

[0060] The present application provides a battery, which includes the above-mentioned solid electrolyte slurry. In some embodiments, the battery is a sodium-ion battery or a lithium-ion battery.

[0061] Examples

[0062] The present application gives a general and / or specific description of the materials and test methods used in the experiments. In the following examples, if there is no other special description, % represents wt%, that is, weight percentage. For reagents or instruments whose manufacturers are not indicated, they are all conventional reagent products that can be obtained through commercial purchase.

[0063] Preparation of the slurry in Example 1

[0064] Mix 1500 g of lithium titanium aluminum phosphate LATP and 1000 g of N-methylpyrrolidone NMP, add them to a sand mill, add the dispersant PVP with a molecular weight of 46000, and then start grinding. After grinding to 320 nm, test the solid content of the slurry. Then add a dispersant (PVP, with a tested molecular weight of 45600) accounting for 0.5% of the solid matter mass, and a rheology aid (fumed silica, with a tested specific surface area of 151.34 m 2 / g and a hydroxyl content of 1.96%) accounting for 2.0% of the solid matter mass, continue grinding until completely dispersed, and add solvent to dilute to a solid content of 57% to obtain the final slurry.

[0065] Preparation of the slurry in Example 2

[0066] The difference between Example 2 and Example 1 is that fumed silica with a specific surface area of 206.42 m 2 / g and a hydroxyl content of 2.66% is used to prepare the slurry.

[0067] Preparation of the slurry in Example 3

[0068] The difference between Example 3 and Example 1 is that fumed silica with a specific surface area of 310.37 m 2 / g and a hydroxyl content of 4.18% is used to prepare the slurry.

[0069] Preparation of the slurry in Example 4

[0070] The difference between Example 4 and Example 1 is that the rheology aid replaces silica with polyamide wax (melting point: 120 °C). After testing, the weight-average molecular weight of polyamide wax is 853, and through infrared comparison testing, the -CONH- content is 15.41%.

[0071] Preparation of the slurry in Example 5

[0072] The difference between Example 5 and Example 4 is that the melting point of polyamide wax is 135 °C. After testing, the weight-average molecular weight of polyamide wax is 866, and through infrared comparison testing, the -CONH- content is 20.32%.

[0073] Preparation of the slurry in Example 6

[0074] The difference between Example 6 and Example 4 is that the melting point of polyamide wax is 145 °C. After testing, the weight-average molecular weight of polyamide wax is 840, and through infrared comparison testing, the -CONH- content is 30.17%.

[0075] Preparation of the slurry in Comparative Example 1

[0076] The difference between Comparative Example 1 and Example 2 is that no rheology aid and dispersant are added to prepare the slurry.

[0077] Preparation of the slurry for Comparative Example 2

[0078] The difference between Comparative Example 2 and Example 2 is that only the dispersant PVP is added, and silica is not added to prepare the slurry.

[0079] Preparation of the slurry for Comparative Example 3

[0080] The difference between Comparative Example 3 and Example 2 is that only the rheology aid silica is added, and the dispersant PVP is not added to prepare the slurry.

[0081] Comparative Example 4

[0082] The difference between Comparative Example 4 and Example 5 is that only polyamide wax is added, and the dispersant PVP is not added to prepare the slurry.

[0083] Experimental Example 1 Stability Test

[0084] The slurries obtained in Examples 1-6 and Comparative Examples 1-4 were stored in a sealed manner at room temperature. After 60 days, the solid content and particle size of the slurries were tested. The results are shown in Table 1. Among them, the method for measuring the solid content is as follows: Take 1.0 - 2.0 g of the slurry in a watch glass and dry it in a forced-air drying oven at 140 °C for 4 h for testing; the particle size test was carried out using a Malvern 3000 laser particle size analyzer.

[0085] Table 1

[0086] 60-day fixed solid content change rate (D50) 60-day particle size change rate (D50) Example 1 -1.35％ +0.00％ Example 2 -0.96％ +0.00％ Example 3 -0.86％ +1.30％ Example 4 -1.33％ +2.61％ Example 5 -0.81％ +1.96％ Example 6 -0.74％ +3.27％ Comparative Example 1 -11.93％ +5.31％ Comparative Example 2 -1.88％ +11.56％ Comparative Example 3 -4.74％ 0.00％ Comparative Example 4 -3.36％ +5.34％

[0087] As can be seen from the above table, the electrolyte slurries prepared in Examples 1-6 are conducive to long-term storage stability. While the solid content is stable, the particle size can also be maintained uniformly.

