Abstract: A process and a device for recycling waste lithium battery materials are provided. The process includes: S10. charging, transporting composite pole pieces to a flexible de-powdering device through a uniform feeder; S20. flexibly removing powder, rubbing and beating the composite pole pieces using the flexible de-powdering device, after flexible depowdering, discharging part of composite current collectors from a closed air spiral discharge pipe connecting to the flexible de-powdering device; S30. centrally receiving materials, transporting falling electrode powder and remaining composite current collectors to a cyclone collector through negative pressure pipelines, and centrally collecting dust produced in the process of uniform feeding and closed air spiral discharge; and S40. screening, screening and separating the materials collected by the cyclone collector using a vibrating screen, and separating the composite current collectors and electrode powder.

Abstract: Provided are a single-crystal ternary cathode material and a preparation method therefor and application thereof. The chemical formula of the single-crystal ternary cathode material is LiNixCoyMnzM(1-x-y-z)Oc@LiaNdOb, wherein 0<x?0.65, 0<y?0.15, 0<z?0.35, 0<a?6, 0<b?4, 1<c?2 and 1?d<2; and M and N are at least one of Zr, Ni, Al, Cu, Co, Sr, Mn, Y, Ti, Mg, Mo, B, Sn, Fe, Zn, Si and W. The single-crystal ternary cathode material is a single-crystal material of a core-shell structure.

Abstract: The present application belongs to the technical field of battery materials. Disclosed are a doped iron (III) phosphate, a method for preparing same, and use thereof. The chemical formula of the doped iron (III) phosphate is (MnxFe1?x)@FePO4·2H2O, wherein 0<x<1. According to the present application, ferromanganese phosphate is used as a template agent for preparing the doped iron (III) phosphate. The doped iron (III) phosphate is regular in morphology and good in fluidity, facilitates washing and conveying, and can improve the electrochemical performance of the subsequently prepared LiFePO4/C. When the doping amount of Mn is 11000 ppm, the specific discharge capacity of LiFePO4/C at room temperature at 0.1 C rate can reach 165 mAh/g; the retention rate of the discharge capacity of 1000 cycles at 45° C. at 1 C rate can reach 97.4%; and at a low temperature of ?15° C. the specific discharge capacity at 0.1 C rate is still 134 mAh/g.

Abstract: The present disclosure discloses a method for preparing a ternary cathode precursor material with low sulfur content and high specific surface area, and belongs to the field of lithium ion battery materials. In the present disclosure, by using a continuous filter with a spraying device for concentrating a reaction material, sulfur impurities can be uniformly removed in a reaction stage, and neither are the reaction environment and the production efficiency affected, nor does introduction of new impurities occur. In addition, by removing the mother liquor by means of negative pressure suction filtration, the material can be oxidized uniformly in a controlled manner, and the specific surface area of the ternary cathode precursor material is uniformly increased, so that during sintering, lithium ions more easily enter the interior of particles of the ternary cathode precursor material, thus exerting a higher capacity.

Abstract: The present application discloses a method for preparing ferric phosphate, including the following steps: mixing a surfactant with a first metal liquid containing iron and phosphorus elements, adding with adding seed crystal, aging under heating and stirring, filtering the aged solution to obtain a filter residue, and drying and sintering the filter residue, thereby obtaining the ferric phosphate; the seed crystal is ferric phosphate dihydrate or basic ammonium ferric phosphate. In the present application, the surfactant is used for modification of the seed crystal, secondary crystal nucleus is generated, which induces the formation of the basic framework of the product particles. Through the aging process, the deposition of the crystal nucleus on the surface of the seed crystal makes the framework of the crystal grain more complete, so that the primary particles are arranged more densely and orderly and tend to constitute spherical secondary particles.

Abstract: The present invention discloses a method of preparing a hard carbon anode material and use thereof. Starch is mixed with nano-silica, the obtained mixture is heat treated at 150° C. to 240° C. under an inert atmosphere, the obtained first-sintered product is heat treated at 180° C. to 220° C. under an oxygen-containing atmosphere, the second-sintered product is cyclonically separated to remove nano-silica to obtain pre-oxidized starch-based microspheres, and the pre-oxidized starch-based microspheres are performed carbonization treatment under an inert atmosphere to obtain the hard carbon anode material. In the present invention, the silica particles can be adsorbed on the surface of the starch raw material, and cross-linking occurs between the starch molecular chains during the heat treatment process, and under the barrier of the silicon dioxide, the starch particles will not be cross-linked but fused to form a spherical structure.

