Method for recovering and reusing ternary positive electrode material

Abstract

The invention discloses a recovery and utilization method of a waste ternary positive electrode material and application of the waste ternary positive electrode material in electrochemistry. The recovery and utilization method comprises the following steps: carrying out hydrothermal reaction on the waste ternary positive electrode material and a formamide solution; then, in an inert atmosphere, roasting the carbon precursor to prepare a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material; the composite material is used for efficient electrocatalytic oxygen reduction reaction. According to the recovery method of the ternary electrode material of the waste lithium ion battery, nickel, cobalt and manganese elements can be effectively recovered, and the functional whole electrode material can be used as an oxygen reduction electrocatalyst. The recycling method provided by the invention is low in cost, convenient to operate, high in safety and beneficial to popularization and application.

Description

Technical Field

[0001] The invention relates to a lithium ion battery material recycling and reuse technology, and mainly relates to a recycling and utilization method of waste ternary positive electrode materials and their application in electrochemistry. Background Art

[0002] As the mainstream battery type today, lithium-ion batteries play an important role in electric vehicles, mobile devices, and energy storage systems. With the rapid development of electric vehicles and renewable energy, the demand for lithium-ion batteries continues to increase, but their service life is limited. Once scrapped, they will cause great pollution and threats to the environment. Therefore, how to recycle and dispose of these waste batteries has become an important topic in the field of new energy storage.

[0003] Waste lithium-ion batteries are rich in heavy metals, electrolytes, binders and other substances, which pose a potential threat to the natural environment and human health. Among them, waste ternary positive electrode materials contain a large amount of valuable metal resources, such as nickel, cobalt, manganese, etc., which far exceeds the valuable metal content of ores in nature. Therefore, the effective recycling of waste ternary positive electrode materials can not only achieve resource reuse and reduce the exploitation of natural resources, but also reduce environmental pollution, which is in line with the concept of sustainable development.

[0004] At present, the recycling methods of lithium-ion battery ternary cathode materials mainly include: physical separation method, chemical leaching method, heat treatment method, hydrometallurgical method, etc. Among them, although the chemical leaching method has a simple process, the utilization rate of metal ions is low, and the heat treatment method and hydrometallurgical method will produce toxic gas and consume a lot of energy. Based on the shortcomings of the above technologies, how to improve the utilization rate of waste ternary cathode materials without causing secondary pollution is a focus of technical research in this field. Summary of the invention

[0005] The present invention provides a method for recycling and reusing ternary positive electrode materials for lithium-ion batteries and the application of recycled materials in electrochemistry. As an example, the ternary positive electrode material waste is crushed and sieved as a doping source, and formamide is used as a carbon source. Through hydrothermal reaction, the recovery is completed to synthesize a non-precious metal nitrogen-doped carbon precursor; then, under the protection of an inert gas, the nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material is synthesized through roasting, which can be used as an efficient electrocatalyst, thereby realizing the efficient recycling of the ternary positive electrode material. The recycling and reuse method provided by the present invention is low in cost, easy to operate, and highly safe, and is conducive to popularization and application.

[0006] The present invention adopts the following technical scheme.

[0007] A method for recycling ternary positive electrode materials comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to complete the recycling of the ternary positive electrode materials.

[0008] A method for preparing a ternary positive electrode material regeneration catalyst comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to obtain a recycled ternary positive electrode material; and then roasting the recycled ternary positive electrode material to obtain a ternary positive electrode material regeneration catalyst.

[0009] A method for recycling ternary positive electrode materials comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to obtain recycled ternary positive electrode materials; then roasting the recycled ternary positive electrode materials to obtain doped carbon materials; and using the doped carbon materials as catalysts to complete the recycling of the ternary positive electrode materials.

[0010] In the present invention, the ternary cathode material includes a ternary cathode material for a lithium-ion battery; the mass ratio of the formamide to the waste ternary cathode material is (2000-50):1. Preferably, the mass ratio of the formamide to the waste ternary cathode material is (1000-200):1. Further preferably, the mass ratio of the formamide to the waste ternary cathode material is (700-300):1, such as 700:1, 600:1, 500:1, 400:1, 300:1 or any ratio within the range.

