3418results about "Battery recycling" patented technology

The invention discloses a refined disassembly system and method for a battery monomer, and belongs to the technical field of battery disassembly. The production line comprises a perforating device, a cutting device, a cutting device, a scattering device, a sorting device, a color sorting device, a defluorination device and a powder removal device. The method comprises the following steps: perforating a battery to discharge electrolyte, separating a shell from an inner core by a cutting device, cutting the inner core by a cutting device, scattering by a scattering device, sorting a diaphragm by a sorting device, sorting positive and negative electrode materials by a color sorting device, and respectively removing fluorine by a defluorination device. And finally, the metal foil and the powder are separated through the powder removing device, the damage degree of the crystal structure of the black powder can be reduced, the black powder and the metal fragments are efficiently separated according to the density difference, the metal foil and the black powder are not likely to be excessively mixed, the separation purity is high, the secondary treatment situation is reduced, efficient separation and recycling of the electrode material are achieved, and the production cost is reduced. And the comprehensive function and the resource utilization rate of the system are obviously improved.

The invention discloses a refined disassembly and recovery production line for retired lithium batteries. Comprising an automatic battery feeding station, a battery pretreatment station, a battery discharging station, an electrolyte collecting station, a battery shell disassembling station, a roll core film removing station, a pole piece separating station, a pole piece conveying station, a crushing feeding station, a crushing station, a crushing conveying station, a first-stage separating station, a high-temperature drying station, a drying discharging station and a second-stage separating station. The automatic battery feeding station is connected with the battery pretreatment station, and the battery pretreatment station is connected with the battery discharging station. The refined disassembly and recovery production line for the retired lithium battery is provided with deep discharge equipment, the safety problem of electrified crushing or manual disassembly is avoided, full-process automation is achieved, the recovery efficiency is high, refined disassembly and recovery are achieved, an aluminum shell, a positive plate, a negative plate and a diaphragm are separated, the recovery rate and purity of valuable metal are improved, the production line process is short, and the production line cost is low. And no secondary pollution is generated.

The invention relates to the technical field of retired ternary power battery recovery, and particularly discloses a method for preferentially extracting lithium and recovering valuable metals from a retired ternary lithium battery and application of the method. According to the method, the traditional process is broken through the preferential lithium extraction, and efficient recovery of lithium, Ni, Co and Mn is realized by utilizing'fast-medium-slow 'multi-stage cooperation of a composite reducing agent and accurate adaptation of roasting and leaching parameters, so that the method has the advantages of low cost, high efficiency, low energy consumption and the like, and is suitable for large-scale industrial production. The method is low in energy consumption and environment-friendly, and is applied to resource recycling of the retired ternary lithium battery, and the precursor can be used for reproducing a positive electrode material or used for a catalytic material.

The invention discloses an intelligent sorting method and device for a positive electrode material of a retired lithium ion battery based on a spectrum method, and the device is connected in series with a pretreatment module, a cleaning module, an identification module and a sorting module through a conveying belt in a supporting module to form an automatic sorting assembly line. Pre-treating the retired battery to obtain a clean positive plate; an X-ray fluorescence spectrophotometer in the recognition module collects the spectrum of the positive plate and transmits the spectrum to an industrial personal computer, and the spectrum is preprocessed and then input into a classifier library; the classifier library comprises a main classifier and an increment classifier based on element and spectral shape dual channels, if the output confidence reaches a preset threshold value, the material category is judged, otherwise, the spectrum is temporarily stored as an unknown spectrum; after unknown spectrums are accumulated to a set number, new categories are identified through a clustering algorithm, and a lightweight dichotomy increment classifier is trained and added into a classifier library; and the sorting module drives the hydraulic pushing hand to sort the positive plates according to the identification result. Through cooperative evolution of the main classifier and the increment classifier, the sorting precision is effectively improved.

