Method and device for reducing carbon content of lithium iron phosphate repair material and computer equipment

Abstract

The invention relates to a method and device for reducing the carbon content of a lithium iron phosphate repair material, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: putting positive electrode powder of a waste lithium iron phosphate pole piece into a cavity formed between electrode plates, introducing oxygen-containing gas into the positive electrode powder, and pressing the positive electrode powder; the electrode plate is electrified in an oxygen-containing environment, amorphous carbon is controlled to preferentially heat and be selectively oxidized by utilizing resistance difference of different carbon phases in positive electrode powder, and a conductive carbon phase is reserved; when it is monitored that the temperature of the positive electrode powder reaches a preset temperature threshold value, intermittently electrifying the electrode plate, and controlling the temperature of the positive electrode powder not to exceed the preset temperature threshold value; and continuously and intermittently electrifying until the content of the amorphous carbon is reduced to a target range. By adopting the method, amorphous carbon generated by PVDF decomposition can be selectively removed on the premise that lithium iron phosphate is not oxidized and a conductive network is not damaged.

Description

Technical Field

[0001] This application relates to the field of battery material processing technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for reducing the carbon content of lithium iron phosphate repair materials. Background Technology

[0002] With the rapid development of new energy vehicles, the number of retired lithium iron phosphate batteries has increased dramatically. To reduce resource waste and environmental pollution, the direct repair and regeneration of lithium iron phosphate cathode materials from spent batteries has become a hot topic in the industry.

[0003] Traditional technologies generally employ a "high-temperature oxidation calcination" route: the entire electrode is heated to over 500°C in air, oxidizing all carbon sources (carbon coating, conductive agent, and amorphous carbon produced by the decomposition of PVDF (polyvinylidene fluoride)) into CO2, thereby reducing the total carbon content. However, this process has the following drawbacks: it cannot distinguish between beneficial carbon (carbon coating, conductive agent) and harmful carbon (amorphous carbon from PVDF decomposition), leading to the destruction of the conductive network; and the Fe in the lithium iron phosphate lattice during high-temperature oxidation... 2+ Easily oxidized to Fe 3+ This process forms impurities such as Li3Fe2(PO4)3 and Fe2O3, requiring subsequent reduction steps, which are lengthy and energy-intensive. Moreover, the commonly used roller kilns or steel strip furnaces are all intermittent external heating systems with low thermal efficiency, making it difficult to achieve continuous production.

[0004] Therefore, there is an urgent need for a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for reducing the carbon content of lithium iron phosphate remediation materials, which can selectively remove amorphous carbon generated by PVDF decomposition without oxidizing lithium iron phosphate or damaging the conductive network. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for reducing the carbon content of lithium iron phosphate remediation materials that can selectively remove amorphous carbon generated by PVDF decomposition without oxidizing lithium iron phosphate or damaging the conductive network.

[0006] In a first aspect, this application provides a method for reducing the carbon content of lithium iron phosphate remediation materials, including:

[0007] The positive electrode powder from the waste lithium iron phosphate electrode sheet is placed in the cavity formed between the electrode plates, oxygen-containing gas is introduced into the positive electrode powder, and the positive electrode powder is compressed.

[0008] By applying current to the electrode plate in an oxygen-containing environment, the resistance difference of different carbon phases in the positive electrode powder is utilized to control the amorphous carbon to be preferentially heated and selectively oxidized, while retaining the conductive carbon phase.

[0009] When the temperature of the positive electrode powder is detected to reach a preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold.

[0010] Continuous intermittent energizing continues until the content of amorphous carbon decreases to the target range.

[0011] In one embodiment, the cavity formed between the electrode plates, where the positive electrode powder from the waste lithium iron phosphate electrode sheet is placed, further includes:

[0012] The waste lithium iron phosphate electrode sheets are stripped by anaerobic pyrolysis or water stripping, and the resulting lithium iron phosphate positive electrode powder is crushed until the particle size of the crushed positive electrode powder is within a preset particle size range.

[0013] In one embodiment, the process of introducing oxygen-containing gas into the positive electrode powder and compacting the positive electrode powder includes:

[0014] The positive electrode powder is placed in a vacuum environment to perform gas desorption, wherein the gas desorption time is determined based on the surface area and porosity of the positive electrode powder.

[0015] Oxygen-containing gas is introduced into the positive electrode powder to allow the positive electrode powder to adsorb oxygen, wherein the amount of oxygen adsorbed is sufficient to oxidize amorphous carbon but insufficient to oxidize lithium iron phosphate.

[0016] The electrode plate is placed in an environment with an oxygen content lower than a preset value, and the positive electrode powder is compressed.

[0017] In one embodiment, the intermittent energization of the electrode plate includes:

[0018] Based on the temperature of the positive electrode powder, the duty cycle and duration of the current are adjusted, and the electrode plate is intermittently energized using a pulse energizing method.

[0019] Secondly, this application also provides a device for reducing the carbon content of lithium iron phosphate remediation materials, comprising:

[0020] The frame, electrode plate, lifting mechanism, limit plate, control unit, power module, guide rail, and feeding mechanism that reciprocates along the guide rail;

[0021] The electrode plate includes a cathode plate and an anode plate, with the cathode plate fixed to the bottom of the frame; the spreading head of the feeding mechanism is used to evenly spread the positive electrode powder on the cathode plate;

[0022] When the positive electrode powder is being spread, the anode plate is placed on a limiting plate on one side of the cathode plate via the lifting mechanism; after the positive electrode powder is spread, the anode plate is placed above the cathode plate via the lifting mechanism, and a cavity for accommodating the positive electrode powder is formed between the anode plate and the cathode plate.

[0023] The anode plate and the cathode plate are respectively electrically connected to the power module, and are used to apply a preset voltage to the positive electrode powder;

[0024] The cathode plate or the anode plate is equipped with a temperature probe, which is signal-connected to the control unit. The control unit is used to control the power module to be intermittently powered when the temperature of the positive electrode powder reaches a preset temperature threshold.

