Method for producing biomass-based eutectic solvent, eutectic solvent produced thereby, and method for recovering resources from waste batteries using same

Abstract

The present invention relates to a method for producing a biomass-based eutectic solvent exhibiting an excellent extraction effect on metal components from waste batteries, a eutectic solvent produced thereby, and a method for recovering resources from waste batteries using same.

Description

Method for producing a biomass-based eutectic solvent, a eutectic solvent produced thereby, and a method for recovering waste battery resources using the same

[0001] The present invention relates to a method for producing a biomass-based eutectic solvent, a eutectic solvent produced thereby, and a method for recovering waste battery resources using the same.

[0002] As the electric vehicle market expands, the volume of waste batteries, which have reached the end of their lifespan and are difficult to recycle, is also growing proportionally. Considering environmental pollution and disposal costs, these batteries are either reused or recycled. One method of recycling waste batteries is to disassemble them to extract materials such as nickel, lithium, and manganese, which are then used as raw materials for new battery materials such as cathodes. Active research is underway in this area. In particular, lithium-nickel-cobalt-manganese composite oxides are used as cathode active materials in lithium-ion secondary batteries. Therefore, the development of methods for extracting various metals from waste batteries for use in lithium-ion secondary batteries is essential.

[0003] The present invention provides a method for producing a biomass-based eutectic solvent having an excellent extraction effect on metal components from waste batteries, a eutectic solvent produced thereby, and a method for recovering waste battery resources using the same.

[0004] However, the problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

[0005] One embodiment of the present invention provides a method for producing a biomass-based eutectic solvent, comprising the steps of: producing a hydrogen bond donor compound from biomass; preparing a hydrogen bond acceptor compound; producing a mixture comprising the hydrogen bond donor compound and the hydrogen bond acceptor compound; and reacting the mixture to produce a eutectic solvent.

[0006] One embodiment of the present invention provides a eutectic solvent manufactured by the above manufacturing method.

[0007] One embodiment of the present invention provides a method for recovering resources from a waste battery using a eutectic solvent.

[0008] A method for producing a eutectic solvent according to one embodiment of the present invention can produce an eutectic solvent in an environmentally friendly manner by using a hydrogen bond donor compound derived from biomass.

[0009] A eutectic solvent according to one embodiment of the present invention can effectively recover usable metal components from discarded secondary battery waste by utilizing a strong hydrogen bond network of a hydrogen bond donor compound and a hydrogen bond acceptor compound.

[0010] A method for recovering waste battery resources according to one embodiment of the present invention can easily recover metal components, which are resources existing in waste batteries, in an environmentally friendly manner by using the eutectic solvent.

[0011] The effects of the present invention are not limited to the effects described above, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and the attached drawings.

[0012] FIG. 1 is a drawing showing a method for producing a eutectic solvent according to one embodiment of the present invention and a method for recovering waste battery resources using the eutectic solvent produced thereby.

[0013] Figure 2 is a graph of lithium extraction efficiency for LCO of eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0014] Figure 3 is a graph of cobalt extraction efficiency for LCO of eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0015] Figure 4 is a graph showing the lithium, cobalt, nickel, and manganese extraction efficiency for NMC of the eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0016] Figure 5 is a graph showing the nickel extraction efficiency for NMC of the eutectic solvents manufactured in Examples 1 to 3 of the present invention.

[0017] Figure 6 is a graph showing the extraction efficiency of lithium, cobalt, nickel, and manganese for NMC in a eutectic solvent manufactured in Example 2 of the present invention.

[0018] Throughout this specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0019] Throughout this specification, when it is said that an element is "on" another element, this includes not only cases where the element is in contact with the other element, but also cases where another element exists between the two elements.

[0020] Throughout this specification, the unit “parts by weight” may mean the weight ratio between each component.

[0021] Throughout this specification, terms containing ordinal numbers, such as "first" and "second," are used to distinguish one component from another and are not limited by the ordinal numbers. For example, within the scope of the invention, the first component may also be referred to as the second component, and similarly, the second component may be referred to as the first component.

[0022] Throughout this specification, “At least one of a, b and c” may include a, b or c alone, or a combination of two or more selected from the group consisting of a, b and c.

[0023]

[0024] Hereinafter, the present specification will be described in more detail.

