A method for recovering and regenerating a fast-charging adaptive positive electrode material from a retired lithium iron phosphate battery, and a fast-charging adaptive positive electrode material and a fast-charging battery

Abstract

This invention discloses a method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries, as well as a fast-charging compatible cathode material and a fast-charging battery. First, LiFePO4 powder is recovered through low-temperature flexible separation, and then subjected to Ti... 4+ / Zr 4+ Co-doping and lithium-iron reconstruction, Ti 4+ With Zr 4+ Partial Fe was replaced by ion exchange. 2+ Lattice sites, constructing Li + The transmission channel is then modified with multi-walled carbon nanotubes and reduced graphene oxide to form a dense carbon nanotube-graphene-amorphous carbon composite conductive network on the surface. Finally, the positive electrode material is crystallized and shaped through short-range high-temperature densification. Through a four-step synergistic process of low-temperature flexible separation, precise lithium iron phosphate reconstruction, composite conductive modification and short-range crystallization and shaping, high-value regeneration of retired LFPs is achieved. The fast-charging battery prepared from it has a capacity retention rate of ≥96% at 8C charging and a capacity retention rate of ≥90% after 1000 cycles at 8C rate.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery recycling and cathode material preparation technology, specifically relating to a method for recycling and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries, as well as a fast-charging compatible cathode material and a fast-charging battery. Background Technology

[0002] Lithium iron phosphate (LiFePO4) has a theoretical capacity of 175 mAh / g and a redox potential of 3.45 V (vs. Li + With advantages such as its high lithium iron phosphate (LiFePO4) content and thermal decomposition temperature exceeding 500℃, it holds a 38% share of the global power battery market (2023 data, GGII). As the first batch of power batteries enters their retirement period, the global retired lithium iron phosphate batteries will reach 5.2 million tons by 2030. Every 10% increase in lithium resource recovery rate can reduce lithium mining by 200,000 tons.

[0003] Existing lithium iron phosphate recycling technologies have significant drawbacks:

[0004] Pyrometallurgy: High-temperature smelting at 1200-1500℃, energy consumption of 4.5-7.0 kWh / kg, production of toxic gases such as SO2 and HF, lithium recovery rate of only 75-85%, and secondary purification of recycled products.

[0005] Hydrometallurgy: Lithium recovery rate is 90-95% through leaching with H2SO4 + H2O2, but the chemical reagent consumption is 0.8-1.2 t / t (calculated as H2SO4), and the wastewater discharge is 5-8 m³. 3 / t, and Fe 3+ Reduction, Al 3+ Removal requires multiple steps of precipitation and is a complex process.

[0006] Direct recycling: This method employs a lithium supplementation calcination process, consuming 1.5-3.0 kWh / kg of energy, and presents three major challenges. Challenge 1: Lithium from decommissioned LFPs... + The first problem is the loss rate of 5-15%, resulting in a Li / Fe mixing degree of 5-8%, which disrupts the one-dimensional lithium-ion transport channel; the second problem is that high-temperature calcination causes the original carbon coating layer to oxidize and fall off, reducing the carbon content from 3-5% to 1-2%; the third problem is that the residual content of impurities such as Al and Cu is >0.3%, resulting in an ionic conductivity of only 10 in the recycled material. -10 -10 -8 With a charging speed of S / cm, the capacity of a 15-minute fast charge is only 55-65% of the rated capacity, which cannot meet the fast charging requirements of new energy vehicles (GB / T 39048-2020 requires fast charging to 80% capacity in 15 minutes).

[0007] Therefore, developing a fast-charging compatible recycling process that can simultaneously address crystal defect repair, deep impurity removal, and improved electron / ion transport performance is a key technological challenge in the field of lithium iron phosphate recycling. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate (LFP) batteries. Through a four-step synergistic process of low-temperature flexible separation, precise lithium iron phosphate reconstruction, composite conductive modification, and short-range crystallization shaping, high-value regeneration of retired LFPs is achieved. This method is applicable to the resource recycling of retired LFP batteries in fields such as electric vehicles and energy storage base stations, as well as the industrial production of high-power-density power battery cathode materials.

[0009] This invention also provides a fast-charging compatible cathode material, prepared using the method described in this invention, wherein the electronic conductivity of the fast-charging compatible cathode material reaches 1.5 × 10⁻⁶. -2 -3.0×10 -2 S / cm.

