159 results about "Cobalt phosphate" patented technology

The present invention comprises a blend of polyester and a partially aromatic polyamide with an ionic compatibilizer and a cobalt salt. This blend can be processed into a container that has both active and passive oxygen barrier and carbon dioxide barrier properties at an improved color and clarity than containers known in the art. The partially aromatic polyamide is preferably meta-xylylene adipamide. The ionic compatibilizer is preferably 5-sodiumsulfoisophthalic acid or 5-zincsulfoisophthalic acid, or their dialkyl esters such as the dimethyl ester (SIM) and glycol ester (SIPEG). The cobalt salt is selected form the class of cobalt acetate, cobalt carbonate, cobalt chloride, cobalt hydroxide, cobalt naphthenate, cobalt oleate, cobalt linoleate, cobalt octoate, cobalt stearate, cobalt nitrate, cobalt phosphate, cobalt sulfate, cobalt (ethylene glycolate), or mixtures of two or more of these. The partially aromatic polyamide is present in a range from about 1 to about 10 wt. % of said composition. The ionic compatibilizer is present in a range from about 0.1 to about 2.0 mol-% of said composition. The cobalt salt is present in a range from about 20 to about 500 ppm of said composition.

An air cathode for a metal-air battery is disclosed which contains a catalyst chosen to make the metal air battery more easily rechargeable. This catalyst is based on cobalt phosphate, cobalt borate mixed metal cobalt phosphates, mixed metal cobalt borates, or mixed metal cobalt phosphate borates.

This invention relates to electrode active materials, electrodes, and batteries. In particular, this invention relates to active materials comprising lithium or other alkali metals, iron, cobalt, and other transition metals, and phosphates or similar moieties.

The invention relates to graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof and relates to lithium-ion battery anode materials. The graphene composite carbon-coated cobalt-lithium phosphate material comprises cobalt-lithium phosphate, graphene and carbon which are composited through in-situ symbiosis, and the graphene and the carbon generated in situ form a three-dimensional conductive network. The first preparation method includes: dissolving a lithium source, a cobalt source, a phosphorus source and an organic carbon source into water to obtain solution A; dispersing graphene in anhydrous ethanol to obtain solution B; mixing the solution A and the solution B, spray drying to obtain precursor powder, calcining under protective atmosphere, and cooling to room temperature to obtain the graphene composite carbon-coated cobalt-lithium phosphate material. The second preparation method includes: dissolving a lithium source, a cobalt source and a phosphorus source into water, and spray drying to obtain cobalt-lithium phosphate precursor; mixing the cobalt-lithium phosphate precursor with graphene and an organic carbon source, calcining under protective atmosphere, and cooling to room temperature to obtain the graphene composite carbon-coated cobalt-lithium phosphate material. The graphene composite carbon-coated cobalt-lithium phosphate material can be used as the anode material to apply to lithium-ion batteries.

The invention discloses a synthetic method for a cathode material lithium cobaltous phosphate used for lithium ion batteries. The method comprises a step of dissolving cobaltous acetate in deionized water to prepare an aqueous solution of the cobaltous acetate; a step of dissolving lithium hydroxide and sucrose in deionized water to prepare a lithium hydroxide/sucrose mixed solution; a step of adding phosphoric acid in deionized water to prepare a phosphoric acid solution; a step of adding the phosphoric acid solution into the aqueous solution of the cobaltous acetate to obtain a burgundy emulsion, stirring uniformly, adding the lithium hydroxide/sucrose mixed solution into the burgundy emulsion, mixing uniformly, and adding nitric acid to obtain a precursor solution; a step of subjecting the precursor solution under stirring to spray drying to obtain a precursor of lithium cobaltous phosphate powder; and a step of subjecting the precursor of the lithium cobaltous phosphate powder to vacuum calcination at 600-750 DEG C for 16-26 h to obtain the cathode material lithium cobaltous phosphate with a spherical porous structure and a high specific capacity.

The invention discloses a preparation method of cobalt phosphate powder material. The method comprises the steps of reacting soluble cobalt salt and soluble phosphate to obtain precipitate cobalt phosphate, and then adjusting the reaction system to be neutral with ammonia water; then carrying out suction filtration on the reaction system, washing, drying, grinding, and screening to obtain the cobalt phosphate powder material. The preparation method is simple, convenient to operate and low in cost; furthermore, the obtained product cobalt phosphate powder material is less in impurity content; the morphology and the particle size of the cobalt phosphate powder material obtained by the preparation technology are controllable, so that the demands on different battery materials can be met.

