Solid electrolyte composition, method for producing solid electrolyte composition, and method for producing solid electrolyte component

Abstract

The solid electrolyte composition of the present application comprises a solid electrolyte material having an ion bond and an organic solvent. The organic solvent comprises a compound having a halogen group and at least one selected from a compound having an ether group and a hydrocarbon.

Description

Technical Field

[0001] The present application relates to a solid electrolyte composition used in the manufacture of, for example, an all-solid-state battery, a method for producing the solid electrolyte composition, and a method for producing a solid electrolyte component. Background Art

[0002] Patent Document 1 discloses a solid electrolyte composition using a sulfide solid electrolyte.

[0003] Patent Document 2 discloses a battery using a halide solid electrolyte material.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2018 / 168505

[0007] Patent Document 2: International Publication No. 2018 / 025582 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] Conventionally, a solid electrolyte composition having excellent dispersion stability has been desired.

[0010] Means used to solve problems

[0011] One embodiment of the present application relates to a solid electrolyte composition comprising:

[0012] Solid electrolyte materials with ionic bonding properties, and

[0013] organic solvents,

[0014] The organic solvent includes a compound having a halogen group, and

[0015] At least one selected from compounds having an ether group and hydrocarbons.

[0016] Another aspect of the present application relates to a method for producing a solid electrolyte component, comprising the step of removing the organic solvent from the solid electrolyte composition.

[0017] Effects of the Invention

[0018] According to the present application, a solid electrolyte composition having excellent dispersion stability can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart showing an example of a method for producing a solid electrolyte composition.

[0020] Figure 2 This is a flow chart showing an example of another method for producing a solid electrolyte composition.

[0021] Figure 3 This is a flowchart showing an example of a method for manufacturing a solid electrolyte component. DETAILED DESCRIPTION

[0022] (Summary of one embodiment of this application)

[0023] The solid electrolyte composition of the first embodiment of the present application includes an ionically bonded solid electrolyte material and an organic solvent containing a compound having a halogen group and at least one selected from a compound having an ether group and a hydrocarbon.

[0024] According to the first embodiment, a solid electrolyte composition having excellent dispersion stability can be provided.

[0025] In the second aspect of the present application, for example, in the solid electrolyte composition of the first aspect, the solid electrolyte material may not contain elemental sulfur. With this configuration, a solid electrolyte composition having excellent dispersion stability can be provided.

[0026] In the third embodiment of the present application, for example, the solid electrolyte composition of the first or second embodiment may further include an organic binder. By using an organic binder, the adhesion between the solid electrolyte materials, the adhesion between the solid electrolyte and the electrode, or the adhesion between the solid electrolyte and the current collector can be improved.

[0027] In the fourth embodiment of the present application, for example, in the solid electrolyte composition of any one of the first to third embodiments, the solid electrolyte material may have lithium ion conductivity and may include at least one selected from Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb and Sm and at least one selected from F, Cl, Br and I.

[0028] In a fifth aspect of the present application, for example, in the solid electrolyte composition of any one of the first to third aspects, the solid electrolyte material may contain Li, at least one selected from Gd, Ca, Zr, and Y, and at least one selected from F, Cl, Br, and I.

[0029] In a sixth aspect of the present application, for example, in the solid electrolyte composition according to any one of the first to third aspects, the solid electrolyte material may contain Li, Y, and at least one selected from F, Cl, Br, and I.

[0030] In the seventh embodiment of the present application, for example, in the solid electrolyte composition of the fifth embodiment, the solid electrolyte material may include at least one selected from a material containing Li, Y, Cl and Br, a material containing Li, Ca, Y, Gd, Cl and Br, and a material containing Li, Zr, Y and Cl.

[0031] In the eighth embodiment of the present application, for example, in the solid electrolyte composition of the seventh embodiment, the solid electrolyte material may include a material selected from Li3YBr2Cl4, Li 2.8 Ca 0.1 Y 0.5 Gd 0.5 Br2Cl4 and Li 2.5 Y 0.5 Zr 0.5 At least one of Cl6.

[0032] According to the fourth to eighth aspects, the all-solid-state battery can exhibit excellent charge and discharge efficiency.

[0033] In the ninth aspect of the present application, for example, in the solid electrolyte composition of any one of the first to fourth aspects, the solid electrolyte material may be substantially composed only of Li, at least one selected from Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb, and Sm, and at least one selected from F, Cl, Br, and I. With this configuration, a solid electrolyte component having high lithium ion conductivity can be produced.

[0034] In the tenth aspect of the present application, for example, in the solid electrolyte composition of any one of the first to ninth aspects, the weight ratio of the compound having a halogen group to the total weight of the organic solvent can be 10% by weight or greater. This configuration can provide a solid electrolyte composition having excellent dispersion stability.

[0035] In an eleventh aspect of the present application, for example, in the solid electrolyte composition according to any one of the first to tenth aspects, the organic solvent may contain a ring structure.

[0036] In the twelfth aspect of the present application, for example, in the solid electrolyte composition of the eleventh aspect, the organic solvent may contain an aromatic compound.

[0037] According to the eleventh and twelfth aspects, the solid electrolyte material having an ion bonding property can be easily dispersed in the organic solvent.

[0038] In the thirteenth embodiment of the present application, for example, in the solid electrolyte composition of any one of the first to tenth embodiments, the compound having a halogen group may include at least one selected from 1,2,4-trichlorobenzene, chlorobenzene, 2,4-dichlorotoluene, o-chlorotoluene, 1,3-dichlorobenzene, p-chlorotoluene, 1,2-dichlorobenzene, 1,4-dichlorobutane and 3,4-dichlorotoluene.

[0039] In the fourteenth embodiment of the present application, for example, in the solid electrolyte composition of any one of the first to tenth embodiments, at least one selected from the compound having an ether group and the hydrocarbon may include at least one selected from tetralin, ethylbenzene, mesitylene, pseudocumene, xylene, cumene, dibutyl ether and anisole.

[0040] According to the thirteenth and fourteenth aspects, the solid electrolyte material having an ion bonding property can be easily dispersed in the organic solvent.

[0041] In the fifteenth aspect of the present application, for example, the solid electrolyte composition according to any one of the first to fourteenth aspects may further include an active material. When the solid electrolyte composition includes the active material, the solid electrolyte composition can have excellent dispersion stability.

