CN-121986178-A - Regenerated positive electrode material precursor, method for producing regenerated positive electrode material, and method for using regenerated positive electrode material

Abstract

A method for producing a regenerated positive electrode material precursor from a lithium ion secondary battery as an object to be treated, wherein the lithium ion secondary battery as the object to be treated is subjected to a heat treatment step, a crushing step, a classification screening step, a magnetic separation step, an acid leaching step, an iron removal step, an ion exchange step, an alkali treatment step and a cleaning step.

Inventors

• Dianse Daye
• Watari kaisuke
• KUMAGAI KOJI
• ABE ISAMU

Assignees

• 同和控股（集团）有限公司
• 国立大学法人秋田大学

Dates

Publication Date

20260505

Application Date

20241007

Priority Date

20231011

Claims (12)

1. 1. A method for producing a regenerated positive electrode material precursor from a lithium ion secondary battery as an object to be treated, the method comprising the steps of: a heat treatment step of heating a lithium ion secondary battery as the object to be treated to obtain a heat-treated object; A crushing step of crushing the heat-treated material to obtain a crushed material; a classification screening step of classifying and screening the crushed materials to obtain a fine product; an acid leaching step of acid leaching the fine-grained product to obtain an acid leaching solution; an iron removal step of adding an oxidizing agent and an alkali to the acid leaching solution to obtain an iron-removed solution; An ion exchange step of contacting the iron-removed liquid with a chelate resin to obtain an ion-exchanged liquid; an alkali treatment step of adding alkali to the ion-exchanged liquid to form a precipitate, and And a washing step of washing the precipitate with water to obtain a regenerated positive electrode material precursor.
2. 2. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein a magnetic separation step of magnetically separating the fine-particle product to obtain a magnetic attraction is performed after the classification screening step.
3. 3. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein in the acid leaching step, an acid leaching step is performed using sulfuric acid.
4. 4. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein in the iron removal step, an aqueous hydrogen peroxide solution is used as an oxidizing agent, and the oxidation-reduction potential of the acid leaching solution is set to 500 to 750mv (Ag/AgCl) to perform the iron removal step.
5. 5. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein in the ion exchange step, an ion exchange step is performed using an aminomethylphosphonic acid-based chelating resin as a chelating resin to remove aluminum ions.
6. 6. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein an analysis step of quantitatively analyzing a metal element contained in the post-ion-exchange liquid is performed, and a preparation step of preparing the post-ion-exchange liquid is performed when there is a difference between a result of the quantitative analysis of the metal element contained in the post-ion-exchange liquid and a metal composition of a target regenerated positive electrode material precursor.
7. 7. The method for producing a regenerated positive electrode material precursor according to claim 1, wherein an analysis step of quantitatively analyzing the metal element contained in the ion-exchanged liquid is performed, and when there is a difference between the result of the quantitative analysis of the metal element contained in the ion-exchanged liquid and the metal composition of the target regenerated positive electrode material precursor, an addition step of adding a metal element that is less than the metal composition of the target regenerated positive electrode material precursor is performed.
8. 8. The method for producing a regenerated positive electrode material precursor according to claim 6, wherein the aluminum content in the prepared ion-exchanged liquid is 100mg/L or less, the copper content is 1mg/L or less, and the iron content is 1mg/L or less.
9. 9. The method for producing a regenerated positive electrode material precursor according to claim 7, wherein the content of aluminum in the ion-exchanged liquid to which the metal element is added is 100mg/L or less, the content of copper is 1mg/L or less, and the content of iron is 1mg/L or less.
10. 10. A method for producing a regenerated positive electrode material, wherein a regenerated positive electrode material is obtained by adding a predetermined metal compound to the regenerated positive electrode material precursor produced by the method for producing a regenerated positive electrode material precursor according to any one of claims 1 to 9, and then calcining.
11. 11. The method for producing a regenerated positive electrode material according to claim 10, wherein the metal compound is 1 or more selected from a lithium compound, a nickel compound, a cobalt compound, and a manganese compound.
12. 12. A method for using a regenerated positive electrode material comprises the following steps: An assembling step of assembling a lithium ion secondary battery having the regenerated positive electrode material according to claim 10, and And an activation step of charging and discharging the lithium ion secondary battery assembled in the assembly step.

