KR20120126946A - Pretreatment method for recycling of lithium ion batteries - Google Patents

Abstract

PURPOSE: A pre-treating method of a lithium ion secondary battery is provided to collect a large amount of electrode composites comprising an active material by low cost by crushing a large amount of lithium ion secondary batteries without pre-classification. CONSTITUTION: A pre-treating method of a lithium ion secondary battery comprises: a step of crushing a lithium ion secondary battery waste to a size of 5-15 mm comprising an electrolyte, a separation membrane, an electrode composite and a current collector; a step of removing electrolyte by cleaning the crushed material by water and removing a separator by separating the crushed material by specific gravity; a step of treating the crushed material by 1-4 M of sulfuric acid solution and collecting an electrode composite by separating the electrode composite from the current collector. [Reference numerals] (AA) Process scrap; (BB) Waste lithium ion battery; (CC) Discharging(NaCl solution); (DD) Pulverizing; (EE) Magnetic sorting; (FF) Distribution; (GG) Electrode composite powder; (HH) Washing; (II) Electrolyte; (JJ) Viscosity separation; (KK) Separator(sulfuric acid); (LL) Separation; (MM) Distribution; (NN) Al, Cu foil; (OO) Electrode composite powder

Description

Pretreatment for Regeneration Process of Li-ion Battery {PRETREATMENT METHOD FOR RECYCLING OF LITHIUM ION BATTERIES}

The present invention relates to a wet pretreatment method for recycling various lithium ion battery wastes including waste lithium ion batteries and process scraps generated during the production of lithium ion batteries.

In general, a regeneration process for recovering valuable metals such as Li, Mn, Co, and Ni is performed from lithium ion battery wastes including waste lithium ion batteries and process scraps generated during the production of lithium ion batteries. Prior to the regeneration process, a pretreatment for separating the electrode complex (composite, positive electrode or negative electrode active material + conductive agent + binder) containing a large amount of valuable metal from the solid waste is essential for smooth recovery of the valuable metal.

Such pretreatment includes a step of discharging a waste lithium ion battery so that explosion or ignition due to a short circuit of the battery does not occur; Separating only an electrode (composed of an aluminum or copper current collector and an electrode composite layer formed on the current collector) through a preliminary dismantling operation in which the positive electrode, the negative electrode, the separator, and the battery case constituting the battery are separated in advance; Peeling the current collector and the electrode composite forming the electrode; And a process of classifying and sorting various solids.

First, as a kind of pretreatment, a technique of discharging a waste lithium ion battery is known, in which a technique of corroding and discharging a battery by immersing the waste battery in a 5-10% NaCl aqueous solution is known (WO2007 / 088617, China). See Patent Publication No. 101519726, and Chinese Patent Publication No. 101318712). However, although the case of the lithium ion battery is varied as aluminum, stainless steel (SUS), or plastic, conventionally, a large amount of hydrogen gas and a large amount of corrosion by proceeding in a single concentration of NaCl aqueous solution regardless of the case material There are safety-related problems such as heat generation, a large amount of corrosion products such as Al (OH) ₃ or Fe (OH) ₃ , or a battery having an SUS case is not completely discharged.

In addition, a pretreatment process for automatically or manually dismantling or separating an electrode including an electrode composite containing a large amount of valuable metals through a preliminary dismantling operation, in particular an anode, from other solids is disclosed in Japanese Patent Laid-Open No. 2005-327482, 2009-. 54595 and 2008-204755, and the Chinese Patent Publication No. 101381817, but in this case, there is a disadvantage in that it is difficult to mass-disassemble the components, even in the case of mass processing is difficult and the cost increases.

Furthermore, as a pretreatment step of separating the electrode composite and the current collector (aluminum foil for the anode and copper foil for the cathode) constituting the electrode by treating the separated electrode, Japanese Patent Application Laid-Open No. 2005-327482 is pH 1 It is disclosed that the positive electrode is immersed in a sulfuric acid solution of ˜3 for 30 to 90 minutes, but in this case, it is difficult to obtain a satisfactory peeling between the current collector and the electrode composite, and thus the electrode composite is not obtained at high recovery rate; Chinese Patent Publication No. 101381817 discloses immersing an electrode in N-methylpyrrolidone (NMP), and Japanese Patent Publication No. 2008-204755 discloses spraying an organic acid methanesulfonic acid against an electrode and then applying ultrasonic waves. The use of organic materials such as NMP and methanesulfonic acid is not environmentally desirable, and Japanese Patent Laid-Open No. 2008-204755 has the disadvantage that the cost is high due to the introduction of expensive etching equipment.

