Method for separating constituent materials of a component and method for processing the component.

Abstract

A separation method according to the present invention comprises: a step for obtaining a mixture by mixing a solvent with a member that comprises an active material and a solid electrolyte; and a step for obtaining a solid component and a separated liquid by subjecting the mixture to solid-liquid separation. The solid electrolyte contains lithium (Li) element, sulfur (S) element and phosphorus (P) element. The solid electrolyte is dissolved in the solvent. It is preferable that this separation method additionally comprises a step for recovering a compound, which contains at least one of the Li element, S element and P element, from the separated liquid. It is also preferable that this separation method additionally comprises a step for recovering a carbon component by subjecting the solid component to acid dissolution.

Description

[Technical Field]

[0001] The present invention relates to a separation method for separating the constituent materials of a member having an active material and a solid electrolyte, and to a method for processing the member. [Background technology]

[0002] A lithium-ion battery has an outer casing made of a metal can or an aluminum foil laminate film, and inside it is a negative electrode material in which a negative electrode active material such as graphite is fixed to a current collector such as copper foil, and a positive electrode material in which a positive electrode active material such as lithium nickelate or lithium cobaltate is fixed to a positive electrode current collector such as aluminum foil, and these are loaded and sealed. When the electrolyte is liquid, a separator made of a porous polypropylene film or the like is placed between the positive electrode material and the negative electrode material, and an organic solvent containing a lithium salt electrolyte is sealed as the electrolyte solution. On the other hand, when the electrolyte is solid, a powder of a substance that conducts lithium ions is filled between the positive electrode material and the negative electrode material.

[0003] As mentioned above, lithium-ion batteries contain valuable components such as nickel, cobalt, copper, and lithium, and from the perspective of effective resource utilization and reduction of environmental impact, the recovery and reuse of these valuable components is being considered. For example, Patent Document 1 proposes a method for recovering lithium from lithium-ion battery waste. Patent Document 2 attempts to recover lithium from roasted lithium-ion battery scrap by leaching and neutralization / fractionation. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2019-99901 [Patent Document 2] Japanese Patent Publication No. 2019-160429 [Overview of the Initiative]

[0005] In recent years, research into solid-state batteries equipped with solid electrolytes has been active. On the other hand, research into technologies for recovering valuable metals from solid-state batteries is insufficient. Incidentally, one method for recovering valuable metals from liquid-based batteries that use an electrolyte is to burn the battery to remove the electrolyte. However, a combustion process like this one emits carbon dioxide, increasing the environmental burden. Therefore, there are challenges in applying this to solid-state batteries. Furthermore, in the case of sulfide-based solid-state batteries using sulfide solid electrolytes, there is the problem that sulfur oxides are emitted in addition to carbon dioxide during the combustion process. Moreover, burning a solid-state battery causes the phosphorus (P) element contained in the battery to form chemically stable substances such as phosphates, making it difficult to recover the P element. Patent documents 1 and 2 do not address any of these problems.

[0006] Therefore, the object of the present invention is to provide a method for effectively separating and recovering predetermined constituent materials from a component containing Li, S, and P elements while minimizing environmental impact.

[0007] The present invention relates to a separation method for separating the constituent materials of a component, A step of mixing the member having an active material and a solid electrolyte with a solvent to obtain a mixture, The process includes a step of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The solid electrolyte contains lithium (Li), sulfur (S), and phosphorus (P), The present invention provides a separation method in which the solid electrolyte dissolves in the solvent by mixing the aforementioned member with the solvent.

[0008] The present invention relates to a component having an active material and a solid electrolyte containing lithium (Li), sulfur (S), and phosphorus (P), and a solvent, and a step of mixing the two to obtain a mixture in which the solid electrolyte is dissolved in the solvent. The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process includes recovering a compound containing at least one of lithium (Li), sulfur (S), and phosphorus (P) from the separated liquid. The present invention provides a method for processing a component, wherein the solid electrolyte dissolves in the solvent by mixing the component with the solvent.

[0009] The present invention comprises the steps of mixing a member having an active material and a solid electrolyte with a solvent to obtain a mixture in which the solid electrolyte is dissolved in the solvent, The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process includes a step of dissolving the solid component in acid and recovering the carbon component which is the dissolved residue. The solid electrolyte contains lithium (Li), sulfur (S), and phosphorus (P), The present invention provides a method for processing a component, wherein the solid electrolyte dissolves in the solvent by mixing the component with the solvent.

