103results about "Cobalt carbonates" patented technology

The invention discloses a method for extracting and recovering metal elements in lithium batteries using a chlorination method, which belongs to the technical field of lithium battery recovery. The method comprises the following steps: step 1, calcining the positive electrode sheet of the lithium battery to remove organic matter, and peeling off the aluminum foil to obtain electrode material powder; step 2, placing the electrode material powder on a carrier of a Joule heat device, and performing a thermal shock treatment under a chlorine atmosphere, and the treatment process is staged by stage heating and chlorination; step 3, desublimating the gas generated after chlorination in each stage; step 4, adding the solid after desublimation in each stage to deionized water, adding a sodium carbonate aqueous solution after mixing, collecting the precipitate, washing and drying to obtain a metal salt product. The present invention is based on the characteristics of Joule heat that can heat quickly and accurately control the temperature, combined with the difference in the temperature of the chlorination reaction of different metal oxides and the gasification temperature of the chlorination product, to achieve staged gasification and desublimation treatment, obtain different metal chlorides, and purify accurately and efficiently.

The invention relates to high-aluminum-content basic cobalt carbonate and a preparation method thereof. The method comprises the following steps: 1) preparing a mixed solution from cobalt salt and aluminum salt; (2) adding a small amount of ammonium bicarbonate solution into a reaction kettle, starting heating, adding the mixed solution into the reaction kettle while stirring, controlling the pH value, and reacting to obtain a seed crystal dispersion liquid; and (3) adding the mixed solution and an ammonium bicarbonate solution into the seed crystal dispersion liquid, controlling the pH value, continuously reacting under heating and stirring until the particle size of the basic cobalt carbonate reaches a set value, stopping the reaction, and carrying out filter pressing, washing and drying to obtain the basic cobalt carbonate with high aluminum doping amount. The aluminum doping in the basic cobalt carbonate provided by the invention is as high as 7767-8357ppm, and the aluminum element is uniformly distributed and does not segregate.

The invention relates to composite-form aluminum-doped cobalt carbonate as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a first carbonate solution, a second carbonate solution and an aluminum-doped cobalt salt solution; under the stirring condition, the aluminum-doped cobalt salt solution and the first carbonate solution are added into the second carbonate solution for a pre-reaction, and a reaction solution containing cobalt carbonate seed crystals is obtained; an aluminum-doped cobalt salt solution and a first carbonate solution are continuously added into the reaction solution, a first reaction and a second reaction are sequentially carried out, composite-form aluminum-doped cobalt carbonate particles are obtained, the second reaction comprises a first stage and a second stage, the mass ratio of the aluminum-doped cobalt salt solution to the first carbonate solution in the first stage is 1: 1-2: 1, and the mass ratio of the aluminum-doped cobalt salt solution to the second carbonate solution in the second stage is 1: 1-2: 1; and in the second stage, the mass ratio of the aluminum-doped cobalt salt solution to the first carbonate solution is (0.10: 1)-(0.25: 1). According to the preparation method disclosed by the invention, uniform dispersion of an outer-layer aluminum sheet is realized, and the uniformity of aluminum doping in cobalt carbonate is improved.

The invention provides phase-inversion-free aluminum-doped cobalt carbonate and a preparation method thereof, a positive electrode material and a battery, the preparation method comprises the following steps: feeding an aluminum-containing first cobalt salt solution and a first precipitant solution into a reaction device, and carrying out a first precipitation reaction to obtain a first reacted material containing first solid-phase particles; introducing a second cobalt salt solution and a second precipitant solution into the first reaction post-material, and carrying out a second precipitation reaction to prepare aluminum-containing cobalt carbonate, so as to obtain a second reaction post-material containing second solid-phase particles; wherein the average particle size of the second solid-phase particles is 2-3 [mu] m larger than that of the first solid-phase particles. According to the method, the aluminum-containing first cobalt salt solution is firstly adopted for the first precipitation reaction, then the aluminum-free second cobalt salt solution is adopted for the second precipitation reaction, and the mass concentrations of cobalt in the two stages of reactions are controlled to be the same, so that the aluminum segregation phenomenon in the highly aluminum-doped precursor can be greatly reduced, and the material percent of pass is improved.