On the other hand, as part of the pretreatment process has been proposed a method for removing the electrolyte (electrolyte + LiPF ₆ ) contained in the lithium ion battery waste. For example, Japanese Patent Application Laid-Open No. 2008-204755 discloses a hole in a battery case, followed by decompression / heating at 85 ° C. for 30 minutes to volatilize dimethyl carbonate (DMC), one of the electrolyte components, into the atmosphere, and to 102, 160, and 300 ° C. By increasing the temperature step by step, the ethyl methyl carbonate (EMC, one of the electrolyte components), LiPF ₆ , separator and binder are sequentially pyrolyzed and removed. This method is energy consuming due to heat treatment and expensive heat treatment such as furnace. Equipment was absolutely necessary. In addition, Japanese Patent Laid-Open Publication No. 2009-54595 discloses a method of cleaning a electrolyte by opening a hole in a battery case and then injecting a cleaning agent. There is a problem that it is not easy to clean the injection.

International Patent Publication WO2007 / 088617 Chinese Patent Publication No. 101519726 Chinese Patent Publication No. 101318712 Japanese Patent Publication No. 2009-54595 Japanese Patent Publication No. 2005-327482 Chinese Patent Publication No. 101381817 Japanese Patent Publication No. 2008-204755

Accordingly, an object of the present invention is to safely, efficiently, economically and environmentally friendly an electrode composite including a positive electrode active material (active material) from a large amount of crushed lithium ion battery waste without prior disassembly in performing pretreatment for the regeneration process of a lithium ion battery. It is to provide a method for recovery.

To achieve these and other advantages and in accordance with the purpose of the present invention,

(1) crushing a lithium ion battery waste including an electrolyte, a separator, an electrode composite, and a current collector to a size of 5 to 15 mm;

(2) removing the electrolyte by washing the lysate with water and removing the separator by specific gravity separation of the lysate from which the electrolyte has been removed; And

(3) treating the crushed material from which the electrolyte and the separator are removed with a sulfuric acid solution of 1-4 M concentration to recover the electrode complex attached to the current collector in the crushed material by peeling it from the current collector

It provides, a method for pretreatment of a lithium ion battery regeneration process.

According to the pretreatment method of the lithium ion battery regeneration process according to the present invention, by mass crushing the lithium ion battery without prior disassembly classification, the electrode composite containing the positive electrode active material can be recovered in large quantities and at low cost.

In addition, by discharging corrosive discharge using NaCl aqueous solution of appropriate concentration according to the type of waste battery, intense hydrogen gas generation or undischarged cells are suppressed, and safe discharge is possible, and generation of Al (OH) ₃ and Fe (OH) ₃ is minimized. It is advantageous in operation. Furthermore, lithium ion can be separated and separated from the current collector with a high stripping rate of 99% or more while suppressing the elution of aluminum and copper through sulfuric acid as much as possible. Valuable metals or metal salts with stable purity can be recovered from the cell in a safe and efficient manner.

In addition, the method of the present invention has the advantage that it is possible to simply remove the electrolyte contained in the waste battery eco-friendly through water washing.

1 is a schematic flow diagram of a lithium ion battery waste wet pretreatment process according to one embodiment of the invention.

The pretreatment method of the lithium ion battery regeneration process of the present invention is to separate the electrode complex in the waste prior to the regeneration process for recovering valuable metals from various types of lithium ion battery waste including the electrolyte, separator, electrode composite and current collector As a giving,

(1) crushing the lithium ion battery waste into a size of 5 to 15 mm;

(2) removing the electrolyte by washing the lysate with water and removing the separator by specific gravity separation of the lysate from which the electrolyte has been removed; And

(3) treating the crushed material from which the electrolyte and the separator are removed with a sulfuric acid solution having a concentration of 1 to 4 M, and recovering the electrode complex adhered to the current collector from the crushed material with the current collector.

Lithium ion battery wastes to be covered by the present invention include not only waste lithium ion batteries but also process scraps generated during the production of lithium ion batteries.