[0010] The present invention relates to a component having an active material containing element M (where M is at least one of lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), aluminum (Al), iron (Fe), titanium (Ti), tin (Sn), niobium (Nb), silicon (Si), carbon (C), and copper (Cu)), and a solid electrolyte, and a step of mixing a solvent to obtain a mixture in which the solid electrolyte is dissolved in the solvent, The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process of obtaining a solution by dissolving the solid component in acid, The process includes recovering the M element from the aforementioned dissolution, The solid electrolyte contains lithium (Li), sulfur (S), and phosphorus (P), The present invention provides a method for processing a component, wherein the solid electrolyte dissolves in the solvent by mixing the component with the solvent. [Brief explanation of the drawing]

[0011] [Figure 1]FIG. 1 is a schematic diagram of the process in the present invention.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described based on its preferred embodiments. Both the separation method and the treatment method of the present invention are directed to members having an active material and a solid electrolyte. Unless otherwise specified, the following description is appropriately applicable to both the separation method and the treatment method of the members of the present invention (hereinafter, these are also collectively referred to as "the present method").

[0013] The active material and the solid electrolyte are typically constituent members of a solid-state battery using a solid electrolyte. The solid-state battery has a positive electrode layer, a negative electrode layer, and a solid electrolyte layer positioned therebetween, which are integrally formed. The active material is contained in at least one of the positive electrode layer and the negative electrode layer. The solid electrolyte is contained in at least the solid electrolyte layer. The solid-state battery includes, in addition to a solid-state battery that does not contain any liquid or gel material as an electrolyte, for example, an embodiment that contains a liquid or gel material of less than 50% by mass as an electrolyte.

[0014] Specific examples of the objects to be separated and treated in the present method include a positive electrode layer, a negative electrode layer, a solid electrolyte layer, and a solid-state battery including these members. In addition, for example, a member obtained by removing an electrode layer containing a solid electrolyte from a battery, a member obtained by removing one electrode layer containing an active material and the solid electrolyte layer from a solid-state battery in an integrated state or a separated state, or defective products, residual pieces, and residual chips generated in the manufacturing process of a solid-state battery, etc. are included.

[0015] One of the objects of the present method, the solid electrolyte, contains lithium (Li) element, sulfur (S) element, and phosphorus (P) element. That is, the solid electrolyte is preferably a mixture containing the above elements or a compound such as a sulfide.

[0016] Examples of the above-mentioned solid electrolyte containing sulfide include, for example, Li2S-P2S5, Li2S-P2S5-LiX (where "X" represents one or more halogen elements), Li2S-P2S5-P2O5, Li2S-Li3PO4-P2S5, Li3PS4, Li4P2S6, Li 10 GeP2S 12 、Li 3.25 Ge 0.25 P 0.75 S4, Li7P3S 11 、Li 3.25 P 0.95 S4, Li a PS b X c (X is at least one halogen element. a represents a number from 3.0 to 6.0. b represents a number from 3.5 to 4.8. c represents a number from 0.1 to 3.0.) The compounds represented are mentioned. These sulfide solid electrolytes preferably have a crystalline phase of an alluaudite-type structure in terms of enhancing the efficiency of separation and recovery. In addition to these, raw material compounds for solid electrolytes such as Li2S, P2S5, and lithium halide can be mentioned as objects for separation and treatment.

[0017] Each of the above-mentioned active materials preferably contains an M element independently. The M element in this specification represents at least one of typical metal elements such as lithium (Li) and aluminum (Al), semi-metal elements such as silicon (Si), non-metal elements such as carbon (C), and transition metal elements such as nickel (Ni), manganese (Mn), cobalt (Co), iron (Fe), titanium (Ti), tin (Sn), niobium (Nb), and copper (Cu). In a general solid battery, at least one of the above-mentioned various metals and carbon is included as a constituent element of the positive electrode active material and the conductive material contained in the positive electrode mixture constituting the positive electrode layer. Also, at least one of silicon and carbon is included as a constituent element of the negative electrode active material and the conductive material contained in the negative electrode mixture constituting the negative electrode layer. The M element in each active material may exist independently as a single substance, or as a compound such as an oxide, nitride, halide, etc., or as a mixture thereof, independently for each of the positive electrode active material and the negative electrode active material.

