A method for preparing and applying regenerated ternary cathode materials suitable for large cylindrical batteries

Abstract

This invention belongs to the field of lithium-ion battery material technology, specifically relating to a method for preparing and applying a recycled ternary cathode material suitable for large cylindrical batteries. The invention provides a method for preparing a recycled ternary cathode material suitable for large cylindrical batteries. First, waste ternary cathode material is pulverized and then calcined at high temperature. Then, lithium leaching and transition metal precipitation are simultaneously achieved using a one-step oxalic acid method. The material is then mixed with nickel, cobalt, manganese, and lithium sources, followed by the addition of a dispersant and high-energy ball milling. Finally, high-temperature solid-state sintering is performed to obtain the recycled ternary cathode material. The recycled ternary cathode material of this invention exhibits good electrochemical performance and can be applied in large cylindrical batteries and related fields.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery material technology, specifically relating to a method for preparing and applying a regenerated ternary cathode material suitable for large cylindrical batteries. Background Technology

[0002] Lithium-ion batteries are rechargeable batteries that work by reversibly inserting and extracting lithium ions between the positive and negative electrodes. They are widely used in consumer electronics, electric vehicles, and energy storage systems. Lithium-ion batteries consist of four key materials: positive electrode material, negative electrode material, electrolyte, and separator. Among these, the positive electrode material is the most critical factor determining battery performance. An ideal positive electrode material should possess characteristics such as high specific capacity, high operating voltage, good structural stability, excellent ionic / electronic conductivity, and environmental friendliness.

[0003] With the explosive growth of the electric vehicle and energy storage markets, the amount of discarded lithium-ion batteries is increasing year by year, bringing enormous environmental pressure and resource waste, making the recycling of used lithium-ion batteries an urgent matter. The cathode material is the core of a lithium-ion battery, accounting for more than 40% of the total battery cost. The nickel, cobalt, and lithium metals it contains have extremely high recycling value. Extracting metals directly from waste batteries is cheaper and consumes less energy than smelting from ores, and the cathode material has the highest value. On the other hand, the cylindrical battery technology route, represented by Tesla's 4680 battery, has become one of the future development directions for power batteries due to its high energy density, high power output, and low-cost potential. Cylindrical batteries place more stringent requirements on the consistency, rate performance, and cycle life of the cathode material.

[0004] Currently, traditional methods for recycling waste cathode materials, such as pyrometallurgy and hydrometallurgy, suffer from problems such as long processes, high energy consumption, easy generation of secondary pollution, and poor performance of recycled materials. Especially for high-nickel ternary materials, the key to whether recycled materials can meet the standards of virgin materials lies in how to effectively repair their layered structure and remove lithium impurities while ensuring the uniformity of the proportion and distribution of transition metal elements during the recycling process.

[0005] Therefore, developing a low-cost, short-process recycling method that can regenerate high-performance cathode materials suitable for large cylindrical batteries and improve the electrochemical performance of the materials has significant economic and environmental value. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing and applying recycled ternary cathode materials suitable for large cylindrical batteries. This invention first crushes the waste ternary cathode material and then calcines it at high temperature. Then, it uses an oxalic acid one-step method to simultaneously achieve lithium leaching and transition metal precipitation. The material is then mixed with nickel, cobalt, manganese, and lithium sources, and a dispersant is added for high-energy ball milling. Finally, a recycled ternary cathode material with good electrochemical performance is prepared by high-temperature solid-state sintering, enabling it to be applied in large cylindrical batteries and related fields.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries, comprising the following steps:

[0009] S1. Waste ternary cathode material is crushed and then calcined at high temperature to obtain black powder;

[0010] S2. The black powder described in step S1 is added to an oxalic acid aqueous solution and stirred to react. Vacuum filtration is performed to separate the solid and liquid phases and obtain the transition metal oxalate precursor.

[0011] S3. Add nickel source, cobalt source, manganese source and lithium source to the transition metal oxalate precursor described in step S2, and mix evenly to obtain a mixture;

[0012] S4. Add a dispersant to the mixture described in step S3 and perform high-energy ball milling to obtain a ball-milled mixture;

[0013] S5. The ball-milled mixture described in step S4 is subjected to high-temperature solid-state sintering under an oxygen atmosphere to obtain a regenerated ternary cathode material suitable for large cylindrical batteries.