[0042] A sixteenth aspect of the present application is a method for producing a solid electrolyte composition including the step of mixing an ionically bonded solid electrolyte material, a first organic solvent containing a compound having a halogen group, and a second organic solvent containing at least one selected from a compound having an ether group and a hydrocarbon.

[0043] According to the sixteenth aspect, the dispersibility and stability of the solid electrolyte material can be ensured, and the fluidity of the solid electrolyte composition can be improved.

[0044] In the seventeenth aspect of the present application, for example, in the method for producing a solid electrolyte composition according to the sixteenth aspect, a mixture containing the solid electrolyte material and the first organic solvent may be prepared, and then the mixture may be mixed with the second organic solvent.

[0045] In the eighteenth embodiment of the present application, for example, in the method for manufacturing a solid electrolyte composition of the sixteenth embodiment, an organic binder may be mixed together with the solid electrolyte material, the first organic solvent, and the second organic solvent when the solid electrolyte material, the first organic solvent, and the second organic solvent are mixed.

[0046] In the nineteenth embodiment of the present application, for example, in the method for manufacturing a solid electrolyte composition of the seventeenth embodiment, when mixing the mixture with the second organic solvent, the second organic solvent can be mixed with an organic binder to prepare an organic binder solution, and the mixture can be mixed with the organic binder solution.

[0047] According to the seventeenth to nineteenth aspects, the dispersibility and stability of the solid electrolyte material can be ensured, and the fluidity of the solid electrolyte composition can be improved.

[0048] In the twentieth aspect of the present application, for example, in the method for producing a solid electrolyte composition according to any one of the sixteenth to nineteenth aspects, at least one selected from a compound having a halogen group, a compound having an ether group, and a hydrocarbon may be further mixed into the solid electrolyte composition obtained from the solid electrolyte material, the first organic solvent, and the second organic solvent. With this configuration, the solid electrolyte composition can ensure the dispersibility and stability of the solid electrolyte material while having an appropriate viscosity.

[0049] The method for producing a solid electrolyte component according to the twenty-first aspect of the present application includes the step of removing the organic solvent from the solid electrolyte composition according to any one of the first to fifteenth aspects.

[0050] According to the twenty-first aspect, a homogeneous solid electrolyte membrane can be manufactured.

[0051] Below, with reference to the attached Figure 1 The embodiments of the present application will be described below.

[0052] The inventor's perspective

[0053] In the field of secondary batteries, which demand higher energy density and larger capacity, organic electrolytes—electrolyte salts dissolved in organic solvents—have been the mainstream. However, secondary batteries using organic electrolytes have been criticized for concerns about leakage and the potential for increased heat generation in the event of a short circuit.

[0054] Meanwhile, all-solid-state secondary batteries, which use inorganic solid electrolytes instead of organic electrolytes, are attracting attention. All-solid-state secondary batteries are leak-proof. Since inorganic solid electrolytes are non-flammable, they are expected to suppress heat generation during short circuits and other events.

[0055] As inorganic solid electrolytes used in all-solid-state secondary batteries, sulfide-based solid electrolytes containing sulfur as the main component and oxide-based solid electrolytes containing metal oxides as the main component are known. However, sulfide-based solid electrolytes sometimes produce toxic hydrogen sulfide when reacting with water. Oxide-based solid electrolytes have low ionic conductivity. Therefore, there is a desire to develop new solid electrolyte materials with excellent ionic conductivity.

[0056] As a new type of solid electrolyte material, for example, Patent Document 2 discloses a solid electrolyte material containing lithium, yttrium, and at least one halogen element.

[0057] To practically implement all-solid-state secondary batteries using ionically bonded solid electrolyte materials, it is necessary to prepare a fluid composition containing the ionically bonded solid electrolyte material. Furthermore, a technique is required to apply the fluid composition to the surface of an electrode or current collector to form a solid electrolyte component.

[0058] In order to prepare a fluid composition, it is necessary to mix an ionically bonded solid electrolyte material with an organic solvent. However, when an organic solvent is mixed with an ionically bonded solid electrolyte material, the lithium ion conductivity of the ionically bonded solid electrolyte material may decrease depending on the type of organic solvent. Alternatively, when an organic solvent is mixed with an ionically bonded solid electrolyte material, the dispersion stability of the ionically bonded solid electrolyte material may decrease depending on the type of organic solvent.

[0059] Based on the above considerations, the composition of this application was obtained.

[0060] According to the present application, solidification or sedimentation of a solid electrolyte material can be suppressed. As a result, a solid electrolyte composition having excellent dispersion stability can be provided. Furthermore, such a solid electrolyte composition can suppress a decrease in ion conductivity.

[0061] (Implementation 1)

[0062] In the first embodiment, the solid electrolyte composition includes an ionically bondable solid electrolyte material and an organic solvent.

[0063] There are no particular limitations on the solid electrolyte material having ionic bonding properties, as long as it is a solid electrolyte material having ionic bonding properties and ion conductivity. Generally speaking, a bond between atoms with a large difference in electronegativity is called an ionic bond. For example, metal elements have a small electronegativity. Non-metallic elements have a large electronegativity. For example, a solid electrolyte material having ionic bonding properties can refer to a solid electrolyte material having a bond between a metal element other than lithium and a non-metallic element. For example, a solid electrolyte material having ionic bonding properties does not contain sulfur.

[0064] The organic solvent includes a compound having a halogen group, and at least one selected from a compound having an ether group and a hydrocarbon. According to this composition, the solid electrolyte material having ionic bonding can be easily dispersed in the organic solvent, and the viscosity of the solid electrolyte composition can be appropriately adjusted. For example, by including a compound having a halogen group in the organic solvent, the solid electrolyte material having ionic bonding can be easily dispersed, and thus a solid electrolyte composition with excellent dispersibility can be obtained. For example, by including at least one selected from a compound having an ether group and a hydrocarbon in the organic solvent, the interaction between the solid electrolyte materials having ionic bonding can be appropriately adjusted. As a result, the viscosity of the solid electrolyte composition can be appropriately adjusted.

[0065] The compound having a halogen group may be one in which the portion other than the halogen group is composed solely of carbon and hydrogen. That is, the compound having a halogen group may be a compound obtained by replacing at least one hydrogen atom contained in a hydrocarbon with a halogen group. Examples of the halogen group include F, Cl, Br, and I. As the halogen group, at least one selected from F, Cl, Br, and I may be used, or a plurality of them may be used. From the perspective of boiling point or drying properties, the halogen group may be a chlorine group. The compound having a halogen group may have high polarity. By using a compound having a halogen group, a solid electrolyte material having ionic bonding properties can be easily dispersed, thereby obtaining a solid electrolyte composition with excellent dispersibility. As a result, the solid electrolyte composition can form a more dense solid electrolyte component having excellent lithium ion conductivity.