The invention provides equipment and a process for leaching battery-grade lithium phosphate by using waste lithium iron phosphate, and relates to the technical field of resource recovery and battery material preparation, the equipment comprises a support frame, a heating seat, a leaching tank, a driving mechanism and a discharging mechanism; the heating base is installed in the middle of the interior of the supporting frame, the leaching tank is installed on the inner wall of the heating base, an installation cover is installed on the top of the leaching tank in a sealed mode, a main material pipe and an auxiliary material pipe are installed on the two sides of the leaching tank respectively, and a discharging pipe is installed at the bottom end of the leaching tank; the driving mechanism comprises a mounting seat and a motor, the mounting seat is fixedly arranged at the inner bottom of the mounting cover, and the motor is mounted at the top of the mounting seat. According to the scheme, caked industrial-grade sodium phosphate or sodium hydroxide can be crushed into fine particles by adopting rotary grinding, and a reagent can be uniformly dispersed into a purification solution by matching with rotary dispersion blanking, so that the pH of a system and the concentration of sodium phosphate are integrally stable, local reaction abnormity is avoided, and more stable preparation of battery-grade lithium phosphate is ensured.

The invention discloses a method for separating, purifying and regenerating waste battery negative electrode powder, which belongs to the field of battery recycling and regenerating, and mainly comprises the following process steps of: ball-milling and screening waste battery negative electrode pieces into certain granularity, soaking the waste battery negative electrode pieces in alkali liquor and an impurity removal agent, and stirring for reaction and separation to obtain a negative electrode powder wet material and a copper ion solution; carrying out drying demagnetization and infrared irradiation treatment on the wet negative electrode powder to obtain regenerated negative electrode powder; and the copper ion solution is subjected to extraction, back extraction and reduction to obtain crude copper, and the crude copper is subjected to vacuum distillation to obtain an electronic-grade copper product. Wherein the impurity removal agent comprises an oxidizing agent, the oxidizing agent oxidizes elemental copper and forms soluble substances under the action of alkali liquor, and the excellent separation effect is achieved. The negative electrode powder treatment comprises infrared irradiation treatment, decomposition of an adhesive can be achieved through the dual effects of heat irradiation and heat conduction, the volume heating effect is formed through scattering, surface crusting is effectively avoided, the adhesive can be efficiently removed, and the quality and the recycling efficiency of the regenerated negative electrode powder are guaranteed.

The invention discloses a dispergator of a polyurethane structural adhesive as well as a preparation method and application of the dispergator. The dispergator comprises a polar organic solvent, an alcohol additive, a basic catalyst, an ionic liquid and a surfactant. The dispergator is suitable for removing a bonding interface of a thermosetting polyurethane structural adhesive in a power battery module, the dispergation process is mild and safe, and swelling, fracture and interface release of the structural adhesive can be realized in a range from normal temperature to 55 DEG C. Compared with a traditional high-corrosion and high-energy-consumption dispergation means, the dispergation agent has the advantages of being high in degumming efficiency, little in residual gum, free of base material corrosion and the like, is suitable for the environment-friendly recycling and reusing scene of the retired lithium battery, and has good engineering practicability and popularization value.

The invention relates to the technical field of new energy battery recycling, and discloses a new energy battery recycling device which comprises a disassembling table, supporting tables are fixed to the two sides of the disassembling table, multi-axis mechanical arms are fixed to the tops of the supporting tables, and a laser cutting head and a vacuum adsorber are fixed to the tail ends of the two multi-axis mechanical arms correspondingly. The new energy battery recycling device comprises a disassembling table, adjusting grooves are formed in the inner walls of the two sides of the disassembling table, first air cylinders are slidably connected to the interiors of the adjusting grooves, and second air cylinders are fixed to the bottoms of the first air cylinders. The first air cylinder drives the linkage frame and the ejector rod to move in the vertical direction of the new energy battery, in the moving process, the ejector rod is clamped into a cutting gap of the new energy battery, and then through continuous movement of the ejector rod, the effect of uncovering shells on the two sides of the soft package lithium battery is achieved; and the convenience of disassembling the shell of the soft package lithium battery by the vacuum adsorber is further improved.

