293 results about "Cobalt carbonyl" patented technology

The invention discloses a preparation method of large-particle-size and high-density spherical cobalt oxide. The preparation method aims at achieving the purposes that the median particle size D50 of the cobalt oxide is larger than or equal to 15 microns, particle size distribution is uniform, compacting density (TD) is larger than or equal to 2.2 g/cm<3>, and the large-particle-size and high-density spherical cobalt oxide can meet the development requirement of high-voltage lithium cobaltate. The preparation method of the cobalt oxide includes the cobalt carbonate synthesis stage and the spherical cobalt carbonate thermal decomposition stage. In the cobalt carbonate synthesis stage, a cobalt carbonate precursor prepared through many times of cyclic crystallization is compact and uniform in particle size distribution; due to the segmented thermal decomposition, cobalt carbonate is locally decomposed in the low-temperature pre-decomposing stage, a micro hole channel is formed, release of CO2 gas during subsequent decomposition is facilitated, and particles are prevented from crazing or being broken; in the high-temperature thermal decomposition stage, the particle surface is compact, and therefore the large-particle-size and high-density spherical cobalt oxide is prepared.

The present invention relates to one kind of superfine cobalt powder and its production process. The production process includes the following steps: setting cobalt carbonate or cobalt oxalate powder, grinding dispersant and hard alloy balls in certain weight proportion into high energy ball mill pot; vacuumizing the ball mill pot and introducing protective argon; sealing the ball mill pot, and ball milling at controlled rotation speed to obtain superfine cobalt carbonate or cobalt oxalate powder; and reducing the superfine cobalt carbonate or cobalt oxalate powder in hydrogen atmosphere to obtain superfine cobalt powder in oxygen content not more than 0.5 % and granularity smaller than 0.6 micron. The superfine cobalt powder is applied in producing high quality hard alloy, and has simple production process and low cost.

A preparation method for a lithium cobalt oxide anode material relates to ananode material for lithium ion secondary batteries. The method comprises thefollowing steps: preparing a cobalt salt solution and a precipitator solution, precipitating a cobalt carbonate precursor by adopting a controlled crystallization process, and sintering cobalt carbonate to obtain cobaltosic oxide, wherein the cobalt carbonate precursor requires that the median diameter D50 ranges from 13-20 mum and the consistency is greater than or equal to 0.40 and smaller than or equal 0.50; mixing and then sintering the cobaltosic oxide, an additive and a lithium compound, milling and screening the product of sintering to obtain a lithium cobalt oxide semi-finished product; mixing thelithium compound and a coating element M, adding the mixture of the lithium compound and the coating element M and the lithium cobalt oxide semi-finished product into a ball mill for mixing, sintering the mixed materials, and milling and screening the product of sintering to obtain the lithium cobalt oxide anode material. The prepared lithium cobalt oxide product has the advantages that the size distribution of particles is uniform, and the product compaction densitycan be remarkably improved.

The invention provides a preparation method of semi-micrometer cobalt powder. The preparation method of the semi-micrometer cobalt powder is low in cost and simple and practical, and products by means of the preparation method are high in purity. The preparation method includes that cobalt carbonate sediments are produced through reaction of cobalt chloride and ammonium hydrogen carbonate, reaction of the cobalt carbonate sediments and oxalate solution is carried out, when the reaction is stopped, reaction products are directly crushed through drying and air flow by centrifugal spray drying equipment, and therefore precursor powder which is fine and even in particle size and sphere-like in particle shape and mixed by oxalate cobalt and cobalt carbonate. The precursor powder is reduced in a superfine powder hydrogen reduction furnace and then comes out of the furnace after reduction, and then the precursor powder is kept in nitrogen or carbon dioxide for 12-24 hours for passivating treatment. Afterwards, the precursor powder is crushed by the air flow, paraffin wax and oleic acid are added in the precursor powder, the precursor powder is packaged so as to prevent cobalt powder from oxidation, and finally superfine cobalt powder is obtained by vacuum package. The semi-micrometer cobalt powder obtained by means of the preparation method has the advantages of superfine cobalt powder and sphere-like cobalt powder, is fine in particle size, narrow in distribution, small and even in partical size and can be widely used in battery industries and hard alloy products like numerical blades, bar materials, holding-up hammers and drills.

