91results about "Cobalt compounds" patented technology

The invention discloses a high-entropy perovskite hydroxide, a preparation method thereof and application of the high-entropy perovskite hydroxide in electro-catalysis of nitrate to synthesize ammonia, and belongs to the technical field of high-entropy perovskite hydroxides. The high-entropy perovskite hydroxide is ASn (OH) 6, and A is one or more of Zn, Mn, Co, Ni and Cu. The high-entropy perovskite hydroxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, the electrocatalyst can be applied to electrocatalysis of nitrate to synthesize ammonia, the highest NH3 Faraday efficiency is 98.16%, and the yield is 5.12 mg h <-1 > mgcat <-1 >. And a foundation is laid for developing other high-entropy perovskite compounds as electrocatalysts for electrocatalytic synthesis of nitrate.

The present application relates to the technical field of biomedical materials, and in particular to a high-entropy layered metal hydroxide material, a preparation method and application thereof, wherein the positively charged layer plate of the material structure is composed of more than four divalent metal elements and one trivalent metal element; the "cocktail" effect of the high-entropy material breaks the limitation of single function of traditional LDH in the field of wound healing, and has the functions of synergistically regulating the immune microenvironment, promoting tissue repair or resisting bacteria; the preparation method adopts a method of continuously stirring and heating under nitrogen, which replaces the production mode of a high-temperature and high-pressure reaction kettle with high cost, complicated operation and safety risks, and realizes simpler, safer, more efficient and more convenient production and preparation. The present application has important application value in the field of biomedical materials such as wound dressings.

This invention discloses a method for preparing sheet-like nano-sized cobalt hydroxide. The method includes the following steps: using cobalt nitrate as the cobalt source and sodium hydroxide solution as the precipitant, a co-precipitation reaction is carried out. The cobalt nitrate solution and sodium hydroxide solution are added together to a reaction vessel. By controlling the synthesis pH and temperature, the synthesized cobalt hydroxide slurry is washed with hot pure water, dried, and crushed using an air jet mill to obtain sheet-like nano-sized pink cobalt hydroxide with low sodium content. Specifically, the key to preparing sheet-like nano-sized cobalt hydroxide is to prevent oxidation and particle agglomeration during the synthesis process. This invention uses a low-temperature (40-60℃), low-pH (8.0-9.0) cobalt hydroxide synthesis process with a small amount of antioxidant added to prepare sheet-like micron-sized cobalt hydroxide that is not easily oxidized or agglomerated. In addition, at the low pH, the sodium content is low, making the subsequent filtration and washing steps easier to operate.

The application discloses a metal sulfide nanometer enzyme based on a eutectic solvent and a preparation method and application thereof, and belongs to the technical field of nanometer enzyme preparation. The preparation method comprises the following steps: mixing and heating a sulfur-hydrogen bond donor and a hydrogen bond acceptor according to a molar ratio of 2-3:1 to 70 DEG C-80 DEG C for 2h-2.5h to obtain a eutectic solvent; mixing and reacting the eutectic solvent and a bimetal chelate according to a weight ratio of 1:3-4 to obtain a bimetal sulfide suspension; and performing crystallization treatment on the bimetal sulfide suspension to obtain the metal sulfide nanometer enzyme. The metal sulfide nanometer enzyme prepared by the preparation method has good enzyme-like catalytic activity.

Provided in the present application are a positive electrode active material, a positive electrode sheet, a secondary battery, and an electric device. The positive electrode active material is present in a form of secondary particles formed through aggregation of primary particles. At least some of the secondary particles have pores. A particle size distribution diagram of the positive electrode active material that is measured by using a laser diffraction method is of a bimodal shape. A difference between a peak position of a second peak and a peak position of a first peak is 1 µm to 13 µm. Therefore, a battery has excellent power performance and mechanical strength.

This invention discloses a P2-type high-entropy layered oxide, its preparation method, cathode material, and sodium-ion battery, relating to the field of sodium-ion battery material technology. By employing a low-nickel, cobalt-free, or low-nickel, low-cobalt formulation, the material preparation cost is effectively reduced in terms of composition. The rational control of the content of each metal element, combined with an optimized preparation method, effectively avoids the precipitation of the second phase in the P2-type high-entropy layered oxide. This successfully and efficiently prepares a high-entropy layered oxide free of impurities and possessing a single-phase P2-type crystal structure, which is beneficial for improving the preparation efficiency and stability of the P2-type high-entropy layered oxide, achieving a stable improvement in the electrochemical performance of sodium-ion batteries. This strategy can be extended to other high-entropy layered oxide systems.