[0011] In the present invention, the reaction includes a hydrothermal reaction; preferably, the reaction temperature is 170-220°C and the reaction time is 1-24 hours. Further preferably, the reaction is a hydrothermal reaction, the reaction temperature is 180-210°C and the reaction time is 3-15 hours.

[0012] In the present invention, the reaction is carried out in the presence of a zinc compound, and the nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material is obtained by calcination. Preferably, the zinc compound includes one or more of zinc chloride, zinc oxide, zinc nitrate, zinc sulfate, and zinc acetate compounds.

[0013] In the present invention, the weight ratio of formamide to the zinc compound is 1:(100-1000); preferably, the weight ratio of formamide to the zinc compound is 1:400.

[0014] In the present invention, the calcination is carried out under the protection of an inert atmosphere; the calcination temperature is 500-1100° C. and the calcination time is 1-99 hours.

[0015] Preferably, the inert atmosphere includes helium, neon, argon, krypton or xenon atmosphere.

[0016] Preferably, the calcination temperature is 800-1100° C. and the calcination time is 1-50 hours.

[0017] More preferably, the calcination temperature is 800-1000° C. and the calcination time is 1-30 hours.

[0018] More preferably, the calcination temperature is 850-950° C., and the calcination time is 1-20 hours, preferably 1-10 hours, such as 2 hours, 3 hours, 4 hours, 5 hours or any time within the specified range.

[0019] In the present invention, the calcination is a one-step calcination, and the calcined product is washed in water, dried, and a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material is synthesized, which can be used as an efficient electrocatalyst, thereby realizing efficient recycling of the ternary positive electrode material. The recycling and reuse method provided by the present invention has low cost, convenient operation, high safety, and is conducive to popularization and application.

[0020] The present invention discloses a recycled ternary positive electrode material obtained by the above-mentioned method for recycling the ternary positive electrode material; or a ternary positive electrode material regeneration catalyst obtained by the above-mentioned method for reusing the ternary positive electrode material.

[0021] The invention discloses the application of the above-mentioned recovery of ternary positive electrode material or regeneration catalyst of ternary positive electrode material in electrochemical reaction.

[0022] As an example, the electrochemical reaction includes an electrocatalytic oxygen reaction.

[0023] The invention discloses the use of the above-mentioned recycled ternary positive electrode material or the ternary positive electrode material regeneration catalyst in the preparation of aluminum / zinc air batteries and fuel cells.

[0024] The invention discloses an electrochemical reaction method, and the used electrocatalyst comprises the above-mentioned ternary positive electrode material regeneration catalyst.

[0025] The above-mentioned ternary positive electrode material regeneration catalyst of the present invention can be used as a catalyst for electrochemical reactions as the only active ingredient, and can also be used together with other reagents as a catalyst for electrochemical reactions.

[0026] The present invention provides a method for recycling a ternary positive electrode material of a lithium ion battery, comprising the following steps: (1) Dissolving a certain amount of waste ternary cathode powder in formamide solution; (2) adding a certain amount of zinc compound to the above solution to promote the polymerization reaction of formamide; (3) reacting the above-mentioned waste ternary cathode powder / formamide solution at 170-220°C for 1-24 hours; (4) centrifuging and purifying the reaction-completed solution to obtain a precursor material; (5) The precursor material is calcined to prepare a nickel-cobalt-manganese-zinc-nitrogen doped carbon material with high electrocatalytic activity.

[0027] In the above technical solution, in step (1), the ratio of the amount of formamide used to the amount of waste ternary positive electrode material used is between 600:1 and 100:1.

[0028] In the above technical solution, the zinc compound used in step (2) includes: zinc oxide, anhydrous zinc chloride, zinc nitrate, zinc acetate, etc.

[0029] In the above technical solution, the reaction in step (3) is carried out in a hydrothermal reactor. In actual production, other suitable reactors may also be selected.

[0030] According to the above-mentioned method for recycling and reusing old ternary positive electrode materials, a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon precursor can be prepared.