[0088] Continuing to compare Examples 1, 5 and Comparative Examples 1-4, it can be known that when fumed silica or polyamide wax is used in combination with PVP, the stability of the slurry is significantly better than that when only the rheology aid fumed silica, polyamide wax, and the dispersant PVP are used alone, and it is significantly better than directly dispersing the electrolyte.

[0089] When fumed silica or polyamide wax is used in combination with PVP, the advantages of both can be taken into account. The rheology aid (fumed silica or polyamide wax) plays a mediating role, promoting the formation of a three-dimensional network structure of the solid electrolyte, dispersant, and rheology aid through hydrogen bonds. The introduction of PVP improves the interaction between the network structure and the solvent, further improving the stability of the slurry. The prepared slurry takes into account both the anti-settling property and the stability of the slurry, effectively improving the storage and transportation stability of the slurry. The dispersant and the particles do not directly form hydrogen bonds, which can well inhibit particle agglomeration.

[0090] The above are only the preferred embodiments of the present application, and are not intended to limit the present application in any other form. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the technical solution content of the present application still fall within the protection scope of the technical solution of the present application.

Claims

1. A solid electrolyte slurry comprising a solid electrolyte, a rheological additive, a dispersant and a solvent.

2. The solid electrolyte slurry according to claim 1, wherein The rheological additive is an organic compound containing active hydrogen atoms or an inorganic compound containing active hydrogen atoms.

3. The solid electrolyte slurry according to claim 2, wherein: The organic compound is polyamide wax.

4. The solid electrolyte slurry according to claim 3, wherein: The melting point of the polyamide wax is 120-170° C., and / or, The amide content in the polyamide wax is 10-50%, preferably 10-35%.

5. The solid electrolyte slurry according to claim 2 or 3, wherein the weight average molecular weight of the polyamide wax is 200-10000, preferably 500-3000.

6. The solid electrolyte slurry according to claim 2, wherein: The inorganic compound is fumed silica.

7. The solid electrolyte slurry according to claim 6, wherein the specific surface area of ​​the fumed silica is 100-500 m 2 / g, preferably 150-400m 2 / g; and / or The surface hydroxyl content of the fumed silica is 1.5-5.0%.

8. The solid electrolyte slurry according to claim 1, wherein the weight average molecular weight of the dispersant is 2000-1500000, preferably 30000-250000. 9 . The solid electrolyte slurry according to claim 1 , wherein the dispersant is polyethylene oxide, polypropylene oxide, ethylene oxide-propylene copolymer, polyvinyl pyrrolidone or a derivative thereof.

10. The solid electrolyte slurry according to claim 1, wherein the solid electrolyte slurry has a solid content of 30-70%, and / or The mass ratio of the solid electrolyte, the rheological additive and the dispersant is 100:0.5-5:0.3-5.

11. A solid electrolyte slurry according to any one of claims 1 to 10, wherein the solid electrolyte is selected from one or more of a perovskite solid electrolyte, a garnet solid electrolyte, a sodium superion conductor (NASICON) solid electrolyte, a lithium superion conductor (LiSICON) solid electrolyte and a phosphate solid electrolyte, preferably a phosphate solid electrolyte.

12. The solid electrolyte slurry according to any one of claims 1 to 11, wherein the solvent is selected from one or more of N-methyl-2-pyrrolidone, acetonitrile, N,N-dimethylformamide, dimethylacetamide and dimethyl carbonate, preferably N-methyl-2-pyrrolidone.

13. Use of the solid electrolyte slurry according to any one of claims 1 to 12 in the field of batteries, preferably in the field of lithium ion batteries or sodium ion batteries.

14. A battery comprising the solid electrolyte slurry according to any one of claims 1 to 12; optionally, the battery is a sodium ion battery or a lithium ion battery.