[0025] In one embodiment, the lifting mechanism includes a servo motor, a ball screw, and a guide rod. The servo motor is fixed to the end of the guide rail, and the output shaft of the servo motor is connected to the ball screw via a coupling. The anode plate is threadedly connected to the ball screw and slides in cooperation with the guide rod.

[0026] In one embodiment, the feeding mechanism includes a hopper, a feeding pipe, and a linear module. The outlet of the hopper is connected to the inlet of the feeding pipe via a hose, and the outlet of the feeding pipe is connected to the spreading head. The spreading head is mounted on the linear module via a slider, and the linear module is fixed to the top of the frame parallel to the guide rail.

[0027] In one embodiment, the device further includes a vacuum module, one end of which is connected to a vacuum pump, and the other end is connected to a cavity formed by the anode plate and the cathode plate via a solenoid valve. The solenoid valve is electrically connected to the control unit.

[0028] In one embodiment, the device further includes an ultrasonic vibration module, the ultrasonic transducer of which is fixed to the upper surface of the anode plate, and the amplitude transformer of which extends into the cavity to provide ultrasonic vibration during the feeding and unloading stages.

[0029] In one embodiment, the device further includes a discharge mechanism, which includes a tilting motor, a discharge shaft, and a discharge baffle. The discharge shaft is fixedly connected to the cathode plate. The tilting motor drives the discharge shaft to rotate via a coupling, causing the cathode plate to tilt to complete the discharge. The discharge baffle is hinged to the edge of the cathode plate.

[0030] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0031] The positive electrode powder from the waste lithium iron phosphate electrode sheet is placed in the cavity formed between the electrode plates, oxygen-containing gas is introduced into the positive electrode powder, and the positive electrode powder is compressed.

[0032] By applying current to the electrode plate in an oxygen-containing environment, the resistance difference of different carbon phases in the positive electrode powder is utilized to control the amorphous carbon to be preferentially heated and selectively oxidized, while retaining the conductive carbon phase.

[0033] When the temperature of the positive electrode powder is detected to reach a preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold.

[0034] Continuous intermittent energizing continues until the content of amorphous carbon decreases to the target range.

[0035] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0036] The positive electrode powder from the waste lithium iron phosphate electrode sheet is placed in the cavity formed between the electrode plates, oxygen-containing gas is introduced into the positive electrode powder, and the positive electrode powder is compressed.

[0037] By applying current to the electrode plate in an oxygen-containing environment, the resistance difference of different carbon phases in the positive electrode powder is utilized to control the amorphous carbon to be preferentially heated and selectively oxidized, while retaining the conductive carbon phase.

[0038] When the temperature of the positive electrode powder is detected to reach a preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold.

[0039] Continuous intermittent energizing continues until the content of amorphous carbon decreases to the target range.

[0040] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0041] The positive electrode powder from the waste lithium iron phosphate electrode sheet is placed in the cavity formed between the electrode plates, oxygen-containing gas is introduced into the positive electrode powder, and the positive electrode powder is compressed.

[0042] By applying current to the electrode plate in an oxygen-containing environment, the resistance difference of different carbon phases in the positive electrode powder is utilized to control the amorphous carbon to be preferentially heated and selectively oxidized, while retaining the conductive carbon phase.

[0043] When the temperature of the positive electrode powder is detected to reach a preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold.

[0044] Continuous intermittent energizing continues until the content of amorphous carbon decreases to the target range.

[0045] The aforementioned method, apparatus, computer equipment, computer-readable storage medium, and computer program product for reducing the carbon content of lithium iron phosphate remediation materials involve placing positive electrode powder obtained from waste lithium iron phosphate electrode sheets into a cavity between two electrode plates, first compressing it and then introducing oxygen-containing gas, followed by energizing the electrode plates. Utilizing the resistance difference between amorphous carbon and conductive carbon phases, the former is preferentially heated and selectively oxidized, while the latter remains intact. Simultaneously, a temperature probe monitors the powder temperature in real time. Once a preset threshold is reached, intermittent pulse power supply is switched to lock the temperature below the threshold until the amorphous carbon content is reduced to the target range. Throughout the process, the lithium iron phosphate lattice remains unoxidized, eliminating the need for subsequent reduction; the self-heating powder replaces external kilns, reducing energy consumption by over 50%; the compact device can seamlessly integrate with existing recycling lines, achieving continuous, efficient, and low-loss carbon removal and regeneration of waste electrode sheets. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart illustrating a method for reducing carbon content using lithium iron phosphate remediation materials in one embodiment.

[0048] Figure 2 This is a flowchart illustrating a method for reducing carbon content using lithium iron phosphate remediation materials in another embodiment.

[0049] Figure 3 A front view and a left view of the first structure of a device for reducing carbon content using lithium iron phosphate remediation material in one embodiment;

[0050] Figure 4 Left views of the second and third structures of a device for reducing carbon content using lithium iron phosphate remediation material in one embodiment;

[0051] Figure 5 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0052] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0053] In the direct repair and regeneration process of waste lithium iron phosphate electrodes, regardless of whether the electrodes have undergone electrolyte injection (i.e., "injected" or "uninjected"), the resulting recycled material faces the problem of high carbon content. The carbon source mainly consists of three parts:

[0054] ① Carbon coating layer is used to improve the conductivity of lithium iron phosphate particles; ② Amorphous carbon generated by the thermal decomposition of PVDF (polyvinylidene fluoride) binder; ③ Conductive agent (such as carbon black, graphite).

[0055] Traditional processes employ high-temperature oxidation calcination, using roller kilns or steel belt furnaces to oxidize all carbon sources into carbon dioxide in an air atmosphere to achieve carbon removal. However, this method cannot distinguish between beneficial carbon (carbon coating and conductive agent) and harmful carbon (PVDF amorphous carbon), leading to the destruction of the conductive network. Simultaneously, the high-temperature oxidation process inevitably removes Fe from the lithium iron phosphate lattice. 2+ Oxidized to Fe 3+ This process generates impurities such as Li3Fe2(PO4)3 and Fe2O3, which reduces the electrochemical performance of the material. Subsequent additional reduction processes are required, resulting in a lengthy and energy-intensive process.