Description

Regenerated positive electrode material precursor, method for producing regenerated positive electrode material, and method for using regenerated positive electrode material Technical Field The present invention relates to a method for producing a regenerated positive electrode material precursor and a regenerated positive electrode material from a recovered material recovered from a lithium ion secondary battery as an object to be treated, and a method for using the regenerated positive electrode material. Background The use of lithium ion secondary batteries in the electronics field to the automotive field is rapidly expanding. In particular, in the automotive field, a sudden increase in the demand for large-sized batteries due to the increase in the capacity of units is expected as hybrid vehicle applications and/or electric vehicle applications typified by plug-in hybrid vehicles (PHEVs) and/or Battery Electric Vehicles (BEVs). The reason for the rapid increase in demand for large batteries is also that reduction of CO 2 emissions is strongly demanded in the field of transportation. As the demand for such lithium ion secondary batteries increases, the amount of lithium ion secondary batteries that terminate the lifetime of the product also increases. Hereinafter, the lithium ion secondary battery is also referred to as "LIB". On the other hand, LIB uses an expensive metal material as its positive electrode material, and thus, the reuse of a metal material from LIB, which has terminated the life of the product, is an industrially important subject. For example, in patent document 1, impurities are removed from a waste battery, a waste cathode material, or a mixture thereof, which contains a metal group consisting of at least two selected from Co, ni, and Mn and impurities, and the metal group is recovered as a mixture of the metal salts. Patent document 1 proposes to manufacture a positive electrode material using a mixture of the recovered metal salts. For example, patent document 2 filed by the present inventors discloses a regenerated positive electrode material containing at least 1 of a predetermined amount of iron, copper, and aluminum. Prior art literature Patent literature Patent document 1 Japanese patent No. 5847742 Patent document 2 Japanese patent No. 7176707 Disclosure of Invention Problems to be solved by the invention In order to reuse the metal material from the waste LIB, which has terminated the life of the product, it is required that the environmental load associated with the reuse is small and/or the cost of the reuse is low. However, for example, the method described in patent document 1 often uses a complicated separation step and a high-cost extractant, and there is a concern that the environmental load and the cost increase associated with reuse are large. For example, a battery cell of a LIB for vehicle use such as a PHEV and/or BEV needs to be firmly sealed against strong mechanical shock, all kinds of liquid immersion, fire, and high temperature. The LIB stack present within the battery cells of the LIB is typically broken down into internal components (positive, negative, separator) and an outer casing. In the method described in patent document 1, the battery cell needs to be disassembled. Therefore, in the method described in patent document 1, a safety countermeasure is required. In addition, the robust packaging of the LIB stack complicates the operation of mechanically extracting the positive electrode active material from the above-described battery cell. This situation becomes a more significant problem if the demand for large batteries increases suddenly and the throughput of waste LIB increases. In the method described in patent document 2, as a countermeasure for removing the positive electrode active material from the battery cells of the waste LIB with good time efficiency and automatically and safely, the battery cells of each waste LIB are subjected to heat treatment, as compared with the method described in patent document 1 in which the battery cells of the LIB requiring safety measures are disassembled. By this heat treatment, the LIB laminate in the battery cell is made harmless both electrically and chemically, and the risk can be significantly reduced. By adopting this method, the positive electrode active material can be extracted from the LIB laminate with good time efficiency and safety by an electro/chemical harmless method without performing complicated mechanical decomposition. The regenerated positive electrode material described in patent document 2 contains at least 1 of aluminum, copper, and iron in predetermined amounts, and therefore, it is suggested that energy density and output density can be maintained high even when charge and discharge cycles are performed, and that the regenerated LIB has sufficient added value in terms of battery performance. However, as a result of studies, the present inventors have found that the characteristics of a