Abstract: Disclosed is a preparation method for a high-nickel ternary cathode material, including the steps of mixing a LiOH powder with a high-nickel ternary precursor according to a molar ratio of (0.6 to 0.95):1, performing primary sintering in an oxygen atmosphere, adding a metal oxide into a LiOH solution to obtain a mixed solution, mixing the mixed solution with a primary-sintered material in a protective atmosphere, drying and crushing a mixed material, performing secondary sintering on a powder material, spraying an atomized boric acid alcohol solution onto a secondary-sintered material, and then tempering to obtain the high-nickel ternary cathode material.

Abstract: Disclosed are a manganese-doped cobaltosic tetroxide, and a preparation method and application thereof, belonging to the field of battery materials. The preparation method of the manganese-doped cobaltosic tetroxide of the disclosure dopes a manganese element into cobalt carbonate with a specific process and matched with a composite surfactant, which can obtain manganese-doped cobaltosic tetroxide particle products with uniform particle size, dispersion and fineness through high-temperature sintering, a proportion of low-valence manganese in the doped manganese is high, and a crystal form of the products obtained by sintering is complete. The preparation method is simple in operation and can realize industrial large-scale production. The manganese-doped cobaltosic tetroxide prepared by the preparation method and the application thereof are also disclosed.

Abstract: The present disclosure belongs to the technical field of battery materials, and discloses a silicon/carbon composite anode material, and a preparation method and use thereof. The preparation method includes the following steps: S1. dissolving a graphite anode powder in an acid solution, and conducting solid-liquid separation (SLS) to obtain a precipitate; and washing and drying the precipitate, adding a reducing agent, and subjecting a resulting mixture to heat treatment to obtain a purified graphite material; and S2. mixing a modified silicon powder with the graphite material, adding a resulting mixture to a polyimide (PI)-containing N,N-dimethylformamide (DMF) solution, and stirring; and subjecting a resulting mixture to distillation and then to carbonization to obtain the silicon/carbon composite anode material.

Abstract: A method includes: (1) adding a food-grade manganese sulfate solution and a complexing agent solution into a sodium ferrocyanide solution for a precipitation reaction to generate Prussian white crystal nucleus; (2) replacing the food-grade manganese sulfate solution with an industrial-grade manganese sulfate solution, and keeping other conditions unchanged, so that the Prussian white crystal nucleus grow continuously to obtain a slurry; and (3) successively subjecting the slurry to an aging reaction, solid-liquid separation, washing and drying to obtain a Prussian white product with a specific particle size. The food-grade manganese sulfate solution, and the sodium ferrocyanide solution are subjected to the precipitation reaction, and then the industrial-grade manganese sulfate solution are added to continue a precipitation reaction. The particle size of the Prussian white is regulated by controlling an adding time of the two manganese sulfate solutions.

Abstract: Disclosed is a production line and production method for positive electrode material of a lithium-ion battery. The production line comprises a roller kiln; a gas collecting device communicated with the roller kiln and configured to collect gas inside the roller kiln; and a free lithium-measuring device configured to measure content of free lithium in the gas collected by the gas collecting device.

Abstract: A compositely coated ternary precursor, and a preparation method therefor and use thereof are provided. The material includes a ternary precursor and a coating layer attached to a surface of the ternary precursor, wherein the coating layer is obtained from a precipitation reaction of a first metal ion and a first polyanion. The metal ion and the polyanion can undergo a precipitation reaction to form a precipitate, to form a uniformly distributed coating layer on the surface of the ternary precursor. After the coated precursor is sintered into a cathode material, part of the coating can form a protective layer on the surface of the material; and the other part of the coating can permeate into the material to form bulk phase doping.

Abstract: Production process of a lithium battery cathode material is provided, comprising: (1) temperature difference test: putting, into a saggar, a material to be sintered, placing the saggar into a roller kiln heat preservation area, setting a same sintering temperature t on an upper layer and a lower layer of the roller kiln heat preservation area according to the characteristics of said material, sintering in a specific atmosphere, and measuring a temperature difference ?t between a surface layer and a bottom layer of the material during sintering; and (2) formal sintering: putting said material into the saggar, placing the saggar into the roller kiln heat preservation area, setting the sintering temperature of the upper layer of the roller kiln heat preservation area as t according to the temperature difference ?t measured in step (1), the sintering temperature of the lower layer being (t+?t), and sintering said material in a specific atmosphere.

Abstract: Disclosed is a method for removing fluorine in a positive electrode leachate of lithium batteries, comprising: adding acid and an oxidizing agent to battery powder for leaching, and removing impurities from the obtained leachate to obtain a fluorine-containing solution; adding dawsonite to the fluorine-containing solution, and meanwhile adding sulfuric acid, stirring for reaction at a certain temperature, and performing solid-liquid separation to obtain fluorine-removed solution and filter residues; and washing the filter residues to obtain crude sodium hexafluoroaluminate. According to the present invention, the dawsonite is used for removing fluorine from waste lithium batteries, the dawsonite has good selectivity, does not react with nickel, cobalt, manganese, lithium and the like in the solution, and only reacts with fluorine ions in the solution, so that the purpose of selectively removing fluorine is achieved, and the loss of nickel, cobalt, manganese and lithium metals in the solution is avoided.

