20 results about "Cobalt phosphate" patented technology

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

This disclosure provides systems, methods, and apparatus related to lithium-ion batteries. In one aspect, a method includes synthesizing an intermediate selected from a group of a nickel-manganese-cobalt nitrate, a nickel-manganese-cobalt acetate, a nickel-manganese-cobalt sulfate, a nickel-manganese-cobalt chloride, and a nickel-manganese-cobalt phosphate. The intermediate is mixed with a lithium salt selected from a group of LiOH, LiCl, LiNO3, LiSO4, LiF, LiBr, Li3PO4, Li2CO3, and combinations thereof to form a mixture. The mixture is annealed at a sequence of temperatures and times to form a plurality of single crystals of a lithium nickel-manganese-cobalt oxide, with no cooling of the mixture between operations of the sequence of temperatures and times.

Provided is an industrially advantageous method by which it is possible to obtain, at a high yield, lithium cobalt phosphate having a single phase in X-ray diffraction measurements. A method for producing lithium cobalt phosphate according to the present invention is characterized by having: a first step for adding a carboxylic acid, cobalt hydroxide and, if necessary, a hydroxide of a metal (M) to an aqueous solvent, and then adding lithium carbonate to prepare an aqueous slurry (1); a second step for subjecting the aqueous slurry (1) to a wet grinding treatment using a media mill to obtain a slurry (2) containing a ground product; a third step for adding phosphoric acid to the slurry (2) containing a ground product so as to obtain a mixed raw material slurry (3); a fourth step for spray drying the mixed raw material slurry (3) to obtain a reaction precursor; and a fifth step for firing the reaction precursor.

To provide a method which can obtain cobalt lithium phosphate which is a single-phase in terms of x-ray diffractometry, with high yield in an industrially advantageous way.SOLUTION: A production method of cobalt lithium phosphate includes: a first step of adding carboxylic acid, cobalt hydroxide, and, if necessary, a metal (M) hydroxide to an aqueous solvent and then adding lithium carbonate to prepare aqueous slurry (1); a second step of wet milling-treating the aqueous slurry (1) with a media mill to obtain slurry (2) containing a milling treated product; a third step of adding phosphoric acid to the slurry (2) containing the milling treated product to obtain mixed raw material slurry (3); a fourth step of spray drying-treating the mixed raw material slurry (3) to obtain a reaction precursor; and a fifth step of firing the reaction precursor.SELECTED DRAWING: None

The present application discloses a preparation method of a cathode material with a coating layer, a lithium battery and an electric vehicle. The method includes: under the condition of the presence of a complexing agent, causing a soluble metal salt and an alkaline substance to undergo a coprecipitation reaction in a solvent; under the condition that the pH value is 9-13, causing the precipitate on the surface layer of the precursor precipitate to be in-situ converted into a phosphate precipitate, obtaining a precursor with a phosphate precipitate coating layer on the surface, and obtaining a second solid-liquid mixture; aging the second solid-liquid mixture to enable nickel phosphate, cobalt phosphate and manganese phosphate to be adsorbed on the outer layer of the precursor with a phosphate precipitate coating layer; mixing the precursor with a lithium source and performing a high-temperature sintering treatment to obtain a cathode material with a coating layer. In the embodiment of the application, a precursor with a coating layer is obtained through the conversion of a phosphate precipitate; and through aging, free metal salt ions are adsorbed on the outer layer of the precursor as a coating layer, achieving the purpose of improving the utilization rate of raw materials.

The application belongs to the technical field of water conservancy and hydropower engineering, and discloses a repairing material for a water discharge structure and a preparation method thereof. The repairing material comprises cement, aggregate, water and a colorant. The proportioning of the cement, the aggregate, the water and the colorant is adjusted according to engineering requirements. The colorant comprises arsenic-molybdenum hybrid polyacid salt, potassium cobalt trioxalate and cobalt ammonium phosphate. The repairing material meets the performance requirements of the water discharge structure after concrete repair. On this basis, the repairing material can effectively cover up the concrete repair traces of the water discharge structure and improve the aesthetic appearance of the water discharge structure. In addition, the repairing material can gradually change the color of the repaired part through heating and xenon lamp irradiation, so that the amount of the colorant to be added is not required to be found through multiple tests, thereby saving time and materials.