[0014] As a preferred embodiment, the conditions for high-temperature calcination in step S1 are as follows: the calcination temperature is 500~700℃, specifically 500℃, 550℃, 5600℃, 650℃ or 700℃; the calcination time is 2~8h, specifically 2h, 4h, 6h or 8h.

[0015] As a preferred embodiment, the conditions for the stirring reaction in step S2 are as follows: the concentration of the oxalic acid aqueous solution is 0.3~1.0 mol / L, specifically 0.3 mol / L, 0.5 mol / L, 0.7 mol / L or 1.0 mol / L; the solid-liquid ratio of the black powder to the oxalic acid aqueous solution is 10~30 g / L, specifically 10 g / L, 20 g / L or 30 g / L; the reaction temperature is 30~80℃, specifically 30℃, 40℃, 50℃, 60℃, 70℃ or 80℃; and the reaction time is 0.5~3.0 h, specifically 0.5 h, 1.0 h, 1.5 h, 2.0 h, 2.5 h or 3.0 h.

[0016] As a preferred embodiment, the molar ratio of manganese in the nickel source, cobalt in the cobalt source, manganese in the manganese source, and lithium in the lithium source in step S3 is (0.8-0.9):(0.05-0.1):(0.05-0.1):1.1.

[0017] This invention adds an excessive amount of controlled lithium source. Since lithium salts volatilize at high temperatures, the excessive addition ensures that there is sufficient lithium in the final product. In addition, a sufficiently high lithium content can shorten the reaction time, thereby reducing the tendency of nickel to enter the lithium layer at high temperatures, maintaining the order of the layered structure, and effectively suppressing the phenomenon of "lithium-nickel mixing".

[0018] As a preferred embodiment, the nickel source in step S3 is selected from at least one of nickel oxalate, nickel oxide, and nickel carbonate;

[0019] The cobalt source is selected from at least one of cobalt oxalate, cobalt oxide, and cobalt carbonate;

[0020] The manganese source is selected from at least one of manganese oxalate, manganese oxide, and manganese carbonate;

[0021] The lithium source is selected from at least one of lithium carbonate, lithium hydroxide, and lithium nitrate.

[0022] As a preferred embodiment, the nickel source is nickel oxalate, the cobalt source is cobalt oxalate, the manganese source is manganese oxalate, and the lithium source is lithium carbonate.

[0023] The metal supplement source and the transition metal oxalate precursor substrate of the present invention are isomorphous oxalates, which have good phase compatibility and more uniform distribution of transition metals after mixing; there are no other impurities or salts, and the crystal lattice purity is high after sintering; the excess lithium carbonate precisely matches the lithium loss during the decomposition and sintering process of oxalate, maximizing the preservation of the integrity of the α-NaFeO2 layered structure.

[0024] As a preferred embodiment, the mass ratio of the mixture to the dispersant is 1:(4-6).

[0025] As a preferred embodiment, the dispersant in step S4 is selected from at least one of anhydrous ethanol, isopropanol, or deionized water.

[0026] As a preferred embodiment, the dispersant is anhydrous ethanol and deionized water;

[0027] The mass ratio of anhydrous ethanol to deionized water in the dispersant is (1-2):1.

[0028] This invention uses anhydrous ethanol and deionized water as compound dispersants. Anhydrous ethanol has low surface tension and can quickly penetrate into the gaps between powder particles, breaking the van der Waals forces between powder particles and thus preventing agglomeration. At the same time, the wettability of ethanol on oxalate powder can prevent powder from floating. The addition of deionized water can regulate the viscosity of the mixture during ball milling and avoid particle size unevenness caused by excessive collision of powder particles in high-energy ball milling.

[0029] As a preferred embodiment, the conditions for high-energy ball milling in step S4 are: ball milling speed of 200~600 r / min and ball milling time of 3~12 h.