[0066] The number of carbon atoms in the halogenated compound is not particularly limited and may be 7 or more. Thus, the halogenated compound is difficult to volatilize, and thus a solid electrolyte composition can be stably manufactured. Furthermore, the halogenated compound may have a large molecular weight. That is, the halogenated compound may have a high boiling point.

[0067] The compound having a halogen group may have a ring structure. The compound having a halogen group may have an aromatic ring. The ring structure may be an alicyclic hydrocarbon or an aromatic hydrocarbon. The ring structure may be monocyclic or polycyclic. The halogen group-containing compound having a ring structure allows the solid electrolyte material having ionic bonding to be easily dispersed in the halogen group-containing compound. These compounds can particularly easily disperse halide solid electrolyte materials. The halogen group-containing compound may include an aromatic hydrocarbon. The halogen group-containing compound may also be an aromatic compound.

[0068] The compound having a halogen group may have only a halogen group as a functional group. In this case, the number of halogen groups contained in the compound having a halogen group is not particularly limited. As the halogen group, at least one selected from F, Cl, Br and I may be used, or a plurality of them may be used. By using such a compound, a solid electrolyte material having ionic bonding properties can be easily dispersed in the solid electrolyte composition. Therefore, a solid electrolyte composition having excellent suspension stability of the solid electrolyte material can be obtained. As a result, the solid electrolyte composition can form a solid electrolyte component having excellent lithium ion conductivity and being more dense. By using such a compound, the solid electrolyte composition can, for example, easily form a dense solid electrolyte membrane with fewer pinholes, unevenness, etc.

[0069] As described above, the compound having a halogen group may be a compound in which at least one hydrogen atom contained in a hydrocarbon is replaced with a halogen group. That is, the compound having a halogen group may be a halogenated hydrocarbon. The compound having a halogen group may be a compound in which all hydrogen atoms contained in a hydrocarbon are replaced with halogen atoms. By using a halogenated hydrocarbon, a solid electrolyte material having ionic bonding properties can be easily dispersed in the solid electrolyte composition. Therefore, a solid electrolyte composition having excellent suspension stability of the solid electrolyte material can be obtained. As a result, the solid electrolyte composition can form a solid electrolyte component having excellent lithium ion conductivity and being more dense. By using a halogenated hydrocarbon, the solid electrolyte composition can, for example, easily form a dense solid electrolyte membrane with fewer pinholes, unevenness, etc.

[0070] Hydrocarbons are compounds composed solely of carbon and hydrogen. Hydrocarbons can be either saturated or unsaturated. They can be straight-chain or branched. The number of carbon atoms in a hydrocarbon is not particularly limited and can be seven or more.

[0071] The hydrocarbon may have a ring structure. The hydrocarbon may have an aromatic ring. The ring structure may be an alicyclic hydrocarbon or an aromatic hydrocarbon. The ring structure may be monocyclic or polycyclic. The hydrocarbon having a ring structure allows the ionically bonded solid electrolyte material to be easily dispersed in an organic solvent. These compounds can particularly easily disperse halide solid electrolyte materials. From the perspective of improving the suspension stability of the ionically bonded solid electrolyte material in the solid electrolyte composition, the hydrocarbon may include an aromatic hydrocarbon. The hydrocarbon may be an aromatic hydrocarbon.

[0072] The portion of the compound having an ether group other than the ether group may be composed solely of carbon and hydrogen. That is, the compound having an ether group may be a hydrocarbon containing an ether bond. In this case, the hydrocarbon may be a saturated hydrocarbon or an unsaturated hydrocarbon. The hydrocarbon may be linear or branched. The number of carbon atoms contained in the hydrocarbon is not particularly limited and may be 7 or more.

[0073] The compound having an ether group may have a ring structure. That is, the hydrocarbon group contained in the compound having an ether group may have a ring structure. The compound having an ether group may have an aromatic ring. The ring structure may be an alicyclic hydrocarbon or an aromatic hydrocarbon. The ring structure may be a monocyclic or a polycyclic. By having a ring structure in the hydrocarbon group, the solid electrolyte material having ionic bonding properties can be easily dispersed in an organic solvent. These compounds can especially easily disperse halide solid electrolyte materials. From the perspective of improving the suspension stability of the solid electrolyte material having ionic bonding properties in the solid electrolyte composition, the hydrocarbon group may contain an aromatic hydrocarbon. The hydrocarbon group may be an aromatic hydrocarbon.

[0074] From the viewpoint of improving the suspension stability of the solid electrolyte material having ionic bonding, the organic solvent may further contain a ring structure. The organic solvent may further contain an aromatic compound.

[0075] More specifically, the halogen-containing compound can include at least one selected from 1,2,4-trichlorobenzene, chlorobenzene, 2,4-dichlorotoluene, o-chlorotoluene, 1,3-dichlorobenzene, p-chlorotoluene, 1,2-dichlorobenzene, 1,4-dichlorobutane, and 3,4-dichlorotoluene. These compounds can easily disperse ionically bonded solid electrolyte materials. These compounds can particularly easily disperse halide solid electrolyte materials.

[0076] The compound having a halogen group may include p-chlorotoluene. The compound having a halogen group may be p-chlorotoluene. These compounds can easily disperse solid electrolyte materials having ionic bonding properties. These compounds can particularly easily disperse halide solid electrolyte materials.

[0077] More specifically, the at least one selected from compounds having an ether group and hydrocarbons may include at least one selected from tetralin, ethylbenzene, mesitylene, pseudocumene, xylene, cumene, dibutyl ether, and anisole. These compounds can easily disperse solid electrolyte materials having ionic bonding properties. In particular, these compounds can easily disperse halide solid electrolyte materials. Furthermore, by using these compounds, the solid electrolyte composition can have an appropriate viscosity.

[0078] More specifically, the at least one selected from compounds having an ether group and hydrocarbons may include at least one selected from tetralin, xylene, cumene, and anisole. The at least one selected from compounds having an ether group and hydrocarbons may be at least one selected from tetralin, xylene, cumene, and anisole. These compounds can easily disperse ionically bonded solid electrolyte materials. In particular, these compounds can easily disperse halide solid electrolyte materials.