[0018] Since the aforementioned M element is a valuable component, it can be separated from the material and recovered for reuse. Furthermore, by adopting this method, an increase in environmental burden can be suppressed.

[0019] The detailed steps of this method are described below. A schematic of the steps of this method is shown in Figure 1. In this method, first, a mixing step is performed in which a component having an active material and a solid electrolyte is mixed with a solvent to obtain a mixture. In the mixing step, the solid electrolyte contained in the component is dissolved in the solvent by mixing the component and the solvent. At this time, other constituent materials are preferably dispersed in the solvent.

[0020] The mixing step can be carried out under conditions in which the solid electrolyte can dissolve in the solvent. The temperature conditions that can be used in the mixing step may be, for example, a non-heated state such as room temperature, or a heated state. Preferably, the temperature is below the boiling point of the solvent used. Specifically, it is preferably 0°C or higher, and more preferably 50°C or higher. Furthermore, the temperature conditions are preferably 300°C or lower, more preferably 200°C or lower, even more preferably 100°C or lower, and even more preferably 80°C or lower. By carrying out the mixing step under the above temperature conditions, the solid electrolyte can be sufficiently dissolved in the solvent.

[0021] Furthermore, the pressure conditions for the mixing process may be at atmospheric pressure or under pressurized conditions. When the mixing process is carried out under pressurized conditions, the pressure during the mixing process may be, for example, 1 MPa or more, 10 MPa or more, or 15 MPa or more. Also, the above pressure conditions may be, for example, 50 MPa or less, 40 MPa or less, or 35 MPa or less. By appropriately adjusting the pressure conditions according to the solvent and materials used, the solid electrolyte can be dissolved well in the solvent.

[0022] The mixing time in the mixing process can be appropriately changed depending on the quantity and form of the components, temperature conditions, and pressure conditions. For example, the mixing time may be 0.5 hours or more, 1 hour or more, or 3 hours or more. Alternatively, the mixing time may be 100 hours or less, 50 hours or less, or 20 hours or less. A mixing time within the above range allows the solid electrolyte to be sufficiently dissolved in the solvent.

[0023] The solvent used in the mixing process is one that dissolves the solid electrolyte. In other words, it is preferable that the solvent has sufficient solubility to dissolve the solid electrolyte. Furthermore, it is preferable that the solvent does not dissolve the active material. That is, it is preferable to use a solvent that dissolves only the solid electrolyte. By using a solvent with such properties, only the solid electrolyte can be separated effectively. In addition, because the solvent does not dissolve the active material, the solid electrolyte and the active material can be separated effectively, and each material can be recovered. Furthermore, even when the target material is one in which the state of existence and the proportion of the active material and solid electrolyte are unknown, it becomes difficult for the other material to mix with one of the separated and recovered materials, making it easier to separate and recover all the elements in the material in an independent state.

[0024] The solubility of the solvent in the solid electrolyte is preferably 1 mg / mL or more, more preferably 10 mg / mL or more, even more preferably 50 mg / mL or more, and even more preferably 100 mg / mL or more at 1 atmosphere and 20°C. While a higher solubility of the solvent in the solid electrolyte is preferable, a value of 500 mg / mL or less is practical.

[0025] When the component to be subjected to this method contains multiple types of solid electrolytes, it is preferable that the solubility of the solvent for at least one of the solid electrolytes satisfies the range described above. Furthermore, from the viewpoint of ease of separation and recovery, it is preferable that the solubility of the solvent for all solid electrolytes contained in the component satisfies the solubility described above for each. In other words, in this step, a portion of one or more solid electrolytes may dissolve, or one of the two or more solid electrolytes may dissolve completely while the other solid electrolytes do not dissolve or are partially dissolved. However, from the viewpoint of efficiency of separation and recovery, it is preferable to use a solvent that dissolves all solid electrolytes completely.

[0026] Furthermore, the solvent used in the mixing process preferably has a solubility for the active material of less than 3 mg / mL at, for example, 1 atmosphere and 20°C, more preferably less than 1 mg / mL, and even more preferably does not dissolve the active material.