[0030] As a preferred embodiment, the conditions for high-temperature solid-state sintering in step S5 are as follows: first, hold at 400~600℃ for 2~6h, then hold at 700~950℃ for 8~15h, with a heating rate of 2~4℃ / min.

[0031] This invention controls the heating rate during high-temperature solid-state sintering to avoid local overheating or reaction lag, promotes uniform nucleation and inhibits the formation of impurity phases, and significantly reduces lithium volatilization and oxygen loss. At the same time, it effectively avoids adverse phenomena such as uneven lithium distribution, aggravated cation mixing, and uneven particle sintering caused by excessively rapid heating rate. Therefore, it can effectively improve the charge and discharge performance of cathode materials.

[0032] As a preferred embodiment, the chemical formula of the regenerated ternary cathode material in step S5 is LiNi. 0.8 Co 0.1 Mn 0.1 O2 has a primary particle size of 100~500nm and a crystal structure of α-NaFeO2 layered structure.

[0033] The primary particles of the recycled ternary cathode material of this invention have a size of 100~500nm and a crystal structure of α-NaFeO2 layered structure. The complete α-NaFeO2 layered structure provides the largest lithium interlayer spacing and unobstructed two-dimensional lithium-ion channels. The short diffusion path ensures that lithium ions can be rapidly extracted and inserted from the bulk phase of each primary particle. This solves the problems of primary particle agglomeration and growth, many defects in the layered structure, and high ion migration resistance in traditional recycling processes, and achieves a comprehensive improvement in the performance of the recycled ternary cathode material, making it suitable for large cylindrical batteries.

[0034] Secondly, the present invention provides an application of the recycled ternary cathode material prepared by the preparation method described in the first aspect in a battery.

[0035] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0036] (1) The present invention adopts a one-step method of oxalic acid to simultaneously achieve lithium leaching and transition metal precipitation, replacing the complex separation and purification steps in traditional recycling, eliminating the need to add expensive reducing agents, and significantly reducing raw material and process costs; at the same time, through precise stoichiometric control and optimized solid-state sintering technology, the regenerated ternary cathode material has a complete layered crystal structure, uniform particle morphology and low interfacial impedance, and also has good rate performance, cycle life and capacity retention; the high-performance regenerated ternary cathode material of the present invention can directly meet the stringent requirements of large cylindrical batteries for cathode materials, and has the flexibility to process waste ternary materials from different sources, providing a reliable solution for low-cost and high-performance recycling of power batteries.

[0037] (2) The addition of excess lithium source in this invention can ensure that sufficient active lithium ions participate in the insertion and extraction reaction, maintain a good layered structure and provide more lithium vacancies, promote lithium ion diffusion through the ordered layered structure and optimized interface, reduce lithium-nickel mixing, stabilize the crystal structure, slow down phase transition and microcrack generation during cycling, thereby effectively improving the electrochemical performance of the material.

[0038] (3) This invention uses transition metal oxalate precursors as substrates and uses isomorphous nickel oxalate, cobalt oxalate and manganese oxalate as supplementary sources (without the introduction of other impurity salts). It is combined with excess lithium carbonate as lithium source. Through wet ball milling homogenization and gradient oxygen atmosphere sintering, the precise supplementation of transition metal elements and efficient compensation of lattice lithium are achieved. The core solution is to solve the problems of impurity residue and component segregation caused by traditional sulfate supplementation. At the same time, excess Li⁺ is used to repair layered lattice defects and suppress cation mixing, which ultimately significantly improves the charge and discharge performance of the cathode material.

[0039] (4) By controlling the mass ratio of anhydrous ethanol and deionized water in the compound dispersant, this invention ensures that the powder after ball milling is free from hard agglomeration and has a uniform particle surface area. The ultrafine powder after high-energy ball milling has high sintering activity, and the grains grow in an orderly manner during the sintering process. At the same time, since both anhydrous ethanol and deionized water are volatile small molecules, there are no organic residues or ionic impurities in the powder, thereby effectively improving the electrochemical performance of the cathode material. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a scanning electron microscope image of the regenerated ternary cathode material in Embodiment 1 of the present invention.