In addition, the pretreatment method of the present invention may include various treatment steps before and after the steps (1) to (3), preferably, prior to crushing of step (1), waste lithium ions in the waste of lithium ion batteries The cells can be corroded and discharged by treatment with an aqueous solution of sodium chloride (NaCl) at a concentration of 0.5-10%; After the crushing of step (1) and prior to removing the electrolyte of step (2), if the lithium ion battery waste further contains stainless steel (SUS), the crushed material is removed from the crushed material by magnetic separation. The electrode composite powder can be separated out first by classification (primary classification).

Hereinafter, a preferred wet pretreatment method according to the present invention will be described by dividing step by step with reference to FIG.

(a) discharging step

Waste lithium ion batteries among various lithium ion battery wastes are treated with a 0.5 ~ 10% NaCl aqueous solution to corrode and discharged to a safe state in the air.

In the case of corrosive discharge of the waste battery, it is preferable to appropriately adjust the concentration and treatment time of the NaCl aqueous solution according to the type of waste battery in order to minimize the generation of hydrogen gas and the amount of precipitation of hydroxides.

Specifically,

i) Lithium-ion battery containing aluminum casing is discharged by corrosion of 12 ~ 36 hours at room temperature with NaCl aqueous solution of 0.5 ~ 4% concentration, more preferably 22 ~ 26 hours at room temperature with aqueous NaCl solution of 0.7 ~ 1% concentration. Can be;

ii) The lithium ion battery including the stainless steel case (SUS) is 12 to 36 hours at room temperature with an aqueous NaCl solution of 6 to 10% concentration, more preferably 22 to 26 hours at room temperature with an aqueous NaCl solution of 7 to 9% concentration. Can corrode and discharge;

iii) Lithium ion battery including plastic case is 36 ~ 60 hours at room temperature with 6 ~ 10% NaCl solution, more preferably 7 ~ 9, because corrosion is slow due to small charging terminal. It can be discharged by corrosion of 46 ~ 50 hours at room temperature with aqueous NaCl solution of% concentration.

In this corrosion stage

i) In a prismatic battery including an aluminum case, a case edge of a charging terminal portion is corroded with aluminum hydroxide (Al (OH) ₃ ); In a pouch cell comprising a coated aluminum case, the filling terminal portion is corroded with aluminum hydroxide;

ii) In the cylindrical battery including the SUS case, the positive electrode and the circular plastic edge surrounding the positive electrode are corroded with iron hydroxide (Fe (OH) ₃ );

iii) The cell phone battery including the plastic case is a corrosion of the charging terminal part is a complete discharge.

In particular, in order to discharge the charged lithium-ion spent battery in a high concentration of NaCl aqueous solution to corrode collectively to generate a large amount of hydrogen gas and heat, or the battery using the SUS case is not fully discharged with the conventional method that the safety problem has emerged Alternatively, the present invention enables safe 100% corrosive discharge to suppress violent hydrogen gas generation and undischarged cells by appropriately adjusting the concentration and processing time of NaCl according to the type of lithium ion battery, Al (OH) ₃ and Fe The generation of (OH) ₃ can be minimized, which is advantageous in operation.

Hydroxide (Al (OH) ₃ , Fe (OH) _3, etc.) precipitated in this step is preferably recovered by periodic filtering.

(b) shredding step

In this step, the lithium ion battery waste, which is completely discharged from the lithium ion battery, and the process scrap, is shredded to a size of 5 to 15 mm.

The crushing is preferably performed using a crusher, and the like can minimize the incorporation of Al and Cu (anode and negative electrode current collector components) into the electrode composite finally recovered by crushing in the size range. When crushing to a size smaller than 5 mm, Al and Cu are mixed in a large amount in the finally recovered electrode composite, and crushing to a size larger than 15 mm is inefficient because the processing volume (volume) in a subsequent peeling step is increased.

(c) magnetic screening stage

When the lithium ion battery waste further includes stainless steel (SUS), the stainless steel (SUS) is selectively removed from the crushed material by magnetic separation.

(d) Classification (primary classification) stage

The crushed material from which SUS is removed is separated into a large fraction of the fine electrode composite powder and other components (anode, cathode, separator) by a classification process, preferably by sieve, and the electrode composite powder is primarily separated from the crushed material. This is recovered.

(e) washing phase

The crushed material from which SUS is removed is soluble in water by immersing in water and rinsed with water (dimethyl carbonate (DMC), diethyl carbonate (DEC), ethylene carbonate (EC), etc.) and lithium salt (LiPF ₆ ). The dissolved electrolyte washing solution and other undissolved debris are separated to remove the electrolyte from the debris.