[0056] In an exemplary embodiment, Figure 1 As shown, a method for reducing the carbon content of a lithium iron phosphate remediation material is provided, comprising the following steps S102 to S106. Wherein:

[0057] Step S102: Place the positive electrode powder from the waste lithium iron phosphate electrode sheet into the cavity formed between the electrode plates, introduce oxygen-containing gas into the positive electrode powder, and compact the positive electrode powder.

[0058] Specifically, two conductive electrode plates (anode and cathode plates) are arranged opposite each other, with the space between them forming a process cavity. Flexible sealing rings or baffles can be installed around the cavity to ensure that subsequent gas only contacts the powder, preventing leakage. The positive electrode powder is uniformly filled into the cavity; the filling amount should ideally result in a final compacted thickness of 0.5–2 cm. A lifting mechanism drives the upper electrode plate downwards, applying a preset mechanical pressure to the powder to achieve a predetermined powder layer density, ensuring a stable current path and uniform heating during subsequent energization. The compaction force is adjusted in real-time by the control unit based on the loose powder density. Under compaction, oxygen-containing gas (air, pure oxygen, or an oxygen-nitrogen mixture) is introduced into the cavity through the air inlet channel. The gas flow rate and introduction time are controlled by the control unit according to a preset program. The gas first fills the powder pores, and then the excess is removed through a secondary vacuum, retaining only a limited amount of oxygen adsorbed by amorphous carbon, providing reactants for subsequent selective oxidation.

[0059] Step S104: The electrode plate is energized in an oxygen-containing environment. By utilizing the resistance difference of different carbon phases in the positive electrode powder, the amorphous carbon is preferentially heated and selectively oxidized, while retaining the conductive carbon phase.

[0060] Specifically, the positive electrode powder is compressed to form a continuous conductive network, which is sandwiched between the anode plate and the cathode plate; the power module applies a 50-500V DC or pulse voltage to the entire powder layer through the electrode plate.

[0061] Amorphous carbon is produced by the pyrolysis of PVDF; it is loose and porous, with a low degree of graphitization and a high resistivity ρ_amorphous. The conductive carbon phase includes a carbon coating layer and graphite / carbon nanotubes; it is highly graphitized and has a low resistivity ρ_conductive (ρ_amorphous is much greater than ρ_conductive). According to Joule's law, Q = I... 2 For the same current R, amorphous carbon with high resistance generates more heat per unit volume and its temperature rises faster.

[0062] When the temperature probe detects that the powder temperature has reached the preset value (approximately 500℃), the control unit switches to intermittent pulse power to maintain this temperature range. Amorphous carbon has reached its oxidation initiation temperature, and the limited oxygen pre-adsorbed within the powder preferentially reacts with it, generating CO / CO2 which is then removed. Conductive carbon, due to its low heating rate and temperature lag, and the slow oxidation kinetics of graphite at 500℃, is completely preserved because oxygen is insufficient to significantly oxidize it within a limited time.

[0063] After the process is completed, the total carbon content in the cathode powder decreases, but the conductive network (carbon coating layer + graphite / carbon nanotubes) is not destroyed, and the lithium iron phosphate lattice is not damaged by oxidation, achieving selective carbon removal that "removes the harm and retains the benefit".

[0064] Step S106: When the temperature of the positive electrode powder is detected to reach the preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold; the intermittent energization continues until the content of amorphous carbon decreases to the target range.

[0065] Specifically, the temperature closed-loop control system uses a temperature probe embedded in the electrode plate to collect the powder temperature in real time, and the signal is fed back to the control unit. When the temperature is greater than or equal to a preset threshold (e.g., 500℃), the control unit immediately switches to an "intermittent power-on" mode—that is, periodically turning the power on and off. By adjusting the duty cycle, the average powder temperature is kept below the threshold, achieving precise temperature control. Around 500℃ is a "window temperature" where amorphous carbon reacts rapidly with adsorbed oxygen, while graphite conductive agents and lithium iron phosphate maintain a stable temperature. Intermittent power supply provides the energy required for the reaction while avoiding continuous heating that could lead to oxidation of the conductive agent or lattice damage.

[0066] The control unit determines the reaction endpoint based on real-time carbon content detection (or a preset time-temperature integral model); when the detected value is ≤ the target range, intermittent power supply is stopped, and selective carbon removal is completed. The entire process operates in a closed loop within a preset temperature threshold until amorphous carbon is quantitatively removed.

[0067] In the aforementioned method for reducing the carbon content of lithium iron phosphate remediation materials, the positive electrode powder obtained from waste lithium iron phosphate electrode sheets is placed in a cavity between two electrode plates. It is first compressed and oxygen-containing gas is introduced. Then, the electrode plates are energized. Utilizing the resistance difference between amorphous carbon and conductive carbon phases, the former is preferentially heated and selectively oxidized, while the latter remains intact. Simultaneously, a temperature probe monitors the powder temperature in real time. Once a preset threshold is reached, intermittent pulse power supply is switched to lock the temperature below the threshold until the amorphous carbon content is reduced to the target range. Throughout the process, the lithium iron phosphate lattice remains unoxidized, eliminating the need for subsequent reduction. The self-heating powder replaces external kilns, reducing energy consumption by over 50%. The compact device can seamlessly integrate with existing recycling lines, achieving continuous, efficient, and low-loss carbon removal and regeneration of waste electrode sheets.

[0068] In one embodiment, the cavity formed between the electrode plates, where the positive electrode powder from the recycled lithium iron phosphate electrode sheet is placed, further includes:

[0069] Waste lithium iron phosphate electrodes are stripped by anaerobic pyrolysis or water stripping. The resulting lithium iron phosphate cathode powder is then crushed until the particle size of the crushed cathode powder is within a preset range.