The present invention discloses a cobalt oxide and a preparation method thereof, lithium cobalt oxide, a positive electrode sheet and a battery, and relates to the technical field of positive electrode materials for lithium batteries. The Dv50, the grain size D(111) of the (111) crystal plane and the specific surface area BET of the cobalt oxide satisfy the following relationship: 3.33 g ‑1 ≤#imgabs0#≤6.90g ‑1 , wherein the Dv50 of the cobalt oxide is 3-20 μm. The cobalt oxide is obtained by pre-sintering and calcining cobalt carbonate with a crystallinity of 30%-80% and a median particle size Dv50 of 3-22 μm; the cobalt oxide has high reactivity with the lithium source and good mechanical properties, and the obtained lithium cobalt oxide has a high lithium ion diffusion rate, thereby having a high specific capacity and initial charge and discharge efficiency.

The invention provides high-aluminum doped cobalt carbonate and a preparation method and application thereof, and the preparation method comprises the following steps: (1) injecting a cobalt-aluminum mixed salt solution, a carbonate solution and an organic weak acid solution into a base solution in a parallel flow manner, and carrying out a co-precipitation reaction to obtain a precursor; and (2) stopping injection of the organic weak acid solution, continuing to inject the cobalt-aluminum mixed salt solution and the carbonate solution, and carrying out a co-precipitation reaction to obtain the high-aluminum doped cobalt carbonate. According to the method, through segmented coprecipitation and control of the types of precipitants used for coprecipitation of all the segments, the doping amount and uniformity of aluminum in cobalt carbonate can be improved, aluminum segregation is avoided, and meanwhile high-aluminum-doped cobalt carbonate higher in sphericity degree and better in compactness can be obtained.

The invention discloses an aluminum-magnesium co-doped cobalt carbonate precursor as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively preparing a cobalt-aluminum mixed solution and a magnesium-containing precipitant solution; and adding the cobalt-aluminum mixed salt solution and the magnesium-containing precipitant solution into a base solution, and carrying out a co-precipitation reaction to obtain the aluminum-magnesium co-doped cobalt carbonate precursor. According to the method disclosed by the invention, the magnesium element is introduced into the precipitant solution in advance, so that magnesium ions can be complexed with the precipitant in advance, and the problems of nonuniform doping and segregation caused by difficult control of the precipitation rate of magnesium in the doping process are solved. According to the aluminum-magnesium co-doped cobalt carbonate precursor prepared by the method, magnesium and aluminum are uniformly doped, and the cycling stability of a lithium cobalt oxide battery can be effectively improved.

The present invention relates to the technical field related to crude cobalt acid raw materials, and specifically provides a crude cobalt acid raw material pretreatment device, comprising: a frame, a base is fixedly installed inside the frame, a mixing tank is fixedly installed inside the base, a processing box is connected and installed on the upper inner side of the mixing tank, a pushing barrel is connected and installed at one end of the processing box, a fixed barrel is connected to the inside of the processing box away from the pushing barrel, a second rotating shaft is installed inside the pushing barrel, the processing box and the fixed barrel for common rotation, a driving mechanism is provided at one end of the second rotating shaft, an impurity removal mechanism is provided inside the processing box, an impurity removal pipe is connected and installed inside the fixed barrel, a first rotating shaft is provided inside the mixing tank, and discharge pipes are connected and installed at both ends of the inner bottom of the mixing tank. The present invention can remove impurities from the raw materials, and then improve the mixing effect with the solvent to make it more sufficient.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

The invention provides a cobalt-based catalyst and a preparation method and application thereof, the chemical formula of the cobalt-based catalyst is Co (OH) x (CO3) 1-0.5 x, x is not higher than 2, and the cobalt-based catalyst has a nanofiber three-dimensional network structure. The cobalt-based catalyst provided by the invention has a nanofiber three-dimensional network structure, and the agglomeration phenomenon is greatly improved, so that the cobalt-based catalyst has a relatively high specific surface area, more active sites can be exposed, and the cobalt-based catalyst has excellent catalytic performance.