[0027] The solvent described above is preferably an organic solvent. The organic solvent may be, for example, a solvent having a hydroxyl group in its chemical structure, or a solvent without a hydroxyl group. Examples of solvents having a hydroxyl group include alcohol solvents and phenol solvents. Examples of solvents without a hydroxyl group include aliphatic or aromatic hydrocarbon solvents, ester solvents, aldehyde solvents, ketone solvents, ether solvents, and other solvents containing heteroatoms in their structure. These can be used individually or in combination of two or more.

[0028] Examples of hydrocarbon solvents include linear or branched aliphatic and saturated hydrocarbons having 5 to 12 carbon atoms, such as pentane, hexane, heptane, octane, and decane, as well as aliphatic and cyclic hydrocarbons having 5 to 12 carbon atoms, such as cyclohexane, cyclopentane, cycloheptane, and cyclooctane. Examples of aromatic hydrocarbon solvents include substituted or unsubstituted aromatic hydrocarbons having 6 to 12 carbon atoms, such as benzene, toluene, xylene, halogenated benzenes, and alkylated benzenes. The alcohol solvent preferably has one or more carbon atoms, more preferably two or more, and even more preferably four or more. On the other hand, there is no particular upper limit to the number of carbon atoms, but it may be 12 or less, or 8 or less. Examples of alcohol solvents include alcohols having the above-mentioned number of carbon atoms in a straight or branched chain. Specifically, examples include methanol, ethanol, 1-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, and 2-methyl-2-propanol. Examples of ester solvents include ethyl acetate and butyl acetate. Examples of aldehyde solvents include formaldehyde and acetaldehyde. Examples of ketone solvents include acetone and methyl ethyl ketone. Examples of ether solvents include diethyl ether, diisopropyl ether, tetrahydrofuran, and dimethoxyethane. Other solvents that contain heteroatoms in their structure include, for example, acetonitrile, dimethyl sulfoxide, and dimethylformamide.

[0029] The mixing method in the mixing process may involve mixing the components and the solvent simultaneously, or adding one of the components or the solvent to the other before mixing. Furthermore, the components to be separated and processed may be mixed in a state where they have not undergone any fragmentation treatment such as crushing or shredding, or they may be mixed in the form of granular or powdery material that has been pre-fragmented, or components, regardless of whether they have been fragmented or not, may be brought into contact with the solvent and then further fragmented in the solvent. The fragmentation process is a process that reduces the dimensions of the processed material to be smaller than the dimensions of the material before processing, and can be carried out, for example, using a crushing device or a shredding device.

[0030] Of these, in the mixing step, it is preferable to bring the un-fragmented component into contact with the solvent, and then perform the fragmentation process in the solvent. By performing such a process, compared to when the component is fragmented beforehand, it is possible to increase the amount of processed material brought into the main process while increasing the surface area of ​​the component and improving the contact efficiency with the solvent. As a result, the solid electrolyte can be efficiently dissolved in the solvent, and further improvements in separation and recovery efficiency can be achieved.

[0031] The mixing of the component and the solvent is preferable in such a ratio that the concentration of the solid electrolyte in the mixture falls within a predetermined range, as this enhances separation and recovery efficiency and effectively reduces environmental impact. More specifically, the concentration of the solid electrolyte in the separated liquid obtained by solid-liquid separation of the mixture of the component and the solvent is preferably, for example, 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. Furthermore, the above concentration may be, for example, 50% by mass or less, or 30% by mass or less.

[0032] The mixture obtained through the above-described mixing process is preferably a solution in which a solid electrolyte is dissolved in a solvent, with solid components such as an active material dispersed or precipitated in it. The solution constituting the mixture contains the elements Li, S, and P that constitute the solid electrolyte, as well as other elements such as halogens as needed, in ionic form.

[0033] Next, the mixture obtained through the mixing step is subjected to a solid-liquid separation step (separation step) to obtain a solid component and a separated liquid. The method of solid-liquid separation is not particularly limited as long as it is capable of separating solids and liquids, and examples include filtration, centrifugation, and sedimentation. This allows the solid component and the separated liquid to be obtained. The solid component and the separated liquid may be stored as they are, or they may be used in subsequent recovery or processing steps as described herein.

