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432results about How to "Small particle size" patented technology

Nickel-manganese composite hydroxide particles, method for producing same, positive electrode active material for nonaqueous electrolyte secondary batteries, method for producing said positive electrode active material, and nonaqueous electrolyte secondary battery

ActiveCN102884659ASmall particle sizeImprove particle size uniformityFinal product manufactureCylindrical casing cells/batteryComplex ionsComposite oxide
Provided are nickel manganese composite hydroxide particles that are a precursor for forming cathode active material comprising lithium nickel manganese composite oxide having hollow structure of particles having a small and uniform particle size for obtaining a non-aqueous electrolyte secondary battery having high capacity, high output and good cyclability. When obtaining the nickel manganese composite hydroxide particles from a crystallization reaction, an aqueous solution for nucleation, which includes at least a metallic compound that contains nickel and a metallic compound that contains manganese, and does not include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, is controlled so that the temperature of the solution is 60 DEG C or greater, and so that the pH value that is measured at a standard solution temperature of 25 DEG C is 11.5 to 13.5, and after nucleation is performed, an aqueous solution for particle growth, which includes the nuclei that were formed in the nucleation step and does not substantially include a complex ion formation agent that forms complex ions with nickel, manganese and cobalt, is controlled so that the temperature of the solution is 60 DEG C or greater, and so that the pH value that is measured at a standard solution temperature of 25 DEG C is 9.5 to 11.5, and is less than the pH value in the nucleation step.
Owner:SUMITOMO METAL MINING CO LTD

Preparation method of cerium oxide nanoballs

The invention relates to a preparation method of cerium oxide nanoballs, and belongs to the technical field of the preparation processes of the inorganic nanomaterials. The key points of the method of the invention include: stirring and mixing cerium salt and a certain amount of surfactant at room temperature, dissolving the mixture in a mixed solution of water and an organic solvent and ultrasonically processing the mixture for 5 to 10 minutes, wherein the cerium salt is optimally cerium nitrate; the surfactant is most preferably polyvinylpyrrolidone; and the belonged organic solvent is most preferably diglycol; then transferring the mixed solution into a high pressure reaction kettle to perform a solvothermal reaction; heating the mixed solution to perform reaction for 24 to 28 hours at the temperature of 100 to 200 DEG C so as to obtain the cerium oxide nanoball sol; evaporating the sol at the temperature of 1500 o 180 DEG C to dryness; and forging the obtained powder for 1 to 4 hours at the temperature of 400 to 600 DEG C; and finally obtaining the cerium oxide nanoballs in the shape of yellow solid powder. The nanoballs have a particle size ranging from 30 to 160nm and high performance and can be applied in fields of ultraviolet light shielding, mechanical polishing and automobile exhaust catalyzation and the like.
Owner:SHANGHAI UNIV

Copper based catalyst used for hydrogenating carbon dioxide to synthesize methanol, and preparation method and application thereof

The invention discloses a copper based catalyst used for hydrogenating carbon dioxide to synthesize methanol, and a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: 1, processing a zinc salt, an aluminum salt, a zirconium salt and a stabilizer to prepare a first solution, or processing the zinc salt, the aluminum salt and the zirconium salt to prepare a second solution; 2, processing carbonate and hydroxide to prepare a third solution; 3, processing a copper salt to prepare a fourth solution; 4, processing the first solution and the third solution to form a first precipitation solution, or processing the second solution and the third solution to form a second precipitation solution; 5, adding the fourth solution to the first precipitation solution to form a third precipitation solution or adding the fourth solution to the second precipitation solution to form a fourth precipitation solution, ageing after Cu in the precipitation solution precipitates, and washing; and 6, drying, and calcining. The catalyst contains 30-50% of Cu, 20-40% of Zn, 10-20% of Al, and 5-20% of Zr. The catalyst is used for a reaction for hydrogenating carbon dioxide to synthesize methanol.
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI

Lithium ion battery negative electrode sheet containing electric-conduction coating, and preparation method thereof

The invention relates to the field of lithium batteries, and discloses a lithium ion battery negative electrode sheet containing an electric-conduction coating, and a preparation method thereof. The negative electrode sheet comprises a copper foil current collector, an electric-conduction coating and a negative electrode active material layer, wherein the negative electrode active material layer is formed by curing a negative electrode slurry, the negative electrode slurry comprises 93-95 parts of graphite, 1.5-2.5 parts of electric-conduction carbon black SP, 1-2 parts of sodium carboxymethylcellulose, 2-3 parts of styrene-butadiene rubber, and 130-150 parts of deionized water, the electric-conduction coating is formed by curing an electric-conduction slurry, and the electric-conductionslurry comprises 10-95 parts of a composite carbon source, 5-50 parts of a binder, 5-40 parts of a dispersing agent, and 450-550 parts of an organic solvent. According to the present invention, the current collector is coated with the special electric-conduction slurry layer, such that the specific surface area is large, the impedance is low, the bonding force of the electrode sheet can be substantially improved, the electric conductivity can be enhanced, the adding amounts of the binder and the electric-conduction agent can be reduced, and the energy density of the battery can be improved.
Owner:WANXIANG 123 CO LTD