The invention discloses a method for recovering metal from electronic waste or leach residue thereof, the electronic waste or leach residue comprising copper element and one or more lithium compounds, the method comprising: leaching the electronic waste or leach residue with a leaching solution comprising ammonium sulfate in the presence of an oxidizing agent, a leaching solution containing copper ions and lithium ions and solid residues are provided; and separating the leachate and the solid residue.

A method of manufacturing a particulate transition metal carbonate material is described. The method includes mixing a transition metal precursor salt with a second salt in a liquid vehicle. A precipitation reaction is then performed to form a slurry of the particulate transition metal carbonate material in the liquid vehicle. The particulate transition metal carbonate material may find use as seeds in a subsequent precipitation reaction. Methods of manufacturing a particulate precursor materials are also described, including performing a precipitation reaction between one or more transition metal sources in the presence of seed particles in a reaction mixture within a precipitation reaction vessel, to form the particulate precursor material by precipitation onto the surface of the seed particles.

The application belongs to the technical field of new energy batteries, and particularly relates to a preparation method of aluminum-doped large-particle cobalt carbonate and application thereof. The preparation method of aluminum-doped large-particle cobalt carbonate disclosed by the application first prepares cobalt carbonate seeds, then continues to react after being separated into a kettle, and finally obtains aluminum-doped large-particle cobalt carbonate. By strictly controlling the process and process conditions of seed preparation and subsequent co-precipitation reaction, the uniformity of aluminum doping in cobalt carbonate is greatly improved, the aluminum distribution in the obtained tricobalt tetraoxide after calcination is more uniform, and the electrical performance of lithium ion batteries can be effectively improved. The preparation method of aluminum-doped large-particle cobalt carbonate disclosed by the application strictly controls the seed preparation process and the subsequent reaction process, so that the surface of the prepared cobalt carbonate particles is smoother, there is no segregation, and the sphericity is better, which is beneficial to improving the quality and service life of the final lithium ion battery product.

The application belongs to the technical field of water electrolysis catalysts, and discloses a NiFe-based bifunctional water decomposition electrocatalyst, a preparation method and application thereof, the catalyst is a core-shell heterostructure, a three-dimensional self-supporting NiFe-based OER / HER bifunctional electrocatalyst, specifically, a coral spherical NiFe-LDH coated basic cobalt carbonate nanowire nanomaterial NiFe-LDH@Co-CH / NF with a three-dimensional hierarchical porous core-shell heterostructure; the catalyst is prepared by a two-step method of hydrothermal and solvothermal, and the foam nickel is used as a conductive substrate, the inner layer is the basic cobalt carbonate nanowire, and the outer layer is the NiFe-LDH nanosheet. The catalyst has excellent OER and HER performance, significantly accelerates the diffusion and transfer of the electrolyte solution, excites the synergistic effect and electron transfer, and improves the catalytic activity of the catalyst. The water electrolysis system assembled by the catalyst has excellent water electrolysis performance, and has a wide application prospect.

The application provides an aluminum-manganese-nickel co-doped cobalt carbonate precursor and a preparation method and use thereof. The preparation method comprises the following steps: mixing a cobalt-aluminum mixed salt solution, a manganese salt solution, a nickel salt solution and a precipitant solution, and performing a co-precipitation reaction to obtain the aluminum-manganese-nickel co-doped cobalt carbonate precursor; wherein the cobalt-aluminum mixed salt solution comprises a complexing agent; the manganese salt solution comprises a first surfactant and a second surfactant, the first surfactant comprises a crown ether surfactant, and the second surfactant comprises a non-ionic surfactant. The preparation method provided by the application realizes uniform doping of aluminum, manganese and nickel in the cobalt carbonate precursor material, not only reduces the risk of low capacity caused by only increasing the aluminum content, but also reduces the risk of small particle explosion in the reaction process, so that the obtained tricobalt tetraoxide precursor material has uniform particle size and uniform distribution of doped elements.