[0079] The ratio of the weight of the compound with a halogen group contained in the solid electrolyte composition to the total weight of the organic solvent can be 10% by weight or more, or 50% by weight or more. Thus, a solid electrolyte composition having excellent suspension stability of the solid electrolyte material can be obtained. The upper limit of the ratio of the weight of the compound with a halogen group contained in the solid electrolyte composition to the total weight of the organic solvent is not particularly limited. The upper limit of the ratio of the weight of the compound with a halogen group contained in the solid electrolyte composition to the total weight of the organic solvent can be 99% by weight. The calculation of the ratio of the weight of the compound with a halogen group contained in the solid electrolyte composition to the total weight of the organic solvent can be performed, for example, using gas chromatography-mass spectrometry (GC-MS).

[0080] The boiling point of the organic solvent is not particularly limited and may be 100°C or higher, 130°C or higher, or 200°C or higher. The upper limit of the boiling point of the organic solvent is not particularly limited. The upper limit of the boiling point of the organic solvent may be 250°C. The organic solvent may be any liquid capable of dispersing the ionically bonded solid electrolyte material; the ionically bonded solid electrolyte material may not be completely dissolved in the organic solvent.

[0081] The above configuration provides a solid electrolyte composition that suppresses a decrease in ionic conductivity and exhibits excellent suspension stability of the solid electrolyte material. Specifically, by drying a solid electrolyte composition comprising an ionically bonded solid electrolyte material and an organic solvent to remove the organic solvent, a solid electrolyte component with high ionic conductivity can be obtained. The solid electrolyte component may be a solid electrolyte membrane or an active material membrane.

[0082] The solid electrolyte material having ionic bonding properties may have lithium ion conductivity, for example.

[0083] The solid electrolyte material having ionic bonding properties may contain, for example, at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb, and Sm. These elements can generate cations in water.

[0084] The solid electrolyte material having ionic bonding properties may further contain at least one selected from F, Cl, Br, and I. These elements can generate anions in water.

[0085] The solid electrolyte material having ion bonding properties may contain Li, at least one selected from Gd, Ca, Zr, and Y, and at least one selected from F, Cl, Br, and I.

[0086] The solid electrolyte material having ion bonding properties may further contain Li, Y, and at least one selected from F, Cl, Br, and I.

[0087] With the above-described configuration, the solid electrolyte composition can further suppress a decrease in lithium ion conductivity, thereby enabling the production of a solid electrolyte component having higher lithium ion conductivity.

[0088] More specifically, the solid electrolyte material having ionic bonding properties may further include at least one selected from the group consisting of a material containing Li, Y, Cl, and Br, a material containing Li, Ca, Y, Gd, Cl, and Br, and a material containing Li, Zr, Y, and Cl. The solid electrolyte material having ionic bonding properties may further include a material containing Li, Y, Cl, and Br, a material containing Li, Ca, Y, Gd, Cl, and Br, or a material containing Li, Zr, Y, and Cl.

[0089] Specifically, the solid electrolyte material having ionic bonding may include a material selected from Li3YBr2Cl4, Li 2.8 Ca 0.1 Y 0.5 Gd 0.5 Br2Cl4 and Li 2.5 Y 0.5 Zr 0.5 At least one of Cl6. The solid electrolyte material with ionic bonding can be Li3YBr2Cl4, Li 2.8 Ca 0.1 Y 0.5 Gd 0.5 Br2Cl4, or Li 2.5 Y 0.5 Zr 0.5 Cl6. These ionically bonded solid electrolyte materials have high ionic conductivity. By using these ionically bonded solid electrolyte materials, all-solid-state batteries can exhibit excellent charge and discharge efficiency.

[0090] The solid electrolyte material having ionic bonding properties may be a material consisting essentially only of Li, at least one selected from Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb, and Sm, and at least one selected from F, Cl, Br, and I. With this composition, the solid electrolyte composition can further suppress a decrease in lithium ion conductivity. This allows for the manufacture of a solid electrolyte component having more reliably excellent lithium ion conductivity.

[0091] In this application, the phrase "consisting essentially only of Li, at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb, and Sm, and at least one selected from the group consisting of F, Cl, Br, and I" means "excluding unavoidable impurities and the like that may be inadvertently mixed, the composition contains only Li, at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb, and Sm, and at least one selected from the group consisting of F, Cl, Br, and I." Therefore, for example, the phrase "consisting essentially only of Li, Y, Cl, and Br" means "excluding unavoidable impurities and the like that may be inadvertently mixed, the composition contains only Li, Y, Cl, and Br." Hereinafter, the same expressions have the same meaning. An example of an unavoidable impurity is oxygen.

[0092] The solid electrolyte material having ionic bonding properties may be a material consisting essentially only of Li, Y, Cl, and Br. The solid electrolyte material having ionic bonding properties may be a material consisting essentially only of Li, Ca, Y, Gd, Cl, and Br. The solid electrolyte material having ionic bonding properties may be a material consisting essentially only of Li, Zr, Y, and Cl.

[0093] The solid electrolyte material having ionic bonding properties may also be a halide solid electrolyte material. In this application, a "halide solid electrolyte material" refers to a solid electrolyte material that contains a halogen element and does not contain sulfur. In addition, in this application, a sulfur-free solid electrolyte material refers to a solid electrolyte material represented by a composition formula that does not contain sulfur. Therefore, a solid electrolyte material containing an extremely small amount of sulfur, for example, a sulfur content of 0.1% by mass or less, is included in the sulfur-free solid electrolyte material. The halide solid electrolyte material may also contain oxygen as an anion other than the halogen element.

[0094] The halide solid electrolyte material can be represented by the following composition formula (1). In the composition formula (1), α, β, and γ are each independently a value greater than 0. M is at least one selected from metal elements and semimetal elements other than Li. X is at least one selected from Cl, Br, and I. The halide solid electrolyte material represented by the composition formula (1) has high ion conductivity. By using the halide solid electrolyte material, an all-solid-state battery can exhibit excellent charge and discharge efficiency.

[0095] Li α M β X γ ···(1)

[0096] In the present application, the “semi-metal element” refers to at least one selected from B, Si, Ge, As, Sb and Te.

[0097] In this application, "metal elements" refer to all elements included in Groups 1 to 12 of the periodic table except hydrogen, and all elements included in Groups 13 to 16 of the periodic table except B, Si, Ge, As, Sb, Te, C, N, P, O, S, and Se. In other words, "semimetallic elements" or "metallic elements" refer to a group of elements that can become cations when forming inorganic compounds with halogen elements.