[0042] Figure 2 The CV curves of the coin cell assembled from the recycled ternary cathode material in Example 1 of this invention are shown at different scan rates.

[0043] Figure 3 The Nyquist plots are shown for the regenerated ternary cathode material and the commercial MCN811 ternary cathode material in Example 1 of this invention. Detailed Implementation

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The sources of some components in the examples and comparative examples are as follows:

[0046] Nickel oxalate, CAS No. 6018-94-6;

[0047] Nickel oxide, CAS No. 1314-06-3;

[0048] Cobalt oxalate, CAS No. 814-89-1;

[0049] Cobalt oxide, CAS No. 1307-96-6;

[0050] Manganese oxalate, CAS No. 40-67-5;

[0051] Manganese oxide, CAS No. 1344-43-0;

[0052] Lithium carbonate, CAS No. 554-13-2;

[0053] Lithium nitrate, CAS No. 7790-69-4.

[0054] Example 1

[0055] This embodiment provides a method for preparing regenerated ternary cathode materials suitable for large cylindrical batteries, including the following steps:

[0056] S1. The waste ternary cathode material is crushed and then calcined at high temperature (calcination temperature is 650℃, calcination time is 5h) to obtain a black powder; S2. The black powder obtained in step S1 is added to a 0.5mol / L oxalic acid aqueous solution for stirring reaction (reaction temperature is 60℃, reaction time is 1.0h), vacuum filtered, and solid-liquid separation is performed to obtain a transition metal oxalate precursor; the solid-liquid ratio of the black powder to the oxalic acid aqueous solution is 20g / L;

[0057] S3. Add nickel oxalate, cobalt oxalate, manganese oxalate, and lithium carbonate to the transition metal oxalate precursor described in step S2, and mix evenly to obtain a mixture; the molar ratio of manganese in the nickel source, cobalt in the cobalt source, manganese in the manganese source, and lithium in the lithium source is 0.8:0.1:0.1:1.1.

[0058] S4. Add anhydrous ethanol as a dispersant to the mixture obtained in step S3 and perform high-energy ball milling (ball milling speed is 400 r / min, ball milling time is 8 h) to obtain a ball-milled mixture; the mass ratio of the mixture to the dispersant is 1:5.

[0059] S5. The ball-milled mixture described in step S4 is placed in an oxygen atmosphere for high-temperature solid-state sintering. First, it is kept at 500℃ for 4 hours, and then at 850℃ for 12 hours. The heating rate is 2℃ / min, to obtain a regenerated ternary cathode material suitable for large cylindrical batteries.

[0060] The chemical formula of the regenerated ternary cathode material is LiNi. 0.8 Co 0.1 Mn 0.1 O2 has a primary particle size of 300 nm and a crystal structure of α-NaFeO2 layered structure.

[0061] Example 2

[0062] This embodiment provides a method for preparing regenerated ternary cathode materials suitable for large cylindrical batteries, including the following steps:

[0063] S1. The waste ternary cathode material is crushed and then calcined at high temperature (calcination temperature is 700℃, calcination time is 2h) to obtain black powder;

[0064] S2. The black powder described in step S1 is added to a 1.0 mol / L oxalic acid aqueous solution and stirred for reaction (reaction temperature is 80℃, reaction time is 0.5h). Vacuum filtration is performed to separate the solid and liquid phases, yielding a transition metal oxalate precursor. The solid-liquid ratio of the black powder to the oxalic acid aqueous solution is 30 g / L.

[0065] S3. Add nickel oxalate, cobalt oxalate, manganese oxalate, and lithium carbonate to the transition metal oxalate precursor described in step S2, and mix evenly to obtain a mixture; the molar ratio of manganese in the nickel source, cobalt in the cobalt source, manganese in the manganese source, and lithium in the lithium source is 0.8:0.1:0.1:1.1.

[0066] S4. Add isopropanol, a dispersant, to the mixture described in step S3 and perform high-energy ball milling (ball milling speed is 600 r / min, ball milling time is 3 h) to obtain a ball-milled mixture; the mass ratio of the mixture to the dispersant is 1:6.