The invention discloses a method for preparing a supercapacitor electrode material basic nickel-cobalt carbonate through a hydrothermal method. The method comprises the following steps that metal nickel salt and/or metal cobalt salt and urea are weighed separately and mixed with deionized water, and stirring is performed so that solids can be dissolved to obtain a mixed solution; the mixed solution is poured into a high-pressure reactor, sealing is performed for performing a reaction for 10-16 h under the temperature of 80-110 DEG C, and a reaction product is obtained; the reaction product is separated, washed and dried to obtain basic nickel-cobalt carbonate. According to the method for preparing the supercapacitor electrode material basic nickel-cobalt carbonate through the hydrothermal method, on the basis of control over raw material compatibility and reaction conditions, the three-dimensional porous structure and morphology can be obtained, sufficient wetting and permeation of an electrolyte are promoted, the superficial area of active substances is sufficiently utilized, and the electrochemical performance is improved.

The invention provides a preparation method for ultrapure ultrafine cobalt carbonate. The preparation method comprises the following steps: (1) adding a base reaction solution into a reaction vessel, adding a carbonate solution or bicarbonate solution and a cobalt salt solution into the base reaction solution, and carrying out a reaction under stirring so as to obtain slurry containing cobalt carbonate, wherein a mol ratio of carbonate or bicarbonate to cobalt ions in the cobalt salt is (3.0-6.0): 1, the pH value of a reaction system is 6.8 to 8.2, reaction temperature is 25 to 80 DEG C and reaction time is 0.5 to 3 h; (2) subjecting the slurry containing cobalt carbonate to solid-liquid separation so as to obtain a filter cake, conveying the filter cake to a slurrying tank for slurrying so as to obtain a slurried material, conveying the slurried material to a washing tank for washing at a constant temperature and carrying out solid-liquid separation after completion of washing so as to obtain a cobalt carbonate precipitate; and (3) drying, crushing and sieving the cobalt carbonate precipitate so as to obtain ultrapure ultrafine cobalt carbonate. The preparation method provided by the invention is low in cost, simple in process flow and easy to operate.

The invention provides a cobalt carbonate preparation method and a superfine cobalt powder preparation method, which are applicable to the technical field of cobalt powder preparation. The cobalt carbonate preparation method comprises the following steps of: mixing a cobalt salt solution and soluble carbonate or soluble hydrocarbonate under a condition with temperature of 0-30 DEG C and pH value of 5.5-8.0; carrying out millipore filtration on an obtained mixture after reaction; collecting and washing filter residues; drying the washed filter residues under a negative pressure condition at 50-80 DEG C, so as to obtain a cobalt carbonate precursor; and carrying out airflow crushing and classification on the cobalt carbonate precursor, so as to obtain cobalt carbonate. The cobalt carbonate preparation method and the superfine cobalt powder preparation method, provided by the invention, have the advantages of mild technical condition, high production benefits, low apparent density of the obtained cobalt carbonate and uniform particle size and is suitable for industrial production.

The invention discloses a method for preparing a cobalt-nickel sulfide counter electrode. The steps include: first step, hydrothermally reacting cobalt salt, nickel salt and excess sodium hydroxide or sodium carbonate at 120-200°C to generate hydrogen Oxycobalt nickel or basic cobalt nickel carbonate; the second step, mix the hydroxide cobalt nickel or basic cobalt nickel carbonate with a certain concentration of sulfur source aqueous solution, and heat it at 140-230 ° C; the third step is to generate the sulfur Cobalt nickel is made into a slurry and coated on a conductive substrate, and dried at room temperature. The electrode prepared by the invention does not need to be sintered under vacuum or protective atmosphere, and the preparation process is simple; the prepared cobalt-nickel sulfide counter electrode has high mechanical strength and no shedding phenomenon; Better electrocatalytic activity; Dye-sensitized solar cells assembled with cobalt-nickel sulfide electrodes obtained higher photoelectric conversion efficiency than dye-sensitized solar cells assembled with pyrolyzed Pt electrodes.