A preparation method of a medium-entropy perovskite oxygen carrier comprising: 1) preparing an aqueous solution from metallic nitrate serving as a raw material, performing a coprecipitation reaction w

This invention discloses a composite modified lithium manganese oxide cathode material, its preparation method, and its applications, belonging to the field of cathode material technology. The structural formula of the composite modified lithium manganese oxide cathode material is: LiX a O b @LiYO2 / LiMn2O4, comprising: a core composed of LiYO2 and LiMn2O4, and LiX coating at least a portion of the surface of the core. a O b The coating layer; wherein: LiMn2O4 has a porous structure, and LiYO2 fills the channels of LiMn2O4. The cathode material in this invention uses lithium manganese oxide as a matrix, with LiYO2 filling the channels of the matrix, and LiX coated on the surface of the matrix. a O b Filling the pores with LiYO2 can reduce the Jahn-Teller effect of lithium manganese oxide without affecting the specific capacity of the cathode material. Moreover, LiYO2 can accelerate the lithium-ion diffusion rate, thereby improving the rate performance of the material.

The application belongs to the technical field of cobaltosic oxide material preparation, and particularly relates to aluminum-doped cobaltosic oxide, a preparation method and application thereof. The preparation method of the aluminum-doped cobaltosic oxide provided by the application comprises the following steps: 1) mixing cobalt salt, aluminum salt and water to obtain a cobalt salt and aluminum salt mixed solution; 2) mixing cetyltrimethylammonium bromide, ammonia water and water, then adding the cobalt salt and aluminum salt mixed solution obtained in step 1) and a hydroxide solution to react at a reaction temperature of 69-71 DEG C, and calcining after the reaction is completed to obtain the aluminum-doped cobaltosic oxide. The cobaltosic oxide synthesized by the preparation method has large granularity, multiple pore structures, high tap density, good primary crystal form and uniform aluminum doping.

A positive electrode active material for lithium-ion secondary batteries that offers high capacity and excellent charge-discharge cycle characteristics. provide. [Solution] A device containing lithium, cobalt, magnesium, oxygen, and fluorine, C Rietveld analysis was performed on the patterns obtained by powder X-ray diffraction using uKα1 rays. When this occurs, the crystal structure has a space group of R-3m, and the lattice constant of the a-axis is 2.814. Greater than ×10⁻¹⁰ m and less than 2.817 × 10⁻¹⁰ m, and c-axis The lattice constant is greater than 14.05 × 10⁻¹⁰ m, which is 14.07 × 10⁻¹⁰. When m is smaller and analyzed by X-ray photoelectron spectroscopy, the magnesium concentration when the cobalt concentration is set to 1 is... The positive electrode active material has a relative um concentration of 1.6 to 6.0.

To provide a positive electrode active material with high capacity and good cycle characteristics. [Solution] The positive electrode active material is designed to show little change in its crystal structure between the charged and discharged states. For example, in the discharged state, it has a layered rock salt-type crystalline structure, and when charged with a high voltage of about 4.6V... In its state, the positive electrode active material having a pseudo-spinel type crystal structure is more responsive than known positive electrode active materials. The crystal structure and volume change little before and after discharge. When analyzed by XRD, 2θ = 19.30 ± 0.20° and 2θ = 45.55 ± 0 A diffraction peak occurs at 0.10°.

A method is provided for inputting thermal energy into a fluid medium in a manufacturing method using at least one rotating device, comprising a casing having at least one inlet and at least one outlet, a rotor having at least one row of rotor blades arranged around a rotor hub attached to a rotor shaft, and a stator configured as an assembly of fixed vanes positioned at least upstream of the at least one row of rotor blades. The method imparts an amount of thermal energy to the flow of the fluid medium guided along a channel created inside the casing between the inlet and the outlet by a series of energy conversions that occur as the flow of the fluid medium passes through the fixed vanes and at least one row of rotor blades, respectively. The method comprises incorporating the at least one rotating device into a manufacturing facility configured to perform a material manufacturing method, such as producing titanium oxide, mineral wool, gypsum, wood pulp and paper, cathodes and anodes, or rapidly dried chemicals at a temperature essentially of about 500°C or above, and conducting an input amount of energy to the at least one rotating device incorporated into the heat consumption method facility, wherein the input energy includes electrical energy. Further provides rotating devices and related uses.