[0031] In the above technical solution, in step (5), under the protection of an inert atmosphere, the reaction conditions of the calcination reaction are: temperature 700-1000°C, and insulation time 1-15 hours.

[0032] According to one embodiment of the present invention, a carbon precursor is calcined in an inert atmosphere to obtain a nickel-cobalt-manganese-zinc-nitrogen doped carbon material. The inert atmosphere is formed by helium, neon, argon, krypton or xenon.

[0033] The present invention also provides the use of the above nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material in the preparation of aluminum / zinc air batteries and fuel cells.

[0034] The present invention has the following beneficial effects: The purpose of the prior art of defect-rich nitrogen-doped carbon is to design structurally adjustable and controllable carbon defects. The disclosed scheme is through two-step calcination and acid washing, which objectively has the problem of complex preparation method, and it is not suitable for the recovery and reuse of ternary positive electrode materials; the focus of the present invention is to reuse waste, prepare it into electrocatalytic materials, realize the reuse of metal ions, reduce environmental pollution and the synthesis cost of electrocatalysts, and the catalyst also has great application prospects in energy storage.

[0035] The present invention uses waste ternary positive electrode materials as doping sources, and in the presence of zinc ions, hydrothermally reacts with a formamide solution to obtain a carbon precursor, which is then carbonized to obtain a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material, and applies it in the field of electrochemistry. The present invention has the advantages of high metal material recycling rate, low process cost, high safety, and convenience for promotion. Achieving efficient recycling of waste ternary positive electrode materials will provide important support for the sustainable development of the lithium-ion battery industry. The method for recycling and reusing waste ternary positive electrode materials for lithium-ion batteries of the present invention is simple to operate, highly safe, does not require post-processing steps, and is conducive to industrial scale-up production. At the same time, it has a wide range of applications, which is conducive to scientific research and expanded production for different catalytic and energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a scanning electron microscope photograph of NiCoMn-Zn-NC prepared in Example 1 of the present invention.

[0037] Figure 2 This is a scanning electron microscope photograph of NiCoMn-NC prepared in Example 2 of the present invention.

[0038] Figure 3 This is a scanning electron microscope photograph of Zn-NC prepared in Example 3 of the present invention.

[0039] Figure 4 X-ray diffraction patterns of Zn-NC, NiCoMn-NC and NiCoMn-Zn-NC prepared in Examples 1-3 of the present invention.

[0040] Figure 5 This is the full X-ray photoelectron spectrum of Zn-NC, NiCoMn-NC, and NiCoMn-Zn-C prepared in Examples 1-3 of the present invention.

[0041] Figure 6 Cyclic voltammetry curves for evaluating the electrochemical oxygen reduction performance of Zn-NC, NiCoMn-NC, and NiCoMn-Zn-C prepared in Examples 1-3 of the present invention.

[0042] Figure 7 Linear sweep voltammetry curves for evaluating the electrochemical oxygen reduction performance of Zn-NC, NiCoMn-NC, and NiCoMn-Zn-C prepared in Examples 1-3 of the present invention.

[0043] Figure 8 The electrode polarization curve and power curve of the NiCoMn-Zn-C aluminum-air battery prepared in Examples 1-3 of the present invention.

[0044] Fig. 9 Linear sweep voltammetry curves for evaluation of the electrochemical oxygen reduction performance of NiCoMn-Zn-C prepared with different zinc salts.

[0045] Fig.10 Linear sweep voltammetry curves for evaluating the electrochemical oxygen reduction performance of NiCoMn-Zn-C and NiCoMn-Zn-C-2.

[0046] Fig.11 Linear sweep voltammetry curves for evaluating the electrochemical oxygen reduction performance of RT-NiCoMn-Zn-NC and NiCoMn-Zn-C prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0047] The invention discloses a method for recycling and reusing waste ternary positive electrode materials of lithium ion batteries, the steps of which are as follows: using waste ternary positive electrode materials as a doping source and formamide as a carbon source, preparing a carbon precursor through a hydrothermal reaction, and then preparing a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material with high electrocatalytic activity through roasting.