[0010] The present invention also provides a fast-charging battery, wherein the positive electrode material of the fast-charging battery is the fast-charging adapted positive electrode material described in the present invention, and the fast-charging battery has an 8C charging capacity retention rate of ≥96% and an 8C rate cycle 1000 cycles capacity retention rate of ≥90%.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] This invention provides a method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries, the method comprising the following steps:

[0013] (1) Discharge the retired lithium iron phosphate battery with constant current, and then disassemble and separate the positive electrode plate;

[0014] (2) Under an inert atmosphere, the positive electrode sheet is subjected to plasma-assisted transient high-temperature impact treatment, the powder peeled off from the positive current collector is collected, and then fine powder impurities with a particle size ≤1 μm are removed to obtain LiFePO4 powder.

[0015] (3) Add lithium hydroxide aqueous solution, tetrabutyl titanate and zirconium oxychloride to LiFePO4 powder, stir and react for 20-40 min, then centrifuge and dry to obtain Ti / Zr co-doped lithium iron reconstructed powder;

[0016] (4) The Ti / Zr co-doped lithium iron reconstructed powder was mixed with multi-walled carbon nanotubes, reduced graphene oxide and anhydrous ethanol, and ultrasonically dispersed to obtain a suspension. Then, it was spray-dried to obtain composite powder.

[0017] (5) Place the composite powder in a plasma-enhanced chemical vapor deposition apparatus, introduce acetylene gas, and perform vacuum treatment for 5-10 min to obtain carbon nanotube / graphene modified composite powder.

[0018] (6) Under an inert atmosphere, the carbon nanotube / graphene modified composite powder is subjected to transient high-temperature impact treatment with a secondary pulse current, and then pulverized after natural cooling to obtain a fast-charging compatible cathode material.

[0019] In step (1), the retired lithium iron phosphate battery is discharged to 1.8-2.0 V using a constant current of 0.5C.

[0020] In step (2), the conditions for plasma-assisted transient high-temperature impact treatment are: peak temperature 400-500℃, pulse voltage 60-75 V, pulse current 25-30 A, and impact time 1-3 s; fine powder impurities with a particle size ≤1 μm are removed by an airflow separator with a wind speed of 15-20 m / s.

[0021] In step (3), the solid-liquid ratio of LiFePO4 powder to lithium hydroxide aqueous solution is 1 g: 10-15 mL, and the concentration of lithium hydroxide aqueous solution is 0.05-0.5 mol / L; the Ti doping amount in Ti / Zr co-doped lithium iron reconstructed powder is 0.5-2% of the molar amount of LiFePO4, and the Zr doping amount is 0.3-1% of the molar amount of LiFePO4.

[0022] In step (4), the mass ratio of Ti / Zr co-doped lithium iron reconstructed powder to multi-walled carbon nanotubes and reduced graphene oxide is 100:1-5:0.5-1.5; the solid content of the suspension is 10-15 wt%.

[0023] In step (5), the power of the plasma-enhanced chemical vapor deposition equipment is 100-150 W and the vacuum degree is 10-20 Pa.

[0024] In step (6), the conditions for the transient high-temperature impact treatment with secondary pulse current are: peak temperature 650-750℃, pulse voltage 100-120 V, pulse current 70-90 A, and impact time 20-30 s.

[0025] In step (6), the particle size of the fast-charging compatible cathode material is 5-15 μm and the D50 is 8-10 μm.

[0026] The present invention provides a method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries. To meet the requirements of fast charging, the method first involves low-temperature flexible separation to recover LiFePO4 powder, followed by Ti / Zr co-doping and lithium iron phosphate reconstruction of the recovered LiFePO4 powder. 4+ With Zr 4+ Partial Fe was replaced by ion exchange. 2+ Lattice sites, constructing Li + The transmission channel is then modified with multi-walled carbon nanotubes and reduced graphene oxide to form a dense carbon nanotube-graphene-amorphous carbon composite conductive network on the surface; finally, the positive electrode material is crystallized and shaped by short-range high-temperature densification.