At this time, the electrolyte components are easily dissolved in water and can be easily treated with water washing (for example, water solubility of DMC 139g / L), and LiPF ₆ can be easily confirmed by removing P component in the washing solution. More than 99% removable.

The filtered and concentrated washing liquid may be classified into organic substances such as DMC, DEC, EC through fractional distillation, and Li ⁺ contained in the electrolyte may be recovered in the form of lithium carbonate salt.

(f) specific gravity separation step

In addition, the separation membrane in the crushed material is removed by specific gravity separation of the crushed material from which the electrolyte has been removed using a rinse tank provided with a water level.

(g) exfoliation step

In this step, the electrode composite adhering to the current collector is separated from the current collector by treating the crushed material from which the SUS, the electrolyte and the separator are removed with a sulfuric acid solution having a concentration of 1 to 4 M.

At this time, the crushed material may be soaked in a sulfuric acid solution of 1 to 4M concentration for 10 minutes to 5 hours, and preferably treated by immersing for 2 to 4 hours in a sulfuric acid solution of 1.5 to 2.5M concentration. When the concentration of sulfuric acid solution in the above range, a phenomenon in which the electrode composite material is easily separated from the current collector and at room temperature consisting of aluminum and copper foil (foil) Al ^{3 +} from the collector and the battery case, Cu ^{2 +} are eluted mass on which are capable of inhibiting the other hand, when the concentration of sulfuric acid solution is less than 1M, the peeling rate of the electrode assembly is reduced, and if it exceeds 4M include improvements separation rate, but increase the amount of elution of Al ^{3 +} and Cu ^{2 +} components.

Although the time to immerse the crushed sulfuric acid is inversely proportional to the temperature, it is preferable to immerse at room temperature in consideration of energy consumption.

According to the sulfuric acid treatment of the present invention, the electrode complex required for the recovery of valuable metals can be separated and separated from the current collector at a high peeling rate of 99%, and the residual separator of the battery to which the electrode composite is attached due to long-term overcharge It can be separated from the electrode composite.

Sulfuric acid process result of the invention, the lysate is ⁺ Li, Co ^{+ 3,} Ni ^{+ 2} and Mn ^{+ 2} 1 a small quantity of sulfuric acid leaching of two or more metal ions of the solution; And a solid material including an electrode composite, a current collector, an Al case, a residual separator, and the like.

Among them, the sulfuric acid solution in which the metal ion is eluted can be used in a subsequent process such as solvent extraction for recovering valuable metals.

(h) Classification (secondary classification) stage

Solids not dissolved in sulfuric acid in this step are subjected to a classification process, preferably by sieves, thereby finally recovering the electrode composite present in the solids.

At this time, by the classification, the electrode composite smaller than the mesh size is positioned in the lower part of the sieve, and the shred including the electrode composite larger than the mesh size, the residual separator, the current collector, and the Al case is left in the sieve upper part. Among these, the crushed material on the sieve upper portion can be separated into the electrode composite, the separator, the current collector and the Al case by gravity separation using a flush tank provided with a water level step.

The separated current collector can be transferred to a smelter, and the membrane can be compressed and sent to a plastic manufacturer.

As such, the electrode composite finally separated through the above steps may be used as a raw material of the leaching process during the regeneration process to recover valuable metals.

In the pretreatment method for a regeneration process of a lithium ion battery according to the present invention, the positive electrode active material is treated with an acid treatment or an organic solvent through a cumbersome process of separating and collecting the positive electrode from the contents after cutting the discharged waste battery. Unlike the conventional method of recovering, bulk destruction and electrode complex separation are possible without prior disassembly of the lithium ion battery, which makes the method very simple and enables low cost production.

In particular, in order to discharge the charged lithium-ion spent battery, by corroding collectively in a single concentration NaCl aqueous solution, a large amount of hydrogen gas and heat are generated or the battery using the SUS case is not completely discharged. In contrast, according to the method of the present invention, by appropriately adjusting the concentration and the treatment time of NaCl according to the type of lithium ion battery, a safe corrosion discharge to suppress the intense hydrogen gas generation and undischarged cells is possible, Al (OH) ₃ And the occurrence of Fe (OH) ₃ can be minimized to be operationally advantageous.