The invention discloses a carbon-loaded cobalt phosphate nanodot material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The preparation method of the carbon-loaded cobalt phosphate nanodot material comprises the following steps: S01, adding cobaltosic oxide into a first solvent, and carrying out ultrasonic dispersion and uniform mixing to obtain a cobaltosic oxide dispersion solution; s02, adding organic phosphonic acid and a second solvent into the cobaltosic oxide dispersion solution, and reacting in a nitrogen environment; after the reaction is finished, cooling to room temperature, and centrifuging the mixed solution to obtain a sample containing impurities; adding a washing solution for soaking and stirring; centrifuging the product, and drying to obtain a precursor material; and S03, carrying out annealing treatment on the precursor material in a vacuum environment or a nitrogen environment to obtain the carbon-loaded cobalt phosphate nanodot material. The carbon-loaded cobalt phosphate nanodot electro-catalytic material with high purity, good dispersity and uniform size is obtained, and shows excellent electro-catalytic activity in oxygen evolution reaction.

This invention discloses a Co x P@N-C / CC Flexible Integrated Lithium-ion Battery Anode Material, Its Preparation Method and Application, Cobalt Phosphate (Co) Formed on the Surface of a Flexible Carbon Material Matrix (CC) x The composite layer is doped with P and N-C, and has a line-sheet interwoven morphology; among which, cobalt phosphide Co x In P, 1 < x < 2. The method of this invention synthesizes a cobalt-containing precursor grown in situ on carbon cloth via hydrothermal synthesis. The dopamine-coated cobalt precursor on the carbon cloth undergoes low-temperature gas-phase phosphating. During the phosphating process, the outer dopamine coating is carbonized, thereby obtaining Co. x P@N-C / CC flexible integrated electrode. This invention, Co... x The P@N-C / CC self-supporting flexible electrode can be directly sliced ​​as a negative electrode for lithium-ion batteries and has a unique interwoven wire-sheet morphology structure. This structure can effectively enhance ion transport, and the nitrogen-doped carbon outer layer can improve the conductivity of the material and alleviate the volume expansion of the material during charging and discharging. Therefore, it achieves high capacity and high stability electrochemical performance.

The present invention discloses a nickel cobalt phosphate @ indium zinc sulfide @ cobalt oxide composite photocatalyst, its preparation method and application, belonging to the field of photocatalysis. The preparation process is: after the aqueous solution of nickel source and cobalt source and the aqueous solution of phosphine source are mixed and reacted; the solid is calcined to obtain Ni2CoPO x , Ni2CoPO x Add to the ZnIn2S4 precursor solution; after the reaction is completed, Ni2CoPO x @ZnIn2S4. Dissolve polyvinyl pyrrolidone in a mixed solvent of distilled water and methanol, then add Ni2CoPO x @ZnIn2S4, add tributylphosphine dropwise and stir; then add cobalt chloride solution dropwise and stir at room temperature until the reaction is complete; centrifuge, collect the solid, wash, and dry to obtain Ni2CoPO x @ZnIn2S4@CoO x Composite photocatalyst. Ni2CoPO x and CoO x It can serve as an active site for water oxidation to produce hydrogen peroxide. x and CoO x The introduction of clusters can effectively improve the separation efficiency of photogenerated carriers, enhance the light absorption capacity, and thus significantly improve the photocatalytic water splitting performance. x @ZnIn2S4@CoO x The hydrogen production rate of the composite photocatalyst was 1541.2 μmol·g ‑1 ·h ‑1 The hydrogen peroxide production rate reached 1381.1 μmol·g ‑1 ·h ‑1 .

The application discloses a hemoglobin-cobalt phosphate-cobalt phosphate iron hybrid nanoflower and a preparation method and application thereof, and belongs to the technical field of composite materials. The hemoglobin-cobalt phosphate-cobalt phosphate iron hybrid nanoflower is obtained by sequentially adding water-soluble starch, bovine hemoglobin freeze-dried powder, CoSO4 solution, PBS solution, FeSO4 solution and PBS solution into an aqueous solution in an oxygen-free and continuously stirred state through a one-pot method, and then standing and reacting. The synthesis method is simple in process, easy in raw material obtaining, green and environment-friendly, does not need special equipment, and can be prepared in batches. The prepared nanoflower is in the shape of a rose flower, has a large specific surface area and rich electric active centers. The synergistic effect between iron and cobalt ions not only promotes the exchange of electrons between the electric active centers and catalytic substrates, but also improves the intrinsic conductivity of the organic-inorganic hybrid nanoflower, accelerates the electron transmission between the electric active centers and the electrode, and can efficiently catalyze the reduction of hydrogen peroxide.