[0048] Specifically, the method for recycling and reusing waste ternary positive electrode materials of lithium-ion batteries is as follows: (1) Disassembling the lithium-ion battery, collecting the ternary positive electrode material, and then grinding and sieving to obtain the powder of the waste ternary positive electrode material; (2) dissolving a certain amount of waste ternary cathode powder in formamide solution; (3) adding a certain amount of zinc compound to the above solution to promote the polymerization reaction of formamide; the zinc compound selected includes: zinc oxide, anhydrous zinc chloride, zinc nitrate, etc.; (4) reacting the above-mentioned waste ternary cathode powder / formamide solution at 170-200° C. for 3-10 hours; the reaction is carried out in a hydrothermal reactor; (5) centrifuging and purifying the completely reacted solution to obtain a nickel-cobalt-manganese-zinc-nitrogen doped carbon precursor material; (6) The precursor material is calcined to prepare a nickel-cobalt-manganese-zinc-nitrogen doped carbon material with high electrocatalytic activity.

[0049] Furthermore, the calcined product is washed in deionized water and dried to obtain a nickel-cobalt-manganese-zinc-nitrogen doped carbon material with high electrocatalytic activity.

[0050] The nickel-cobalt-manganese ternary zinc-nitrogen doped carbon material prepared by the method for recycling and reusing waste ternary positive electrode materials of the present invention has good application effects in the field of electrocatalysis, such as electrocatalytic oxygen reaction, aluminum / zinc-air battery and fuel cell. The method for recycling and reusing waste ternary positive electrode materials of lithium-ion batteries of the present invention is simple to operate, highly safe, and is conducive to industrial scale-up production. At the same time, it has a wide range of applications and is conducive to scientific research and scale-up production for different catalytic and energy storage systems.

[0051] The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0052] The specific embodiments of the present application will be described in more detail below. These embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0053] The specific reagents used in the present invention are existing products, and the specific preparation operations and performance tests are all conventional techniques.

[0054] According to the existing conventional technology, the lithium-ion battery is disassembled, the ternary positive electrode material is collected, and then ground and sieved to obtain 1-2 μm powder of the waste ternary positive electrode material, which has very poor performance and cannot measure the ORR performance. It is used in the following experiments.

[0055] The waste battery defined in the present invention refers to the battery whose performance can no longer meet the requirements of normal use of related instruments and equipment, which is common knowledge in the field. The positive electrode materials of lithium-ion batteries mainly include spinel structure LiMn2O4, olivine structure LiFePO4, layered structure LiCoO2 and LiNiO2, etc. Li[Ni 1-x-y Co x Mn y ]O2 layered metal oxide positive electrode material combines the advantages of LiCoO2, LiNiO2, and LiMn2O4, taking advantage of their strengths to improve the energy density and cycle life of positive electrode materials, reducing costs and improving safety performance, and is widely used in fields such as electric vehicles and supercomputers. The waste ternary positive electrode material selected by the present invention is Li[Ni 1-x-y Co x Mn y ]O2 is a conventional product. Example 1

[0056] First, 0.125 g of waste ternary cathode material was added to 50 mL of formamide solution to form a uniform suspension; then 0.55 g of zinc oxide was added to the above solution, transferred to a hydrothermal reactor, and heated at 190 °C for 6 h; then the mixture in the reactor was centrifuged at 6000 r / min for 20 min, the precipitate was washed 3 times with deionized water, then centrifuged and placed in an oven at 80 °C for 4 h to obtain a nickel-cobalt-manganese ternary zinc-nitrogen doped carbon precursor (RT-NiCoMn-Zn-NC).

[0057] In an argon atmosphere, the precursor was calcined at 950 °C in a tube furnace for 2 h, and the temperature was naturally reduced to obtain a calcined product at a heating rate of 2 °C / min. Afterwards, the calcined product was washed in deionized water and dried to obtain NiCoMn-Zn-NC. The scanning electron microscope photo of the synthesized NiCoMn-Zn-NC is shown in FIG. Figure 1 shown. Example 2

[0058] 0.125 g of waste ternary cathode material was added to 50 mL of formamide solution to form a uniform suspension, which was then transferred to a hydrothermal reactor and heated at 190 °C for 6 h; the mixture in the reactor was then centrifuged at 6000 r / min for 20 min, the precipitate was washed three times with deionized water, centrifuged again, and placed in an oven at 80 °C for 4 h to obtain a nickel-cobalt-manganese ternary nitrogen-doped carbon precursor.