[0098] In composition formula (1), M may further include Y (yttrium). That is, the halide solid electrolyte material may further include Y as the metal element M. Halide solid electrolyte materials have high ionic conductivity. By using halide solid electrolyte materials, all-solid-state batteries can exhibit excellent charge and discharge efficiency.

[0099] The halide solid electrolyte material containing Y may also be Li a Me b Y c A compound represented by the composition formula of X6. Here, a+mb+3c=6 and c>0 are satisfied. Me is at least one selected from metal elements and semimetal elements excluding Li and Y. m is the valence of Me.

[0100] Me is, for example, at least one selected from Mg, Ca, Sr, Ba, Zn, Sc, Al, Ga, Bi, Zr, Hf, Ti, Sn, Ta, and Nb. In this case, the ion conductivity of the halide solid electrolyte material can be further improved.

[0101] The halide solid electrolyte material may also be a material represented by the following composition formula (A1).

[0102] Li 6-3d Y d X6···(A1)

[0103] In the composition formula (A1), X is at least one selected from Cl, Br, and I. In the composition formula (A1), d may satisfy 0<d<2.

[0104] In the composition formula (A1), d may satisfy d = 1. That is, the halide solid electrolyte material may be a material represented by the composition formula (A2).

[0105] Li3YX6···(A2)

[0106] The halide solid electrolyte material may also be a material represented by composition formula (A3).

[0107] Li 3-3δ Y1+δ Cl6···(A3)

[0108] In composition formula (A3), δ may satisfy 0<δ≤0.15.

[0109] The halide solid electrolyte material may also be a material represented by composition formula (A4).

[0110] Li 3-3δ Y 1+δ Br6···(A4)

[0111] In composition formula (A4), δ may satisfy 0<δ≤0.25.

[0112] The halide solid electrolyte material may also be a material represented by composition formula (A5).

[0113] Li 3-3δ+a Y 1+δ-a Me a Cl 6-x-y Br x I y ···(A5)

[0114] In composition formula (A5), Me may be at least one selected from Mg, Ca, Sr, Ba, and Zn. In composition formula (A5), -1 < δ < 2, 0 < a < 3, 0 < (3 - 3δ + a), 0 < (1 + δ - a), 0 ≤ x ≤ 6, 0 ≤ y ≤ 6, and (x + y) ≤ 6 are satisfied.

[0115] The halide solid electrolyte material may also be a material represented by composition formula (A6).

[0116] Li 3-3δ Y 1+δ-a Me a Cl 6-x-y Br x I y ···(A6)

[0117] In composition formula (A6), Me may be at least one selected from Al, Sc, Ga, and Bi. In composition formula (A6), -1<δ<1, 0<a<2, 0<(1+δ-a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied.

[0118] The halide solid electrolyte material may also be a material represented by composition formula (A7).

[0119] Li 3-3δ-a Y 1+δ-a Me a Cl 6-x-y Br x I y···(A7)

[0120] In composition formula (A7), Me may be at least one selected from Zr, Hf, and Ti. In composition formula (A7), -1 < δ < 1, 0 < a < 1.5, 0 < (3 - 3 δ - a), 0 < (1 + δ - a), 0 ≤ x ≤ 6, 0 ≤ y ≤ 6, and (x + y) ≤ 6 are satisfied.

[0121] The halide solid electrolyte material may also be a material represented by composition formula (A8).

[0122] Li 3-3δ-2a Y 1+δ-a Me a Cl 6-x-y Br x I y ···(A8)

[0123] In composition formula (A8), Me may be at least one selected from Ta and Nb. In composition formula (A8), -1<δ<1, 0<a<1.2, 0<(3-3δ-2a), 0<(1+δ-a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied.

[0124] The halide solid electrolyte materials of composition formulas (A1) to (A8) have high ionic conductivity. All-solid-state batteries using the halide solid electrolyte materials of composition formulas (A1) to (A8) can exhibit excellent charge and discharge efficiency.

[0125] The shape of the ionically bonded solid electrolyte material is not particularly limited and may be in the form of particles. The average particle size of the ionically bonded solid electrolyte material is not particularly limited and may be 0.1 μm to 2 μm, or even 0.1 μm to 1 μm. This configuration reduces the surface roughness of the film when the solid electrolyte composition is applied to form a solid electrolyte component. This allows for the formation of a thin film.

[0126] In this application, the average particle size of the particles is the particle size (d50) equivalent to 50% of the volume accumulation obtained from the particle size distribution measured by the laser diffraction scattering method using a volume standard. The particle size distribution can also be measured using an image analyzer, for example. The same applies to other materials.

[0127] The solid electrolyte composition may further contain an organic binder. By containing an organic binder, the binding properties between solid electrolyte materials, the binding properties between the solid electrolyte and the electrode, or the binding properties between the solid electrolyte and the current collector can be improved.

[0128] The solid electrolyte composition includes an organic solvent. The organic solvent includes a halogen-containing compound, an ether-containing compound, and at least one selected from a hydrocarbon. Therefore, even if the solid electrolyte composition further includes an organic binder, a solid electrolyte composition having excellent suspension stability of the solid electrolyte material can be obtained.

[0129] The material of the organic binder is not particularly limited; materials commonly used as battery binders can be used. Examples of the organic binder include thermoplastic resins, rubbers, and styrene-butadiene elastomers. Examples of thermoplastic resins include acrylic resins, urethane resins, imide resins, amide resins, urea resins, and fluorine-containing resins. Examples of rubbers include styrene-butadiene rubber, butylene rubber, and isoprene rubber.

[0130] The solid electrolyte composition may further comprise an active material. The active material may be a positive electrode active material. The positive electrode active material may reversibly intercalate and deintercalate lithium ions. As the positive electrode active material, for example, LiCoO2 (lithium cobalt oxide, LCO), LiNi2O2 (lithium nickel oxide), LiNi 0.85 Co 0.1 Al 0.05 O2 (lithium nickel cobalt aluminum oxide, NCA), LiNi 0.5 Co 0.2 Mn 0.3 O2 (lithium nickel manganese cobalt oxide, NMC), LiNi 0.5 Mn 0.5 O2 (lithium manganese nickel oxide) and LiMn2O4 (lithium manganese oxide, LMO).