The invention discloses a co-processing method for multi-source lithium battery solid waste. The method comprises the following steps: S1, putting the waste lithium battery recovery wastewater, black powder and a certain amount of acid into a hydrothermal reaction kettle, sealing, and introducing oxygen or air into the hydrothermal reaction kettle; s2, raising the temperature of the hydrothermal reaction kettle to 180-250 DEG C, and carrying out constant-temperature reaction for 0.5-3 hours; s3, after the reaction is finished, cooling to room temperature, and separating a reaction product to obtain filtrate and filter residues. According to the cooperative treatment method, high-efficiency treatment of difficult-to-treat salt-containing organic wastewater and selective extraction of lithium in the battery black powder are synchronously realized.

The invention belongs to the field of genetic engineering and resource recycling, and relates to a ferrous oxide recombinant bacterium, a recombination method and application of the ferrous oxide recombinant bacterium in lithium battery metal recovery. The ferrous oxide recombinant bacterium is obtained by taking thiobacillus ferrooxidans as an original strain through genetic engineering modification; comprising thiobacillus ferrooxidans, an exogenously introduced nickel / cobalt efflux protein RcnA gene, a vector pJRD215 and donor bacteria, and the nickel / cobalt efflux protein RcnA gene is introduced into the vector pJRD215, driven to express and then introduced into the donor bacteria to express. The application of the constructed and prepared ferrous oxide recombinant bacteria in lithium battery metal recovery is used for improving the leaching efficiency of metal ions Co < + > or / and Li < + > or / and Ni < + > in lithium battery powder; and the method shows good adaptability and stability under different substrate concentrations, and provides a key experimental support and an important experimental basis for application of a microbial enhanced leaching technology in the field of waste lithium battery resource utilization.

The invention discloses a method and a system for efficiently removing a diaphragm of a non-liquid-injected roll core and accurately separating a positive pole piece and a negative pole piece. The method comprises the following steps: S1, carrying out primary slice dissociation; s2, primary winnowing and coarse removal; s3, secondary slicing and refined hydrolysis; s4, secondary winnowing and fine removal; s5, size grading; and S6, adaptive color selection. According to the method, traditional shredding is replaced by grading slicing, structural lamination of the materials in the treatment process is fundamentally avoided, the high removal rate of the diaphragms and high-precision sorting of pole piece materials in different forms are sequentially achieved, and the purity and process efficiency of overall recycled products are remarkably improved.

The utility model discloses a device for sorting copper and aluminum particles after crushing of waste lithium batteries, which is provided with a vibrating screen (1), and a material inlet at the upper part of the vibrating screen (1) receives materials generated by a crusher; the sorting device is also provided with a large particle sorting machine (4) and a small particle sorting machine (6); and a large particle outlet and a small particle outlet of the vibrating screen (1) are respectively connected with the large particle sorting machine (4) and the small particle sorting machine (6) through the conveying pipeline (3). By the adoption of the technical scheme, the copper-aluminum mixture generated in the waste lithium battery crushing and sorting process can be efficiently sorted, high-purity copper particles and aluminum particles are obtained, and recycling of waste materials is achieved; the process is reasonable and feasible, equipment is simple, and recovery cost is low.

The invention belongs to the technical field of material recovery, and particularly discloses a regeneration method of a waste lithium iron phosphate battery positive electrode material, a lithium ion battery positive plate prepared from regenerated lithium iron phosphate powder and a lithium ion battery. Waste lithium iron phosphate powder is uniformly mixed with uric acid and a lithium source, and the mixture is subjected to annealing and annealing treatment in an inert atmosphere, so that structure repair and performance upgrading of a failure material are realized. Uric acid serves as a reducing agent and a carbon-nitrogen source at the same time in the process, Fe < 3 + > is effectively reduced through thermal decomposition of the uric acid, anti-position defects are reduced, a uniform nitrogen-doped carbon coating layer is synchronously formed on the surfaces of particles, and the conductivity and the ion diffusion rate of the material are remarkably improved. The method is short in process flow and environment-friendly, and does not need to use strong acid and strong alkali. The regenerated lithium iron phosphate material has excellent electrochemical performance, the capacity retention rate reaches 91.22% after 500 times of circulation under the multiplying power of 0.5 C, the capacity retention rate is far superior to that of a commercial material, and an effective way is provided for high-valued recovery of waste lithium iron phosphate.