[0070] Specifically, before "filling the positive electrode powder into the electrode plate cavity", the following continuous pretreatment process must be completed:

[0071] 1. Electrode peeling: 1.1. Anaerobic pyrolysis peeling: Waste lithium iron phosphate electrodes are pyrolyzed in an inert atmosphere furnace at 400–500℃ to decompose and deactivate the binder, and the electrode separates naturally from the aluminum foil; 1.2. Water peeling: Water is used as a solvent, and the swelling / dissolving properties of the water-based carbon coating binder are utilized to achieve gentle separation of the electrode and aluminum foil without breaking the aluminum foil and with low aluminum impurity content.

[0072] 2. Degumming (water stripping route only): The cathode powder after water stripping still contains PVDF and needs to be degummed by oxygen-free heat to prevent subsequent crushing difficulties and excessively high coating viscosity.

[0073] 3. Crushing: The lithium iron phosphate cathode powder obtained after stripping (and degumming) is fed into a crushing device and crushed until D50 is within the preset particle size range (≤10μm) to obtain sufficient specific surface area and uniform resistance distribution, so as to meet the requirements of subsequent selective oxidation for heat transfer, mass transfer and current path.

[0074] In this embodiment, the waste electrode sheet and aluminum foil are first efficiently separated by anaerobic pyrolysis or water stripping, and then degummed and crushed to a preset particle size to obtain high-purity, ultrafine lithium iron phosphate cathode powder. This pretreatment not only reduces the aluminum impurity content, but also lays a uniform conductivity and heat transfer foundation for the subsequent selective oxidation based on resistance difference in the electrode plate cavity, ultimately ensuring that amorphous carbon is accurately removed while the conductive network and lithium iron phosphate lattice remain intact.

[0075] In one embodiment, such as Figure 2 As shown, the process of introducing oxygen-containing gas into the positive electrode powder and compacting the positive electrode powder includes:

[0076] Step S202: Place the positive electrode powder in a vacuum environment and perform gas desorption on the positive electrode powder. The duration of gas desorption is determined based on the surface area and porosity of the positive electrode powder.

[0077] Step S204: Introduce oxygen-containing gas into the positive electrode powder to allow the positive electrode powder to adsorb oxygen. The amount of oxygen adsorbed is sufficient to oxidize amorphous carbon but insufficient to oxidize lithium iron phosphate.

[0078] Step S206: Place the electrode plate in an environment with an oxygen content lower than a preset value and compact the positive electrode powder.

[0079] Specifically, negative pressure is applied to the positive electrode powder within a vacuum chamber to remove air, water vapor, and volatile organic compounds adsorbed on its surface and within its pores; the duration is t = k × S / Vp (where k is an empirical coefficient, S is the BET specific surface area, and Vp is the pore volume). This step thoroughly removes air, water vapor, and volatile organic compounds adsorbed on the powder surface and within its pores, providing a "blank substrate" for subsequent quantitative oxygen absorption.

[0080] Oxygen-containing gas (oxygen content ≥60%) is introduced into the cavity at room temperature or low temperature (<80℃) to introduce the desorbed powder. The flow rate and time are controlled to ensure that oxygen is fully adsorbed only by the amorphous carbon with high specific surface area. The total adsorption is limited to a safe range that is "sufficient to oxidize amorphous carbon, but insufficient to oxidize lithium iron phosphate during subsequent heating." Because the amorphous carbon produced by PVDF decomposition is loose and porous, it adsorbs more oxygen. The conductive agent SP is spherical graphite, and graphite is much more stable than amorphous carbon at 500℃, so amorphous carbon is preferentially oxidized. However, amorphous carbon has stronger reducing properties than lithium iron phosphate, so lithium iron phosphate will not oxidize when oxygen is insufficient.

[0081] After oxygen adsorption is complete, the environment around the electrode plates is immediately switched to an inert or low-oxygen atmosphere with an oxygen concentration below a preset value (e.g., ≤1 vol%), and then mechanical pressure is applied to the powder. This environment prevents excessive oxygen from causing subsequent non-selective oxidation and ensures uniform powder layer density and a stable current path, creating precise conditions for subsequent resistive selective oxidation to remove carbon. When the current generates heat, causing the amorphous carbon in the positive electrode powder to react with the adsorbed oxygen, it is crucial to prevent oxygen from entering the electrode plate space, as this would lead to the complete reaction of the amorphous carbon followed by the oxidation of lithium iron phosphate. For example, the thickness of the positive electrode powder is controlled at 0.5–2 cm, and the electrode plates are pressed tightly against the positive electrode powder with a certain pressure (pressure controlled at 0.3–0.5 MPa). The electrode plates are preferably made of titanium or gold-plated copper. A temperature probe is installed on the inner surface of the electrode plates.

[0082] In this embodiment, by first vacuum desorption and then quantitative oxygen absorption, and finally compaction in a low-oxygen environment, the oxygen content inside the powder can be precisely controlled so that it only meets the needs of selective oxidation of amorphous carbon in PVDF. This avoids excessive oxygen causing oxidation of lithium iron phosphate and conductive agents, and ensures that the powder layer is dense and uniform, laying the foundation for subsequent efficient, precise, and low-loss carbon removal.

[0083] In one embodiment, intermittently energizing the electrode plates includes:

[0084] Based on the temperature of the positive electrode powder, the duty cycle and duration of the current are adjusted, and the electrode plate is intermittently energized using a pulse energizing method.

[0085] Specifically, the temperature probe feeds back the powder temperature T to the control unit in real time. If T < a preset threshold (500℃), the control unit increases the duty cycle (power-on time / cycle); if T ≥ 500℃, the duty cycle decreases or even the power is cut off briefly, ensuring that the average powder temperature remains within a window of 500℃ ± 10℃. Duty cycle D = t on / (t on +t off The voltage can be steplessly adjusted between 10% and 90%; the pulse period is 0.5-10s, and the peak voltage is 50-500V; the duration is automatically terminated by online detection of carbon content or by a preset time-temperature integral model.

[0086] In this embodiment, pulsed power supply provides the instantaneous high temperature required for the oxidation of amorphous carbon, while avoiding overall overheating through "power-off heat dissipation," ensuring that lithium iron phosphate and conductive agent are not oxidized, thus achieving efficient, precise, and low-consumption selective carbon removal.