In addition, after mass crushing of the battery, the SUS (stainless steel) case is a magnet, the electrolyte and the separator are separated by water, and the water level is installed in the flush tank to remove the separator. The process is very simple and shows the same environmentally friendly effect as the method of removing electrolyte and separator dryly (Japanese Patent Laid-Open No. 2005-26088), but is much superior in terms of energy saving.

In addition, in the sulfuric acid treatment step for peeling and separating the electrode composite and the current collector, the elution of Al and Cu is suppressed as much as possible by treating with sulfuric acid at a specific concentration without prewashing using organic contaminants. In addition, the peeling rate of the electrode composite is maximized to 99%, and a stable electrode composite can be manufactured in large quantities at a relatively low price.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited by the embodiment.

Example  One: NaCl  Corrosion discharge evaluation with concentration

For each cell having an aluminum case, a stainless steel (SUS) case, or a plastic case, corrosion discharge was performed at room temperature with various concentrations of aqueous NaCl solution, and the results are shown in Table 1 below (10 for each case). Then averaged).

As can be seen from the experimental results of Table 1, in the case of the aluminum case battery NaCl concentration of 5% or more, a large amount of hydrogen gas is generated and a large amount of heat generated while the aluminum case and NaCl solution reacts violently in the initial stage of corrosion of the rechargeable battery As a result, safety problems were raised, and the amount of Al (OH) ₃ precipitate was also greatly increased.

On the other hand, the SUS case battery was much slower than the aluminum case battery, and even if the corrosion was less than 12 hours in an aqueous NaCl solution of more than 6%, there was a high possibility that it would not be fully discharged. Particularly, in case of NaCl aqueous solution of less than 6% concentration, it was required to corrode for a long time of 48 hours for complete discharge. In addition, the precipitation of Fe (OH) ₃ in the NaCl aqueous solution of 8% or less concentration was not significantly affected by the concentration of NaCl aqueous solution.

In addition, the plastic case battery is equipped with a square cell or pouch cell inside the case, so the charging terminal, which is a corrosive part, is very small, so that the corrosion process proceeds very slowly, and the battery was discharged for a long time in a higher concentration of NaCl solution.

Example  2: peeling evaluation according to sulfuric acid concentration

In order to confirm the sulfuric acid solution concentration conditions under which the current collector and the positive electrode composite are peeled off, 70 g of a waste (scrap containing the positive electrode active material), which is a waste of the lithium ion battery manufacturing process, is immersed in a sulfuric acid solution of 0.85 or 2M at room temperature for 3 hours. After peeling the aluminum current collector and the positive electrode composite, the peeling rate and the concentration of aluminum ions, which are impurities eluted in the sulfuric acid solution, were measured. Since the positive electrode composite is not peeled from the current collector by general acid immersion or etching except an organic solvent or a heating method of 80 ° C. or higher, in this embodiment, a peeling rate in a completely peeled state Is 99%).

As a result, when the concentration of sulfuric acid solution is lower than 1M, the positive electrode composite is difficult to completely peel off the aluminum current collector, while when treated with 2M sulfuric acid, it is possible to completely peel off, but there is no significant difference in aluminum elution amount. At this time, the amount of aluminum dissolution was relatively high in the edge peeling experiment, which is presumably because most of the edge surface was made of aluminum foil not coated with the positive electrode composite and reacted with sulfuric acid directly. See results).

Example  3: evaluation of electrode complex peeling according to battery type

In order to confirm the positive electrode complex peeling effect from the crushed material of various kinds of lithium ion battery waste to sulfuric acid solution, 70g of the crushed material was immersed in 2M sulfuric acid solution at room temperature for 3 hours to remove the aluminum current collector and the positive electrode composite, The peeling rate and the concentration of copper ions and aluminum ions, which are impurities eluted in the sulfuric acid solution, are shown in Table 2 below.

* Aluminum Case Battery- (1): Square Battery, Aluminum Case Battery- (2): Pouch Cell

** Jelly Roll: Cylindrical Battery without SUS Case

As can be seen from the experimental results of Table 2, even if the battery case was treated with 2M sulfuric acid without prior separation, aluminum elution did not increase significantly.

However, in the aluminum case cell- (2) and at the edge samples, the aluminum level was slightly higher, because the pouch made of coated aluminum foil had a thinner thickness than the square cell when the same weight of crushed material was added. It is interpreted that most of the edges, which are immersed in solution and also consist of exposed aluminum foil, react more with sulfuric acid than other samples.