The invention discloses a Fe-doped hydroxyl cobalt phosphite nanosheet array structure material as well as a preparation method and application thereof. The preparation method comprises the followingsteps: dissolving ferric salt, cobalt salt and sodium hypophosphite into a mixed solvent of water and isopropanol; transferring the solution into a reaction kettle; obliquely putting foamed nickel into the solution for carrying out a solvothermal reaction, and cooling to room temperature after the reaction is finished; and washing and drying the product, so that the Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure material can be prepared. According to the invention, a Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure is designed and synthesized on a foamed nickel substrate; an electronicstructure of Co11(HPO3)8(OH)6 can be effectively adjusted by utilizing Fe doping, thereby reducing resistance, increasing active sites, improving hydrophilicity, and accelerating electron transfer rates; and the Fe-doped Co11(HPO3)8(OH)6 nanosheet array structure material is used as an electrocatalyst for oxygen evolution reaction, hydrogen evolution reaction and total hydrolysis reaction, has the advantages of high activity, good durability, simple preparation process and low cost, and has a very high value for researching the practical application of a water decomposition electrocatalytic electrode material.

The invention discloses a cobalt phosphate nano-material as well as a preparation method and application thereof. A chemical general formula of phosphate is Co3(OH)2(HPO4)2, an auxiliary preparation size of a surfactant polyvinylpyrrolidone (PVP) is the nano-material of 0.5 micrometer to 1 micrometer. A surfactant auxiliary hydrothermal method is adopted, the preparation method disclosed by the invention has the advantages of being simple, easy to operate, low in cost, and environment-friendly, and a whole reaction process does not need special equipment, industrial production is facilitated,and the quality of the finally obtained product is higher. According to the phosphate nano-material prepared by adopting the method, the advantages of high conductivity of the material, more active sites, high electrocatalytic activity and the like are realized at the same time. The preparation material is a desired oxygen evolution reaction electrocatalytic material which has wide commercializedapplication prospect.

Disclosed is an insulating film composition of a non-oriented electrical steel sheet. The insulating film composition of a non-oriented electrical steel sheet according to the present invention comprises a mixed metal phosphate consisting of aluminum phosphate (Al(H₃PO₄)_x=1-3) and cobalt phosphate (Co(H₃PO₄)₃), and an organic/inorganic composite consisting of epoxy resin and silica (SiO₂) nanoparticle substituted on the functional group of the epoxy resin.

The invention relates to preparation of a lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for a lithium ion battery. The chemical formula of the composite material is xLiCoPO4-yLi3V2(PO4)3, wherein 0<x<=5, 0<y<=5. The preparation steps are as follows: uniformly mixing compounds of a lithium source, a cobalt source, a vanadium source and a phosphorus source; adding a carbon source and an ethyl alcohol solution, and then ball-milling in a planetary ball mill, so as to obtain precursor powder; drying in a drying oven; and transferring to a tube furnace and roasting twice, so as to obtain the target object. The preparation of the lithium cobalt phosphate-lithium vanadium phosphate composite positive electrode material for a lithium ion battery, provided by the invention has the advantages that the new-type lithium cobalt phosphate-lithium vanadium phosphate positive electrode material for the lithium ion battery is synthesized by utilizing a solid phase method for the first time, through complementation of the two materials, the new-type next-generation lithium ion battery positive electrode material which achieves security and high capacity, and balances the cycle performance with the rate capability can be obtained, manufacturing method and conversion unit are simple, conditions are easy to control, industrial scale production is easy to realize, and wide application prospect can be achieved.

The invention discloses a preparation method of cobalt lithium phosphate serving as a positive material of a lithium ion battery. The method comprises the following steps: (1) preparing an amorphous nanometer cobalt phosphate-lithium phosphate mixture serving as a precursor; and (2) performing high-temperature sintering. By adopting the method, the cobalt lithium phosphate can be synthesized efficiently, and the particle size and product purity are controlled, so that the electrochemical performance is improved. The method has the advantages that the precursor is uniform in mixing, side reactions are few, the process flow is simple and amplification is easy.

A high power high voltage lithium-ion cell, which includes an anode of lithium titanate (Li₄Ti₅0₁₂), a cathode of lithium cobalt phosphate (LiCoPO₄), and a non-aqueous liquid electrolyte. Both the anode and the cathode materials are preferably of nano-sized particles.