[0087] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0088] Based on the same inventive concept, this application also provides an apparatus for reducing the carbon content of lithium iron phosphate remediation materials to achieve the method for reducing the carbon content of lithium iron phosphate remediation materials described above. The solution provided by this apparatus is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the apparatus for reducing the carbon content of lithium iron phosphate remediation materials provided below can be found in the limitations of the method for reducing the carbon content of lithium iron phosphate remediation materials described above, and will not be repeated here.

[0089] In an exemplary embodiment, Figure 3 and Figure 4 As shown, a device for reducing the carbon content of lithium iron phosphate remediation material is provided, including: a frame, an electrode plate, a lifting mechanism, a limiting plate, a control unit, a power module, a guide rail, and a feeding mechanism that reciprocates along the guide rail;

[0090] The electrode plate includes a cathode plate and an anode plate, with the cathode plate fixed to the bottom of the frame; the spreading head of the feeding mechanism is used to spread the positive electrode powder evenly on the cathode plate;

[0091] During the spreading of positive electrode powder, the anode plate is placed on the limiting plate on one side of the cathode plate through a lifting mechanism; after the spreading of positive electrode powder is completed, the anode plate is placed above the cathode plate through a lifting mechanism, and a cavity for containing positive electrode powder is formed between the anode plate and the cathode plate.

[0092] The anode plate and cathode plate are electrically connected to the power module to apply a preset voltage to the positive electrode powder.

[0093] The cathode plate or anode plate is equipped with a temperature probe, which is connected to the control unit. The control unit is used to control the power module to be energized intermittently when the temperature of the positive electrode powder reaches a preset temperature threshold.

[0094] Specifically, the main components and their connections:

[0095] 1. Rack:

[0096] Structural components: Provides support and a fixed foundation for the entire device.

[0097] Connection relationship: The frame is equipped with guide rails to guide the movement of the lifting mechanism and the feeding mechanism.

[0098] 2. Electrode plates:

[0099] Cathode plate: Fixed to the bottom of the frame, serving as the bearing surface for the positive electrode powder.

[0100] Anode plate: It is connected to the frame via a lifting mechanism and can move up and down.

[0101] Connection relationship: The cathode plate and anode plate are electrically connected to the power module respectively, which is used to apply a preset voltage to the positive electrode powder.

[0102] 3. Lifting mechanism:

[0103] Structural components: Includes hydraulic cylinders, guide beams, etc., used to control the lifting and lowering of the anode plates.

[0104] Connection relationship: The hydraulic cylinder is connected to the anode plate, and the guide rail beam is fixed on the frame to guide the lifting and lowering movement of the anode plate.

[0105] 4. Limit plate:

[0106] Structural components: Used to limit the lifting and lowering position of the anode plate.

[0107] Connection relationship: Installed on the frame and used in conjunction with the lifting mechanism.

[0108] 5. Control Unit:

[0109] Structural composition: An integrated electronic control module is used to control the operation of the entire device.

[0110] Connection relationship: Electrically connected to temperature probe, power module, lifting mechanism, etc., to achieve automated control.

[0111] 6. Power supply module:

[0112] Structural components: Power supply device that provides DC or pulse voltage.

[0113] Connection relationship: It is electrically connected to the cathode plate and the anode plate respectively, providing energy for the positive electrode powder to be energized.

[0114] 7. Guide rail:

[0115] Structural components: Tracks arranged along the length of the frame.

[0116] Connection relationship: The feeding mechanism moves back and forth along the guide rail to realize the material spreading operation.

[0117] 8. Feeding mechanism:

[0118] Spreading head: Used to evenly spread the positive electrode powder on the cathode plate.

[0119] Feeding pipe: connects the hopper and the spreading head, and is used to transport positive electrode powder.

[0120] Connection relationship: The material spreading head is connected to the feeding pipe, and the feeding pipe is connected to the silo to realize powder conveying.

[0121] 9. Temperature probe:

[0122] Structural components: A sensor used to measure the temperature of the positive electrode powder.

[0123] Connection relationship: Installed on the cathode plate or anode plate, and connected to the control unit for signal transmission.

[0124] The entire process is as follows: During the feeding stage, the positive electrode powder is conveyed to the spreading head through the feeding pipe. The spreading head moves along the guide rail, evenly spreading the positive electrode powder onto the cathode plate fixed at the bottom of the frame. While the positive electrode powder is being spread, the anode plate is positioned on a limiting plate on one side of the cathode plate via a lifting mechanism to avoid interference. During the compaction and heating stage, after spreading, the anode plate moves from the limiting plate position to above the cathode plate via the lifting mechanism, forming a closed cavity. The cathode and anode plates are respectively connected to the power module to provide energy for the positive electrode powder. A temperature probe is installed on either the cathode or anode plate to monitor the temperature of the positive electrode powder in real time. When the temperature reaches a preset threshold, the control unit controls the power module to intermittently energize to maintain the temperature of the positive electrode powder and promote the selective oxidation of amorphous carbon. During the unloading stage, after heating, the anode plate rises and the unloading baffle falls. Ultrasonic vibration is activated, and simultaneously, the unloading shaft rotates 90° clockwise to unload the processed positive electrode powder. After unloading is completed, the ultrasonic equipment is turned off, the cathode plate is returned to its original position, and preparations are made for the processing of the next batch of materials.

[0125] In one embodiment, the lifting mechanism includes a servo motor, a ball screw, and a guide rod. The servo motor is fixed to the end of the guide rail, and the output shaft of the servo motor is connected to the ball screw via a coupling. The anode plate is threadedly connected to the ball screw and slides with the guide rod.

[0126] Specifically, the servo motor and ball screw: The output shaft of the servo motor is connected to the ball screw via a coupling. This connection transmits torque and allows the ball screw to rotate, thereby pushing or pulling the threaded anode plate. The threaded connection between the ball screw and the anode plate means that the rotation of the ball screw directly drives the anode plate to move up and down. The threaded connection provides precise displacement control, ensuring that the anode plate can be accurately positioned at the required height. The anode plate slides on the guide rod, allowing the anode plate to move smoothly on the guide rod while maintaining correct alignment and parallelism, ensuring the sealing and operational precision of the entire device.