The invention discloses a cobalt carbonate and cobaltosic oxide granularity controlled production process. The cobalt carbonate and cobaltosic oxide granularity controlled production process comprisesthe steps: firstly, a cobalt chloride solution and an ammonium bicarbonate solution are fed into a seed crystal reaction kettle to react under reaction conditions; feeding of cobalt chloride is increased in the later stage to obtain seed crystal cobalt carbonate; then the cobalt carbonate is distributed in a finished product reaction kettle to react, in the reaction process, the feeding quantityof the ammonium bicarbonate solution is adjusted, the alkaline environment is gradually lowered to the weak alkali environment, and the weak alkali environment is maintained; the feeding quantity of the cobalt chloride is increased every a period of time in the middle and later periods of a reaction, and finally, finished cobalt carbonate particle products with the required particle size are obtained; and cobalt carbonate particles are washed and dried, and then subjected to aerobic calcination in a rotary kiln, and cobaltosic oxide black powder is obtained. The produced cobalt carbonate particles are good in compactness and uniform in morphology and granularity, the specific surface area is adjusted according to product demands, the cobalt carbonate particles can be well controlled in therequired granularity, and calcined cobaltosic oxide is uniform in granularity, compact in particle, and also uniform in morphology.

A preparation method of spherical cobaltosic oxide includes 1) preparing cobalt salt solution and enabling cobalt content in the cobalt salt solution to be 40-180g/L, 2) preparing precipitator solution, enabling density of the precipitator solution to be 60-300g/L and enabling solution temperature to be 20-70 DEG C, 3) combining cobalt carbonate, naturally combining two strands of cobalt salt and precipitator solution flows and enabling the flows to flow into a middle reaction tank and enabling reaction temperature to be 20-70 DEG C and reaction time to be 0.5-1h; 4) conducting centrifugal washing and dehydrating; and 5) burning the mixture into a product, placing dehydrated cobalt carbonate into a burning furnace, conducting burning for 4-10h under the temperature from 400 DEG C to 900 DEG C to obtain pure-phase cobaltosic oxide. The preparation method adopts two-strand natural flow combining mode to control crystallization and burning conditions, and the prepared cobaltosic oxide is the pure-phase cobaltosic oxide. The product is spherical in microcosmic appearance, even in size distribution, controllable in size and capable of meeting requirements of markets for diversification of product size and appearance.

The invention discloses a method for continuously preparing large-particle-size spherical cobalt carbonate. All the cobalt carbonate production methods in China at present adopt an intermitted technique which has the characteristics of aggregated particle, poor dispersity and poor flowability. The method comprises the following steps: by using pure water as bottom liquor, adding a parallel flow of an excessive 10-30% precipitant solution and a soluble cobalt salt-activator mixed solution into a reaction kettle while controlling the pH value at 6.5-7.5, the temperature at 30-90 DEG C and the stirring speed at 200-100 rpm; starting continuous feeding and continuous output when achieving the overflow port; and filtering the reaction product, washing and drying to obtain the large-particle-size spherical cobalt carbonate. The particle size of the cobalt carbonate product forms standard normal distribution; the cobalt carbonate product has the advantages of uniform particle and favorable flowability; and D50 is 15-30mm.

The invention discloses a method in which carbonylation reaction is carried out between an epoxy compound and carbon monoxide and alcohol in order to prepare optically active 3-hydroxy carboxylic ester. The method uses the chiral epoxy compound, the monohydric alcohol and the carbon monoxide as reactants, cobalt carbonyl as main reactive catalyzer and a heterocyclic compound containing nitrogen as cocatalyst to synthesize the optically active 3-hydroxy carboxylic ester under the controlled operational conditions of reaction pressure between 3.0 MPa and 10.0 MPa, reaction temperature between 50 DEG C and 150 DEG C and reaction time between 1 and 8 hours. Under the relatively mild conditions, the invention can realize high conversion rate of chiral epoxy dimethylmethane and high selectivity of 3-hydroxy carboxylic ester, and therefore the invention is a high-efficiency, economical, environment-friendly and conveniently operated catalyzer system.

