Washing composition for solid electrolyte slurry and solid electrolyte slurry preparation method using same

Abstract

This washing composition for a solid electrolyte slurry comprises a compound represented by chemical formula 1 below: <Chemical formula 1> In chemical formula 1, R1 is hydrogen or an alkyl group, X1 and X2 are each independently O, N, or S, and L1 is a linear or branched alkylene.

Description

Cleaning composition for solid electrolyte slurry and method for producing solid electrolyte slurry using the same

[0001] The present invention relates to a cleaning composition for a solid electrolyte slurry and a method for producing a solid electrolyte slurry using the same.

[0002]

[0003] Recent industrial demands have led to the active development of batteries with high energy density and safety. For example, lithium-ion batteries are being used not only in information and communication devices, but also in the automotive sector. Safety is particularly important in the automotive sector, as it is directly related to life.

[0004] Recently, all-solid-state batteries have been proposed, replacing the electrolyte in lithium-ion batteries with a solid electrolyte. By eliminating the use of flammable organic dispersion media, all-solid-state batteries significantly reduce the risk of fire or explosion in the event of a short circuit. Therefore, these all-solid-state batteries can offer superior safety.

[0005]

[0006] The problem to be solved by the present invention is to provide a cleaning composition for a solid electrolyte slurry that can improve the dispersion characteristics of the solid electrolyte slurry.

[0007] Another problem to be solved by the present invention is to provide a method for producing a solid electrolyte slurry capable of improving the dispersion characteristics of the solid electrolyte slurry.

[0008]

[0009] According to the concept of the present invention, a cleaning composition for a solid electrolyte slurry comprises a compound represented by the following chemical formula 1.

[0010] <Chemical Formula 1>

[0011]

[0012] In the above chemical formula 1,

[0013] The above R1 is hydrogen or an alkyl group, the above X1 and X2 are each independently O, N or S, and the above L1 is a straight or branched chain alkylene.

[0014] According to another concept of the present invention, a method for producing a solid electrolyte slurry comprises: mixing a solid electrolyte, a binder, and a solvent to produce a slurry mixture; performing a mixing process on the slurry mixture using a mixing facility to produce a solid electrolyte slurry; and introducing a cleaning composition to wash away residues of the solid electrolyte slurry within the mixing facility, wherein the cleaning composition is the cleaning composition according to claim 1.

[0015]

[0016] The cleaning composition for a solid electrolyte slurry according to the present invention comprises a compound of the propylene glycol methyl ether acetate (PGMEA) series, thereby effectively dispersing the residue of the solid electrolyte slurry after mixing the solid electrolyte slurry. This facilitates the cleaning of the residue of the solid electrolyte slurry.

[0017]

[0018] FIG. 1 is a flowchart showing a method for manufacturing a solid electrolyte slurry using a cleaning composition according to embodiments of the present invention.

[0019] FIG. 2A and FIG. 2B are schematic diagrams each illustrating a method for producing a solid electrolyte slurry using a cleaning composition according to embodiments of the present invention.

[0020] Figure 3 shows the results of comparing the dispersion of the slurries of Example 1 and Comparative Examples 1 and 2 before and after standing.

[0021] Figure 4a is a photograph showing Example 2 and Comparative Examples 3 to 4.

[0022] Figure 4b shows the results of measuring the temperature of Example 2 and Comparative Examples 3 to 4 of Figure 4a.

[0023]

[0024] To fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and subject to various modifications. However, the description of these embodiments is provided solely to ensure a complete disclosure of the present invention and to fully inform those skilled in the art of the invention of the scope of the invention.

[0025] In this specification, when a component is referred to as being on another component, it means that it can be formed directly on the other component, or a third component may be interposed between them. Furthermore, in the drawings, the thicknesses of the components are exaggerated for the sake of clarity. Parts designated by the same reference numerals throughout the specification represent the same components.

[0026] Embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for the purpose of effectively explaining the technical contents. Accordingly, the regions illustrated in the drawings have a schematic nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, and third are used to describe various components in various embodiments of the present specification, these components should not be limited by such terms. These terms are used only to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

[0027] The terminology used herein is for the purpose of describing embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the words "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components.