The invention belongs to the technical field of lithium ion battery material recovery, and discloses a regeneration, repair and doping method of a waste lithium iron phosphate material and a regenerated positive electrode material. The method comprises the following steps: firstly, immersing waste LiFePO4 powder into a mixed solution of citric acid and ascorbic acid, oscillating to selectively dissolve out Fe < 3 + > impurities, and synchronously reducing Fe < 3 + > on the surface to Fe < 2 + >; then Li2CO3 is added into the leached powder for lithium bit compensation, and ball milling and uniform mixing are carried out; then Al2O3 and TiCl3 are added for aluminum-titanium co-doping, and ultrasonic dispersion is carried out uniformly; and finally, carrying out segmented sintering. In the first stage, sintering is carried out in an air atmosphere at 300-350 DEG C; in the second stage, sintering is performed at 600-700 DEG C in an inert gas atmosphere; and finally obtaining the regenerated positive electrode material. According to the method, waste lithium iron phosphate batteries can be turned into wealth, the lithium iron phosphate positive electrode material with good electrochemical performance is obtained, the complex and expensive impurity removal process is omitted, the cost is low, and possibility is provided for large-scale industrial regeneration and repair of waste lithium iron phosphate active substances.

The invention provides a method for preparing a high-voltage medium-nickel ternary positive electrode material by synergistic regeneration of a waste ternary lithium battery, which comprises the following steps: S1, taking a pretreated waste high-nickel and low-nickel ternary positive electrode material, calculating and supplementing a metal source and a lithium source according to the metal proportion of the actual content, and mixing the elements according to the total molar ratio of Li: (Ni + Co + Mn) = 1.0-1.1; s2, a composite fluxing agent containing lithium ion metal salt is added into the calibration mixture obtained in the S1, and two-stage sintering is carried out; and S3, coating the surface of the final product with a metal oxide aqueous solution corresponding to the lithium ion metal salt in the S2 as a coating agent to obtain the ternary positive electrode material. The nickel-rich characteristic of the high-nickel material and the manganese / cobalt-rich characteristic of the low-nickel material are utilized to form element complementation, so that the utilization rate of nickel, manganese and cobalt elements in the waste material is maximized, and the composition proportion limitation during regeneration of a single waste material is broken through.

The invention relates to the technical field of environmental protection, and discloses a method for degrading formamide organic wastewater and recycling key metals of a retired lithium ion battery. The method comprises the following steps: S1, obtaining the positive electrode material of the retired lithium ion battery, mixing the positive electrode material with formamide organic wastewater, and carrying out hydrothermal reaction to obtain a leachate; s2, adjusting the pH value of the leachate to 6-14, and carrying out a transition metal precipitation reaction to obtain a transition metal hydroxide precursor and a lithium-rich filtrate; and S3, adding a sodium carbonate solution into the lithium-rich filtrate, carrying out a precipitation reaction, and collecting lithium carbonate. The formamide organic wastewater serves as an endogenous reducing agent, deep degradation of the formamide organic wastewater is achieved under the hydrothermal condition, efficient leaching of key metal in the retired lithium ion battery is achieved, and waste is treated with waste; the formamide degradation efficiency can reach 90% or above, and the defects that an existing formamide wastewater treatment method is high in energy consumption, large in reagent consumption, high in cost, low in degradation efficiency and large in environmental treatment pressure are overcome.

The invention belongs to the technical field of resource recycling of waste lithium batteries, and particularly relates to a method for extracting lithium by stripping and coupling organic matter degradation of waste lithium batteries, which comprises the following steps: S1, obtaining a waste lithium iron phosphate positive plate and an organic pollutant aqueous solution; s2, soaking the waste lithium iron phosphate positive plate in an organic acid solution, and stripping to obtain an aluminum foil and a lithium iron phosphate material; s3, adding the lithium iron phosphate material, a complexing agent and an oxidation auxiliary agent into the organic pollutant aqueous solution to obtain a first reaction system, and carrying out a first reaction; after the reaction of the second reaction system is balanced, carrying out solid-liquid separation to obtain filtrate and filter residues, adding a lithium salt precipitator into the filtrate, and filtering to obtain lithium salt and recovering the lithium salt; according to the method, the battery recovery process and the wastewater treatment process are ingeniously coupled, the components of the waste battery material are used as the catalyst, organic pollutants in the environment are degraded, and cooperative treatment of waste and upgrading and recovery of resources are achieved.