The present disclosure relates to a solid-state battery including: an exterior portion and an insulating portion, in which at least one of the exterior portion and the insulating portion includes an oxide ceramic containing: Li; Mg; one or more elements MI selected from the group consisting of Group 4 and Group 5 elements; and one or more elements MII selected from the group consisting of transition metal elements.

A positive electrode active material for lithium-ion secondary batteries that offers high capacity and excellent charge-discharge cycle characteristics. provide. [Solution] A device containing lithium, cobalt, magnesium, oxygen, and fluorine, C Rietveld analysis was performed on the patterns obtained by powder X-ray diffraction using uKα1 rays. When this occurs, the crystal structure has a space group of R-3m, and the lattice constant of the a-axis is 2.814. Greater than ×10⁻¹⁰ m and less than 2.817 × 10⁻¹⁰ m, and c-axis The lattice constant is greater than 14.05 × 10⁻¹⁰ m, which is 14.07 × 10⁻¹⁰. When m is smaller and analyzed by X-ray photoelectron spectroscopy, the magnesium concentration when the cobalt concentration is set to 1 is... The positive electrode active material has a relative um concentration of 1.6 to 6.0.

The application is a preparation method of a bimetallic sulfide heterojunction material. The method comprises the following steps: (1) taking urea and cobalt chloride hexahydrate and dissolving them in deionized water to obtain a precursor material by heating reaction; then the precursor material is dissolved in deionized water with sodium sulfide nonahydrate to obtain Co9S8 powder by heating reaction; (2) adding Co9S8 into a mixed solution of an organic solvent and deionized water, then adding metal oxyacid salt and sulfur source in sequence, and obtaining the bimetallic sulfide heterojunction material by heating reaction. The lithium-sulfur battery assembled by the modified positive electrode of the bimetallic sulfide heterojunction material has an initial discharge specific capacity as high as 1426 mA h g ‑1 , and the average capacity attenuation of each cycle is only 0.008% after 2000 cycles under the condition of 4 C.

The application belongs to the technical field of solid oxide fuel cell anode catalyst, and particularly relates to a preparation of a multi-doped layered perovskite anode and application thereof in ammonia solid oxide fuel cells. x Ba 1–x Mn 1–y TM y O 3–δ (0.4<=x<=0.6, 0<=y<=0.3, TM=Co, Fe, Cu), the precursor is phase changed under a reducing atmosphere to form a PrBaMn2O 5+δ layered perovskite with rich oxygen vacancies, and the doped transition metal is precipitated in the form of an alloy and anchored on the surface of the layered perovskite. The anode catalyst has a simple synthesis method, low cost, rich and flexible adjustable element composition. The obtained anode catalyst is made into a slurry and then assembled into a solid oxide fuel cell single cell sheet. The solid oxide fuel cell prepared by the application has good power output, electrical conductivity and stability at medium and high temperatures.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

The application relates to the technical field of a preparation technique of double perovskite oxide materials, in particular to a double perovskite oxide and a microwave preparation method thereof. High-purity oxides and carbonate powders are weighed according to a stoichiometric ratio, anhydrous ethanol is added to carry out ball milling, the slurry obtained after the ball milling is dried, and then screening and microwave sintering are carried out, so that the double perovskite oxide is finally obtained. The double perovskite oxide is prepared by using a microwave pyrolysis method, only needs to be kept warm for about 30 minutes, and the preparation time is greatly shortened, and the preparation process is optimized.