[0027] In the method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries provided by this invention, Ti 4+ With Zr 4+ Partial Fe was replaced by ion exchange. 2+ Lattice sites, due to Ti 4+ / Zr 4+ with Fe 2+ The differences in radius and charge introduce lattice distortion and local electric field gradients within the crystal lattice. This distortion not only reduces the efficiency of Li... + The migration barrier not only created more branches within the originally single channel, but also greatly accelerated Li's migration. + The diffusion rate in the solid phase. Surface modification with multi-walled carbon nanotubes and reduced graphene oxide not only significantly increases the conductivity of the material and shortens the electron transport distance from the current collector to the interior of the active material particles, but also effectively inhibits particle agglomeration and pulverization during repeated lithium insertion / extraction processes, ensuring that electrons can still quickly reach each active site under high current during fast charging. The final short-range high-temperature treatment ensures the full crystallization of the material, forming a pure phase with high crystallinity and stable structure. At the same time, moderate high-temperature treatment can eliminate some interface defects and reduce charge transfer resistance. The particle structure after densification treatment is more compact, exhibiting better structural stability under the huge volume expansion effect brought about by fast charging. This rigid framework not only prevents the material from collapsing, but also maintains a stable solid-liquid interface, avoiding the accumulation of interfacial side reactions, thereby ensuring cycle life and safety at high rates.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention employs plasma-assisted transient high-temperature shock treatment of the positive electrode sheet. The transient high-temperature shock treatment achieves Al foil separation purity >99.5%, lithium recovery rate ≥97%, Fe and P recovery rate ≥99%, and total impurity (Al, Cu, Ca, Mg) content <0.1%, meeting the purity requirements of battery-grade lithium iron phosphate.

[0030] This invention achieves a breakthrough in battery fast charging performance. Through surface modification of multi-walled carbon nanotubes and reduced graphene oxide, the electronic conductivity of the cathode material reaches 1.5×10⁻²–3.0×10⁻² S / cm. Batteries prepared using the cathode material described in this invention have an 8C charging capacity retention rate of ≥96% and an 8C rate cycle capacity retention rate of ≥90% after 1000 cycles.

[0031] The method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries provided by this invention has a total energy consumption of 1.2-1.8 kWh / kg, which is more than 60% lower than traditional pyrometallurgy and 90% lower than hydrometallurgy. The fluorinated carbon coating formed by PVDF carbonization replaces the additional carbon source, increasing the carbon utilization rate to 92% and achieving resource closed-loop.

[0032] The method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries provided by this invention has a total time of less than 40 seconds for transient high-temperature shock during the pretreatment and crystallization stages. If a PLC control system is used to achieve precise control of process parameters, the capacity of a single production line can reach 10,000 tons / year, and the cost of recycled materials is reduced by 20-30% compared with commercial fast-charging LFP. Attached Figure Description

[0033] Figure 1 The rate discharge test diagram shows the battery cell prepared using the fast-charging compatible cathode material in Example 1 and the lithium iron phosphate in Comparative Example 1.

[0034] Figure 2 The charging temperature rise of the battery cell prepared using the fast-charging compatible cathode material in Example 1 and the lithium iron phosphate in Comparative Example 1 at different charging rates is shown in the graph.

[0035] Figure 3 The DC internal resistance of a battery cell prepared using the fast-charging compatible cathode material in Example 1 and the lithium iron phosphate in Comparative Example 1 under 25°C and 8C pulse charging at different SOCs is shown in the diagram.

[0036] Figure 4 The discharge capacity retention curves of the battery cell prepared using the fast-charging compatible cathode material in Example 1 and the lithium iron phosphate in Comparative Example 1 under 8C charge / 8C discharge cycles are shown. Detailed Implementation

[0037] This invention provides a method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries, the method comprising the following steps:

[0038] (1) Discharge the retired lithium iron phosphate battery with constant current, and then disassemble and separate the positive electrode plate;

[0039] (2) Under an inert atmosphere, the positive electrode sheet is subjected to plasma-assisted transient high-temperature impact treatment, the powder peeled off from the positive current collector is collected, and then fine powder impurities with a particle size ≤1 μm are removed to obtain LiFePO4 powder.

[0040] (3) Add lithium hydroxide aqueous solution, tetrabutyl titanate and zirconium oxychloride to LiFePO4 powder, stir and react for 20-40 min, then centrifuge and dry to obtain Ti / Zr co-doped lithium iron reconstructed powder;

[0041] (4) The Ti / Zr co-doped lithium iron reconstructed powder was mixed with multi-walled carbon nanotubes, reduced graphene oxide and anhydrous ethanol, and ultrasonically dispersed to obtain a suspension. Then, it was spray-dried to obtain composite powder.