[0127] The lifting mechanism directly controls the position of the anode plate within the entire device, thus affecting the loading, compaction, and heating processes of the cathode powder. By controlling the descent of the anode plate, the compaction degree of the cathode powder layer can be precisely controlled, which is crucial for subsequent heating and reaction. Precise positioning of the anode plate ensures a seal between it and the cathode plate, preventing gas leakage, which is essential for controlling the reaction atmosphere and improving reaction efficiency. The use of a servo motor allows for automated control of the entire lifting process, improving operational accuracy and repeatability, and reducing human error.

[0128] In one embodiment, the feeding mechanism includes a hopper, a feeding pipe, and a linear module. The outlet of the hopper is connected to the inlet of the feeding pipe via a hose, and the outlet of the feeding pipe is connected to a spreading head. The spreading head is mounted on the linear module via a slider, and the linear module is fixed to the top of the frame parallel to the guide rail.

[0129] Specifically, the hopper stores the cathode powder to be processed and is fixed in a suitable position on the frame for easy feeding into the feeding pipe. The feeding pipe transports the cathode powder, and the hopper outlet is connected to the feeding pipe inlet via a hose. The feeding pipe outlet is connected to the spreading head. The spreading head is the device used to evenly spread the cathode powder onto the cathode plate. It is mounted on a linear module via a slider and can move along the linear module. The linear module includes guide rails and a slider to guide the spreading head to move in a specific direction. It is fixed to the top of the frame parallel to the guide rails, and the spreading head moves on the linear module via the slider.

[0130] The working process is as follows: Positive electrode powder enters the feeding pipe from the hopper through a flexible hose, ready to be transported to the cathode plate. The feeding pipe then delivers the positive electrode powder to the spreading head. The spreading head moves along a linear module on the cathode plate, evenly spreading the positive electrode powder. The movement of the spreading head is controlled by the linear module to ensure uniformity and accuracy of spreading. After spreading is complete, the spreading head moves to the designated position, ready for the next step of compaction and heating.

[0131] In this embodiment, the uniform spreading of the positive electrode powder on the cathode plate is achieved through the movement of the spreading head and the feeding pipe, providing a uniform foundation for subsequent compaction and heating. The movement control of the linear module ensures the accuracy of the spreading process, avoiding uneven thickness or material waste. The entire feeding process can be automated, improving operational efficiency and repeatability.

[0132] In one embodiment, the device further includes a vacuum module, one end of which is connected to a vacuum pump, and the other end is connected to a cavity formed by an anode plate and a cathode plate via a solenoid valve. The solenoid valve is electrically connected to a control unit.

[0133] Specifically, a vacuum pump creates a vacuum environment and extracts gas from a cavity; it typically includes components such as a pump body, motor, and valves. A vacuum pipeline connects the vacuum pump and the cavity, transporting the gas; it is usually made of pressure-resistant and corrosion-resistant materials, such as stainless steel tubing. A solenoid valve controls the flow of gas between the vacuum pipeline and the cavity, including an electromagnetic coil, valve body, and seals. The control unit, based on process requirements, controls the opening and closing of the solenoid valve, thereby controlling the operating status of the vacuum pump; it includes control circuitry and signal interfaces.

[0134] Connection: The outlet of the vacuum pump is connected to the solenoid valve through a vacuum pipe to form a vacuum channel. The other end of the solenoid valve is connected to the cavity formed by the anode plate and the cathode plate to control the gas exchange between the cavity and the outside. The solenoid valve is electrically connected to the control unit through wires to receive instructions from the control unit and realize automatic control.

[0135] Workflow:

[0136] During the vacuuming phase, the control unit sends a signal to the solenoid valve according to the process flow, causing the solenoid valve to open. The vacuum pump starts, extracting gas from the chamber through the vacuum pipeline and reducing the pressure inside the chamber. During the gas desorption phase, under vacuum conditions, gases and volatiles on the surface of the positive electrode powder are removed, preparing for subsequent oxygen adsorption and heating treatment. By adjusting the opening and closing of the solenoid valve by the control unit, the gas environment inside the chamber can be precisely controlled, such as introducing oxygen or nitrogen at specific stages. The entire vacuuming process is automatically controlled by the control unit, ensuring the accuracy and repeatability of the process.

[0137] In this embodiment, gases and volatiles on the surface of the cathode powder are removed under vacuum conditions, improving the efficiency and effectiveness of subsequent processes. Precise control of the solenoid valve's opening and closing allows for precise control of the gas environment within the chamber, providing a suitable environment for cathode powder processing. The entire vacuuming process can be automated, improving operational efficiency and repeatability while reducing human error.

[0138] In one embodiment, the device further includes an ultrasonic vibration module, the ultrasonic transducer of which is fixed to the upper surface of the anode plate, and the amplitude transformer of which extends into the cavity to provide ultrasonic vibration during the feeding and unloading stages.

[0139] Specifically, an ultrasonic transducer (ultrasonic generator) is a device that converts electrical energy into mechanical vibration energy. It typically contains a piezoelectric ceramic element that generates high-frequency vibrations, which are transmitted to the positive electrode powder via an amplitude transformer. The amplitude transformer connects the ultrasonic transducer to the rods inside the cavity and is used to transmit vibration energy, effectively transferring the vibration energy generated by the ultrasonic transducer to the positive electrode powder layer.

[0140] Connection relationship: The ultrasonic transducer is fixed on the upper surface of the anode plate, and the amplitude transformer extends from the ultrasonic transducer and directly into the cavity to ensure that the vibration energy can be directly applied to the positive electrode powder.

[0141] Workflow:

[0142] During the feeding stage, the ultrasonic vibration module is activated when the positive electrode powder is spread onto the cathode plate through the feeding mechanism's spreading head. Ultrasonic vibration helps to achieve uniform distribution and compaction of the powder, reducing voids between powder particles and increasing packing density.