[0034] The solid component obtained by the separation step is a solid containing the active material, and preferably contains one or more of the above-mentioned M elements. The content of M elements in the solid component is preferably 20% by mass or more, and more preferably 40% by mass or more. By having the content of M elements in the solid component within the above range, the amount of acid used in the subsequent acid dissolution can be reduced. The separated liquid obtained by the separation step is derived from a solution in which the solid electrolyte is dissolved in a solvent, and preferably contains Li, S, and P elements. Therefore, this method, which involves mixing and separation steps, allows for the efficient recovery of valuable components, including element M, for reuse or sale, without resorting to environmentally burdensome processes such as incineration. Furthermore, it enables the efficient recovery of sulfur and phosphorus, which were difficult to separate and recover using conventional technologies. As a result, it is possible to achieve effective resource utilization and a reduction in environmental impact.

[0035] The solid components obtained through the separation process preferably contain element M, and depending on the active material to be separated and processed, in addition to the metallic element component of element M, it may also contain carbon element components such as elemental carbon, such as graphite, graphite, and hard carbon. In this case, from the viewpoint of efficiently separating the metal component and the carbon component, recovering the carbon component, and facilitating the recovery of the metal component as a valuable component, it is preferable to further perform a step of acid dissolving the solid component obtained through the separation step to recover the carbon component (carbon recovery step). When the solid component contains multiple types of M elements such as metal components and carbon components, the carbon recovery step separates and recovers the carbon element from the other M elements. The carbon recovery step may be performed alone after the mixing step and the separation step, or it may be performed in any order in combination with the various suitable steps described later.

[0036] By contacting a solid component containing metal and carbon components with an acid, the metal components can be dissolved in the acid, yielding a solution in which the metal components are ionized. In the carbon recovery process, the carbon components that do not dissolve in the acid can be obtained as a dispersion in which they exist as solid dissolution residue in the solution. The dissolution residue can be recovered as a solid by, for example, performing the various solid-liquid separation methods described above. Since this carbon component is obtained with little or no alteration, it is advantageous in that it can be recovered in an environmentally friendly manner by washing and drying as needed and reusing it in other products.

[0037] The acid used for acid dissolution can be an acid capable of dissolving the metallic component of element M, such as mineral acids like hydrochloric acid, nitric acid, and sulfuric acid.

[0038] The amount of acid used for acid dissolution is preferably 1 mole or more, and more preferably 2 moles or more, per mole of M element in the solid component. Furthermore, the amount of acid used is preferably 5 moles or less, and more preferably 3 moles or less. By using an amount of acid within the above range, the metal component in the solid component is sufficiently dissolved, making it difficult for the metal component and carbon component to mix with each other, and making it easier to separate and recover each component with high purity.

[0039] The temperature and pressure conditions during acid dissolution can be the same as those for general acid dissolution.

[0040] Furthermore, it is preferable to further perform a step in which the solution obtained by acid dissolving the solid components is subjected to electrolytic treatment to recover element M, or more specifically, a step in which metal ions in the solution are reduced to recover the metal element (element M recovery step). This allows element M to be precipitated from the solution, and element M can be easily recovered as a solid with high purity, either as an element or a compound.

[0041] The M element recovery step is preferably performed using a method appropriate to the type of M element, and more preferably a method that can selectively recover the M element. Examples of methods for recovering the M element include: (i) a method of recovering the M element as a solid by subjecting the dissolution to electrolytic treatment; (ii) a method of separating and removing compounds containing elements other than the M element by pH adjustment, then adjusting the pH again to precipitate compounds containing the M element, and reducing the compounds to recover the M element as a solid; (iii) a method of transferring compounds containing the M element into an organic phase with an organic solvent, and recovering the M element by liquid extraction of the compound; and (iv) a method of recovering the M element by solid-liquid extraction of compounds containing the M element using a predetermined extractant. As extractants, for example, materials similar to those described in Japanese Patent Application Publication No. 2013-139632 can be used, but are not limited to these as long as the effects of the present invention are achieved.