[0067] S5. The ball-milled mixture described in step S4 is placed in an oxygen atmosphere for high-temperature solid-state sintering. First, it is kept at 600℃ for 2 hours, and then at 950℃ for 8 hours. The heating rate is 4℃ / min, to obtain a regenerated ternary cathode material suitable for large cylindrical batteries.

[0068] The chemical formula of the regenerated ternary cathode material is LiNi. 0.8 Co 0.1 Mn 0.1 O2 has a primary particle size of 500 nm and a crystal structure of α-NaFeO2 layered structure.

[0069] Example 3

[0070] This embodiment provides a method for preparing regenerated ternary cathode materials suitable for large cylindrical batteries, including the following steps:

[0071] S1. The waste ternary cathode material is crushed and then calcined at high temperature (calcination temperature is 500℃, calcination time is 8h) to obtain black powder.

[0072] S2. The black powder described in step S1 is added to a 0.3 mol / L oxalic acid aqueous solution and stirred for reaction (reaction temperature is 30℃, reaction time is 3.0 h). Vacuum filtration is performed to separate the solid and liquid phases, yielding a transition metal oxalate precursor. The solid-liquid ratio of the black powder to the oxalic acid aqueous solution is 10 g / L.

[0073] S3. Add nickel oxalate, cobalt oxalate, manganese oxalate, and lithium carbonate to the transition metal oxalate precursor described in step S2, and mix evenly to obtain a mixture; the molar ratio of manganese in the nickel source, cobalt in the cobalt source, manganese in the manganese source, and lithium in the lithium source is 0.8:0.1:0.1:1.1.

[0074] S4. Add the dispersant and deionized water to the mixture obtained in step S3 and perform high-energy ball milling (ball milling speed is 200 r / min, ball milling time is 12 h) to obtain a ball-milled mixture; the mass ratio of the mixture to the dispersant is 1:4.

[0075] S5. The ball-milled mixture described in step S4 is placed in an oxygen atmosphere for high-temperature solid-state sintering. First, it is kept at 400℃ for 6 hours, and then at 700℃ for 15 hours. The heating rate is 3℃ / min, to obtain a regenerated ternary cathode material suitable for large cylindrical batteries.

[0076] The chemical formula of the regenerated ternary cathode material is LiNi. 0.8 Co 0.1 Mn 0.1 O2 has a primary particle size of 100 nm and a crystal structure of α-NaFeO2 layered structure.

[0077] Example 4

[0078] The difference between this comparative example and Example 1 is that nickel oxide was used instead of nickel oxalate in the nickel source.

[0079] Example 5

[0080] The difference between this comparative example and Example 1 is that cobalt oxide was used instead of cobalt oxalate in the cobalt source.

[0081] Example 6

[0082] The difference between this comparative example and Example 1 is that manganese oxide was used instead of manganese oxalate in the manganese source.

[0083] Example 7

[0084] The difference between this comparative example and Example 1 is that the dispersant used is anhydrous ethanol and deionized water (mass ratio of the two is 2:1).

[0085] Comparative Example 1

[0086] The difference between this comparative example and Example 1 is that the commercial MCN811 cathode material was used instead of the cathode material in Example 1.

[0087] Comparative Example 2

[0088] The difference between this comparative example and Example 1 is that the heating rate was changed from 2℃ / min to 10℃ / min.

[0089] Performance testing

[0090] Regenerated ternary cathode materials were used in lithium-ion batteries, lithium metal sheets were used as anodes, PP separators were used, and 2025 coin cells were assembled for charge and discharge performance testing.

[0091] Table 1 Performance Test Results

[0092]

[0093] This invention employs a one-step oxalic acid method to simultaneously achieve lithium leaching and transition metal precipitation, replacing the complex separation and purification steps in traditional recycling. It eliminates the need for expensive reducing agents, significantly reducing raw material and process costs. Simultaneously, through precise stoichiometric control and optimized solid-state sintering technology, the regenerated ternary cathode material possesses a complete layered crystal structure, uniform particle morphology, and low interfacial impedance, while also exhibiting excellent rate performance, cycle life, and capacity retention.