[0028] Unless otherwise defined herein, the particle size may be the average particle size. In addition, the particle size refers to the average particle size (D50), which means the diameter of particles with a cumulative volume of 50% by volume in a particle size distribution. The average particle size (D50) can be measured by a method well known to those skilled in the art, for example, by measuring with a particle size analyzer, or by measuring with a transmission electron microscope (TEM) photograph or a scanning electron microscope (SEM) photograph. Alternatively, the average particle size (D50) value can be obtained by measuring with a measuring device that utilizes dynamic light-scattering, performing data analysis to count the number of particles for each particle size range, and calculating from the counted number. Alternatively, the average particle size (D50) value can be obtained by measuring with a laser diffraction method. When measuring by laser diffraction, more specifically, after the particles to be measured are dispersed in a dispersion medium, they are introduced into a commercially available laser diffraction particle size measuring device (e.g., Microtrac MT 3000) and irradiated with ultrasonic waves of approximately 28 kHz at an output of 60 W, and the average particle size (D50) based on 50% of the particle size distribution in the measuring device can be calculated.

[0029] FIG. 1 is a flowchart illustrating a method for producing a solid electrolyte slurry using a cleaning composition according to embodiments of the present invention. FIG. 2a and FIG. 2b are schematic diagrams each illustrating a method for producing a solid electrolyte slurry using a cleaning composition according to embodiments of the present invention.

[0030]

[0031] Cleaning composition for solid electrolyte slurry

[0032] A cleaning composition (300) for a solid electrolyte slurry according to embodiments of the present invention may include a compound represented by the following chemical formula 1.

[0033] <Chemical Formula 1>

[0034]

[0035] In the above chemical formula 1, R1 is hydrogen or a C1 to C3 alkyl group, X1 and X2 are each independently O, N or S, and L1 may be a straight or branched C1 to C5 alkylene. The compound represented by the above chemical formula 1 may be Propylene glycol methyl ether acetate (PGMEA).

[0036] The concentration of the compound represented by the above chemical formula 1 may be 10 wt% to 100 wt% relative to the total weight of the cleaning composition (300) for solid electrolyte slurry.

[0037]

[0038] Method for preparing solid electrolyte slurry

[0039] Referring to FIGS. 1, 2a, and 2b, a method for manufacturing a solid electrolyte slurry according to embodiments of the present invention may include mixing a solid electrolyte, a binder, and a solvent to manufacture a slurry mixture (200) (S10), performing a mixing process on the slurry mixture (200) with a mixing facility (100) to manufacture a solid electrolyte slurry (SL) (S20), and adding a cleaning composition (300) to wash away residue (400) of the solid electrolyte slurry within the mixing facility (100).

[0040] A slurry mixture (200) can be prepared by introducing a solid electrolyte, a binder, and a solvent into a container and mixing them (S10). The solid electrolyte may be a powder-type solid electrolyte. According to one embodiment, the solid electrolyte may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics.

[0041] A sulfide-based solid electrolyte can be manufactured by treating starting materials such as Li2S and P2S5 by a melting rapid cooling method or a mechanical milling method, for example. In addition, a heat treatment can be performed after the treatment. The solid electrolyte can be amorphous, crystalline, or a mixture thereof. In addition, the solid electrolyte can be, for example, a material containing sulfur (S), phosphorus (P), and lithium (Li) as constituent elements among the above-described sulfide-based solid electrolyte materials. For example, the solid electrolyte can be a material containing Li2S-P2S5. When using a sulfide-based solid electrolyte material containing Li2S-P2S5 to form a solid electrolyte, the mixing molar ratio of Li2S and P2S5 is, for example, in the range of Li2S:P2S5=50:50 to 90:10.

[0042] Sulfide-based solid electrolytes include, for example, Li2S-P2S5, Li2S-P2S5-LiX (X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, Li2S-P2S5-Z m S n (m, n are positive numbers, capital letter “Z” represents Ge, Zn or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, capital letter “M” is one of P, Si, Ge, B, Al, Ga In), Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may include at least one selected from (0≤x≤2).

[0043] Sulfide-based solid electrolytes include, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may be an argyrodite-type compound including at least one selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound including at least one selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I.

[0044] Sulfide-based solid electrolytes include, for example, Li7-a M a PS 6-c X c It may include an argyrodite-type compound represented by (0≤a≤2, 0≤c≤2). The X may be F, Br, Cl, or a combination thereof. The above M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi) or these. It could be a combination.

[0045] The binder may include, for example, at least one selected from the group consisting of a cellulose polymer, a rubber binder, an acrylate binder, an imide binder, a polyvinylidene fluoride binder, a polyvinylpyrrolidone binder, a nitrile binder, an acetate binder, and a cyano binder.