[0143] During the unloading stage, after the heat treatment is completed, the ultrasonic vibration module is activated again when the reacted cathode powder needs to be unloaded from the cathode plate. Ultrasonic vibration helps to loosen and separate the powder, making it easier for it to slide off the cathode plate and facilitate collection by the unloading mechanism.

[0144] In this embodiment, ultrasonic vibration promotes uniform powder distribution on the cathode plate, preventing powder accumulation and unevenness. Vibration compaction increases the density of the powder layer, which is beneficial for subsequent heating and reaction processes. Ultrasonic vibration also aids in powder removal, reducing powder adhesion to the cathode plate and improving unloading efficiency. The ultrasonic vibration module can be integrated with the overall automated control system of the device for precise control.

[0145] In one embodiment, the device further includes a discharge mechanism, which includes a tilting motor, a discharge shaft, and a discharge baffle. The discharge shaft is fixedly connected to the cathode plate. The tilting motor drives the discharge shaft to rotate through a coupling, causing the cathode plate to tilt to complete the discharge. The discharge baffle is hinged to the edge of the cathode plate.

[0146] Specifically, a tilting motor is a type of motor that provides rotational power, typically used to drive mechanical components in reciprocating motion. It provides power to drive the unloading shaft to rotate via a coupling. The unloading shaft connects the tilting motor and the rotating shaft of the cathode plate, transmitting the rotational motion of the tilting motor to the cathode plate, thus achieving the tilting of the cathode plate.

[0147] The discharge baffle is a movable plate used to catch the positive electrode powder falling from the cathode plate during the discharge process, preventing the positive electrode powder from splashing everywhere during the discharge process, ensuring a clean environment and facilitating the collection of powder.

[0148] Connection: The tilting motor is connected to the unloading shaft via a coupling, which can be rigid or flexible to accommodate misalignment or vibration. The unloading shaft is fixedly connected to the cathode plate, either by direct welding or through a bearing housing, ensuring the cathode plate can rotate around the shaft. The unloading baffle is hinged to the edge of the cathode plate, typically via a hinge or similar mechanism, to facilitate its opening and closing.

[0149] Workflow: After heat treatment, the control unit issues a discharge command. The tilting motor starts, driving the cathode plate to rotate around a fixed point via the discharge shaft. The cathode plate tilts to a certain angle (usually 90° or greater), allowing the positive electrode powder to detach from the cathode plate under gravity. The discharge baffle opens to catch the falling positive electrode powder. The positive electrode powder lands on the discharge baffle, facilitating subsequent collection and processing. After discharge, the tilting motor reverses, and the cathode plate returns to its original position, ready for the next feeding. The entire discharge process is automatically controlled by the control unit, ensuring operational accuracy and repeatability.

[0150] In this embodiment, rapid and efficient unloading is achieved through the rotation of the cathode plate and the coordination of the unloading baffle. This prevents the cathode powder from splashing everywhere during unloading, maintaining a clean working environment. It also facilitates the subsequent collection, packaging, or further processing of the processed cathode powder. The entire unloading process can be automated, improving operational efficiency and safety.

[0151] In other embodiments, such as Figure 3 and Figure 4 As shown, the device also includes:

[0152] A sealed outer casing, surrounding the cathode and anode plates, forms a closed or semi-closed cavity. This ensures a stable gas environment within the cavity during processing, preventing external gases from entering or leaking from the cavity.

[0153] The discharge valve, located at the bottom of the sealed housing, is used to control the discharge of the positive electrode powder. It opens during the discharge phase to allow the processed positive electrode powder to be smoothly discharged from the chamber.

[0154] An oxygen pipeline is a conduit connecting an external oxygen source to a cavity, used to deliver oxygen into the cavity. Oxygen is supplied to the cavity as needed for oxidation reactions.

[0155] A spring cylinder is an actuator that provides power to rotate the unloading shaft. It typically consists of a spring and a cylinder. During the unloading phase, it provides power to flip the cathode plate, completing the unloading process.

[0156] In summary, the overall working process of the device for reducing carbon content using lithium iron phosphate remediation materials is as follows:

[0157] 1. Electrode pretreatment:

[0158] Waste lithium iron phosphate electrodes are stripped by anaerobic pyrolysis or water stripping.

[0159] Anaerobic pyrolysis peeling: Under the protection of inert gas, the high temperature treatment at 400℃~500℃ causes the adhesive to decompose and become ineffective, thus achieving the peeling of the electrode sheet from the aluminum foil.

[0160] Water stripping: Using water-soluble or swelling water-based binders to separate the electrode sheet from the aluminum foil.

[0161] The positive electrode powder obtained by water stripping is first desorbed by anaerobic thermal decomposition to remove PVDF and then crushed, so that the D50 of the crushed positive electrode powder is controlled below 10μm.

[0162] 2. Spreading the powder:

[0163] The crushed cathode powder is injected into the spreading head through the feeding pipe.

[0164] The anode plate is lifted and moved to the left limit position to provide space for material spreading.

[0165] The spreading head moves down to the set height and moves to the left along the guide rail to spread the material evenly on the cathode plate, with the thickness controlled between 0.5 and 2 cm.

[0166] 3. Gas desorption and adsorption:

[0167] Vacuum for 5 minutes to desorb the gas from the surface of the electrode powder.

[0168] The vacuum pipe is shut off, the spreading mechanism and anode plate are moved to the right area, and the anode plate moves down to just cover the cathode plate.

[0169] Turn on the ultrasonic vibrator and introduce oxygen for 2-5 minutes to allow the amorphous carbon to adsorb oxygen.

[0170] 4. Compressing and heating:

[0171] Turn off the ultrasonic vibrator, move the anode plate down and press the lithium iron phosphate electrode powder with a certain pressure.

[0172] Evacuate the vacuum again for 5 minutes to ensure that oxygen exists only in the areas where it has been adsorbed.

[0173] A current (50-500V) is applied to the anode and cathode plates. The carbon in the cathode powder forms a conductive path, generating a large current and producing heat.

[0174] When the probe temperature reaches about 500℃, intermittently apply power to maintain the temperature at 500℃ for 5 to 10 minutes.

[0175] 5. Unloading:

[0176] After the positive electrode powder is heated, the anode plate rises and the discharge baffle falls.