[0025] One embodiment of the present invention provides a method for producing a biomass-based eutectic solvent, comprising the steps of: producing a hydrogen bond donor compound from biomass; preparing a hydrogen bond acceptor compound; producing a mixture comprising the hydrogen bond donor compound and the hydrogen bond acceptor compound; and reacting the mixture to produce a eutectic solvent.

[0026] A method for producing a eutectic solvent according to one embodiment of the present invention can produce an eutectic solvent in an environmentally friendly manner by using a hydrogen bond donor compound derived from biomass.

[0027] FIG. 1 is a drawing showing a method for producing a eutectic solvent according to one embodiment of the present invention and a method for recovering waste battery resources using the eutectic solvent produced thereby.

[0028] Referring to FIG. 1, a method for producing a eutectic solvent according to an embodiment of the present invention can produce a eutectic solvent by producing a hydrogen bond donor compound including formic acid from biomass and reacting the hydrogen bond acceptor compound including choline chloride with the hydrogen bond donor compound.

[0029] Referring to the above drawing 1, a method for manufacturing a eutectic solvent, which is an embodiment of the present invention, is specifically described.

[0030] According to one embodiment of the present invention, the biomass may include at least one of refined carbohydrates, woody biomass, herbaceous biomass, and algae. Specifically, the refined carbohydrates may include at least one of starch, glucose, cellulose, and xylose, the woody biomass may include at least one of forestry by-products, pine, and bamboo, the herbaceous biomass may include at least one of cornstalks, wheat stalks, and straw, and the algae may include at least one of green algae, red algae, and brown algae.

[0031] According to one embodiment of the present invention, the step of producing a hydrogen bond donor compound from the biomass may be performing at least one process selected from the group consisting of thermal decomposition, liquefaction, wet oxidation, catalytic oxidation, and hydrolysis oxidation. Specifically, the step of producing a hydrogen bond donor compound from the biomass may be performing a hydrolysis oxidation process. The hydrolysis oxidation process may use an acid-oxidizing homogeneous catalyst. For example, the acid-oxidizing homogeneous catalyst may include at least one of sulfuric acid, nitric acid, hydrochloric acid, citric acid, acetic acid, lactic acid, formic acid, levulinic acid, hydrogen peroxide, potassium chlorate, hypochlorite, chlorite, chlorate, DMSO (dimethyl sulfoxide), and PC (propylene carbonate).

[0032] By selecting the type of process for producing a hydrogen bond donor compound from biomass as described above, the yield of the hydrogen bond donor compound can be improved.

[0033] According to one embodiment of the present invention, the step of preparing a hydrogen bond donor compound from the biomass may be performed at a temperature of 100°C or more and 250°C or less for a time of 1 hour or more and 10 hours or less. Specifically, the hydrolysis oxidation process for preparing a hydrogen bond donor compound may be performed at a temperature of 100°C or more and 250°C or less for a time of 1 hour or more and 10 hours or less. More specifically, the temperature at which the step of preparing a hydrogen bond donor compound is performed may be 120°C or more and 230°C or less, 150°C or more and 200°C or less, 130°C or more and 220°C or less, or 160°C or more and 200°C or less. In addition, the time at which the step of preparing a hydrogen bond donor compound is performed may be 1 hour or more and 8 hours or less, 1 hour or more and 5 hours or less, or 1 hour or more and 3 hours or less. By controlling the temperature and time of the step of producing a hydrogen bond donor compound from biomass within the above-described range, the yield of the hydrogen bond donor compound produced from biomass can be improved.

[0034] According to one embodiment of the present invention, the step of preparing a hydrogen bond donor compound from the biomass may be performed at a temperature of 170°C for 3 hours to obtain a formic acid solution having a yield of 50 mol%. In this case, the biomass may be pine, and formic acid may be obtained from the pine, and further, levulinic acid and acetic acid may be obtained as process byproducts. These may be used as a hydrogen bond donor compound.

[0035] According to one embodiment of the present invention, the hydrogen bond donor compound may include at least one of levulinic acid, lactic acid, citric acid, acetic acid, formic acid, urea, and glucose. Specifically, the hydrogen bond donor compound may include at least formic acid. When the above-described compound is used as the hydrogen bond donor compound, a eutectic solvent with excellent metal extraction efficiency can be effectively prepared.