In addition, the peeling rate of the aluminum case battery- (1), the aluminum case battery- (2) and the SUS case battery was 96%, indicating that the electrode composite of about 1% was attached to the separator due to the overcharge of these cells. This is because it is not peeled off with the current collector, and the remaining 3% is interpreted as a loss due to the adhesive tape attached during the battery manufacturing process.

As can be seen from the above results, according to the method of the present invention, a valuable metal can be removed without preliminary separation of a negative electrode using an aluminum case and a copper foil as a current collector during pretreatment of a lithium ion battery recovery process. Since it does not affect the subsequent process of extraction, the lithium secondary battery waste can be mass processed at low cost.

Example  4: according to the invention Lithium ion battery  Pretreatment of waste

After treating the lithium ion battery waste according to the pretreatment method of the present invention as shown in Figure 1 and Table 3 to recover the electrode composite in the waste and then the amount of the positive electrode active material in the electrode composite was measured, the results are shown in Table 3 Shown in

Specifically, 20% by weight of process scrap, 40% by weight of aluminum case battery, 20% by weight of SUS case battery, and 20% by weight of plastic case battery were used as the lithium ion battery waste based on the total weight. The aluminum, SUS, and plastic case cells were immersed for 24, 24, and 24 hours in aqueous NaCl solutions at concentrations of 0.8, 8, and 8%, respectively, and used for corrosion discharge.

In addition, a lithium ion battery waste was crushed to a size of 5 to 15 mm by using a crusher having a screen size of 30φ, and a sieve having a hole size of 500 μm was used in the primary and secondary classification. When peeling the electrode composite by the sulfuric acid solution, it was immersed for 3 hours at room temperature with a sulfuric acid solution of 2M concentration.

From the experimental results of Table 3, it can be seen that according to the pretreatment method of the present invention, it is possible to safely and efficiently recover the electrode composite including the positive electrode active material from the largely crushed lithium ion battery waste without prior dismantling classification.

Claims (8)

(1) crushing a lithium ion battery waste including an electrolyte, a separator, an electrode composite, and a current collector to a size of 5 to 15 mm;
(2) removing the electrolyte by washing the lysate with water and removing the separator by specific gravity separation of the lysate from which the electrolyte has been removed; And
(3) treating the crushed material from which the electrolyte and the separator are removed with a sulfuric acid solution of 1-4 M concentration to recover the electrode complex attached to the current collector in the crushed material by peeling it from the current collector
A pre-treatment method of a lithium ion battery regeneration process comprising a. The method of claim 1,
The pre-treatment method of a lithium ion battery regeneration process, characterized in that the waste of the lithium ion battery of step (1) comprises a process scrap generated during the production of the waste lithium ion battery and the lithium ion battery. The method of claim 2,
The waste lithium ion battery is treated with an aqueous solution of sodium chloride (NaCl) at a concentration of 0.5 to 10% and discharged by corrosion. The method of claim 3, wherein
The case of the waste lithium ion battery is an aluminum case, a stainless steel case or a plastic case,
The aluminum case battery was corroded discharged with an aqueous NaCl solution at a concentration of 0.5-4% for 12-36 hours; Stainless steel case cells were subjected to corrosion discharge for 12 to 36 hours with an aqueous NaCl solution at a concentration of 6-10%; Pre-treatment method of the lithium ion battery regeneration process, characterized in that the plastic case battery is corroded discharged for 36 to 60 hours with an aqueous NaCl solution of 6 to 10% concentration. The method of claim 1,
After the crushing of the step (1), and prior to removing the electrolyte of the step (2), the lithium ion battery waste further comprises stainless steel (SUS) to remove the SUS from the crushed material by magnetic separation, and then A method for pretreatment of a lithium ion battery regeneration process, characterized in that the electrode composite powder is separated firstly by classifying. The method of claim 1,
In the step (2), the crushed material from which the electrolyte is removed, the specific gravity separation using a rinse tank (water tank) is installed, characterized in that the pre-treatment method of the lithium ion battery regeneration process. The method of claim 1,
In the step (3), the treatment with sulfuric acid solution is carried out by immersing the debris in sulfuric acid solution at room temperature for 10 minutes to 5 hours, the pre-treatment method of the lithium ion battery regeneration process. The method of claim 1,
In the step (3), characterized in that the recovery of the peeled electrode composite is carried out by classification and specific gravity separation, the pre-treatment method of the lithium ion battery regeneration process.

Images