The application provides a lithium cobalt phosphate positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing and heating a divalent cobalt source, a ferrous source, a phosphorus source, a complexing agent and a solvent, and then performing solid-liquid separation to obtain a cobalt iron phosphate precursor; mixing a lithium source, a supplementary phosphorus source and the cobalt iron phosphate precursor in step (1) and performing primary sintering to obtain the lithium cobalt phosphate positive electrode material. The preparation method can inhibit lithium cobalt dislocation of the lithium cobalt phosphate in the charging and discharging process by preparing the cobalt iron phosphate first and taking the cobalt iron phosphate as a precursor, so that the capacity and cycle performance of the lithium cobalt phosphate positive electrode material are significantly improved.

Provided is an industrially advantageous method by which it is possible to obtain, at a high yield, lithium cobalt phosphate having a single phase in X-ray diffraction measurements. A method for producing lithium cobalt phosphate according to the present invention is characterized by having: a first step for adding a carboxylic acid, cobalt hydroxide and, if necessary, a hydroxide of a metal (M) to an aqueous solvent, and then adding lithium carbonate to prepare an aqueous slurry (1); a second step for subjecting the aqueous slurry (1) to a wet grinding treatment using a media mill to obtain a slurry (2) containing a ground product; a third step for adding phosphoric acid to the slurry (2) containing a ground product so as to obtain a mixed raw material slurry (3); a fourth step for spray drying the mixed raw material slurry (3) to obtain a reaction precursor; and a fifth step for firing the reaction precursor.

The application discloses a kind of eight hydrated cobalt phosphate nanoflower and titanium alloy cold rolling lubricant, first, divalent soluble cobalt salt solution is added dropwise in the phosphate buffer solution being stirred, stir until it changes from purple solution to a large number of pink precipitate, separate pink precipitate and obtain cobalt phosphate nanoflower.The eight hydrated cobalt phosphate nanoflower is composed of thick slices with different growth directions, and each thick slice is stacked by 4nm or so multilayer slices.Then the eight hydrated cobalt phosphate nanoflower is dispersed in the cold rolling lubricating base liquid to obtain a titanium alloy cold rolling lubricant, which is used in the cold rolling process of titanium alloy, has good lubricating effect and boundary lubrication performance, can also significantly improve the wear resistance, effectively reduces the occurrence of scratch, pull flower, scratch, sintering, welding, pull explosion and other phenomena.

To provide a method capable of obtaining X-ray diffractometrically single-phase lithium cobalt phosphate in a high yield by an industrially advantageous method.SOLUTION: A production method for lithium cobalt phosphate comprises: a first step of adding and mixing an organic acid having a carboxy group and a hydroxyl group, phosphoric acid, and, if necessary, a metal (M) source into an aqueous solvent, and then adding cobalt hydroxide to prepare a cobalt-containing raw material solution; a second step of adding a lithium source to the cobalt-containing raw material solution to obtain a cobalt-lithium-containing raw material solution; a third step of spray-drying the cobalt-lithium-containing raw material solution to obtain a reaction precursor; and a fourth step of calcining the reaction precursor.SELECTED DRAWING: None

The invention relates to a preparation method of a positive electrode active material, the positive electrode active material, a battery monomer and an electric device, which can be used for preparing the positive electrode active material with good stability and conductivity, so that the battery monomer with less side reaction is provided, and the service life and the energy density of the battery monomer are both considered. The preparation method of the positive electrode active material comprises the following steps: preparing a first solution which comprises an iron source and a first phosphorus source; spraying the first solution to the surface of cobalt phosphate, and carrying out heating drying and heat treatment to form iron phosphate coated cobalt phosphate; mixing the ferric phosphate coated cobalt phosphate, a carbon source, a lithium source, a second phosphorus source, an additive and a solvent, and performing spray drying and sintering treatment to form a positive active material; wherein the solvent comprises water.