The invention discloses a cotton-mass-shaped cobalt phosphate sphere and a preparation method thereof. The cobalt phosphate sphere is composed of cobalt phosphate nanoribbons. The preparation method comprises the steps: mixing hexamethylene tetramine, phosphate, water and alcohol, and carrying out stirring to obtain a uniform solution; then, adding a cobalt salt, and carrying out uniform stirringto obtain a mixed solution; carrying out a hydrothermal reaction on the mixed solution to obtain a precursor; and calcining the precursor to obtain the cobalt phosphate sphere. The preparation methodis low in reaction temperature, simple in preparation process, high in yield and good in repeatability, the assistance of a surfactant and a template is not needed, and the obtained product is specialin shape, not only has the high reaction activity of a nanomaterial, but also avoids the defect of poor dispersibility of the nanomaterial due to agglomeration and has a wide application prospect infields such as lithium ion batteries, supercapacitors, gas sensing and catalysis.

The invention provides an alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing LaTiO2N by a polymerization complexation method and a high-temperature ammonia gas posttreatment means; then, growing Co3(OH)2(HPO4)2 nanoneedles on the LaTiO2N in situ by a hydrothermal method to obtain a target product. The alkali cobalt phosphate nanoneedle-containing composite LTON photocatalyst prepared by the preparation method provided by the invention has special morphology, and special heterojunctions are established between the LaTiO2N and the Co3(OH)2(HPO4)2 nanoneedles, so that compared with pure LaTiO2N, the LaTiO2N photocatalyst compounded with the Co3(OH)2(HPO4)2 nanoneedles has better catalytic oxygen production performance under visible light, and improvement on the catalytic oxygen production performance of the pure LaTiO2N under visible light is achieved.

The invention relates to a preparation method and an application of a leaf-shaped cobalt phosphate nanosheet. The specific preparation steps are as follows: preparing a Co(CH3COO)2.4H2O solution, namely measuring Co(CH3COO)2.4H2O, dispersing the same in an ethylene glycol solvent, so that the Co(CH3COO)2.4H2O is fully dissolved in the solvent to prepare the Co(CH3COO)2.4H2O solution; preparing a cobalt phosphate precursor solution, namely adding a NH4H2PO4 solution to the Co(CH3COO)2.4H2O solution, and stirring uniformly to obtain the cobalt phosphate precursor solution; performing a hydrothermal reaction: placing the cobalt phosphate precursor solution in a reaction kettle, reacting for 12-15h at a constant temperature of 110-120 DEG C, performing centrifuging, washing and drying to obtain cobalt phosphate powder; and performing nitrogen atmosphere heat treatment: performing the heat treatment on the cobalt phosphate powder under a nitrogen atmosphere for 5-6h to obtain the leaf-shaped cobalt phosphate nanosheet. The preparation process provided by the invention is simple and safe, the reaction condition is mild and controllable, the cost is low, and the cycle is short. The invention discloses an application of the cobalt phosphate nanosheet in a supercapacitor, and relatively high specific capacity, high energy density and stability are shown.

The invention discloses a preparation method of a cobalt phosphate biomass carbon composite material. The invention also discloses the cobalt phosphate biomass carbon composite material and application thereof. Cobalt phosphate and biomass carbon film are combined by electrochemical deposition to obtain a cobalt phosphate/biomass carbon integrated electrode without a binding agent. The method is simple and is convenient to operate, and the material preparation cost is low. The cobalt phosphate and the biomass carbon material are initially combined and are applied to a sodium ion battery negative electrode material, and the composite material electrode is excellent in sodium storage performance and stable in structure. The prepared cobalt phosphate/biomass carbon composite material can be directly used as a negative electrode material of a sodium ion battery, the binding agent and active carbon are not needed to be added, and the cycle lifetime of the sodium ion battery can be remarkably prolonged.

The invention provides a preparation method of a nickel-rich ternary material coated with cobalt lithium phosphate, comprising the following steps: (1) coating cobalt hydroxide on the surface of the nickel-rich ternary material; (2) high-temperature treatment: uniformly mixing lithium hydroxide, phosphate and the powder obtained in the step (1), roasting in an inert atmosphere, cooling, and pulverizing to obtain the ternary material powder coated with cobalt lithium phosphate. The preparation method provided by the invention has the advantages of low sintering temperature, no damage to the performance of the nickel-rich ternary material, stability of the coated nickel-rich ternary material to the water and carbon dioxide in the air, greatly improving the processing performance of the material, improving the cycling performance of the prepared nickel-rich ternary material, and lowering the pH value and the residual lithium content.