[0131] The shape of the active material is not particularly limited and may be in the form of particles. The average particle size of the active material is not particularly limited and may, for example, be 0.1 μm to 30 μm. The content of the active material in the solid electrolyte composition is not particularly limited. The ratio of the active material content in the solid electrolyte composition to the solid content may be 30% to 95% by weight, or 50% to 85% by weight. With this configuration, the solid electrolyte component formed on the current collector can exhibit excellent charge and discharge efficiency as a positive electrode.

[0132] (Implementation Method 2)

[0133] Hereinafter, Embodiment 2 will be described, and the same descriptions as those of Embodiment 1 will be omitted as appropriate. Figure 1 This is a flow chart showing an example of a method for producing a solid electrolyte composition.

[0134] The method for producing a solid electrolyte composition, for example, includes a step of mixing an ionically bonded solid electrolyte material with an organic solvent. The organic solvent, for example, includes a first organic solvent and a second organic solvent. The first organic solvent, for example, includes a halogen-containing compound. The second organic solvent, for example, includes at least one selected from an ether-containing compound and a hydrocarbon. The content of the ionically bonded solid electrolyte material, the first organic solvent, and the second organic solvent in the solid electrolyte composition are not particularly limited. The weight ratio of the first organic solvent to the weight of the ionically bonded solid electrolyte material can be 6.5% to 560% by weight, or 23% to 230% by weight. The weight ratio of the second organic solvent to the weight of the ionically bonded solid electrolyte material can be 0.67% to 510% by weight, or 2.3% to 210% by weight. This facilitates the dispersion of the ionically bonded solid electrolyte material, resulting in a solid electrolyte composition with excellent suspension stability. As a result, the solid electrolyte composition can form a denser solid electrolyte component with excellent lithium ion conductivity. By using such a compound, the solid electrolyte composition can easily form a dense solid electrolyte membrane with few pinholes, irregularities, etc., for example.

[0135] The method for producing a solid electrolyte composition may include steps S101 and S102. Step S101 is a step of mixing the ionically bonded solid electrolyte material of Embodiment 1 with a first organic solvent containing a compound having a halogen group. Step S102 is a step of mixing a second organic solvent containing at least one selected from a compound having an ether group and a hydrocarbon. Steps S101 and S102 may be performed sequentially.

[0136] A mixture can be obtained by mixing an ionically bonded solid electrolyte material with a first organic solvent containing a halogen compound. The mixture contains an ionically bonded solid electrolyte material and a first organic solvent containing a halogen compound. The mixture can have excellent dispersibility and stability. A solid electrolyte composition can be obtained by mixing the mixture with a second organic solvent containing at least one selected from a compound having an ether group and a hydrocarbon. This method ensures the dispersibility and stability of the solid electrolyte material and improves the fluidity of the solid electrolyte composition. This method allows the manufacture of a homogeneous solid electrolyte membrane and a more dense solid electrolyte component.

[0137] The method for mixing the ionically bonded solid electrolyte material and the first organic solvent containing the halogenated compound is not particularly limited. It suffices as long as the ionically bonded solid electrolyte material can be uniformly dispersed in the first organic solvent. Mixing can be performed using, for example, a ball mill, a bead mill, a planetary mixer, an ultrasonic mixer, a homogenizer, or an orbiting and rotating mixer.

[0138] (Implementation 3)

[0139] Hereinafter, Embodiment 3 will be described, and the same descriptions as those of Embodiments 1 and 2 will be omitted as appropriate. Figure 2 This is a flow chart showing an example of another method for producing a solid electrolyte composition.

[0140] A method for producing a solid electrolyte composition, for example, includes a step of mixing an ionically bonded solid electrolyte material, an organic solvent, and an organic binder. The organic solvent, for example, includes a first organic solvent and a second organic solvent. The first organic solvent, for example, includes a halogen-containing compound. The second organic solvent, for example, includes at least one selected from an ether-containing compound and a hydrocarbon. When the solid electrolyte composition includes an organic binder, the content of the ionically bonded solid electrolyte material, the content of the first organic solvent, the content of the second organic solvent, and the content of the organic binder are not particularly limited. The weight ratio of the first organic solvent to the weight of the ionically bonded solid electrolyte material can be 6.5% to 560% by weight, or 23% to 230% by weight. The weight ratio of the second organic solvent to the weight of the ionically bonded solid electrolyte material can be 0.67% to 510% by weight, or 2.3% to 210% by weight. The weight ratio of the organic binder to the weight of the ionically bonded solid electrolyte material can be 0.2% to 5% by weight, or 0.4% to 3% by weight. This allows the ionically bonded solid electrolyte material to be easily dispersed in the solid electrolyte composition. Therefore, a solid electrolyte composition with excellent suspension stability of the solid electrolyte material can be obtained. As a result, the solid electrolyte composition can form a denser solid electrolyte component with excellent lithium ion conductivity. By using this compound, the solid electrolyte composition can easily form a dense solid electrolyte membrane with fewer pinholes and unevenness, for example.

[0141] The method for producing a solid electrolyte composition may include steps S201, S202, and S203. Step S201 is a step of preparing a mixture of an ionically bonded solid electrolyte and a first organic solvent containing a compound having a halogen group. Step S202 is a step of mixing an organic binder and a second organic solvent containing at least one selected from a compound having an ether group and a hydrocarbon to prepare an organic binder solution. Step S203 is a step of mixing the mixture with the organic binder solution. Steps S201, S202, and S203 may be performed sequentially.

[0142] By creating a mixture of an ionically bonded solid electrolyte material and a first organic solvent containing a halogenated compound, a mixture with excellent dispersibility and stability can be produced. By mixing this mixture with an organic binder solution, the dispersibility and stability of the solid electrolyte material can be ensured, while also improving the fluidity of the solid electrolyte composition. This method can produce a solid electrolyte composition homogeneously mixed with an organic binder.

[0143] When only an organic binder is added to the mixture, or when an organic binder and a first organic solvent containing a halogen compound are mixed in the mixture, the viscosity of the mixed solution increases. As a result, the dispersion stability of the solid electrolyte material is reduced, or the formability of the solid electrolyte component is reduced. In the present application, an organic binder solution mixed with an organic binder and a second organic solvent is added to the mixture. Thus, the dispersibility and stability of the solid electrolyte material can be ensured, and the fluidity of the solid electrolyte composition can be improved. Furthermore, a solid electrolyte composition in which the organic binder is homogeneously mixed can be obtained.