[0036] According to one embodiment of the present invention, the hydrogen bond donor compound may not contain an alcohol-based compound. That is, the hydrogen bond donor compound may be a hydrogen bond donor compound that does not contain an alcohol-based compound. Specifically, the alcohol-based compound may be a chain-type alcohol-based compound. By not using an alcohol-based compound as the hydrogen bond donor compound, the metal recovery efficiency can be effectively improved using the eutectic solvent produced.

[0037] According to one embodiment of the present invention, the hydrogen bond acceptor compound may include at least one of choline chloride, choline acetate, alanine, L-proline, lysine, and tetramethylammonium chloride. When the above-described compound is used as the hydrogen bond acceptor compound, a eutectic solvent with improved metal extraction efficiency can be effectively prepared.

[0038] According to one embodiment of the present invention, in the step of preparing a mixture including the hydrogen bond donor compound and the hydrogen bond acceptor compound, the molar ratio of the hydrogen bond donor compound and the hydrogen bond acceptor compound may be 0.1:1 to 5:1. Specifically, the molar ratio of the hydrogen bond donor compound and the hydrogen bond acceptor compound included in the mixture may be 0.5:1 to 4:1, 1:1 to 3:1, 0.5:1 to 2:1, or 2.5:1 to 5:1. When the molar ratio of the hydrogen bond donor compound and the hydrogen bond acceptor compound is within the above-mentioned range, the physical properties of the eutectic solvent can be controlled, and a eutectic solvent having excellent metal recovery efficiency from secondary battery waste can be stably prepared. When the molar ratio of the hydrogen bond donor compound and the hydrogen bond acceptor compound is within the above-mentioned range, a eutectic solvent can be stably manufactured, and the manufactured eutectic solvent can have an appropriate viscosity, so that separation and recovery of metal components from secondary battery waste can be facilitated.

[0039] According to one embodiment of the present invention, the step of preparing the eutectic solvent may be performed at a temperature of 20°C or more and 100°C or less for a time of 30 seconds or more and 10 hours or less. Specifically, the temperature at which the step of preparing the eutectic solvent is performed may be 30°C or more and 80°C or less, 45°C or more and 65°C or less, 20°C or more and 60°C or less, or 55°C or more and 100°C or less. In addition, the time for which the step of preparing the eutectic solvent is performed may be 1 minute or more and 8 hours or less, 30 minutes or more and 6 hours or less, 1 hour or more and 3 hours or less, 30 seconds or more and 1 hour or less, 30 seconds or more and 30 minutes or less, 30 seconds or more and 5 minutes or less, 1 minute or more and 3 minutes or less, 1 hour or more and 10 hours or less, 1 hour or more and 8 hours or less, 1 hour or more and 5 hours or less, or 1 hour or more and 3 hours or less. At this time, the temperature and time for preparing the eutectic solvent may be set within the above-mentioned range depending on the types of the hydrogen bond donor compound and the hydrogen bond acceptor compound.

[0040] More specifically, when the hydrogen bond donor compound includes formic acid, the reaction may be performed at a temperature of 20° C. to 30° C. for a time of 30 seconds to 1 minute. In addition, when the hydrogen bond donor compound and the hydrogen bond acceptor compound are in a solid form, the reaction may be performed at a temperature of 100° C. to 250° C. for a time of 2 hours to 10 hours. By controlling the temperature and time in the step of preparing the eutectic solvent within the above-described range, the hydrogen covalent bond between the hydrogen bond donor compound and the hydrogen bond acceptor compound can be strengthened.

[0041]

[0042] One embodiment of the present invention provides a eutectic solvent manufactured by the manufacturing method described above.

[0043] A eutectic solvent according to one embodiment of the present invention can effectively recover usable metal components from discarded secondary battery waste by utilizing a strong hydrogen bond network of a hydrogen bond donor compound and a hydrogen bond acceptor compound.

[0044] Referring to Figure 1, the manufactured eutectic solvent can be used to obtain lithium, nickel, cobalt, and manganese from the black powder of a spent battery, and nickel can then be recovered by filtering separately. Lithium, cobalt, and manganese can then be recovered and reused.