The invention discloses a nanometer super fine cobalt powder preparing method and device, which comprises the following steps: (1)solution strength of CoCl2 is 70-120g/l; NH4 HCO3 liquor is saturation density; the reaction temperature is at 25-50deg, c; pH=7.2-7.5; adding in reactor speed of CoCl2 is 20-100L/min; NH4 HCO3 fat solution is 60-400L/min; the ageing time is 0.5-2.0 hour;(2) the nanometer super fine cobalt powder thermal reduction can use hydrogen to deacidize or heat decomposition in high-temperature electric resistance furnace at 300-500deg C. The intermediate section and front end of feed head of high-temperature electric resistance furnace jamb installs exhaust stabilivolt guide and mechanical pulling-boat-machine; the furnace body heating device installs independently in 5 to 8 sections; the oven tail installs two to three sections of double layer hydrocooling device and checking-valve and micromanometer. The invention has short process, which reduces the cost.

The invention relates to a method for preparing alkaline cobalt carbonate under hyper-gravity hydrothermal condition. The method comprises the following specific steps of: adding a certain amount of cobalt salt into deionized water to obtain a metal salt solution with the concentration between 0.1 mol/L and 2 mol/L; dissolving a corresponding chemical reagent which can produce CO3<2-> at the reaction temperature between 50 DEG C and 250 DEG C; adding a certain amount of organic solvent which has higher density in comparison with water and is insoluble in water or a water-soluble high molecular compound with density higher than that of water into the prepared solution, wherein the volume ratio of the organic solvent or the water-soluble high molecular compound to an aqueous solution is 1:1-1:100; filling the mixed solution into a reaction kettle, sealing, fixing the reaction kettle on a fixing bracket in a hearth and undergoing a hydrothermal reaction at certain temperature in the presence of hyper-gravity, wherein the reaction temperature is between 50 DEG C and 250 DEG C, the reaction time is between 0.1 hour and 5 hours, and relative centrifugal force is between 500/g and 10,000/g; and filtering, cleaning repeatedly and drying in vacuum to obtain a needed material. By adopting the method, a substrate-free alkaline cobalt carbonate membrane can be directly prepared; and equipment is simple, the reaction is easy to control, and industrialization is easy to realize.

The invention relates to the technical field of precursors of lithium cobalt oxide serving as a positive electrode material of a lithium ion battery, and particularly relates to an aluminum cobalt carbonate/cobalt carbonate composite spherical precursor and a preparation method thereof. The nano basic aluminum cobalt carbonate/cobalt carbonate composite spherical precursor is composite material formed by taking spherical cobalt carbonate as a main body material and uniformly distributing nano basic aluminum cobalt carbonate crystal particles in a bulk phase of the main body material, the expression of the composite material is (1-x)[CoCO3].x [Co6Al2CO3(OH)16.4H2O], and x is greater than or equal to 0.001 and less than or equal to 0.04. The product obtained by the invention has better aluminum distribution uniformity, is applied to the preparation of lithium cobalt oxide (LCO), is easier to uniformly dope Al into LCO crystal lattices, and has excellent high-voltage cycle performance.

The invention discloses a cobalt carbonate-polypyrrole composite anode material used for a power lithium ion battery and a preparation method thereof. The material is in a micro-nano-scale spheroid core-shell structure in which an exterior is a cobalt carbonate core which is coated by polypyrrole. The composite anode material is 3-5 [mu]m in particle sizes. The cobalt carbonate core is assembled by nanometer rods with widths being 20-50 nm. A thickness of a polypyrrole coating layer is 0.3-1 [mu]m. The polypyrrole coating layer is formed, in an aggregation manner, from polypyrrole nanometer particles with particle sizes being 50-100 nm. The preparation method includes following steps: dispersing CoCO3 powder into water in which a surfactant is dissolved to prepare a suspension; adding a pyrrole monomer to the suspension with mixing uniformly; adding ferric chloride to carry out a polymerization reaction; performing a filtering process and collecting a cobalt carbonate-polypyrrole precipitate after the reaction being finished; and performing a washing process and a drying process to obtain the cobalt carbonate-polypyrrole composite anode material. The composite anode material has excellent circulation stability, an excellent rate capability and a very strong capacity recovering capability. In addition, the preparation method is simple and is easy to carry out in large-scale production.