This invention relates to the field of cobalt hydroxide purification, specifically to a method for removing uranium from uranium-rich cobalt hydroxide: Uranium-rich cobalt hydroxide raw material is prepared by adding acid to form a cobalt-containing solution; ammonia solution, hexamethylenetetramine solution, and phosphoric acid solution are added sequentially to the cobalt-containing solution for uranium removal in series, yielding a uranium-removed solution. After solid-liquid separation, uranium-rich filter residue and a uranium-removed cobalt solution are obtained. This invention targets crude cobalt hydroxide products enriched with uranium. By using a series uranium removal method and selecting a combination of three precipitants, the co-precipitation of valuable metal cobalt and uranium is avoided, significantly reducing the loss of cobalt. Simultaneously, this method greatly improves the separation efficiency of uranium, reaching approximately 98%; the loss of cobalt metal is as low as 0.9%.

A positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. A positive electrode active material with high charge and discharge capacity is provided. A projection is provided on the surface of the positive electrode active material. The projection preferably contains zirconium and yttrium and is a rectangular solid. The projection preferably has a crystal structure that is tetragonal, cubic, or a mixture of two phases, tetragonal and cubic. In the positive electrode active material, the transition metal is one or two or more selected from cobalt, nickel, and manganese, and the additive elements are at least two or more selected from magnesium, fluorine, aluminum, zirconium, and yttrium.

Electrodes for batteries, active stacks for batteries, batteries and methods of fabrication are described where the electrode has an LiCoO2 (LCO) electrode layer with a (110), (101), (104), or (003) crystallographic orientation or combinations thereof.

A ceramic composite material includes Barium titanate (BaTiO3) and CoFe1.98Nb0.02O4. The BaTiO3 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO3 and the CoFe1.98Nb0.02O4. The CoFe1.98Nb0.02O4 is present in an amount of 1 to 99 percent by weight based on the total weight of the BaTiO3 and the CoFe1.98Nb0.02O4. These composite products may be suitable for high-frequency electromagnetic device applications.

Device (100) for producing an active material composite powder (30) by coating surfaces of active material particles or composite particles obtained by coating the surfaces of the active material particles (31) with an oxide-based solid electrolyte (32) with a sulfide-based solid electrolyte (33), wherein the device (100) comprises: a storage body (11) which has a cylindrical inner wall surface (12), and a rotating body (13) which is arranged in an interior space which is surrounded by the inner wall surface (12) of the storage body (11), which has a rotating shaft (14) which is aligned with a central axis (X) of the interior space, and which has a plurality of leaves (15), wherein an end part (19) of each sheet (15) has on a front side in a direction of rotation of the rotating body (13) such that a thickness (24) of the sheet (15) gradually tapers towards a sheet end side, characterized by the fact that the end part (19) of each sheet (15) on a back side in the direction of rotation of the rotating body (13) has such a curved end surface (21) that the curved end surface (21) faces the inner wall surface (12) of the storage body (11) and is generally parallel to the inner wall surface (12) of the storage body (11), and a width (23) of the curved end surface (21) of the end part (19) of each sheet (15) lies in a range of 1 / 3 to 0.7 relative to the thickness (24) of the sheet (15).

The application provides a pretreatment method for optimizing sintering effect of lithium cobalt oxide and application thereof. The pretreatment method comprises the following steps: placing lithium cobalt oxide sintering mixture to be sintered into a sintering container, pressing and flattening, obtaining a total block to be sintered, and then cutting, entering the next sintering process. Before sintering of the lithium cobalt oxide, the method of pressing and flattening the sintering mixture and then cutting is adopted, so that the reaction of each part of the sintering material is more balanced, the generation of agglomerated particles and twin crystals of the lithium cobalt oxide is reduced, and thus the single-crystal synthesis of the large-particle lithium cobalt oxide is more sufficient.

The application provides a method for calculating the specific surface area of nanometer cobalt hydroxide, and belongs to the technical field of lithium ion battery material preparation, and solves the problem of difficult accurate adjustment of the specific surface area of nanometer cobalt hydroxide, wherein the application uses cobalt sulfate as raw material to prepare solution A and solution B; the prepared solution is subjected to nanometer cobalt hydroxide synthesis reaction; then the synthesized slurry is aged, washed, dried and airflow broken to obtain nanometer cobalt hydroxide product; the concentration of sodium hydroxide, the synthesis temperature range, the specific surface area of the prepared nanometer cobalt hydroxide, the negative linear relationship and the numerical relationship between the concentration of the sodium hydroxide solution, the synthesis temperature and the specific surface area of the nanometer cobalt hydroxide are set. By adjusting the concentration of the sodium hydroxide solution and the synthesis temperature during the wet synthesis of nanometer cobalt hydroxide, the specific surface area of the nanometer cobalt hydroxide can be accurately adjusted within a range, and the control precision reaches the theoretical requirement.