[0042] (5) Place the composite powder in a plasma-enhanced chemical vapor deposition apparatus, introduce acetylene gas, and perform vacuum treatment for 5-10 min to obtain carbon nanotube / graphene modified composite powder.

[0043] (6) Under an inert atmosphere, the carbon nanotube / graphene modified composite powder is subjected to transient high-temperature impact treatment with a secondary pulse current, and then pulverized after natural cooling to obtain a fast-charging compatible cathode material.

[0044] Further, in step (1), the retired lithium iron phosphate battery is discharged to 1.8-2.0V by a constant current of 0.5C, preferably to 1.8V by a constant current of 0.5C.

[0045] In step (2), the conditions for plasma-assisted transient high-temperature impact treatment are: peak temperature 400-500℃, pulse voltage 60-75 V, pulse current 25-30 A, impact time 1-3 s, preferably 450℃, voltage 70 V, current 28 A, and impact time 2 s; fine powder impurities with a particle size ≤1 μm are removed by an airflow separator with a wind speed of 15-20 m / s.

[0046] In step (3), the solid-liquid ratio of LiFePO4 powder to lithium hydroxide aqueous solution is 1 g:10-15 mL, preferably 1 g:12 mL; the concentration of lithium hydroxide aqueous solution is 0.05-0.5 mol / L, preferably 0.2 mol / L; in the Ti / Zr co-doped lithium iron reconstructed powder, the Ti doping amount is 0.5-2% of the molar amount of LiFePO4, and the Zr doping amount is 0.3-1% of the molar amount of LiFePO4, preferably 1% of the molar amount of Ti and 0.5% of the molar amount of Zr.

[0047] In step (4), the mass ratio of Ti / Zr co-doped lithium iron reconstructed powder to multi-walled carbon nanotubes and reduced graphene oxide is 100:1-5:0.5-1.5; the solid content of the suspension is 10-15 wt%.

[0048] In step (5), the power of the plasma-enhanced chemical vapor deposition equipment is 100-150 W and the vacuum degree is 10-20 Pa; preferably, the power is 120 W and the vacuum degree is 15 Pa.

[0049] In step (6), the conditions for the transient high-temperature impact treatment with secondary pulse current are: peak temperature 650-750℃, pulse voltage 100-120 V, pulse current 70-90 A, and impact time 20-30 s; preferably, peak temperature 700℃, pulse voltage 110 V, pulse current 80 A, and impact time 25 s.

[0050] In step (6), the particle size of the fast-charging compatible cathode material is 5-15 μm and the D50 is 8-10 μm.

[0051] The present invention will now be described in detail with reference to the embodiments. Unless otherwise specified, all raw materials used in the embodiments can be purchased from the market.

[0052] Example 1

[0053] A method for recovering and regenerating fast-charge-compatible cathode materials from retired lithium iron phosphate batteries includes the following steps:

[0054] (1) The retired lithium iron phosphate power battery with a cycle SOC of 72% of model 32140 was discharged to 1.8V at 0.5C, and then the positive electrode was disassembled and separated. The obtained positive electrode contained 85 wt.% LiFePO4, 12 wt.% Al foil, 3 wt.% PVDF, Li / Fe molar ratio of 0.91, and Li / Fe mixing degree of 6.2%;

[0055] (2) Under an argon atmosphere with a flow rate of 60 mL / min, the positive electrode sheet was laid flat on graphite-based carbon paper and subjected to plasma-assisted transient high-temperature impact treatment at a temperature of 450℃, a voltage of 70 V, a current of 28 A, and an impact time of 2 s. The powder peeled off from the positive electrode current collector was collected and then the fine powder impurities with a particle size ≤1 μm were removed by an airflow separator with a wind speed of 18 m / s to obtain LiFePO4 powder with a particle size of 2-25 μm and a purity of 97.3%.

[0056] (3) Add 1200 mL of 0.2 mol / L lithium hydroxide aqueous solution, 1.2 g Ti(OC4H9)4 (Ti doping amount 1 mol%), and 0.5 g ZrOCl2・8H2O (Zr doping amount 0.5 mol%) to 100 g LiFePO4 powder, stir at 0℃ and 400 r / min for 30 min, then centrifuge at 8000 r / min for 15 min, and vacuum dry at 70℃ and -0.095 MPa for 3 h to obtain Ti / Zr co-doped lithium iron reconstructed powder with a Li / Fe molar ratio of 1.03 and a Li / Fe mixing degree of 1.2%;

[0057] (4) The Ti / Zr co-doped lithium iron reconstructed powder was mixed with 3 g of multi-walled carbon nanotubes with a diameter of 15 nm, 1 g of reduced graphene oxide with 3-5 layers, and 500 mL of anhydrous ethanol. The mixture was ultrasonically dispersed at 300 W for 30 min to obtain a suspension. Then, it was spray-dried with an inlet air temperature of 180℃, an outlet air temperature of 80℃, and an atomization pressure of 0.4 MPa to obtain composite powder.