The present invention provides a method for producing high-purity cobalt sulfate by separating impurities and cobalt from a cobalt chloride solution containing impurities without using an electrolysis process. The method sequentially implements the following steps: a decoppering step (S1), in which a sulfiding agent is added to a cobalt chloride solution containing one or more impurities selected from copper, zinc, manganese, calcium, and magnesium to form a copper sulfide precipitate, which is then separated and removed; a neutralization step (S2), in which a neutralizing agent or a carbonating agent is added to the cobalt chloride solution that has undergone the decoppering step (S1), to form cobalt hydroxide or alkaline cobalt carbonate, thereby separating the magnesium; a leaching step (S3), in which sulfuric acid is added to the cobalt hydroxide or alkaline cobalt carbonate to obtain a cobalt sulfate solution; and a solvent extraction step (S4), in which an organic solvent containing an alkylphosphoric acid-based extractant is brought into contact with the cobalt sulfate solution to extract zinc, manganese, and calcium into the organic solvent for separation and removal. The addition of the neutralizing agent or carbonating agent in the neutralization step (S2) is performed using a countercurrent multi-stage process.

The invention discloses a cobalt carbonate material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The cobalt carbonate material comprises an outer layer area and an inner layer area located on the inner side of the outer layer area, the inner layer area refers to an area formed by extending from the particle center of the cobalt carbonate material to the particle surface by the distance of (0.67-0.76) r, and r refers to the radius of the cobalt carbonate material particle; the cobalt carbonate material has a diffraction peak of a (101) crystal face in an X-ray diffraction pattern; the ratio of the diffraction peak intensity of the (101) crystal face of the cobalt carbonate material to the diffraction peak intensity of the (101) crystal face of the inner layer region is x1, and x1 is greater than 1.7; the cobalt carbonate material comprises a cobalt carbonate matrix and a nickel element doped into the cobalt carbonate matrix, and the phenomena of breaking, powder floating and the like during subsequent sintering preparation of the high-nickel-doped cobaltosic oxide material are avoided.

The present invention provides a method for preparing high-density small-particle cobalt carbonate, prepares a cobalt salt solution and an ammonium bicarbonate solution, adds them to a reaction vessel in a continuous feeding manner and reacts; in the initial stage of the continuous feeding stage, stops feeding at intervals and performs aging treatment, and continues to react after several agings until the seed crystal grows to a certain particle size; stops settling, siphons the supernatant, and then adopts a one-time feeding method to add the reaction solution to the reaction vessel, and continues to react under closed conditions to obtain a cobalt carbonate slurry; after washing, separation and drying, a high-density small-particle cobalt carbonate is obtained. The present invention is regularly aged at the initial stage of the reaction, effectively improving the defects of the seed crystal such as loose structure and poor density in the generation stage; adopts a combination of a continuous feeding method and a one-time feeding method, and in the crystal growth stage, the reaction time is effectively shortened by a one-time feeding, the production efficiency is improved, and the density and particle size consistency of the particles are further improved.

The invention discloses cobalt carbonate, a preparation method and application, the cobalt carbonate comprises a cobalt carbonate inner core and an aluminum-doped cobalt carbonate coating layer coating the cobalt carbonate inner core, and the pore volume of the cobalt carbonate inner core is smaller than that of the cobalt carbonate. The cobalt carbonate in the application has a synergistic effect between a gradient pore structure and gradient aluminum doping distribution, so that the problem that cobalt carbonate particles are easy to crack and remove powder during sintering is solved, the sintered cobaltosic oxide can be kept to have relatively excellent tap density and mechanical strength, and the electrochemical performance of lithium cobalt oxide is further improved.