[0144] The step of preparing the mixture can use the same method as in the second embodiment.

[0145] During the process of preparing the organic binder solution, the organic binder solution may be further heated to promote dissolution of the organic binder. The heating temperature is not particularly limited and can be determined by considering the boiling point of the organic solvent and the solubility of the organic binder. The heating temperature may be 40°C to 100°C.

[0146] The solid electrolyte composition may further contain at least one compound selected from a halogen-containing compound, an ether-containing compound, and a hydrocarbon. This ensures the dispersibility and stability of the solid electrolyte material while maintaining an appropriate viscosity. As a result, the solid electrolyte composition exhibits excellent formability, enabling the formation of a coating film of uniform thickness, for example.

[0147] (Implementation 4)

[0148] Hereinafter, Embodiment 4 will be described, and the same descriptions as those of Embodiments 1 to 3 will be omitted as appropriate. Figure 3 This is a flow chart showing an example of a method for producing a solid electrolyte composition.

[0149] The method for producing a solid electrolyte composition includes step S301 of removing the organic solvent from the solid electrolyte composition of the first embodiment. A solid electrolyte component refers to a component comprising an ionically bonded solid electrolyte material. Examples of the solid electrolyte component include a solid electrolyte layer comprising an ionically bonded solid electrolyte material, a solid electrolyte membrane, and an electrode layer comprising an ionically bonded solid electrolyte material.

[0150] By removing the organic solvent from a solid electrolyte composition containing an ionically bonded solid electrolyte material and an organic solvent, a homogeneous solid electrolyte membrane can be produced, for example. As a result, the solid electrolyte component can have high lithium ion conductivity.

[0151] In step S301, the organic solvent is removed from the solid electrolyte composition. The organic solvent can be removed by drying under reduced pressure. The solid electrolyte composition before the organic solvent is removed has excellent fluidity and, therefore, excellent formability, allowing for the formation of a coating film of uniform thickness. Drying this coating film can easily yield a dense solid electrolyte membrane with few pinholes, irregularities, and the like.

[0152] Reduced pressure drying refers to removing the organic solvent from the solid electrolyte composition in a pressure atmosphere lower than atmospheric pressure. The pressure atmosphere lower than atmospheric pressure can be, for example, -0.01 MPa or less in gauge pressure. During reduced pressure drying, the solid electrolyte composition or solid electrolyte component can also be heated to, for example, 50°C to 250°C. The organic solvent can also be removed by vacuum drying. Vacuum drying, for example, refers to removing the organic solvent from the solid electrolyte composition at a vapor pressure below 20°C below the boiling point of the organic solvent. The removal of the organic solvent can be confirmed, for example, by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), gas chromatography (GC) or gas chromatography mass spectrometry (GC / MS). In addition, as long as the dried solid electrolyte particles have ion conductivity, the organic solvent may not be completely removed.

[0153] Example

[0154] Hereinafter, the details of this application will be described using samples.

[0155] (Sample 1)

[0156] 2 g of powdered Li3YBr2Cl4 (hereinafter referred to as LYBC) was weighed and added to a commercially available glass sample tube. 4.4 g of o-chlorotoluene and 0.23 g of cumene were weighed and added to the sample tube. A homogenizer (manufactured by As One) was used to stir and mix to prepare a solid electrolyte composition. The weight of the solid component relative to the weight of the solid electrolyte composition was 30% by weight. The weight of o-chlorotoluene relative to the total weight of the organic solvent was 95% by weight.

[0157] The solid electrolyte composition was observed, and no separation of the solid component from the solvent was observed, indicating good dispersibility. The solid electrolyte composition was left to stand for one day and then observed, and no significant changes were observed.

[0158] (Evaluation of dispersion stability)

[0159] 2 g of the solid electrolyte composition of sample 1 was weighed and added to another sample tube. The sample tube was left to stand for 3 hours. Afterwards, the upper layer of 1 g of the solid electrolyte composition was taken out and the concentration of the solid component was measured. Similarly, the lower layer of 1 g of the solid electrolyte composition was taken out and the concentration of the solid component was measured. Furthermore, the difference between the concentration of the solid component in the upper layer and the concentration of the solid component in the lower layer was calculated. The concentration of the solid component in the upper layer of the sample tube and the concentration of the solid component in the lower layer of the sample tube were measured using a heated drying moisture meter (manufactured by A&D Company). The results are shown in Table 1.

[0160] (Sample 2)

[0161] 2 g of powdered LYBC was weighed and placed in a commercially available glass sample tube. 3.55 g of p-chlorotoluene was weighed and placed in the sample tube, and stirred and mixed with a spatula to prepare a mixture.

[0162] 2 g of hydrogenated styrene-based thermoplastic elastomer (Tuftec, manufactured by Asahi Kasei Corporation) was weighed and placed in another sample tube. 38 g of parachlorotoluene was weighed and placed in the sample tube. The mixture was stirred and dissolved on an 80°C hot plate using a magnetic stirrer to prepare a 5 wt% organic binder solution.

[0163] 1.2 g of the organic binder solution was weighed and added to the sample tube containing the mixture, and stirred and mixed in the same manner as Sample 1. 0.047 g of tetralin was also weighed and added to the sample tube, and stirred and mixed in the same manner as Sample 1 to prepare a solid electrolyte composition. The weight ratio of the solid component to the weight of the solid electrolyte composition was 30% by weight. The weight ratio of parachlorotoluene to the total weight of the organic solvent was 99% by weight.

[0164] The solid electrolyte composition was observed, and no separation of the solid component from the solvent was observed, indicating good dispersibility. The solid electrolyte composition was left to stand for one day and then observed, revealing no significant changes. Dispersion stability was evaluated using the same method as for Sample 1. The results are shown in Table 1.

[0165] (Evaluation of viscosity)

[0166] For the solid electrolyte composition of Sample 2, the viscosity was measured freshly prepared and after standing for one day. The viscosity was measured using a cone-plate viscoelasticity measuring apparatus (HAAKE MARS, manufactured by ThermoScientific). The solid electrolyte composition was stirred with a spatula before measurement. The viscosity was measured at a shear rate of 10 / s. The results are shown in Table 1.

[0167] (Sample 3)

[0168] A solid electrolyte composition was prepared by the same method as that of Sample 2 except that 3.46 g of p-chlorotoluene and 0.14 g of tetralin were weighed.