[0058] (5) The composite powder was placed in a plasma-enhanced chemical vapor deposition apparatus, acetylene gas was introduced, and the mixture was treated at a vacuum of 120 W and 15 Pa for 8 min to obtain carbon nanotube / graphene modified composite powder with a carbon content of 4.1 wt.%.

[0059] (6) Under an argon atmosphere with a flow rate of 120 mL / min, the carbon nanotube / graphene modified composite powder was subjected to transient high-temperature impact treatment with a secondary pulse current: temperature 700℃, voltage 110 V, current 80 A, impact time 25 s, and after natural cooling, it was pulverized to D50=9.5 μm to obtain a fast-charging compatible cathode material.

[0060] Comparative Example 1

[0061] The commercially mature fast-charging lithium iron phosphate (non-recyclable) is manufactured by Shenzhen Defang Nanotechnology Co., Ltd., and its model number is DY-12.

[0062] Test case

[0063] 60Ah square wound cells were prepared using the fast-charging compatible cathode material from Example 1 and the lithium iron phosphate from Comparative Example 1, respectively. Except for the cathode material, all other variables were kept consistent. Specific design parameters are as follows: 4817389 aluminum shell, 78 winding layers, 9+3+2 coated separator, and cathode areal density of 0.201g / 1540mm². 2 The positive electrode compaction density is 2.20 g / cm³. 3 Negative electrode surface density: 0.100 g / 1540 mm² 2 The negative electrode compaction density is 1.40 g / cm³. 3 Specific preparation process: homogenization → coating → rolling → die cutting and slitting → winding → assembly → shell insertion → laser welding of cap → vacuum baking → liquid injection → formation → secondary liquid injection → sealing nail welding → volume division → testing → finished product.

[0064] The prepared battery cells were subjected to rate discharge tests under the following conditions: full charge to 3.65V at 1C / 2C / 4C / 6C / 8C / 10C. The test results are as follows: Figure 1 As shown, from Figure 1 As can be seen from the data, the battery cell charging capacity retention rate of Example 1 is comparable to that of Comparative Example 1, with an 8C charging capacity retention rate of 96%.

[0065] Figure 2 The charging temperature rise of Example 1 and Comparative Example 1 at different charging rates is shown. As can be seen from the figure, the charging surface temperature rise of Example 1 is slightly lower than that of Comparative Example 1.

[0066] Figure 3 The DC internal resistance (DCR) of 8C pulse charging at different SOCs at 25℃ is shown in the figure. It can be seen from the figure that the DCR of Example 1 and Comparative Example 1 are comparable at different SOCs, indicating that the introduction of heterogeneous elements can destroy the one-dimensional ion conduction channels of lithium iron phosphate, form a three-dimensional conduction network, and improve the ion conduction efficiency.

[0067] Figure 4 The figure shows the discharge capacity retention curves of the cells of Example 1 and Comparative Example 1 at 25°C after 8C charge / 8C discharge cycles. As can be seen from the figure, the capacity retention rate of Example 1 after 1000 cycles at 25°C and 1C is ≥90.0%, which is close to the performance of commercially mature fast-charging lithium iron phosphate (Comparative Example 1).

[0068] As can be seen from the above, the cathode material prepared by the method for recovering and regenerating fast-charging compatible cathode material from retired lithium iron phosphate batteries provided by this invention, especially the battery prepared from it, has an 8C charging capacity retention rate of ≥96% and a capacity retention rate of ≥90% after 1000 8C rate cycles. The total energy consumption of this method is 1.2-1.8 kWh / kg, which is more than 60% lower than traditional pyrometallurgical methods and 90% lower than hydrometallurgical methods. The fluorinated carbon coating formed by PVDF carbonization replaces the additional carbon source, increasing carbon utilization to 92% and achieving resource closed-loop management. The method for recovering and regenerating fast-charging compatible cathode material from retired lithium iron phosphate batteries provided by this invention has a total transient high-temperature shock time of less than 40 seconds during the pretreatment and crystallization stages, resulting in high production efficiency.