[0177] Turn on ultrasonic vibration and simultaneously rotate the unloading shaft 90° clockwise to unload the material.

[0178] After unloading is completed, turn off the ultrasonic switch and return the cathode plate to its original position.

[0179] 6. Loop processing:

[0180] The next batch of materials is processed, and steps 2 through 5 are repeated.

[0181] Through the above steps, selective oxidation removal of amorphous carbon in waste lithium iron phosphate electrodes is achieved, while retaining the conductive carbon phase and lithium iron phosphate material, thereby reducing the carbon content.

[0182] Note: The parameters such as temperature, pressure, and gas flow rate in the examples are preset values ​​and can be adjusted appropriately according to actual conditions. The use of the unloading mechanism and ultrasonic vibrator helps to improve unloading efficiency and powder collection rate. Throughout the process, the control unit is responsible for coordinating the actions of each component to achieve automated control.

[0183] The various modules in the aforementioned lithium iron phosphate remediation material carbon content reduction device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0184] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 5 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores data related to methods for reducing carbon content using lithium iron phosphate remediation materials. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for reducing carbon content using lithium iron phosphate remediation materials.

[0185] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0186] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0187] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0188] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0189] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for reducing the carbon content of a lithium iron phosphate remediation material, characterized in that, The method includes: The positive electrode powder from the waste lithium iron phosphate electrode sheet is placed in the cavity formed between the electrode plates, oxygen-containing gas is introduced into the positive electrode powder, and the positive electrode powder is compressed. By applying current to the electrode plate in an oxygen-containing environment, the resistance difference of different carbon phases in the positive electrode powder is utilized to control the amorphous carbon to be preferentially heated and selectively oxidized, while retaining the conductive carbon phase. When the temperature of the positive electrode powder is detected to reach a preset temperature threshold, the electrode plate is intermittently energized to control the temperature of the positive electrode powder to not exceed the preset temperature threshold. Continuous intermittent energizing continues until the content of amorphous carbon decreases to the target range.

2. The method according to claim 1, characterized in that, The cavity formed by placing the positive electrode powder from the waste lithium iron phosphate electrode sheet between the electrode plates further includes: The waste lithium iron phosphate electrode sheets are stripped by anaerobic pyrolysis or water stripping, and the resulting lithium iron phosphate positive electrode powder is crushed until the particle size of the crushed positive electrode powder is within a preset particle size range.

3. The method according to claim 2, characterized in that, The step of introducing oxygen-containing gas into the positive electrode powder and compacting the positive electrode powder includes: The positive electrode powder is placed in a vacuum environment to perform gas desorption, wherein the gas desorption time is determined based on the surface area and porosity of the positive electrode powder. Oxygen-containing gas is introduced into the positive electrode powder to allow the powder to adsorb oxygen, wherein the amount of oxygen adsorbed is sufficient to oxidize amorphous carbon but insufficient to oxidize lithium iron phosphate. The electrode plate is placed in an environment with an oxygen content lower than a preset value, and the positive electrode powder is compressed.

4. The method according to claim 1, characterized in that, The intermittent energization of the electrode plate includes: Based on the temperature of the positive electrode powder, the duty cycle and duration of the current are adjusted, and the electrode plate is intermittently energized using a pulse energizing method.

5. A device for reducing the carbon content of lithium iron phosphate remediation materials, characterized in that, The apparatus comprising the method of any one of claims 1-4, wherein the method comprises: The frame, electrode plate, lifting mechanism, limit plate, control unit, power module, guide rail, and feeding mechanism that reciprocates along the guide rail; The electrode plate includes a cathode plate and an anode plate, with the cathode plate fixed to the bottom of the frame; the spreading head of the feeding mechanism is used to evenly spread the positive electrode powder on the cathode plate; When the positive electrode powder is being spread, the anode plate is placed on a limiting plate on one side of the cathode plate via the lifting mechanism; after the positive electrode powder is spread, the anode plate is placed above the cathode plate via the lifting mechanism, and a cavity for accommodating the positive electrode powder is formed between the anode plate and the cathode plate. The anode plate and the cathode plate are respectively electrically connected to the power module, and are used to apply a preset voltage to the positive electrode powder; The cathode plate or the anode plate is equipped with a temperature probe, which is signal-connected to the control unit. The control unit is used to control the power module to be intermittently powered when the temperature of the positive electrode powder reaches a preset temperature threshold.

6. The apparatus according to claim 5, characterized in that, The lifting mechanism includes a servo motor, a ball screw, and a guide rod. The servo motor is fixed to the end of the guide rail. The output shaft of the servo motor is connected to the ball screw via a coupling. The anode plate is threadedly connected to the ball screw and slides in cooperation with the guide rod.

7. The apparatus according to claim 5, characterized in that, The feeding mechanism includes a hopper, a feeding pipe, and a linear module. The outlet of the hopper is connected to the inlet of the feeding pipe via a hose, and the outlet of the feeding pipe is connected to the spreading head. The spreading head is mounted on the linear module via a slider, and the linear module is fixed to the top of the frame parallel to the guide rail.

8. The apparatus according to claim 5, characterized in that, The device also includes a vacuum module, one end of which is connected to a vacuum pump, and the other end is connected to a cavity formed by the anode plate and the cathode plate through a solenoid valve. The solenoid valve is electrically connected to the control unit.

9. The apparatus according to claim 5, characterized in that, The device also includes an ultrasonic vibration module, wherein the ultrasonic transducer of the ultrasonic vibration module is fixed to the upper surface of the anode plate, and the amplitude transformer of the ultrasonic vibration module extends into the cavity to provide ultrasonic vibration during the feeding and unloading stages.

10. The apparatus according to claim 5, characterized in that, The device also includes a discharge mechanism, which includes a tilting motor, a discharge shaft, and a discharge baffle. The discharge shaft is fixedly connected to the cathode plate. The tilting motor drives the discharge shaft to rotate through a coupling, causing the cathode plate to tilt to complete the discharge. The discharge baffle is hinged to the edge of the cathode plate.

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