[0042] The M element recovery step may be performed alone after the mixing and separation steps, or it may be performed in combination with the carbon recovery step described above. In either case, it is even more preferable to use a dissolving solution in the M element recovery step that does not contain any solids in the liquid, as this allows for the recovery of the M element with high purity and efficiency. In other words, it is preferable to dissolve the solid components in acid, and then selectively recover the M element from the acid solution obtained by separating and removing the dissolved residue, by performing at least one of the methods (i) to (iv) described above.

[0043] The separated liquid obtained through the separation process is a liquid in which no solids are present, and contains Li, S, and P elements derived from the solid electrolyte, as well as halogen elements as needed, in ionic form. From the viewpoint of efficiently and simply recovering these elements that can be used as raw materials for the solid electrolyte and further reducing the environmental burden, it is preferable to perform a compound recovery step (compound recovery step) to recover a compound containing at least one of Li, S, and P elements from the separated liquid described above. The compound recovery step may be performed alone after the mixing step and the separation step, or it may be performed in any order in combination with the carbon recovery step and M element recovery step described above.

[0044] One method for recovering compounds containing at least one of Li, S, and P elements from a separated liquid is to remove the liquid medium constituting the separated liquid. Specifically, the solvent in the separated liquid can be removed by methods such as heating and drying or vacuum drying, and the substances other than the solvent can be dried to obtain the above-mentioned compounds as solids.

[0045] The dry compounds obtained in the compound recovery process preferably contain phosphorus oxides, compounds containing two or more elements from Li, S, and P, and compounds containing halogen elements. In addition, the dry material may also contain elemental elements such as elemental sulfur, and mixtures of the above-mentioned compounds. The compounds obtained in the compound recovery process preferably contain two or more elements from Li, S, P, and halogen elements, and more preferably contain at least one of lithium sulfide, phosphorus sulfide, and lithium halide. By recovering the above compounds, they can be efficiently reused as constituent materials for solid electrolytes.

[0046] Temperature and pressure conditions in the compound recovery process can be adjusted as appropriate depending on the type of separation liquid and the type of compound.

[0047] The compounds obtained through the compound recovery process contain few impurities and the constituent elements of the solid electrolyte. Therefore, they can be used directly as a sulfide solid electrolyte and a manufacturing material for solid-state batteries, or they can be reused as a raw material for the manufacture of sulfide solid electrolytes. In particular, reusing them as a raw material for the manufacture of sulfide solid electrolytes is preferable in terms of convenience and manufacturing cost. When a compound obtained through a compound recovery process is used as a raw material for producing a sulfide solid electrolyte, for example, the compound can be mixed with other raw materials as needed to prepare a mixed powder, and then the mixed powder can be heated under the flow of a reducing gas such as hydrogen sulfide gas to produce a sulfide solid electrolyte.

[0048] The compound obtained through the compound recovery process preferably consists only of components derived from the solid electrolyte, but depending on the conditions adopted in each process, it is not prevented that the compound may inevitably contain other components other than the constituent materials of the solid electrolyte. In this case, the amount of other components contained in the compound is preferably 30% by mass or less, more preferably 15% by mass or less, and even more preferably 5% by mass or less.

[0049] Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the embodiments described above. For example, as described above, the method may consist only of the mixing step and the separation step, or it may consist of the mixing step and the separation step plus at least one of the carbon recovery step, the M element recovery step and the compound recovery step, or it may consist of all of the steps. Furthermore, the preferred steps performed after the mixing step and the separation step may be performed sequentially in any order, or simultaneously as needed. [Industrial applicability]

[0050] As described in detail above, the method of the present invention makes it possible to effectively separate predetermined constituent materials from a component containing an active material and a solid electrolyte while minimizing environmental impact.

Claims

1. A separation method for separating the constituent materials of a component, A step of mixing the member, which has an active material and a solid electrolyte and has not undergone fragmentation treatment, with a solvent to obtain a mixture, The process includes a step of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The solid electrolyte includes a sulfide solid electrolyte containing lithium (Li), sulfur (S), and phosphorus (P). The solvent comprises a linear or branched alcohol having 1 to 12 carbon atoms. A separation method comprising the step of obtaining the mixture, in which the member is subjected to a fragmentation process in the solvent, and the fragmented member and the solvent are mixed so that the solid electrolyte dissolves in the solvent.

2. The separation method according to claim 1, wherein the solvent has a solubility in the solid electrolyte of 1 mg / mL or more at 20°C.