The invention discloses a lithium cobalt phosphate-coated lithium-rich positive electrode material and a preparation method thereof, and belongs to the technical field of a lithium ion battery. The material comprises a lithium-rich material and lithium cobalt phosphate, wherein the lithium cobalt phosphate is coated on a surface of the lithium-rich material, the chemical formula of the material isLiCoPO4----Li<1.2>Mn<0.54>Ni<0.13>Co<0.13>O<2>, the structure is a layered Alpha-NaFeO2 structure, a layered space group is R<3>m, and the mass percent of the lithium cobalt phosphate accounts for 3-7%. By coating a surface of a lithium-rich positive electrode with amorphous LiCoPO4, the surface structural stability of the material is improved, meanwhile, extra discharging capacity can be provided, the initial coulombic efficiency of the coated material reaches 84.14%, the discharge specific capacity under 0.1C current reaches 305.95mAh/g, particularly, the cycle property of a sample after being coated can be greatly improved, and the capacity retention rate after circulation for 100 times under 1C rate is 88.2% much higher than 72.3% of a sample which is not coated. The preparation method is simple, the surface structure is improved (direct contact with an electrolyte is reduced, and Mn dissolution is suppressed), and the material has high discharge capacity and excellent rate performance and cycle property.

The invention discloses a photo-anode for slowing down corrosion in a photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, a preparation method and applicationthereof. The method comprises the following steps: depositing a Bi metal film on the surface of a fluorine-doped tin oxide substrate under a dark condition; and dropwise adding a solution of vanadylacetylacetonate, annealing, converting the Bi metal film into a BiVO4 substrate film, soaking the BiVO4 substrate film in an electrolyte solution containing a chelating agent, applying a constant potential to obtain an electrode film, and electrodepositing cobalt phosphate to obtain the photo-anode. According to the method, an electrode film material is synthesized through simple photo-assisted electro-deposition, rapid capture and release of holes are completed in the process of photoelectrocatalytic degradation of organic micro-pollutants in water by utilizing the cyclic process of the valence state of a cobalt element in CoPi, and self-oxidation corrosion of an internal BiVO4/Cu2O photoelectrode is inhibited. The electrode film is easy to recycle, the crystal structure of the material is not changed after degradation experiments, and the electrode film is an environment-friendly material.

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. The positive electrode material comprises a porous carbon sphere and a lithium cobalt phosphate material, wherein the lithium cobalt phosphate material is arranged in the porous carbon sphere, the peak intensity of X-ray diffraction peak of the lithium cobalt phosphate material conforms to the following: I<200>/I<131> is less than 1.5 but more than 0.8, the average grain size of the porous carbon sphere is 0.8-10 micrometers, the pore volume of the porous carbon sphere is (0.01-0.1) cm<3>/g and the carbon content of the positive electrode material is 2-10%. The lithium cobalt phosphate material obtained by employing the preparation method is uniform in particle size and excellent in electrochemical characteristics such as discharge specific capacity and cycle capacity retention ratio.

The invention provides a preparation method and application of an inverse opal structure titanium dioxide photocatalyst supported by cobalt phosphate. The main feature of the invention is that three-dimensional ordered polystyrene (PS) spheres are used as a template to prepare titanium dioxide with an inverse opal structure, and cobalt phosphate is loaded on the titanium dioxide material with an inverse opal structure by in-situ photodeposition. The sensitization of cobalt phosphate to inverse opal titanium dioxide is realized, so that the titanium dioxide can be excited to emit electrons under visible light and undergo a reduction reaction. The method adopted in the invention is simple and easy to operate, the catalyst can quickly and effectively reduce hexavalent chromium ions under the irradiation of visible light, and the valence band cycle of cobalt ions ensures the cycle stability of the catalyst.

The invention provides a microcrystalline-structure metal phosphate. The microcrystalline-structure metal phosphate can be expressed as MPO<4>.xH2O, wherein M can be a metal phosphate or a composite phosphate of more than two metals of Fe, Co, Ni, Mn and Al, x is equal to 0, 1 or 2, and the grain sizes of microcrystalline are 200-1,000 nanometers. The invention also provides a method for preparingthe microcrystalline-structure metal phosphate. The microcrystalline-structure metal phosphate has the characteristics of complete grain size distribution, consistent crystalline degree, reasonable tap density and the like, and finally, the lithium iron phosphate/lithium manganese phosphate/lithium cobalt phosphate positive electrode material is enabled to have the advantages of uniform grain distribution, reasonable tap density, relatively high energy density and the like.