A bimodal lithium transition metal oxide based powder mixture comprises a first and a second lithium transition metal oxide based powder. The first powder comprises particles of a material A comprising the elements Li, a transition metal based composition M and oxygen. The first powder has a particle size distribution characterized by a (D90−D10) / D50≤1.5. The second powder comprises a material B having single crystal particles, said particles having a general formula Li+bN′−bO2, wherein −0.03≤b≤0.10, and N′=NixM″yCozEd, wherein 0.30≤x≤0.92, 0.05≤y≤0.40, 0.05≤z≤0.40 and 0≤d≤0.10, wherein M″ is one or both of Mn or Al, and E is a dopant different from M″. The first powder has an average particle size D50 between 10 and 40 μm. The second powder has a D50 between 2 and 4.5 μm. The weight ratio of the second powder in the mixture is between 15 and 60 wt %.

The invention provides basic cobalt carbonate with high carbonate content and a preparation method thereof, and belongs to the technical field of cobalt compound preparation. The basic cobalt carbonate can be used as a cobalt source or a cobalt compound precursor for a positive electrode material. The method comprises the following steps: introducing carbon dioxide into a sodium carbonate solution in advance to obtain a pre-carbonized sodium carbonate solution; synchronously dropwise adding the pre-carbonized sodium carbonate solution and the cobaltous sulfate solution for reaction under the condition of partial pressure of carbon dioxide, and controlling the pH value of the reaction solution to obtain reaction slurry; aging the reaction slurry under a carbon dioxide pressurization condition, regulating the pH value, and filtering to obtain a wet filter cake; the wet filter cake is sequentially subjected to sodium bicarbonate solution replacement washing and carbon dioxide saturated deionized water washing, then dried, smashed and screened, and a product is obtained; the method disclosed by the invention is beneficial to improving the carbonate introduction degree of basic cobalt carbonate and reducing soluble salt entrainment, and few insoluble residues are generated in acid medium dissolution evaluation.

The application provides a gradient washing method of cobalt carbonate, which comprises the following steps: first washing cobalt carbonate by using a washing liquid with a temperature of T1 at a flow rate of v1; then continuing to wash by using a washing liquid with a temperature of T2 at a flow rate of v2, and performing solid-liquid separation after the second washing to obtain washed cobalt carbonate; wherein T2 is less than T1, and v2 is greater than v1. The gradient washing method of cobalt carbonate can not only significantly reduce water consumption and energy consumption in the washing process, realize efficient and uniform removal of impurities, but also can simultaneously maintain the sphericity and surface state of cobalt carbonate particles by the cooperation of high-temperature low-flow and low-temperature high-flow washing.

The present invention belongs to the technical field of water treatment, and discloses an amorphous cobalt basic carbonate, a preparation method thereof and an application thereof. The preparation method comprises the following steps: S1. Mix cobalt nitrate hexahydrate and ethylene glycol to form a uniformly dispersed solution; S2. Control the temperature of the solution obtained in step S1 at 140-220 °C for solvent thermal reaction for 8-24 h; S3. Wash and dry the product obtained in step S2 to obtain amorphous cobalt basic carbonate. The application of amorphous cobalt basic carbonate as an adsorbent. The amorphous cobalt basic carbonate material prepared by the present invention has an ultra-high tetracycline adsorption capacity (up to 2746 mg / g), good cost-effectiveness, low biological toxicity and excellent recycling performance, and can efficiently remove tetracycline in water bodies.

A process for producing a copper-doped lithium cobalt oxide precursor, comprising the following steps: (1) Mixing a solution of soluble cobalt copper salt, urea and a carbon source to conduct a hydrothermal reaction to obtain a mixed solution; (2) subjecting the mixed solution obtained in step (1) to solid-liquid separation, washing, and drying a resulting solid product to obtain the copper-doped lithium cobalt oxide precursor; wherein the carbon source is at least one selected from the group consisting of glucose, fructose, galactose, lactose, and maltose.