[0059] In an argon atmosphere, the obtained precursor was calcined at 950 °C in a tube furnace for 2 h, and the temperature was naturally reduced to obtain a calcined product at a heating rate of 2 °C / min. Thereafter, the calcined product was washed in deionized water and dried to obtain NiCoMn-NC. The scanning electron microscope photo of the synthesized NiCoMn-NC is shown in FIG. Figure 2 shown. Example 3

[0060] 0.55 g of zinc oxide was added to 50 mL of formamide solution to form a uniform suspension, and the above solution was transferred to a hydrothermal reactor and heated at 190 °C for 6 h. The mixture in the reactor was centrifuged at 6000 r / min for 20 min, washed with deionized water 3 times, centrifuged again, and placed in an oven at 80 °C for 4 h to obtain a zinc-nitrogen doped carbon precursor.

[0061] In an argon atmosphere, the precursor was calcined at 950 °C in a tube furnace for 2 h, and the temperature was naturally reduced to obtain a calcined product at a heating rate of 2 °C / min. Afterwards, the calcined product was washed in deionized water and dried to obtain Zn-NC. The scanning electron microscope photo of the synthesized Zn-NC is shown in FIG. Figure 3 shown.

[0062] Figure 4 X-ray diffraction patterns of NiCoMn-Zn-NC, NiCoMn-NC and Zn-NC prepared in the above Examples 1-3. Figure 5 This is the full X-ray photoelectron spectrum of NiCoMn-Zn-NC, NiCoMn-NC, and Zn-NC prepared in the above Examples 1-3. Example 4

[0063] Take 5 mg of the three electrocatalysts synthesized above, 20 μL of perfluorosulfonic acid polymer solution (Nafion) in 980 μL of anhydrous ethanol and add them to a uniform suspension by conventional ultrasonication. Take 10 μL of the suspension and drop it on the glassy carbon electrode. Wait for the ethanol to evaporate to form a dense electrode film, which is used as the working electrode. The existing palladium carbon is used as a control.

[0064] The three-electrode system was used for the test. The electrolyte was 0.1 mol / L KOH saturated with oxygen. The counter electrode was a platinum electrode and the reference electrode was a saturated calomel electrode. During the test, oxygen was always allowed to flow into the 0.1 mol / L KOH solution. The evaluation results of the oxygen reduction catalytic performance of the prepared electrocatalyst are shown in the attached figure. Figure 6 and attached Figure 7 Among them, the onset potential of NiCoMn-Zn-NC is 0.975 V (vs RHE), the half-wave potential is 0.854 V (vs RHE), and the limiting current is 5.789 mA / cm 2 , superior to commercial platinum-carbon and most non-precious metal-based catalysts reported so far.

[0065] Example 5 Performance test of aluminum-air battery Align the hydrophobic carbon paper with the vent hole on the air electrode side of the mold and mark the 1 cm 2 As the reaction area of ​​the catalyst; 100 μL of the above-prepared catalyst solution (suspension of Example 4) is evenly dripped on the reaction area of ​​the air electrode. Attach the cut waterproof and breathable layer to the other side of the hydrophobic carbon paper; the electrolyte is prepared by 6 mol / L KOH solution. Air electrodes and aluminum plates are inserted on both sides of the aluminum-air battery, and the electrolyte is dripped through the middle pores. Finally, the aluminum-air battery is assembled in the order of zinc plate, electrolyte and catalyst layer / diffusion layer. The performance of the aluminum-air battery was tested at room temperature. The performance evaluation results of the assembled aluminum-air battery are attached. Figure 8 NiCoMn-Zn-NC is used as cathode material for aluminum-air batteries, with a specific power density of 125 mW / cm 2 . Example 6

[0066] This example provides a method for recycling and reusing ternary positive electrode materials, which is different from Example 1 only in that zinc oxide is replaced by zinc acetate, and the rest is the same.