A preparation process for preparing organic cobalt salt compound mainly comprising cobalt neocaprate through the hybrid reaction between cobalt carbonate and organic acid belongs to the organic synthesis technical field. Taking cobalt carbonate as a raw material, the preparation process is characterized in that the process is carried out in turn according to the following steps that (1) taking cobalt carbonate, glacial acetic acid, neodecanoic acid and neopentanoic acid as raw materials, reaction is carried out inside a normal pressure sealed reactor for more than or equal to 3 hours with the temperature controlled between 90 and 100 DEG C; (2) abietic acid is added in the reaction system so as to carry out reaction at a temperature of between 160 and 168 DEG C for more than or equal to 1 hour, thereby displacing glacial acetic acid; then, cobalt neocaprate is generated through excluding displaced glacial acetic acid and water by means of vacuum reaction and filtration; and (3) activated calcium carbonate is added in the reaction system at a temperature of between 160 and 168 DEG C so as to prepare a finished product. Through replacing common cobalt hydroxide by cobalt carbonate to carry out reaction with organic acid, and adding abietic acid tackifier and activated calcium carbonate with amphoteric compound in neodecanoic acid, the preparation process effectively balances the pH degree in the system, thereby effectively preventing the product from metallic corrosion and increasing adhesion level.

The invention discloses a one-dimensional basic cobalt carbonate@two-dimensional CoSe/NF heterostructure composite material and a preparation method and an application thereof. The preparation methodcomprises the following step: carrying out a solvothermal reaction on a basic cobalt carbonate nanowire Co(CO3)0.5(OH).0.11H2O, a selenium source and a cobalt source in a solvent to prepare the one-dimensional basic cobalt carbonate@two-dimensional CoSe/NF heterostructure composite material, wherein the basic cobalt carbonate nanowire is loaded to foam nickel NF. The heterostructure composite material has excellent electrocatalytic and cyclic performance, so that the heterostructure composite material can be applied to electrocatalytic hydrolysis. Meanwhile, the preparation method has the advantages of being simple in process and low in price.

Cobalt silylamide and cobalt carbonyl precursors are described, which are usefully employed in vapor deposition processes, such as chemical vapor deposition and atomic layer deposition, to deposit cobalt and to form high purity cobalt-containing films at temperatures below 400° C. These precursors and processes can be utilized in the manufacture of integrated circuitry and production of devices such as microprocessors, and logic and memory chips.

The invention relates to an octahydro cyclopentenopyridine (c) carboxylic acid derivative and a preparing method thereof, providing basis for designing and preparing compounds with different biological activities. A chemical structural formula is shown in the fight formula, wherein, R1 is one of alkoxy, bydroxy and amine. R2 and R3 are one of bydroxy, fluorine and hydrogen. N protecting group is tertbutyloxycarbonyl, benzyloxycarbonyl or benzyl. The compounds are optically pure. Starting from natural methionine ester or hydrochloride thereof, the compound of (S)-2-((benzyloxycarbonyl)(propargyl)-amine)butane-3-carboxylic ester (5) is obtained through substitution, oxidation and elimination. After reactions of cobalt carbonyl catalytic cyclization, and the like, (S)-2-benzyloxycarbonyl-5-octahydro cyclopentenopyridine (c)-1- carboxylic ester is obtained. Series of deritative compounds are obtained through reduction of carbonyl, fluorination, chiral separation, hydrolysis and condensation.

The invention discloses a preparation method of cobalt carbonate for a battery. The preparation method comprises the following steps of: firstly adding an ammonium bicarbonate solution as a base solution; then adding a cobalt liquid for the neutralization precipitation reaction again; adding the ammonium bicarbonate solution and the cobalt liquid at the same time to a reaction system by adopting a simultaneous feeding mode till the pH of the reaction system is 6-7; moreover, keeping the pH of the whole system to be stabled to be 6-8 in the feeding process; also monitoring the dimension of cobalt carbonate particles; stopping feeding when D50 in the average particle size distribution index of cobalt carbonate reaches the stipulated requirement, thus the whole neutralization precipitation reaction is finished; and filtering and drying discharged materials after the reaction products in a reaction tank is subjected to heat preservation and aging continuously, thereby obtaining the required cobalt carbonate. The preparation method provided by the invention is simple and has low cost, two stage matching of the neutralization precipitation reaction is reasonable, the appropriate matched parameters are optimized, thereby preparing and obtaining the similar-spherical cobalt carbonate with great apparent density and uniform and controllable particle size.