The present invention belongs to the technical field of lithium ion battery positive electrode materials, and disclosed are a preparation method for a nano lithium cobalt oxide positive electrode mate

There is provided method of recovering material from a source material comprising one or more target metals. Also provided is a leach tank for leaching a material from a source material comprising one or more target metals, as well as an apparatus for recovering material from a source material containing one or more target metals. Also described is a system for recovering material from a source material comprising one or more target metals as well as the use of any of the aforementioned to recover material from a source material. A lithium leach solution, a mixed metal precipitate, a composition, a cathode active material, and a graphite material are also described.

The invention provides a preparation method of single-crystal lamellar aluminum-doped cobalt carbonate, which comprises the following steps: preparing lamellar aluminum-doped cobalt carbonate particles by using cobalt salt, ammonium bicarbonate and a dopant as raw materials through a liquid phase precipitation method, and sequentially comprises a low-temperature high-pH-value nucleation stage, a high-temperature high-pH-value nucleation stage, a high-temperature high-pH-value nucleation stage, a high-temperature high-pH-value nucleation stage and a high-temperature high-pH-value nucleation stage, the aluminum-doped cobalt carbonate is prepared in the high-temperature large-flow crystal nucleus growth and aging stage, the aluminum-doped cobalt carbonate is a flaky primary particle aggregate, primary particles are compact and uniform in size, the material structure is beneficial to impurity element desorption and dehydration performance improvement in the washing stage, the product drying efficiency is improved, and the product quality is improved. And drying and crushing to obtain the single crystal lamellar aluminum-doped cobalt carbonate. The method disclosed by the invention has the advantages of simplicity in operation, high production efficiency, no need of a dispersing agent, high washing efficiency and the like, the prepared single-crystal lamellar aluminum-doped cobalt carbonate takes the doped aluminum element as an inducer to realize high selectivity and accuracy of a material deposition crystal face, cobalt and the aluminum element form a solid solution, the aluminum is uniformly dispersed in cobalt carbonate precipitate, and the crystal surface of the single-crystal lamellar aluminum-doped cobalt carbonate is prepared. The particle size is nanoscale, the surface is smooth, flat and compact, the thickness is uniform, and the application potential of the cobalt carbonate nano material is expanded.

The invention provides a method for recycling a waste lithium ion battery positive electrode material through carbon dioxide laser thermal irradiation, and relates to the technical field of lithium ion battery recycling. The method for recycling the positive electrode material of the waste lithium ion battery through carbon dioxide laser thermal irradiation comprises the following steps: paving and fixing a positive electrode plate of the waste lithium ion battery on a glass plate, and scanning the positive electrode plate by adopting carbon dioxide laser; and after laser irradiation, active substances on the positive plate of the waste lithium ion battery are separated from the current collector aluminum foil. The collected active substances are ground and then dispersed in a low-concentration acid solution to be leached, and then a solution containing Li < + >, Co < 2 + >, Ni < 2 + > and Mn < 2 + > is obtained. The technical effects of improving the metal recovery efficiency and reducing the environmental pollution can be achieved by treating the waste positive plate through laser irradiation.

The application provides a seed crystal for carbon dioxide fixation, and a preparation method and application thereof, and belongs to the technical field of environmental protection and water treatment. The seed crystal comprises a carrier material and basic active sites loaded on the carrier material; and the material of the basic active sites comprises one or more of alkali metal oxides and alkaline earth metal oxides. The seed crystal provided by the application can be applied to a seed crystal granulation process, the basic active sites on the surface of the seed crystal can consume a large amount of hydrogen ions, accelerate the dissolution and hydrolysis process of gaseous carbon dioxide, convert the gaseous carbon dioxide into carbonate ions in a high-efficient manner, and then induce metal ions to crystallize on the surface of the seed crystal in the form of carbonate precipitation, so that carbonate granules are formed, and the mineralization and fixation of carbon dioxide and the high-efficient removal and granulation recovery of metal ions in wastewater are simultaneously achieved.

A method of manufacturing a particulate precursor material, comprising providing a suspension of seed particles in a liquid vehicle. A precipitation reaction involving one or more transition metal sou