[0046] The cellulose-based polymer may include at least one selected from the group consisting of, for example, carboxymethyl cellulose (CMC), methyl cellulose (MC), hydroxypropyl cellulose (HPC), methyl hydroxypropyl cellulose (MHPC), ethyl hydroxyethyl cellulose (EHEC), methyl ethyl hydroxyethyl cellulose (MEHEC), and cellulose gum.

[0047] The above acrylate compound may be, for example, polyacrylic acid (PAA), polymethylmethacrylate, polyisobutylmethacrylate, polyethylacrylate, polybutyl acrylate, or polyethylhexyl acrylate (poly(2-ethylhexyl acrylate)).

[0048] The above imide compound may be, for example, polyimide or polyamide imide.

[0049] The polyvinylidene fluoride compound may be, for example, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polyvinylidene fluoride-co-tetrafluoroethylene, polyvinylidene fluoride-co-trifluoroethylene, polyvinylidene fluoride-co-trifluorochloroethylene, polyvinylidene fluoride-co-hexafluoropropylene (PVdF) or polyvinylidene fluoride-co-trichloroethylene.

[0050] The above polyvinylpyrrolidone compound may be, for example, polyvinylpyrrolidone.

[0051] The nitrile compound may be, for example, polyacrylonitrile or an acrylonitrile-styrene-butadiene copolymer.

[0052] The acetate compound may be, for example, polyvinylacetate, polyethylene-co-vinyl acetate, cellulose acetate, cellulose acetate butyrate, or cellulose acetate propionate.

[0053] The above cyano compound may be, for example, cyanoethyl sucrose.

[0054] In one embodiment of the present invention, the binder may include at least one of carboxymethyl cellulose (CMC), styrene butadiene rubber (SBR), and nitrile butadiene rubber (NBR).

[0055] The binder may be added, for example, so that the binder content in the slurry mixture (200) is 1 wt% to 10 wt%. If the binder content is less than the above range, the binder dispersion effect may be reduced in the kneading process described below. If the binder content exceeds the above range, the slurry phase stability may be reduced due to binder agglomeration.

[0056] For example, the solvent may include at least one selected from the group consisting of water, methanol, ethanol, ethylene glycol, diethylene glycol, glycerol, isobutyryl isobutyrate, xylene, toluene, benzene, and hexane. The solvent may include an aqueous solvent. The type of the aqueous solvent may not be limited. In one embodiment, the solvent may be water.

[0057] The solids content of the slurry mixture (200) can be controlled through the solvent. The solids content of the slurry mixture according to the present embodiment can be controlled to, for example, 40 wt% to 70 wt%.

[0058] A mixing process can be performed on a slurry mixture (200) using a mixing facility (100) (S20). The mixing process can be performed using a mixer or a kneader. In one embodiment of the present invention, the mixing process can be performed using a mixing facility (100) including at least one selected from the group consisting of a PD mixer (Planetary Disperser mixer), a planetary mixer, a paddle mixer, a ribbon mixer, a dual shaft mixer mixer, a high-speed impeller mixer, or a propeller mixer.

[0059] The mixing process may further include a kneading process. The kneading process may be performed multiple times (e.g., twice) and sequentially within a single mixer. The solids content of the slurry mixture (200) may be controlled through the kneading process, thereby producing a solid electrolyte slurry (SL) having a desired viscosity.

[0060] A defoaming process may be further performed on the solid electrolyte slurry (SL) after the mixing process has been completed. The defoaming process can remove air bubbles remaining within the solid electrolyte slurry (SL).

[0061] The solid electrolyte slurry (SL) that has undergone the defoaming process can be recovered from the mixing equipment (100). The recovered solid electrolyte slurry (SL) can be used in a coating process to form a solid electrolyte layer. Residues (400) of the solid electrolyte slurry may remain inside the mixing equipment (100) from which the solid electrolyte slurry (SL) has been removed.

[0062] A cleaning composition (300) can be introduced to clean the residue (400) of the solid electrolyte slurry remaining in the mixing equipment (100) (S30). The cleaning composition (300) may be the cleaning composition (300) for the solid electrolyte slurry described above. The residue (400) of the solid electrolyte slurry can be dispersed by the cleaning composition (300).

[0063] The particle size (i.e., particle diameter) and its distribution of the residue (400) of the solid electrolyte slurry can be measured using dynamic light scattering (DLS) or laser diffraction. The particle diameter of the residue (400) of the solid electrolyte slurry can be, for example, 1 μm or more and 10 μm or less.