Abstract: A method for recycling valuable metal in a lithium battery positive plate is provided, comprising the following steps: S1, mixing a positive plate material with reducing metal, and then roasting, the roasting being carried out in a protective atmosphere; S2, performing magnetic separation on the material obtained in step S1 to obtain a magnetic component and a non-magnetic component; S3, performing acid dissolution on the magnetic component, concentrating the obtained leaching solution, and then performing cooling crystallization to obtain a metal salt A; and S4, performing water soaking on the non-magnetic component to obtain sediment and water soaking liquid, adding carbonate into the water soaking liquid to obtain lithium carbonate, performing acid dissolution on the sediment, purifying, and performing evaporative crystallization to obtain a dissolved solution to obtain a metal salt B.

Abstract: The invention belongs to the technical field of material synthesis, and discloses a nitrogen-doped hollow cobaltosic oxide and a preparation method and application thereof. A chemical formula of the nitrogen-doped hollow cobaltosic oxide is Co3O4—COF-T-D@C—N; and the COF-T-D is a covalent organic framework. Due to an open hollow structure, the nitrogen-doped hollow cobaltosic oxide of the invention has a large specific surface area, thus having a large contact area with an electrolyte, which is convenient for lithium ions to transport therein. The open hollow structure also prevents a volume effect from being generated during charging and discharging, and nitrogen is introduced for doping, so that granules can be gradually activated to increase the specific surface area and active sites, a discharge (cycle) stability of the material is improved, and a rate performance of the material is improved.

Abstract: Disclosed are a preparation method for high-performance lithium iron phosphate and use thereof. The method comprises the following steps: dispersing a lithium salt into a solvent A, and adding an organic acid to adjust the pH to obtain a mixed solution; dispersing porous iron phosphate into a solvent B, and adding an organic carbon source to obtain a mixed slurry A; adding the mixed slurry A into the mixed solution; grinding the obtained slurry; adding a dispersing agent into the grinding material for stirring and dispersing to obtain a mixed slurry B; placing the mixed slurry B under the pressure of 100-1000 Pa for aging and drying; and sintering the obtained dry material in an inert atmosphere to obtain lithium iron phosphate.

Abstract: A method for preparing nano iron phosphate with low sulfur content. The method may include: S1: mixing a phosphorus source and an iron source to obtain a raw material solution, then adding alkali and a surfactant, adjusting a pH, and stirring and reacting to obtain an iron phosphate dihydrate slurry, S2: adding phosphoric acid solution into the iron phosphate dihydrate slurry, adjusting the pH, heating and stirring for aging, and filtering to obtain iron phosphate dihydrate, S3: adding water into the iron phosphate dihydrate for slurrying, and grinding to obtain a ground slurry; and S4: adding the ground slurry into a washing solution to wash, carrying out solid-liquid separation, and calcining a solid phase to obtain the nano iron phosphate with low sulfur content.

Abstract: Disclosed is a preparation method for high-purity iron phosphate and use thereof, including: mixing and stirring an iron phosphide waste, an acid liquor, an oxidant, and an adsorbent, heating for leaching, and subjecting a resulting mixture to solid-liquid separation (SLS) to obtain a first filtrate and a first filter residue; adding an alkali liquor to the first filtrate to adjust a pH, holding a temperature of a resulting mixture, and subjecting the mixture to SLS to obtain a second filter residue and a second filtrate; and subjecting the second filter residue to a heat treatment to obtain iron oxide; subjecting the iron oxide to high-energy ball-milling, and adding a surfactant for activation to obtain a slurry; and mixing the slurry with phosphoric acid, heating to allow a reaction, subjecting a resulting mixture to SLS to obtain a solid, and washing and sintering the solid to obtain the iron phosphate.

Abstract: The present disclosure discloses a preparation method for a silicon/carbon composite anode material and use of thereof. The preparation method includes the following steps: heating a hypercrosslinked polymer in an inert atmosphere for carbonization to obtain a porous carbide; mixing the porous carbide with a silicon-containing solution to obtain a silicon-containing porous carbide suspension; and adding a complexing agent, a metal salt, and a reducing agent to the silicon-containing porous carbide suspension to allow a reaction, and after the reaction is completed, conducting solid-liquid separation to obtain a solid, and heating the solid in an inert atmosphere to obtain the silicon/carbon composite anode material. In the present disclosure, the metal salt is reduced with the reducing agent under an action of the complexing agent through a metal-embedded-into-silicon treatment, such that a metal layer is formed on a silicon layer adsorbed on the porous carbide.