[0094] Compared to Example 1, replacing nickel oxalate with nickel oxide in the nickel source resulted in a decrease in the electrochemical performance of the material (Example 4); replacing cobalt oxalate with cobalt oxide in the cobalt source resulted in a decrease in the electrochemical performance of the material (Example 5); replacing manganese oxalate with manganese oxide in the manganese source resulted in a decrease in the electrochemical performance of the material (Example 6); replacing anhydrous ethanol and deionized water (mass ratio 2:1) as the dispersant as in Example 1 resulted in a decrease in the electrochemical performance of the material (Example 7); replacing the cathode material of Example 1 with commercial MCN811 cathode material as in Example 1 (Comparative Example 1); changing the heating rate from 2°C / min to 10°C / min as in Example 1 resulted in a decrease in the electrochemical performance of the material (Comparative Example 2).

Claims

1. A method for preparing regenerated ternary cathode material suitable for large cylindrical batteries, characterized in that, Includes the following steps: S1. Waste ternary cathode material is crushed and then calcined at high temperature to obtain black powder; S2. The black powder described in step S1 is added to an oxalic acid aqueous solution and stirred to react. Vacuum filtration is performed to separate the solid and liquid phases and obtain the transition metal oxalate precursor. S3. Add nickel source, cobalt source, manganese source and lithium source to the transition metal oxalate precursor described in step S2, and mix evenly to obtain a mixture; S4. Add a dispersant to the mixture described in step S3 and perform high-energy ball milling to obtain a ball-milled mixture; S5. The ball-milled mixture described in step S4 is subjected to high-temperature solid-state sintering under an oxygen atmosphere to obtain a regenerated ternary cathode material suitable for large cylindrical batteries.

2. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, The conditions for high-temperature calcination in step S1 are: calcination temperature of 500~700℃ and calcination time of 2~8h; The conditions for the stirring reaction in step S2 are as follows: the concentration of oxalic acid aqueous solution is 0.3~1.0 mol / L, the solid-liquid ratio of black powder to oxalic acid aqueous solution is 10~30 g / L, the reaction temperature is 30~80℃, and the reaction time is 0.5~3.0 h.

3. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, In step S3, the molar ratio of manganese in the nickel source, cobalt in the cobalt source, manganese in the manganese source, and lithium in the lithium source is (0.8-0.9):(0.05-0.1):(0.05-0.1):1.

1.

4. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, The nickel source mentioned in step S3 is selected from at least one of nickel oxalate, nickel oxide, and nickel carbonate; The cobalt source is selected from at least one of cobalt oxalate, cobalt oxide, and cobalt carbonate; The manganese source is selected from at least one of manganese oxalate, manganese oxide, and manganese carbonate; The lithium source is selected from at least one of lithium carbonate, lithium hydroxide, and lithium nitrate.

5. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 4, characterized in that, The nickel source is nickel oxalate, the cobalt source is cobalt oxalate, the manganese source is manganese oxalate, and the lithium source is lithium carbonate.

6. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, The dispersant in step S4 is selected from at least one of anhydrous ethanol, isopropanol, or deionized water.

7. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 6, characterized in that, The dispersant is anhydrous ethanol and deionized water; The mass ratio of anhydrous ethanol to deionized water in the dispersant is (1-2):

1.

8. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, The conditions for high-energy ball milling in step S4 are: ball milling speed of 200~600 r / min and ball milling time of 3~12 h; The conditions for high-temperature solid-state sintering in step S5 are as follows: first, hold at 400~600℃ for 2~6h, then hold at 700~950℃ for 8~15h, with a heating rate of 2~4℃ / min.

9. The method for preparing a regenerated ternary cathode material suitable for large cylindrical batteries according to claim 1, characterized in that, The general chemical formula of the regenerated ternary cathode material mentioned in step S5 is LiNi. 0.8 Co 0.1 Mn 0.1 O2 has a primary particle size of 100~500nm and a crystal structure of α-NaFeO2 layered structure.

10. The application of a recycled ternary cathode material prepared by the preparation method according to any one of claims 1-9 in a battery.

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