[0064] The degree of dispersion can be measured by measuring the phase angle of the cleaning composition (300) that has been cleaned, represented by the following general formula 1. In the present specification, the degree of dispersion can mean the degree to which the particles of the residue (400) of the solid electrolyte slurry in the cleaning composition (300) do not aggregate and are evenly distributed in the cleaning composition (300).

[0065] [General Formula 1]

[0066] δ = tan -1 (G" / G')

[0067] In the general formula 1 above, G' and G" are the storage modulus (G') and loss modulus (G") measured using a rheometer for the cleaning composition (300) at a temperature of 25°C, and the frequency of the rheometer has a range of 0.1 Hz to 10 Hz. For example, the cleaning composition (300) may have a phase angle represented by the general formula 1 in a range of 45° to 80°.

[0068] Change rate (V) of storage elastic modulus (G') according to temperature change of the washing composition (300) after washing G'_up and V G'_down ) and the rate of change of loss modulus (G'') with temperature change (VG''_up and V G''_down ) can be measured to measure the dispersion of the residue (400) of the solid electrolyte slurry.

[0069] Specifically, when the temperature increases, the rate of change (V) of the storage modulus (G') according to the temperature change G'_up )" and "When the temperature decreases, the rate of change in the storage elastic modulus (G') according to the temperature change (V G'_down )" can be measured. At this time, V G'_up It can mean the rate of change of storage elastic modulus (G') according to the measured temperature change when the temperature increases continuously in the range of 25℃ to 85℃. V G'_down It can mean the rate of change of storage elastic modulus (G') according to temperature change measured when temperature continuously decreases in the range of 85℃ to 25℃. V G'_up and V G'_down The measurement can be made while keeping the frequency of the rheometer fixed. For example, V is measured while keeping the frequency of the rheometer fixed at 1 Hz. G'_up and V G'_down This can be measured. V G'_up and V G'_down For example, it can satisfy the value expressed by the following general formula 2.

[0070] [General Formula 2]

[0071] 0.85 ≤ V G'_up / V G'_down ≤ 1.2

[0072] Specifically, when the temperature increases, the rate of change (V) of the loss modulus (G") according to the temperature change G'_up )" and "When the temperature decreases, the rate of change in the loss modulus (G") according to the temperature change (V G''_down )" can be measured. At this time, V G'_up It can mean the rate of change of loss modulus (G") according to temperature change measured when temperature increases continuously in the range of 25℃ to 85℃. V G''_downIt can mean the rate of change of loss modulus (G") according to temperature change measured when the temperature decreases continuously in the range of 85℃ to 25℃. V G''_up and V G''_down For example, it can satisfy the value expressed by the following general formula 3.

[0073] [General Formula 3]

[0074] 0.85 ≤ V G''_up / V G''_down ≤ 1.2

[0075] V G'_up / V G'_down and V G''_up / V G''_down The closer the value is to 1, the more uniform the dispersion may be. When the residue (400) of the solid electrolyte slurry is uniformly dispersed in the cleaning composition (300), the change rate (V) of the storage modulus (G') according to the temperature change G'_up and V G'_down ) and the rate of change of loss modulus (G'') (V G''_up and V G''_down ) may have the values ​​of the general formulas 2 and 3, respectively. As a result, the dispersion characteristics of the residue (400) of the solid electrolyte slurry may be improved due to the cleaning composition (300), and the cleaning of the residue (400) of the solid electrolyte slurry may be facilitated.

[0076]

[0077]

[0078] Hereinafter, embodiments of the present invention will be described in more detail. However, the following embodiments are provided merely to aid understanding of the present invention, and the scope of the present invention is not limited thereby.

[0079]

[0080] Example 1

[0081] A slurry mixture was prepared by placing a sulfide-based solid electrolyte, acrylate rubber, and a low-polarity solvent into a container. The solid content of the mixture was adjusted to [70 wt%]. The composition of the slurry mixture was such that the sulfide-based solid electrolyte: acrylate rubber was [98:2 weight ratio].

[0082] The above slurry mixture was placed in a PD (Planetary Despa) mixer and kneaded. Kneading was performed [at 75 rpm for 50 minutes].

[0083] The slurry after the kneading process was defoamed [for 30 minutes].

[0084] 2 g of solid electrolyte slurry and 10 ml of Propylene glycol methyl ether acetate (PGMEA) were placed in a 20 ml vial.

