37results about How to "Uniform particle size dispersion" patented technology

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high tap density lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. The positive electrode material is prepared by mixing small particles of lithium manganese iron phosphate with a particle size of 0.3-0.8um and large particles of lithium manganese iron phosphate with a particle size of 3-5um in a mass ratio of 1-9:9-1, and the preparation method includes : (1) Preparation of dense ferromanganese phosphate; (2) Preparation of large and small particles of lithium iron manganese phosphate slurry; (3) Preparation of lithium iron manganese phosphate precursor powder; (4) Preparation of finished product of lithium iron manganese phosphate ; The obtained material is applied to the positive electrode material of lithium battery. The lithium manganese iron phosphate prepared by the invention has high tap density, high electrical capacity, good rate performance, high charge and discharge efficiency, large gram capacity, simple preparation process and easy control, low energy consumption and raw material cost, high production efficiency, It can be applied to large-scale industrial production.

The invention provides a chitosan modified cationic starch emulsifier and a method for preparing AKD emulsion thereof. The chitosan modified cationic starch emulsifier is obtained by reacting chitosan, cationic starch and crosslinking agent glutaraldehyde. It contains cationic starch, chitosan grafts and unreacted chitosan and cationic starch. Compared with cationic starch emulsifier, the sizing effect of chitosan-modified cationic starch emulsified by AKD is more significant. The KAD emulsion prepared by using this emulsifier has the advantages of good stability, small dairy particle size, environmental protection, and no organic chlorine, and can be applied to the preparation of food packaging paper.

The invention relates to a preparation method of a thin film material, and more specifically relates to a preparation method of a La0.7Ca0.25Sr0.05MnO3 ferromagnetic thin film. The preparation method comprises following steps: 1, lanthanum nitrate is added into a mixed solution of glacial acetic acid and ethylene glycol monomethyl ether so as to obtain a solution A; 2, a mixture of calcium acetate and strontium nitrate is added into the mixed solution of glacial acetic acid and ethylene glycol monomethyl ether so as to obtain a solution B; 3, manganese acetate is added into the solution B so as to obtain a solution C; 4, the solution A is mixed with the solution C, and 1 to 10ml of acetic acid is added so as to obtain a La0.7Ca0.25Sr0.05MnO3 solution; 5, a substrate is subjected to ultrasonic processing in acetone and absolute ethyl alcohol successively; 6, the La0.7Ca0.25Sr0.05MnO3 solution is added onto the processed substrate dropwise for spin coating so as to obtain a thin film D; 7, the thin film D is subjected to presintering so as to obtain a thin film E; 8, the thin film E is delivered into a rapid heat treatment furnace for roasting, and is cooled with the rapid heat treatment furnace to room temperature so as to obtain the La0.7Ca0.25Sr0.05MnO3 ferromagnetic thin film. The preparation method is capable of solving problems of existing technology used for preparing the La0.7Ca0.25Sr0.05MnO3 (LCSMO) ferromagnetic thin film that performance is poor, purity is low, density is low, and sintering temperature is too high in preparation processes. The LCSMO ferromagnetic thin film with uniform film thickness and excellent magnetocaloric effects is prepared via modified sol-gel method.

The invention discloses multi-pipe material aerial pushing equipment. The multi-pipe material aerial pushing equipment comprises a feed funnel; a discharge port of the feed funnel communicates a first feed pipe; a rough screen is arranged in the first feed pipe; a second feed pipe communicates above a discharge end of the first feed pipe; a heating device is arranged in the second feed pipe; a crusher communicates above a discharge end of the second feeding pipe, and includes a machine body; a feed port of the machine body communicates the discharge end of the second feed pipe; a rotary crushing cutter at least including two blades is arranged in the machine body; multiple projections are arranged on the surfaces of the blades of the crushing cutter; and a discharge pipe communicates below the machine body. The multi-pipe material aerial pushing equipment enables the particle sizes of materials, finally participated in the reaction, to be smaller through primary screening, heating dehumidification and crushing of powder-shaped materials, and is more uniform in dispersion of the particle sizes.

The invention provides a positive electrode material of a lithium-sulfur battery and a preparation method thereof, and aims at improving the electronic and electric conductivity so as to improve the capacity of a positive electrode of the lithium-sulfur battery and prolong the circle life of the lithium-sulfur battery, and solving the problem that the capacity of the positive electrode of the lithium-sulfur battery rapidly decreases, resulting in short circle life of the battery. The positive electrode material is characterized in that a BaTiO3 material is introduced, so that the electronic and electric conductivity of the positive electrode material can be improved, and the capacity and the circulating performance of the electrode can be effectively improved; the introduced porous carbonmaterial is high in specific area and high pore distribution performance, and a large number of elemental sulfur can be stored, so that high sulfur content in a composition is ensured; sulfur is uniformly distributed in porous carbon, so that the utilization rate of active substances of the sulfur can be increased; the pore channel structure of the porous carbon relieves the dissolution loss of anintermediate product which is polysulfide lithium, thus the shuttling effect is reduced; the service life of the battery is prolonged, and the coulombic efficiency is improved. The preparation methodis simple in processes, simple in equipment, short in manufacturing period, easy to operate, low in energy consumption, environmentally friendly, and easy for industrial production.

The invention discloses a multipurpose polylysine fluorescence self-assembly nano microsphere carrier and a preparation method and application thereof. By nano self-assembly technique, rhodamine marked polylysine fluorescence self-assembly nano microspheres can be prepared, azide group side chains with disulfide bonds can be modified, and by use of a click chemistry method, an alkynyl modified drug is connected with the fluorescent nano microspheres. The polylysine self-assembly nano microspheres linked with the drug can be used for tracing imaging analysis of the modified drug in animal and cell level. At the same time, the polylysine self-assembly nano microspheres can also be used to capture binding proteins of the modified drug, can release target binding proteins and associated proteins by cleavage of the disulfide bonds, and can be used for the study of drug effect targets. The invention provides a simple and fast tool and method for the study of the drug effect targets, and the method integrates drug tracing, target positioning and target protein capture and separation functions, is simple and practical, and has good application prospect in the study of drug action mechanisms and target discovery.