The utility model provides a waste battery recovery device. The waste battery recovery device comprises a pretreatment device, a melting device, a first impurity removal device, a non-lithium active metal element extraction device, a second impurity removal device and a second metal element extraction device. According to the waste battery recycling device, the recycling process can be simplified, the recycling yield is increased, the recycling cost is reduced, and the requirement for the device is low.

The invention provides a waste battery recovery method and device, the method uses a low-melting-point molten salt with reducibility as a reactant to strip Li, Co, Ni, Mn and other elements in a waste battery from an oxygen element, chlorine salt which is easier to carry out subsequent replacement reaction is generated, the Li, Co, Ni, Mn and other elements in the waste battery can be extracted step by step through the replacement reaction, and the recovery rate of the waste battery is improved. And the recovery process is simplified. The waste battery recycling method has the advantages of being low in cost, high in recycling yield, low in requirement for recycling equipment and the like.

The invention relates to a method for selectively leaching and regenerating a positive electrode material from a waste lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: discharging, disassembling, crushing, calcining and screening the waste lithium ion battery, adding an obtained positive active material into an oxalic acid solution, and stirring and reacting at 60-80 DEG C under the irradiation of an ultraviolet lamp to obtain a leaching solution rich in metal elements and leaching residue iron phosphate; adding sodium carbonate into the leachate for reaction to obtain lithium carbonate; and ball-milling and mixing iron phosphate, lithium carbonate and a carbon source, drying and calcining to obtain the regenerated lithium iron phosphate positive electrode material. The oxalic acid system is catalyzed by ultraviolet light to generate hydroxyl free radicals with strong oxidizing property, so that the leaching efficiency of lithium is remarkably improved, and the dissolution of iron is inhibited, thereby realizing the efficient separation of lithium and iron. The leaching residue is high-purity iron phosphate, lithium in the leaching solution is recycled in the form of lithium carbonate, and the leaching residue and the lithium carbonate can be directly used for regenerating the lithium iron phosphate positive electrode material as precursors, so that the technological process is greatly simplified, and the production cost is reduced.

The application relates to the technical field of lithium battery recycling, and particularly discloses a retired lithium ion power battery pack disassembling integrated equipment which comprises a gantry, a workbench, a feeding assembly, a milling assembly, a first gantry mechanical hand, a curling assembly, a separating assembly and a module extruding assembly; through the cooperative work of the assemblies, the retired lithium ion power battery pack disassembling integrated equipment realizes the automatic disassembling of the retired lithium ion power battery pack, especially realizes the removal of a cooling bottom plate and the automatic removal and collection of a battery module; wherein the use of the quick-change assembly enables the first gantry mechanical hand to quickly switch different tools, improves the working efficiency and the automation degree of the equipment; the separating assembly and the module extruding assembly are arranged, the automatic collection of the cooling bottom plate and the battery module is realized, and the automation level is further improved.

The invention discloses a CTP battery pack disassembling and recycling method. The method comprises the following steps: S1, pretreating a CTP battery pack to remove mechanical connection between battery cells; s2, judging the type of a structural adhesive in the pretreated CTP battery pack, and performing freezing treatment or heating treatment on the CTP battery pack according to the type of the structural adhesive; s3, turning over the CTP battery pack after the freezing treatment or the heating treatment; s4, the turned CTP battery pack is subjected to vibration treatment, so that the battery cells are separated from the CTP battery pack; s5, the battery cells are recycled; according to the device, different treatment modes are adopted for different structural adhesives, separation through a manual crowbar is avoided, and the disassembly efficiency is improved.

The invention discloses a lithium ion battery positive electrode material and a photo-thermal recovery method and application thereof. The photo-thermal recovery method comprises the following steps: uniformly mixing the waste lithium ion battery positive electrode material, a lithium source and a solvent, and performing photo-thermal lithium supplementation to obtain the regenerated lithium ion battery positive electrode material. According to the photo-thermal recovery method provided by the invention, lithium supplement and phase repair can be realized in the photo-thermal process, direct regeneration of the waste lithium ion battery positive electrode material is realized, and the components, the structure and the electrochemical performance of the recovered and repaired positive electrode material are equivalent to those of a commercial material; and moreover, the lithium supplementing time is remarkably shortened, the reaction temperature and pressure are reduced, the energy loss and regeneration cost are reduced, and the method is very environment-friendly and can be widely applied to the field of preparation of lithium ion battery positive electrodes or lithium ion batteries.