[0067] Experiment was carried out with reference to Example 4, and the results are shown in Fig. 9 . Example 7

[0068] This example provides a method for recycling and reusing ternary positive electrode materials, which differs from Implementation Example 1 only in that the tubular furnace calcination temperature is 1050°C, and the remaining steps and parameters are the same. Example 8

[0069] This example provides a method for recycling and reusing ternary positive electrode materials, which differs from Implementation Example 1 only in that the calcination temperature in the tubular furnace is 850°C, and the remaining steps and parameters are the same. Example 9

[0070] This example provides a method for recycling and reusing ternary positive electrode materials. The only difference from Example 1 is that the calcined product is washed with 36wt% hydrochloric acid, then centrifuged at 6000 r / min for 20 min, the precipitate is washed with deionized water and dried to obtain the catalyst NiCoMn-Zn-NC-2. The remaining steps and parameters are the same. The experiment was carried out with reference to Example 4, and the results are shown in Fig.10 . Example 10

[0071] Experiment was carried out with reference to Example 4, and the results are shown in Fig.11 The red line in the figure represents the LSV curve of the precursor (RT-NiCoMn-Zn-NC). It can be seen from the figure that its starting potential is only 0.811 V, the half-wave potential is 0.604 V, and the limiting current is 2.44 mA / cm 2 , which is much smaller than that of NiCoMn-Zn-NC, indicating that the ORR performance of RT-NiCoMn-Zn-NC is very poor.

[0072] Based on the shortcomings of the prior art, how to improve the utilization rate of waste ternary positive electrode materials without causing secondary pollution is a key point of technical research in this field. The present invention uses waste ternary positive electrode materials as doping sources, and hydrothermally reacts with formamide solution in the presence of zinc ions to obtain a carbon precursor, which is then carbonized to obtain nickel-cobalt-manganese ternary zinc-nitrogen doped carbon materials, and applies them in the field of electrochemistry. The present invention has the advantages of high metal material recycling rate, low process cost, high safety and convenience for promotion. Realizing efficient recycling of waste ternary positive electrode materials will provide important support for the sustainable development of the lithium-ion battery industry.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for recycling ternary positive electrode materials, characterized in that: The method comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to complete the recovery of the ternary positive electrode material.

2. A method for preparing a ternary positive electrode material regeneration catalyst, characterized in that: The method comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to obtain recycled ternary positive electrode material; and then roasting the recycled ternary positive electrode material to obtain a regenerated catalyst for the ternary positive electrode material.

3. A method for recycling ternary positive electrode materials, characterized in that: The method comprises the following steps: mixing ternary positive electrode material waste and formamide and reacting them to obtain recycled ternary positive electrode material; then roasting the recycled ternary positive electrode material to obtain doped carbon material; and using the doped carbon material as a catalyst to complete the reuse of the ternary positive electrode material.

4. The method according to claim 1, 2 or 3, characterized in that: The ternary positive electrode material includes a lithium-ion battery ternary positive electrode material; the mass ratio of the formamide to the ternary positive electrode material waste is (2000-50):

1.

5. The method according to claim 1, 2 or 3, characterized in that: The reaction includes a hydrothermal reaction; the reaction is carried out in the presence of a zinc compound; the reaction temperature is 170-220° C., and the reaction time is 1-24 hours.

6. The method according to claim 2 or 3, characterized in that: The calcination is carried out under the protection of an inert atmosphere; the calcination temperature is 500-1100° C. and the calcination time is 1-99 hours.

7. The method according to claim 2 or 3, characterized in that: The calcination is a one-step calcination, and the calcined product is washed in water and dried.

8. The recycled ternary positive electrode material obtained by the method for recovering the ternary positive electrode material according to claim 1; or the regenerated catalyst of the ternary positive electrode material obtained by the method for reusing the ternary positive electrode material according to claim 2.

9. Use of the recovered ternary positive electrode material or the regenerated catalyst of the ternary positive electrode material as described in claim 8 in an electrochemical reaction.

10. An electrochemical reaction method, characterized in that: The electrocatalyst used includes the ternary positive electrode material regeneration catalyst as claimed in claim 8.

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