[0069] This invention achieves high-value regeneration of retired lithium iron phosphate (LFP) batteries through a four-step synergistic process: low-temperature flexible separation, precise lithium iron phosphate reconstruction, composite conductive modification, and short-range crystallization shaping. This method is applicable to the resource recycling of retired LFP batteries in fields such as electric vehicles and energy storage base stations, as well as the industrial production of high-power-density power battery cathode materials.

[0070] The above detailed description of a method for recovering and regenerating fast-charging-adaptive cathode material from retired lithium iron phosphate batteries, as well as a fast-charging-adaptive cathode material and a fast-charging battery, is illustrative rather than limiting. Several embodiments can be listed according to the defined scope. Therefore, variations and modifications without departing from the overall concept of the present invention should be within the protection scope of the present invention.

Claims

1. A method for recovering and regenerating fast-charging compatible cathode materials from retired lithium iron phosphate batteries, characterized in that, The method includes the following steps: (1) Discharge the retired lithium iron phosphate battery with constant current, and then disassemble and separate the positive electrode plate; (2) Under an inert atmosphere, the positive electrode sheet is subjected to plasma-assisted transient high-temperature impact treatment, the powder peeled off from the positive current collector is collected, and then fine powder impurities with a particle size ≤1 μm are removed to obtain LiFePO4 powder. (3) Add lithium hydroxide aqueous solution, tetrabutyl titanate and zirconium oxychloride to LiFePO4 powder, stir and react for 20-40 min, then centrifuge and dry to obtain Ti / Zr co-doped lithium iron reconstructed powder; (4) The Ti / Zr co-doped lithium iron reconstructed powder was mixed with multi-walled carbon nanotubes, reduced graphene oxide and anhydrous ethanol, and ultrasonically dispersed to obtain a suspension. Then, it was spray-dried to obtain composite powder. (5) Place the composite powder in a plasma-enhanced chemical vapor deposition apparatus, introduce acetylene gas, and perform vacuum treatment for 5-10 min to obtain carbon nanotube / graphene modified composite powder. (6) Under an inert atmosphere, the carbon nanotube / graphene modified composite powder is subjected to transient high-temperature impact treatment with a secondary pulse current, and then pulverized after natural cooling to obtain a fast-charging compatible cathode material.

2. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (1), the retired lithium iron phosphate battery is discharged to 1.8-2.0 V using a constant current of 0.5C.

3. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (2), the conditions for plasma-assisted transient high-temperature impact treatment are: peak temperature 400-500℃, pulse voltage 60-75 V, pulse current 25-30 A, and impact time 1-3 s; Fine powder impurities with a particle size ≤1 μm are removed by an airflow separator with a wind speed of 15-20 m / s.

4. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (3), the solid-liquid ratio of LiFePO4 powder to lithium hydroxide aqueous solution is 1 g: 10-15 mL, and the concentration of lithium hydroxide aqueous solution is 0.05-0.5 mol / L; the Ti doping amount in Ti / Zr co-doped lithium iron reconstructed powder is 0.5-2% of the molar amount of LiFePO4, and the Zr doping amount is 0.3-1% of the molar amount of LiFePO4.

5. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (4), the mass ratio of Ti / Zr co-doped lithium iron reconstructed powder to multi-walled carbon nanotubes and reduced graphene oxide is 100:1-5:0.5-1.5; the solid content of the suspension is 10-15 wt%.

6. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (5), the power of the plasma-enhanced chemical vapor deposition equipment is 100-150 W and the vacuum degree is 10-20 Pa.

7. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (6), the conditions for the transient high-temperature impact treatment with secondary pulse current are: peak temperature 650-750℃, pulse voltage 100-120 V, pulse current 70-90 A, and impact time 20-30 s.

8. The method for recovering and regenerating high-rate fast-charging compatible cathode materials from retired lithium iron phosphate batteries according to claim 1, characterized in that, In step (6), the particle size of the fast-charging compatible cathode material is 5-15 μm and the D50 is 8-10 μm.

9. A fast-charging compatible cathode material, characterized in that, The fast-charging compatible cathode material is prepared by the method described in any one of claims 1-8.

10. A fast-charging battery, characterized in that, The positive electrode material of the fast-charging battery is the fast-charging adapted positive electrode material as described in claim 9.

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