[0045] According to one embodiment of the present invention, the secondary battery waste may include at least one of LCO waste, NCM waste, and LFP waste. However, the type of secondary battery waste is not limited. Using the eutectic solvent, the metal components contained in the secondary battery waste can be easily recovered.

[0046]

[0047] One embodiment of the present invention provides a method for recovering resources from a waste battery using a eutectic solvent.

[0048] A method for recovering waste battery resources according to one embodiment of the present invention can easily recover metal components, which are resources existing in waste batteries, in an environmentally friendly manner by using the eutectic solvent.

[0049] A method for recovering waste battery resources according to one embodiment of the present invention may include a step of obtaining a metal component-containing powder from secondary battery waste; and a step of recovering the metal component by reacting a mixture including the metal component-containing powder obtained from the secondary battery waste and the eutectic solvent.

[0050] According to one embodiment of the present invention, a metal component-containing powder can be obtained from the secondary battery waste. For example, the metal component-containing powder can be obtained by a method of crushing the secondary battery waste. The size of the metal component-containing powder may be 1 um or more and 10 cm or less. When the size of the metal component-containing powder is within the above-described range, the metal recovery efficiency using a eutectic solvent can be improved.

[0051] According to one embodiment of the present invention, a mixture including a metal component-containing powder obtained from the secondary battery waste and the eutectic solvent is reacted to recover the metal component.

[0052] According to one embodiment of the present invention, a method of mixing a metal component-containing powder obtained from the secondary battery waste and the eutectic solvent may use at least one of wet milling, ultrasonic, stirring, vibration, circulation, fluidization, bubbling, vortex, drum, paddle, and mixer.

[0053] According to one embodiment of the present invention, the mixture may have a content of the metal component-containing powder of 0.5 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the eutectic solvent.

[0054] According to one embodiment of the present invention, the step of reacting the mixture may be performed at a temperature of 20°C or more and 200°C or less for a time of 1 minute or more and 24 hours or less.

[0055] According to one embodiment of the present invention, the metal component may include at least one of nickel, lithium, cobalt, and manganese. That is, the eutectic solvent may be a solvent for recovering a metal component including at least one of nickel, lithium, cobalt, and manganese.

[0056]

[0057] Hereinafter, the present invention will be described in detail using examples. However, the examples according to the present invention may be modified in various ways, and the scope of the present invention is not limited to the examples described below. The examples in this specification are provided to more fully explain the present invention to those of ordinary skill in the art.

[0058]

[0059] Preparation of eutectic solvents

[0060] Preparation of hydrogen bond donor compounds

[0061] Pine was prepared as biomass, and a mixture of citric acid, hydrogen peroxide, and DMSO was prepared as an acid-oxidizing agent (homogeneous catalyst). The mixing ratio (weight ratio) of citric acid, hydrogen peroxide, and DMSO was 2:4:1.

[0062] Afterwards, 30 g of biomass and 300 g of an acid-oxidizing agent solution were mixed and reacted at 170°C for 3 hours to obtain formic acid, levulinic acid, and acetic acid. At this time, the yield of formic acid was 50 mol%, the yield of levulinic acid was 45 mol%, and the yield of acetic acid was 5 mol%.

[0063]

[0064] Example 1 (acetic acid)

[0065] Acetic acid prepared above was prepared as a hydrogen bond donor compound, and choline chloride was prepared as a hydrogen bond acceptor compound.

[0066] Afterwards, a mixture was prepared by mixing 2.31 g of acetic acid and 5 g of choline chloride. At this time, the molar ratio of acetic acid and choline chloride contained in the mixture was 2:1.

[0067] Afterwards, the mixture was heated at a temperature of 100 ℃ for 5 minutes to prepare a eutectic solvent.

[0068]

[0069] Example 2 (formic acid)

[0070] A mixture was prepared by mixing 1.98 g of the formic acid prepared above and 5 g of choline chloride. At this time, the molar ratio of formic acid and choline chloride contained in the mixture was 2:1.

[0071] Afterwards, the mixture was stirred and reacted at about 25°C for 1 minute to prepare a eutectic solvent.

[0072]

[0073] Example 3 (levulinic acid)

[0074] Levulinic acid was prepared as described above. Then, a mixture was prepared by mixing 3.12 g of levulinic acid and 5 g of choline chloride. At this time, the molar ratio of levulinic acid to choline chloride contained in the mixture was 2:1.