[0169] (Sample 4)

[0170] A solid electrolyte composition was prepared by the same method as that of Sample 2 except that 1.23 g of p-chlorotoluene and 2.37 g of tetralin were weighed.

[0171] (Sample 5)

[0172] A solid electrolyte composition was prepared by the same method as in Sample 2 except that 0.28 g of p-chlorotoluene and 3.32 g of tetralin were weighed.

[0173] (Sample 6)

[0174] A solid electrolyte composition was prepared by the same method as that of Sample 2 except that 0.47 g of p-chlorotoluene and 3.12 g of tetralin were weighed.

[0175] (Sample 7)

[0176] A solid electrolyte composition was prepared by the same method as in Sample 2, except that xylene was used instead of tetralin.

[0177] (Sample 8)

[0178] A solid electrolyte composition was prepared by the same method as that of Sample 3, except that xylene was used instead of tetralin.

[0179] (Sample 9)

[0180] A solid electrolyte composition was prepared by the same method as that of Sample 8, except that 2.42 g of p-chlorotoluene and 1.19 g of xylene were weighed.

[0181] (Sample 10)

[0182] A solid electrolyte composition was prepared by the same method as in Sample 2, except that anisole was used instead of tetralin.

[0183] (Sample 11)

[0184] A solid electrolyte composition was prepared by the same method as in Sample 2 except that 3.6 g of p-chlorotoluene was weighed and tetralin was not used.

[0185] Table 1 shows the measurement results of the solid content concentration and viscosity in the solid electrolyte composition of the sample.

[0186] Table 1

[0187]

[0188] The solid electrolyte compositions of Samples 1 to 10 exhibited excellent dispersion stability and excellent flow stability. On the other hand, when the solid electrolyte composition of Sample 11 was left to stand for one day and then observed, the viscosity of the solid electrolyte composition increased and the composition was in a solid state.

[0189] Industrial applicability

[0190] The solid electrolyte composition of the present application can be used, for example, in the production of an all-solid-state lithium secondary battery.

Claims

1. A solid electrolyte composition comprising an ionically bonded solid electrolyte material and an organic solvent. The organic solvent comprises a first organic solvent and a second organic solvent, The first organic solvent is a compound having a halogen group, and The second organic solvent is at least one selected from compounds having an ether group and hydrocarbons, The solid electrolyte material in a particle form is dispersed in the organic solvent, The weight ratio of the compound having a halogen group to the total weight of the organic solvent is 10% by weight or more, The solid electrolyte composition has fluidity.

2. The solid electrolyte composition according to claim 1, wherein The solid electrolyte material does not contain sulfur element. The solid electrolyte composition according to claim 1 , further comprising an organic binder.

4. The solid electrolyte composition according to claim 1, wherein The solid electrolyte material has lithium ion conductivity and includes at least one selected from Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb and Sm and at least one selected from F, Cl, Br and I.

5. The solid electrolyte composition according to claim 1, wherein The solid electrolyte material includes Li, at least one selected from Gd, Ca, Zr, and Y, and at least one selected from F, Cl, Br, and I.

6. The solid electrolyte composition according to claim 1, wherein The solid electrolyte material includes Li, Y, and at least one selected from F, Cl, Br, and I.

7. The solid electrolyte composition according to claim 5, wherein The solid electrolyte material includes at least one selected from a material containing Li, Y, Cl, and Br, a material containing Li, Ca, Y, Gd, Cl, and Br, and a material containing Li, Zr, Y, and Cl.

8. The solid electrolyte composition according to claim 7, wherein The solid electrolyte material comprises a material selected from Li3YBr2Cl4, Li 2.8 Ca 0.1 Y 0.5 Gd 0.5 Br2Cl4 and Li 2.5 Y 0.5 Zr 0.5 At least one of Cl6.

9. The solid electrolyte composition according to claim 1, wherein The solid electrolyte material is essentially composed only of Li, at least one selected from Mg, Ca, Sr, Ba, Zn, Sn, Al, Sc, Ga, Bi, Sb, Zr, Hf, Ti, Ta, Nb, W, Y, Gd, Tb and Sm, and at least one selected from F, Cl, Br and I.

10. The solid electrolyte composition according to claim 1, wherein The organic solvent contains a ring structure.

11. The solid electrolyte composition according to claim 10, wherein The organic solvent contains an aromatic compound.

12. The solid electrolyte composition according to claim 1, wherein The compound having a halogen group includes at least one selected from 1,2,4-trichlorobenzene, chlorobenzene, 2,4-dichlorotoluene, o-chlorotoluene, 1,3-dichlorobenzene, p-chlorotoluene, 1,2-dichlorobenzene, 1,4-dichlorobutane, and 3,4-dichlorotoluene.

13. The solid electrolyte composition according to claim 1, wherein The at least one selected from the compound having an ether group and the hydrocarbon includes at least one selected from tetralin, ethylbenzene, mesitylene, pseudocumene, xylene, cumene, dibutyl ether, and anisole. The solid electrolyte composition according to claim 1 , further comprising an active material.

15. A method for producing a solid electrolyte composition, which is the method for producing a solid electrolyte composition according to any one of claims 1 to 14, comprising the following step: mixing a solid electrolyte material having ionic bonding, a first organic solvent containing a compound having a halogen group, and a second organic solvent containing at least one selected from a compound having an ether group and a hydrocarbon.

16. The method for producing a solid electrolyte composition according to claim 15, wherein: A mixture including the solid electrolyte material and the first organic solvent is prepared, and then the mixture is mixed with the second organic solvent.

17. The method for producing a solid electrolyte composition according to claim 15, wherein: When the solid electrolyte material, the first organic solvent, and the second organic solvent are mixed, an organic binder is mixed together with the solid electrolyte material, the first organic solvent, and the second organic solvent.

18. The method for producing a solid electrolyte composition according to claim 16, wherein: When the mixture and the second organic solvent are mixed, the second organic solvent is mixed with an organic binder to prepare an organic binder solution, and the mixture is mixed with the organic binder solution.

19. The method for producing a solid electrolyte composition according to any one of claims 15 to 18, wherein At least one selected from a compound having a halogen group, a compound having an ether group, and a hydrocarbon is further mixed into the solid electrolyte composition obtained from the solid electrolyte material, the first organic solvent, and the second organic solvent. 20 . A method for producing a solid electrolyte component, comprising the step of removing the organic solvent from the solid electrolyte composition according to claim 1 .

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