[0085]

[0086] Comparative Example 1

[0087] A vial was prepared in the same manner as in Example 1 described above, except that 10 ml of Octyl Acetate (OA) was used instead of PGMEA.

[0088]

[0089] Comparative Example 2

[0090] A vial was prepared in the same manner as in Example 1 described above, except that 10 ml of 1,2-Dichloroethane (DCE) was used instead of PGMEA.

[0091]

[0092] Experimental Example 1: Comparison of dispersion of slurry before and after standing

[0093] The dispersion of the slurry for each solvent was confirmed according to Example 1, Comparative Example 1, and Comparative Example 2. Specifically, the vials of Example 1, Comparative Example 1, and Comparative Example 2 were left as is without shaking or mixing the contents. The leaving was performed at room temperature. Then, after 5 minutes and 15 minutes, the vials were inverted to check for residue at the bottom of the vials. The results are shown in Fig. 3.

[0094] Referring to Figure 3, in Example 1, most of the sediment remaining at the bottom of the container was dispersed after 15 minutes of standing. In contrast, in Comparative Examples 1 and 2, sediment remained undispersed at the bottom of the container. It can be confirmed that the cleaning composition (PGMEA) of Example 1 effectively disperses the slurry compared to the solvents of Comparative Examples 1 and 2.

[0095]

[0096] Example 2

[0097] A vial was prepared in the same manner as in Example 1 described above using 1 g of solid electrolyte slurry and 10 ml of PGMEA.

[0098]

[0099] Comparative Example 3

[0100] A vial was prepared in the same manner as in Example 2 described above, except that 10 ml of Octyl Acetate (OA) was used instead of PGMEA.

[0101]

[0102] Comparative Example 4

[0103] A vial was prepared in the same manner as in Example 2 described above, except that 10 ml of Ethyl Alcohol (EtOH) was used instead of PGMEA.

[0104]

[0105] Experimental Example 2: Measurement of hydrogen sulfide (H2S) gas production and exothermic temperature

[0106] The amount of hydrogen sulfide (H2S) gas generated and the temperature during slurry washing for each solvent were measured according to Example 2, Comparative Example 3, and Comparative Example 4. Gas measurement was performed using a Honeywell minimax X4 4-Gas (measurement range: 0 to 250 ppm). Temperature measurement was performed using a FLIR TG165 Spot thermal camera (measurement range: -25°C to 380°C).

[0107] Referring to Fig. 4a, the solid electrolyte slurry was dispersed in the solvent in Example 2, Comparative Example 3, and Comparative Example 4. When the gas generated was measured, hydrogen sulfide (H2S) was generated at 2 ppm or less in Example 2. In Comparative Example 3, hydrogen sulfide (H2S) was generated at 10 ppm or more, causing an alarm in the measuring device to sound. In Comparative Example 4, hydrogen sulfide (H2S) was generated at 10 ppm or more, causing an alarm in the measuring device to sound. This shows that Example 2 generated less hydrogen sulfide (H2S) gas than Comparative Examples 3 and 4. In other words, it can be seen that the cleaning composition of Example 2 has less reactivity with the sulfide-based solid electrolyte than the solvents of Comparative Examples 3 and 4, and thus the cleaning process can be performed in a more stable state.

[0108] Referring to Fig. 4b, after the slurry was dispersed in the solvent, the temperature of Example 2 was measured to be 21°C, the same as room temperature. This confirms that almost no heat generation occurs while the slurry is dispersed in the solvent.

[0109] The temperature of Comparative Example 4 was measured to be 32°C. This shows that the solvent of Example 2 generates little heat during slurry dispersion compared to the solvent of Comparative Example 4. In other words, the cleaning composition (PGMEA) of Example 2 has a lower exothermic temperature than the solvent of Comparative Example 4 due to its lower reactivity with the sulfide-based solid electrolyte, allowing the cleaning process to be performed in a more stable state.

[0110]

[0111] While embodiments of the present invention have been described with reference to the attached drawings, the present invention may be implemented in other specific forms without altering the technical spirit or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. A cleaning composition for a solid electrolyte slurry comprising a compound represented by the following chemical formula 1: <Chemical Formula 1> In the above chemical formula 1, The above R1 is hydrogen or an alkyl group, The above X1 and X2 are each independently O, N or S, The above L1 is a straight or branched chain alkylene.

2. In paragraph 1, A cleaning composition for a solid electrolyte slurry, wherein R1 is hydrogen or an alkyl group of C1 to C3.