The invention discloses a method for regenerating and preparing high-voltage lithium cobalt oxide by using an invalid lithium cobalt oxide material, and belongs to the technical field of battery recovery. The method comprises the following steps: S1, carrying out ball milling and mixing on failed lithium cobalt oxide powder and a sodium source, and then carrying out solid-phase sintering to obtain a P2 type sodium cobalt oxide and lithium cobalt oxide material; s2, the P2 type sodium cobaltate and lithium cobaltate material is placed in a lithium-containing solution for a hydrothermal reaction, a regenerated O2-O3 cotype lithium cobaltate material is obtained, the regenerated O2-O3 cotype lithium cobaltate material has the advantages of being good in cycling stability, high in rate capability, high in low-temperature performance and the like under the high voltage of 4.6 V, and the performance of the regenerated O2-O3 cotype lithium cobaltate material is superior to that of a commercial lithium cobaltate material.

The invention provides a method for strengthening recovery of a waste lithium iron phosphate material by using waste lithium cobalt oxide as an oxidizing agent. The method comprises the following steps: discharging and disassembling waste lithium iron phosphate and lithium cobalt oxide batteries to obtain positive plates; dissolving aluminum foil in the positive plate in a sodium hydroxide alkaline leaching solution to obtain lithium iron phosphate and lithium cobalt oxide positive electrode powder; the method comprises the following steps: leaching lithium iron phosphate positive electrode powder by adopting a deep-eutectic solvent, and meanwhile, realizing an enhanced leaching process by taking lithium cobalt oxide positive electrode powder as an oxidizing agent; and carrying out coordination separation and photo-reduction separation on the completely leached solution to realize selective recovery of cobalt, iron, phosphorus and lithium. According to the method, the oxidation-reduction capacity of the material is fully utilized to strengthen the leaching process, efficient recovery of valuable elements in the waste positive electrode material is achieved, and additional addition of an oxidizing agent and a reducing agent is avoided. The method can achieve the purposes of synergistic enhanced leaching and selective separation of the waste lithium cobalt oxide material and the waste lithium iron phosphate material, and is low in cost, high in recovery rate and wide in industrial application prospect.

The invention provides an intelligent response nano-film and application thereof in waste lead-acid storage battery electrolyte recycling, and relates to the technical field of waste lead-acid storage battery electrolyte recycling, the intelligent response nano-film breaks through performance limitation of an existing film system through a specific intelligent material structure, and when heavy metal ions such as Pb < 2 + >, Fe < 3 + > and Cu < 2 + > enter the film, the intelligent response nano-film can be recycled, and the service life of the intelligent response nano-film is prolonged. The metal ligands are combined with metal ions to cause local shrinkage or closing of pore channels, so that the active defense and intelligent blocking effects of blocking heavy metals are achieved; and when SO4 < 2-> and H < + > pass through the channel, membrane pore channels are kept in an open state, so that rapid acid flux (namely the amount of substance passing through the membrane layer in unit time) of sulfuric acid is realized. The intelligent response nano film has a programmable aperture of a polymer liquid crystal network and an intelligent response valve mechanism of metal, and selective separation of heavy metal and sulfuric acid is realized by stimulating reversible adjustment of an induced film structure.