A positive electrode active material for lithium-ion secondary batteries that offers high capacity and excellent charge-discharge cycle characteristics. provide. [Solution] The positive electrode active material is designed to show little change in its crystal structure between the charging and discharging states. For example, in the discharged state, it has a layered rock salt-type crystalline structure, and when charged with a high voltage of about 4.6V... In its state, the positive electrode active material having a pseudo-spinel type crystal structure is more responsive than known positive electrode active materials. There is little change in crystal structure and volume before and after discharge. In the charged state, it is a pseudo-spinel type crystal. To produce a cathode active material with a structure, lithium cobalt oxide is synthesized, and then fluorine is added. Add lithium fluoride and magnesium fluoride and mix, then heat at the appropriate temperature and time. It is preferable.

This invention discloses a Co-doped α-MnO2 material, its preparation method, and its application in anode materials, comprising the following steps: Step 1: Dissolving potassium permanganate (KMnO4) and cobalt nitrate hexahydrate (Co(NO3)2·6H2O) in deionized water and stirring to obtain a homogeneous precursor solution; Step 2: Adding hydrochloric acid solution dropwise to the precursor solution and stirring continuously to ensure thorough mixing; Step 3: Transferring the mixed solution to a high-pressure reactor lined with polytetrafluoroethylene for hydrothermal reaction; Step 4: After the reaction, centrifuging, washing, and drying the product to obtain the Co-doped α-MnO2 material. This invention exhibits significantly improved discharge specific capacity and excellent rate performance at low current densities.

This invention belongs to the field of battery materials and discloses a lithium-rich manganese-based precursor material, its preparation method, and its applications. The molecular formula of the lithium-rich manganese-based precursor material is Mn. 1‑m‑n N n (OH)₂, wherein N is one or more of Ni, Co, Fe, Al, and Zn, m ranges from 0.1 to 0.4, and n ranges from 0 to 0.4; the lithium-rich manganese-based precursor material exhibits a mixed morphology of plate-like particles and spherical particles, wherein the plate-like particles are polygonal, and the spherical particles are distributed among the plate-like particles. The cathode material obtained after lithiation of the lithium-rich manganese-based precursor material at high temperature has good compaction and tap density, and its application in batteries can improve the electrochemical performance of the batteries.

To provide an oxide particle that has controlled color characteristics and can be stably supplied with a low energy and a low resource consumption, and a method for producing the oxide particle.SOLUTION: Provided is a silicon compound-coated oxide particle in which at least part of a surface of an oxide particle thereof is coated with a silicon compound. An oxide which constitutes the oxide particle is an iron oxide. The silicon compound can change color characteristics of the oxide particle by coating at least part of the surface of the oxide particle. A M-OH bond / M-O bond ratio of the oxide particle is 1% or more and 30% or less. An average reflectance of the oxide particle to a light beam in the wavelength of 780 nm to 2,500 nm is 50% or more.SELECTED DRAWING: Figure 1

The application belongs to the field of electrochemical catalysts, and particularly relates to a semiconductor phase MoS2 transition metal-based composite catalyst, a preparation method thereof and application of the semiconductor phase MoS2 transition metal-based composite catalyst in electrocatalytic synthesis of ammonia from N2O. The preparation method of the semiconductor phase MoS2 transition metal-based composite catalyst comprises the following steps: (1) dissolving molybdate and a sulfur-containing organic compound in water, then adding a soluble salt of a transition metal to form a uniform precursor solution by stirring; adding a phosphorization source into the precursor solution to uniformly disperse to obtain a mixed solution; (2) reacting the mixed solution in step (1) at 160-200 DEG C for 20-28 h, cooling to room temperature after the reaction is completed, and washing and drying the obtained product to obtain the semiconductor phase MoS2 transition metal-based composite catalyst. The application successfully constructs a close heterojunction of transition metal phosphide / sulfide and MoS2 in a MoS2-based composite structure through a one-pot hydrothermal-phosphorization synergistic preparation method.