[0075] Afterwards, the mixture was stirred and reacted at about 25°C for 1 minute to prepare a eutectic solvent.

[0076]

[0077] Comparative Example 1 (glycerol)

[0078] A mixture was prepared by mixing 2.84 g of glycerol as a hydrogen bond donor compound and 5 g of choline chloride as a hydrogen bond acceptor compound. The mixture was then heated at 100°C for 1 hour to prepare a eutectic solvent.

[0079]

[0080] Comparative Example 2 (ethylene glycol)

[0081] A mixture was prepared by mixing 2.35 g of ethylene glycol as a hydrogen bond donor compound and 5 g of choline chloride as a hydrogen bond acceptor compound. The mixture was then heated at 100°C for 1 hour to prepare a eutectic solvent.

[0082]

[0083] Experimental example

[0084] Lithium and cobalt production from LCO

[0085] LCO (Sigma Aldrich, LiCoO2, Lithium Cobalt Oxide) reagent was used. The eutectic solvents prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were used.

[0086] Thereafter, 5 g of the eutectic solvent prepared in Example 1 and 0.1 g of the LCO reagent were mixed and heated at temperatures of 190°C, 195°C, 200°C, 205°C, and 210°C for 24 hours. The reaction was carried out in the same manner for the eutectic solvents prepared in Examples 2 to 3 and Comparative Examples 1 and 2.

[0087]

[0088] Figure 2 is a graph of lithium extraction efficiency for LCO of eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0089] Referring to Fig. 2, when acetic acid (Example 1), formic acid (Example 2), or levulinic acid (Example 3) was used as a hydrogen bond donor compound, the lithium extraction efficiency was 60% or higher, and in particular, when formic acid was used, it was confirmed that 100% was extracted. In contrast, when glycerol (Comparative Example 1) or ethylene glycol (Comparative Example 2) was used as a hydrogen bond donor compound, the extraction efficiency was confirmed to be low at 40% or less.

[0090]

[0091] Figure 3 is a graph of cobalt extraction efficiency for LCO of eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0092] Referring to Fig. 3, when acetic acid (Example 1), formic acid (Example 2), or levulinic acid (Example 3) was used as a hydrogen bond donor compound, the cobalt extraction efficiency was 80% or higher, and in particular, 100% extraction was confirmed when formic acid was used. In contrast, when glycerol (Comparative Example 1) or ethylene glycol (Comparative Example 2) was used as a hydrogen bond donor compound, the extraction efficiency was confirmed to be low at 25% or less.

[0093]

[0094] Obtaining lithium, cobalt, nickel, and manganese from NMC reagents

[0095] NMC (Sigma Aldrich, LiNi0.33Mn0.33Co0.33O2, Nickel Manganese Cobalt) reagent was used.

[0096] Thereafter, 5 g of the eutectic solvent prepared in Example 1 and 0.1 g of NMC reagent were mixed and heated at a temperature of 150°C for 24 hours. The reaction was carried out in the same manner for the eutectic solvents prepared in Examples 2 to 3 and Comparative Examples 1 and 2.

[0097]

[0098] Figure 4 is a graph showing the lithium, cobalt, nickel, and manganese extraction efficiency for NMC of the eutectic solvents manufactured in Examples 1 to 3, Comparative Examples 1 and 2 of the present invention.

[0099] Referring to Fig. 4, when acetic acid (Example 1), formic acid (Example 2), or levulinic acid (Example 3) was used as a hydrogen bond donor compound, the lithium extraction efficiency was 50% or more, the cobalt extraction efficiency was 80% or more, and the manganese extraction efficiency was 80% or more. Meanwhile, in the case of formic acid, the extraction efficiency for lithium, cobalt, and manganese was high, but it was confirmed that it had no reactivity toward nickel. This shows that nickel can be easily separated from lithium, cobalt, and manganese using the eutectic solvent of Example 2.

[0100] Figure 5 is a graph showing the nickel extraction efficiency of NMC using eutectic solvents prepared in Examples 1 to 3 of the present invention. Specifically, Figure 5 is a graph showing the efficiency of extracting nickel obtained from NMC reagents using eutectic solvents prepared using acetic acid (Example 1), formic acid (Example 2), or levulinic acid (Example 3) as hydrogen bond donor compounds.