The invention belongs to the technical field of lithium battery material recovery, and particularly relates to a method for recovering a waste lithium iron phosphate positive electrode material. The method comprises the following steps: (1) grinding and sieving the positive electrode material of the waste lithium iron phosphate battery, mixing with an alkaline solution, stirring and leaching, and carrying out solid-liquid separation to obtain a lithium-rich solution and leaching residues; (2) introducing a saturated sodium carbonate solution into the obtained lithium-rich solution, carrying out heating reaction, filtering, taking a solid phase, and drying to obtain lithium carbonate; and the obtained leaching residues are dried, and ferroferric oxide is obtained. According to the method, the waste lithium iron phosphate battery positive electrode material is leached through the alkaline liquid phase, it can be guaranteed that lithium and iron in waste lithium iron phosphate are separated through a one-step leaching method, and therefore selective lithium extraction is achieved. The whole technological process is convenient to operate, mild in reaction condition and low in energy consumption, does not need to use any acid or oxidant, avoids generation of a large amount of waste liquid and harmful gas, and is high in selective lithium extraction efficiency.

The invention discloses a preparation method of a high-rate wide-temperature-range regenerated graphite negative electrode material, and belongs to the technical field of lithium ion battery recovery. The invention provides a preparation method of a high-magnification wide-temperature-range regenerated graphite negative electrode material, which combines a multi-section high-temperature synergistic treatment means and a lithium-rich catalytic surface modification technology, realizes impurity removal of a waste graphite negative electrode under the condition of lower energy consumption, and realizes effective repair of a graphite crystal structure. According to the method, through the synergistic effect of ultrahigh-temperature gasification and the reactive atmosphere, trace metal impurities which are most difficult to remove and fluorine-containing compounds with thermal stability are almost thoroughly removed, and the purity of the regenerated graphite is improved to be close to the level of a primary material (the purity gt is 99.9%); and a lithium-rich catalytic surface modification technology is adopted, so that the graphite surface can be stabilized, and the rate capability and low-temperature performance of the material are improved. The graphitization degree (gt; 95%) of the material is remarkably improved through the in-situ defect repairing effect driven by ultrahigh temperature, and the highly-ordered layered crystal structure and the excellent conductive network of the material are recovered.

The invention relates to a lithium ion battery positive electrode material regeneration method based on the synergistic effect of Nb < 5 + > / Ta < 5 + > / Mo < 6 + > doping and molten salt reconstruction, and belongs to the technical field of lithium battery material recovery and regeneration, a high-temperature molten salt system represented by LiOH-NaCl / Na2SO4 is adopted, NbCl5 / TaCl5 / MoCl6 is introduced as a dopant, and synchronous implementation of structure repair and Nb < 5 + > / Ta < 5 + > / Mo < 6 + > doping is realized in the lithium supplement reconstruction process, so that the lithium supplement reconstruction process is simplified, and the lithium ion battery positive electrode material regeneration method is suitable for large-scale popularization and application. Meanwhile, various structural defects such as lithium vacancies, cation mixing, lattice oxygen loss and particle cracks in the retired high-nickel positive electrode material are repaired, doped elements enter lattices at high temperature to form high-bond-energy O-TM bonds, surface lattice oxygen can be effectively anchored, oxygen vacancy generation and oxygen separation are inhibited, and the service life of the positive electrode material is prolonged. Therefore, the structural stability of the regenerative positive electrode under high voltage is remarkably improved. Meanwhile, a lithium ion diffusion channel is widened by doping Nb < 5 + > / Ta < 5 + > / Mo < 6 + >, the material has more excellent rate capability and long cycle stability in combination with a grain boundary elimination effect brought by crystal reconstruction, and the material has wide adaptability and good industrial popularization prospects.

The invention discloses a regeneration method of a positive electrode active material, a regenerated positive electrode active material and a battery, and belongs to the technical field of regeneration of positive electrode active materials. The method comprises the following steps: mixing a positive electrode active material and a lithium salt, heating and preserving heat to obtain eutectic molten salt in a molten state, and inducing the eutectic molten salt to generate a cavitation effect. The molten lithium salt in the eutectic molten salt can supplement lithium ions lost by the positive electrode active material and repair and regenerate the positive electrode active material, the eutectic molten salt in the molten state is a carrier of the cavitation effect, the cavitation effect can further promote repair and regeneration of the positive electrode active material in the eutectic molten salt, and the two are combined to generate a synergistic effect; the regeneration of the retired lithium ion positive electrode active material is improved in situ in one step, so that the regenerated positive electrode active material with relatively high capacity retention ratio can be obtained, and the remanufacturing requirement of a vehicle-specification-grade power battery is met.