3. In paragraph 1, A cleaning composition for a solid electrolyte slurry, wherein the above L1 is a straight or branched C1 to C5 alkylene.

4. In paragraph 1, The above solid electrolyte slurry is a cleaning composition for a solid electrolyte slurry containing a sulfide-based solid electrolyte.

5. In paragraph 4, The above sulfide-based solid electrolyte is Li2S-P2S5, Li2S-P2S5-LiX (X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, Li2S-P2S5-Z m S n (m, n are positive numbers, capital letter “Z” is Ge, Zn or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, capital letter “M” is one of P, Si, Ge, B, Al, Ga or In), Li7-xPS 6-x Cl x (0≤x≤2), Li7-xPS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x A cleaning composition for a solid electrolyte slurry comprising at least one selected from (0≤x≤2).

6. In paragraph 4, The above sulfide-based solid electrolyte is Li 7-a M a PS 6-c X c Contains an argyrodite-type compound represented by (0≤a≤2, 0≤c≤2), wherein X is F, Br, Cl or a combination thereof, The above M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi) or these. A cleaning composition for a combination solid electrolyte slurry.

7. In paragraph 4, A cleaning composition for a solid electrolyte slurry, wherein the solid content of the solid electrolyte slurry is 40 wt% to 70 wt%.

8. In paragraph 1, A cleaning composition for a solid electrolyte slurry, wherein the concentration of the compound represented by the above chemical formula 1 is 10 wt% to 100 wt% based on the total weight of the cleaning composition for a solid electrolyte slurry.

9. In paragraph 1, A cleaning composition for a solid electrolyte slurry, wherein the compound represented by the above chemical formula 1 is Propylene glycol methyl ether acetate (PGMEA).

10. Preparing a slurry mixture by mixing a solid electrolyte, binder, and solvent; Performing a mixing process on the above slurry mixture using a mixing facility to produce a solid electrolyte slurry; and Including washing away the residue of the solid electrolyte slurry within the mixing facility by introducing a washing composition, A method for producing a solid electrolyte slurry, wherein the above cleaning composition is a cleaning composition according to claim 1.

11. In paragraph 10, A method for producing a solid electrolyte slurry, wherein the binder comprises at least one selected from the group consisting of a cellulose-based binder, a rubber-based binder, an acrylate-based binder, an imide-based binder, a polyvinylidene fluoride-based binder, a polyvinylpyrrolidone-based binder, a nitrile-based binder, an acetate-based binder, and a cyano-based binder.

12. In paragraph 10, The above solid electrolyte is a method for producing a solid electrolyte slurry containing a sulfide-based solid electrolyte.

13. In paragraph 12, The above sulfide-based solid electrolyte is Li 7-a M a PS 6-c X c Contains an argyrodite-type compound represented by (0≤a≤2, 0≤c≤2), wherein X is F, Br, Cl or a combination thereof, The above M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi) or these. A method for producing a combination solid electrolyte slurry.

14. In paragraph 10, A method for producing a solid electrolyte slurry, wherein the mixing equipment comprises at least one selected from the group consisting of a PD mixer (Planetary Disperser mixer), a planetary mixer, a paddle mixer, a ribbon mixer, a dual shaft mixer mixer, a high-speed impeller mixer, and a propeller mixer.

15. In paragraph 10, A method for producing a solid electrolyte slurry, wherein the above mixing process further includes performing a kneading process on the slurry mixture.

16. In paragraph 10, A method for producing a solid electrolyte slurry, further comprising performing a defoaming process on the solid electrolyte slurry after the mixing process has been completed.

17. In paragraph 10, A method for producing a solid electrolyte slurry in which the temperature is the same as room temperature after the washing of the residue of the solid electrolyte slurry is completed.

18. In paragraph 10, A method for producing a solid electrolyte slurry, wherein, after washing away the residue of the solid electrolyte slurry, the amount of hydrogen sulfide (H2S) generated per 1 g of the solid electrolyte slurry is measured as 2 ppm or less.

19. In paragraph 10, A method for producing a solid electrolyte slurry, wherein the average particle diameter of the residue of the solid electrolyte slurry after washing is 1 μm or more and 10 μm or less.

20. In paragraph 10, A method for producing a solid electrolyte slurry, wherein the rate of change in storage elastic modulus according to temperature change of the above-mentioned cleaning composition after cleaning is 0.85 or more and 1.2 or less.

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