3. The separation method according to claim 1 or 2, wherein the solvent is methanol, ethanol, 1-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, or 2-methyl-2-propanol.

4. The separation method according to any one of claims 1 to 3, wherein the active material contains element M (where M is at least one of lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), aluminum (Al), iron (Fe), titanium (Ti), niobium (Nb), silicon (Si), carbon (C), and copper (Cu)).

5. The separation method according to any one of claims 1 to 4, wherein the solid component contains element M (where M is at least one of lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), aluminum (Al), iron (Fe), titanium (Ti), tin (Sn), niobium (Nb), silicon (Si), carbon (C), and copper (Cu)).

6. The separation method according to any one of claims 1 to 5, wherein the separation liquid contains lithium (Li), sulfur (S), and phosphorus (P).

7. A step of mixing an active material, a sulfide solid electrolyte containing lithium (Li), sulfur (S), and phosphorus (P) elements, a member in a state that has not undergone fragmentation treatment, and a solvent to obtain a mixture in which the sulfide solid electrolyte is dissolved in the solvent, The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process includes recovering a compound containing at least one of lithium (Li), sulfur (S), and phosphorus (P) from the separated liquid. The solvent comprises a linear or branched alcohol having 1 to 12 carbon atoms. A method for processing a component, wherein, in the step of obtaining the mixture, the component is subjected to a fragmentation process in the solvent, and the fragmented component and the solvent are mixed so that the sulfide solid electrolyte dissolves in the solvent.

8. The processing method according to claim 7, wherein the solvent has a solubility of 1 mg / mL or more in the sulfide solid electrolyte at 20°C.

9. The processing method according to claim 7 or claim 8, wherein the solvent is methanol, ethanol, 1-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, or 2-methyl-2-propanol.

10. The treatment method according to any one of claims 7 to 9, wherein the compound is at least one of lithium sulfide, phosphorus sulfide, and lithium halide.

11. A step of mixing a member having an active material and a solid electrolyte, and in a state that has not undergone fragmentation treatment, with a solvent to obtain a mixture in which the solid electrolyte is dissolved in the solvent, The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process includes a step of dissolving the solid component in acid and recovering the carbon component which is the dissolved residue. The solid electrolyte includes a sulfide solid electrolyte containing lithium (Li), sulfur (S), and phosphorus (P). The solvent comprises a linear or branched alcohol having 1 to 12 carbon atoms. A method for processing a component, wherein, in the step of obtaining the mixture, the component is subjected to a fragmentation process in the solvent, and the fragmented component and the solvent are mixed so that the solid electrolyte dissolves in the solvent.

12. The processing method according to claim 11, wherein the solvent has a solubility in the solid electrolyte of 1 mg / mL or more at 20°C.

13. The processing method according to claim 11 or 12, wherein the solvent is methanol, ethanol, 1-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, or 2-methyl-2-propanol.

14. A step of mixing a component that has not undergone fragmentation treatment and has an active material containing element M (where M is at least one of lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), aluminum (Al), iron (Fe), titanium (Ti), tin (Sn), niobium (Nb), silicon (Si), carbon (C), and copper (Cu)), with a solid electrolyte, to obtain a mixture in which the solid electrolyte is dissolved in the solvent, The process of separating the mixture into solid and liquid components to obtain a solid component and a separated liquid, The process of obtaining a solution by dissolving the solid component in acid, The process includes recovering the M element from the aforementioned dissolution, The solid electrolyte includes a sulfide solid electrolyte containing lithium (Li), sulfur (S), and phosphorus (P). The solvent comprises a linear or branched alcohol having 1 to 12 carbon atoms. A method for processing a component, wherein, in the step of obtaining the mixture, the component is subjected to a fragmentation process in the solvent, and the fragmented component and the solvent are mixed so that the solid electrolyte dissolves in the solvent.

15. The processing method according to claim 14, further comprising the step of dissolving the solid component with acid and recovering the carbon component which is the dissolved residue.

16. The processing method according to claim 14 or 15, wherein the solvent has a solubility in the solid electrolyte of 1 mg / mL or more at 20°C.

17. The processing method according to any one of claims 14 to 16, wherein the solvent is methanol, ethanol, 1-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, or 2-methyl-2-propanol.

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