Method for preparing palladium and/or antimony-doping tin oxide nano-powder

The invention discloses a method for preparing palladium and/or antimony-doping tin oxide nano-powder. The method mainly comprises the following steps of: mixing raw materials according to the molar doping ratio of Pd<2+> and/or Sb<3+> to Sn<2+> of 0.5 to 3.5 and dropwise adding at least one of the solution of PdCl2 and the suspension of SbCl3 into the solution of tin salt with stirring to form mixed solution, wherein the raw materials comprise 0.2 to 1 mol/L solution of tin salt, 0.1 to 0.5 mol/L solution of palladium chloride (PbCl2), 0.1 to 0.5 mol/L suspension of antimony chloride (SbCl3)and 0.4 to 1 mol/L solution of alkali source; adding the solution of alkali source dropwise into the mixed solution with stirring until the pH value is between 9 and 13; stirring the solution to formprecursor suspension with a large amount of precipitate; transferring the precursor suspension to a high-pressure reactor to perform reaction for 12 to 36 hours at the temperature of between 100 and 200 DEG C and naturally cooling to room temperature to obtain a hydrothermal product; washing the hydrothermal product for multiple times by using deionized water and ethanol and detecting the productby using silver nitrate until the Cl<-> is removed completely; and drying at the temperature of between 70 and 100 DEG C to obtain the palladium and/or antimony-doping tin oxide nano-powder. The method has the advantages of simple process, environmental friendliness and suitability for industrialized production.
Owner:NINGBO UNIV

Method for preparing pure acrylate copolymer coating emulsion for building external wall elastic coating

The invention discloses a method for preparing a pure acrylate copolymer coating emulsion for a building external wall elastic coating, including a preparation method of a seed emulsion, a pure acrylate type elastic emulsion prepared from the seed emulsion and a preparation method thereof, as well as an elastic coating prepared from the elastic emulsion added with auxiliaries, a filler and the like, wherein the ratio (by wt) of comonomers St:MMA:BMA:BA of the copolymer of the seed emulsion is (32-42):(18-27):(18-27):(12-22); the hansch constant of the polymer of the seed emulsion is 3.00-3.81 pKa; and the elastic emulsion is obtained through seed polymerization of a monomer mixture which is composed of acrylic acid (AA), acrylamide (AM), butyl acrylate (BA), methyl methacrylate (MMA) and n-butyl methacrylate (BMA) in a monomer ratio (wt) of (0.8-5):(0.8-5):(25-45):(7-33):(7-33). As the elastic coating prepared from the pure acrylate type elastic emulsion prepared by the method provided by the invention is obviously improved in properties such as stain resistance, weather fastness, low-temperature elasticity, adhesiveness, water tolerance and the like, the elastic coating can be used as an external wall decorative coating high in requirement for durability and thus can be widely applied to the field of building coating.
Owner:HENGSHUI XINGUANG CHEM

Method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse

The invention discloses a method for generating biogas through intensified hydrolysis and anaerobic digestion of municipal domestic organic refuse. The method comprises the following steps of: reducing the gain diameter of the municipal domestic organic refuse to below 1 cm; placing the pulverized raw materials into a raw material regulating pool and adding water or digestive liquid into the pool to adjust and control the solid concentration of the raw materials to be below 15 percent; conveying the raw materials with adjusted solid concentration to a heating hydrolyzing pond to preheat the raw materials; pumping the heated raw materials into a medium-temperature anaerobic digestion reactor to perform medium-temperature anaerobic digestion; after the medium-temperature anaerobic digestion is finished, conveying the raw materials to a superhigh temperature intensified hydrolysis reactor; after the intensified hydrolysis, conveying the raw materials to a high-temperature anaerobic digestion reactor; after the high-temperature anaerobic digestion is finished, conveying the raw materials to a sedimentation tank, wherein the temperature of the sedimentation tank is natural temperature; and after the sedimentation, conveying the digestive liquid on the upper part in the tank to a digestive liquid storage pool. The process operation and management are simple; the organic matter removing rate and gas generating rate of the raw materials are high; and pathogenic bacteria in the refuse can be removed completely.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

Method for manufacturing spinelle lithium titanate for lithium ionic cell cathode material

InactiveCN101391806AImprove high current charge and discharge performanceSmall particle sizeCell electrodesLithium compoundsLithium carbonateSolid-state
The invention provides a method for preparing spinel lithium titanate used for the negative electrode materials of lithium ion batteries, which comprises the following steps of: mixing compounds of metatitanic acid and lithium according to an atomic ratio of lithium to titanium between 0.8 and 0.88; adding into carbon or powder former body of the carbon; carrying out an even mixing for 5 to 72 hours in a medium and then drying the mixture; carrying out treatment for 2 to 20 hours under the temperature between 200 and 500 DEG C; then synthesizing for 2 to 72 hours under the temperature between 600 and 900 DEG C, to acquire spinel-structure lithium titanate for the negative electrode materials of the lithium ion batteries. Adopting the cheap metatitanic acid as the raw materials and adding into the carbon or powder former body of the carbons, the method for preparing spinel lithium titanate for the negative electrode materials of the lithium ion batteries realizes the synthesis of spinel-structure lithium titanate with grains diameter less than 500 nanometers under lower temperatures and greatly improves the rate capacity, while the traditional high-temperature solid state method, with a sintering temperature generally between 800 and 100 DEG centigrade, only produces larger lithium carbonate particles at micron levels. With simple technique and strong operability, the method for preparing spinel lithium titanate for the negative electrode materials of the lithium ion batteries is easy to realize large-scale production.
Owner:GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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