[0101] Referring to Figure 5, it was confirmed that the eutectic solvent of Example 2 prepared using formic acid was unable to extract nickel. Therefore, it can be seen that only the nickel component can be recovered through simple solid-liquid separation after extraction.

[0102]

[0103] Meanwhile, when glycerol (Comparative Example 1) or ethylene glycol (Comparative Example 2) was used as a hydrogen bond donor compound, it was confirmed that the extraction efficiency of lithium, cobalt, manganese, and nickel was low, with all extraction efficiencies being less than 20%.

[0104]

[0105] Obtaining lithium, cobalt, nickel, and manganese from NMC black powder

[0106] NMC's waste battery black powder (Jaeyoung Tech) was supplied and used.

[0107] Thereafter, 5 g of the eutectic solvent prepared in Example 1 and 0.1 g of black powder were mixed and heated at 90°C for 24 hours. The reaction was carried out in the same manner for the eutectic solvents prepared in Examples 2 and 3.

[0108]

[0109] Figure 6 is a graph showing the extraction efficiency of lithium, cobalt, nickel, and manganese from NMC using the eutectic solvent prepared in Example 2 of the present invention. Specifically, Figure 6 is a graph showing the extraction efficiency of nickel, lithium, cobalt, and manganese contained in NMC-series waste battery black powder using the eutectic solvent prepared in Example 2.

[0110] Referring to Fig. 6, when the eutectic solvent manufactured in Example 2 was used, the lithium extraction efficiency was 70% or more, the cobalt extraction efficiency was 90% or more, and the manganese extraction efficiency was 80% or more. Since there was no reactivity toward nickel, nickel could be easily separated separately.

Claims

1. A step of preparing a hydrogen bond donor compound from biomass; A step of preparing a hydrogen bond acceptor compound; A step of preparing a mixture comprising the hydrogen bond donor compound and the hydrogen bond acceptor compound; and A method for producing a biomass-based eutectic solvent, comprising: a step of reacting the above mixture to produce a eutectic solvent.

2. In paragraph 1, A method for producing a biomass-based eutectic solvent, wherein the biomass comprises at least one of refined carbohydrates, woody biomass, herbaceous biomass, and algae.

3. In paragraph 1, The step of preparing a hydrogen bond donor compound from the above biomass comprises: A method for producing a biomass-based eutectic solvent, comprising performing at least one process among thermal decomposition, liquefaction, wet oxidation, catalytic oxidation, and hydrolytic oxidation.

4. In paragraph 3, The step of preparing a hydrogen bond donor compound from the above biomass comprises: A method for producing a biomass-based eutectic solvent, the method being performed at a temperature of 100°C or higher and 250°C or lower for a time of 1 hour or higher and 10 hours or lower.

5. In paragraph 1, A method for producing a biomass-based eutectic solvent, wherein the hydrogen bond donor compound does not contain an alcohol-based compound.

6. In paragraph 1, A method for producing a biomass-based eutectic solvent, wherein the hydrogen bond donor compound comprises at least one of levulinic acid, lactic acid, citric acid, acetic acid, formic acid, urea, and glucose.

7. In paragraph 1, A method for producing a biomass-based eutectic solvent, wherein the hydrogen bond acceptor compound comprises at least one of choline chloride, choline acetate, alanine, L-proline, lysine, and tetramethylammonium chloride.

8. In paragraph 1, The step of preparing a mixture comprising the hydrogen bond donor compound and the hydrogen bond acceptor compound comprises: A method for producing a biomass-based eutectic solvent, wherein the molar ratio of the hydrogen bond donor compound and the hydrogen bond acceptor compound is 0.1:1 to 5:

1.

9. In paragraph 1, The step of preparing the above eutectic solvent is: A method for producing a biomass-based eutectic solvent, wherein the method is performed at a temperature of 20°C or higher and 100°C or lower for a time of 30 seconds or higher and 10 hours or lower.

10. A eutectic solvent manufactured by the manufacturing method according to Article 1.

11. A method for recovering resources from a waste battery using a eutectic solvent according to Article 10.

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