The present application relates to a kind of narrow distribution spherical polyanionic sodium electric positive electrode material and its preparation method, its method includes: S1: cationic surfactant, organic ligand, metal salt are mixed to carry out supramolecular encapsulation, obtain pre-encapsulation solution;S2: pre-encapsulation solution, water, sodium source, cobalt source, phosphorus source and carbon source are mixed and ground, obtain nano slurry, then spray drying, obtain precursor particle;S3: precursor particle is pyrolyzed at 250 DEG C-450 DEG C, then it is densified at 450 DEG C-850 DEG C, obtain positive electrode material;Wherein, cationic surfactant is alkyl quaternary ammonium salt of carbon atom number 12-18;Organic ligand is polybasic organic carboxylic acid;Metal salt is at least one kind of water-soluble salt of magnesium, aluminum, zirconium, titanium in metal.The present application can solve the technical problems that existing sodium cobalt phosphate pyrophosphate positive electrode material preparation is difficult, morphology is poor and is prone to instability in prior art.

The present disclosure belongs to the field of battery materials, and discloses a coated nickel-rich ternary material and a preparation method and application thereof. The coated nickel-rich ternary material has a chemical formula of LiNixCoyMnzO2·a[M3(PO4)2·bH2O], Where 0.6≤x≤0.8, 0.1≤y≤0.2, 0.1≤z≤0.2, x+y+z=1, 0.01≤a≤0.03, 3≤b≤8, M3(PO4)2·bH2O is at least one selected from the group consisting of nickel phosphate, cobalt phosphate and manganese phosphate; the coated nickel-rich ternary material has a flower-like structure. The preparation method of the present disclosure provides phosphate ions through the prepared phosphate solution, performs coating in a liquid phase environment, and synthesizes the precursor simultaneously by microwave hydrothermal synthesis, which is beneficial to the full contact between the phosphates and the precursor, and ensures the surface of the nickel-rich ternary precursor is uniformly coated with the phosphates. The method is simple and has good coating effect.

The application discloses a modified cobalt phosphate / cobalt phosphide heterojunction composite material and a preparation method and application thereof, and comprises a base material and a carbon-coated cobalt phosphate / cobalt phosphide heterojunction nanosheet structure; the carbon-coated cobalt phosphate / cobalt phosphide heterojunction nanosheet structure is firmly anchored between the base material through a chemical bond; the cobalt phosphate / cobalt phosphide nanosheet structure exists in a heterojunction form; the size of the cobalt phosphate / cobalt phosphide nanosheet structure is 0.5-5 microns; and the thickness is 1-30 nanometers. The carbon-coated cobalt phosphate / cobalt phosphide heterojunction nanosheet structure is constructed on the base material, the catalytic performance of the catalytic material is effectively improved, and the catalytic material has the characteristics of recyclable and cyclic utilization.

The application discloses superfine pre-alloy powder, a preparation method thereof and a diamond sintered body. The superfine pre-alloy powder comprises the following components in percentage by weight: 30-50% of iron, 20-30% of cobalt, 25-40% of copper and 0.5-1% of phosphorus. The preparation method comprises the following steps: dissolving soluble acid salts of iron, cobalt and copper in water to prepare a metal ion solution; mixing the phosphate and the metal ion solution to prepare a mixed system; adding a weak base to the mixed system and stirring to generate a precipitate; washing the precipitate with water and then drying the precipitate to obtain a precursor; reducing the precursor to obtain the superfine pre-alloy powder; and the phosphate is at least one of iron phosphate, cobalt phosphate and copper phosphate. By introducing the appropriate amount of phosphorus element, the sintering temperature is reduced, the density of more than 98% can be achieved under the pressureless sintering at a temperature lower than 1000 DEG C, and the strength and hardness of the product are improved.

This invention discloses a polymer friction pair material for use in water-related applications and its preparation method. The composite material consists of cobalt phosphate nanomaterials and an ultra-high molecular weight polyethylene (UHMWPE) matrix, wherein the mass fraction of the cobalt phosphate nanomaterials is 1–10 wt.%. First, the cobalt phosphate nanomaterials are synthesized and then mechanically blended uniformly with the UHMWPE matrix powder. The mixed powder is placed in a mold, and a hot-pressing method is used to heat and mold the powder until it melts and solidifies. After cooling and demolding, the polymer friction pair material is obtained. This invention utilizes the rough-surfaced granular cobalt phosphate to increase the interfacial bonding force with the matrix, making it less prone to peeling off during friction, thus enhancing the polymer matrix's ability to withstand frictional loads and shear forces. Furthermore, the two-dimensional lamellar cobalt phosphate enters the friction interface to form a lubricating film, significantly improving the composite material's friction-reducing and wear-resistant properties, reliability, and service life.