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Preparation method of composite oxide AB2O4 for lithium ion secondary battery cathode material

InactiveCN104022261AParticles are small and uniformLarge specific surface areaCell electrodesSecondary cellsFreeze-dryingCombined method

The invention provides a preparation method of a composite oxide AB2O4 (A equals to Mn, Co, Ni, Cu, Zn; B equals to Mn, Fe, Co, Ni, Zn; and A is not equal to B) for lithium ion secondary battery cathode material. The invention uses A, B metal salts and an organic chelating agent as raw materials and employs a sol gel and freeze-drying combined method for synthesis of AB2O4. The AB2O4 synthesized by the method has small particle size and uniform particle size, forms a three-dimensional network structure, and increases the specific surface area of the material, so as to improve the electrochemical performance of the cathode material; and the preparation process is simple and low in cost. The composite oxide AB2O4 is considered to be a promising material.

Preparation method of composite oxide AB2O4 for lithium ion secondary battery cathode material

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Owner:SHANGHAI NAT ENG RES CENT FORNANOTECH

Industrial preparation method for lithium iron phosphate

InactiveCN101955175AEvenly dispersedParticles are small and uniformCell electrodesPhosphorus compoundsSource materialNew energy

The invention belongs to an energy material, and particularly relates to a method for preparing a lithium iron phosphate anode material suitable to be used by a power type lithium ion battery and the like by using PVP (polyvinylpyrrolidone) as a dispersant and a carbon source at the same time in an aqueous solution. The method comprises the following steps of: weighing a lithium source compound, an iron source compound and a phosphorus source compound in a weight ratio, adding the compounds into water, adding a proper amount of PVP into the mixture, grinding the mixture for certain time, drying the mixture, transferring the obtained precursor into an atmosphere protection furnace, treating the precursor for certain time at a high temperature under inert atmosphere, and cooling the product to obtain the lithium iron phosphate. By observing, one-time particles are uniform and fine, and the first discharge capacity is 157.6mAh / g. The method has the advantages of low energy consumption, high grinding efficiency and environment-friendly and pollution-free production process, and is an excellent method for synthesizing a green new energy source material. The prepared material has the advantages of uniform particle size distribution, good circulating stability and prominent magnification performance, and is a battery anode material suitable for high-capacity energy storage equipment such as substations and the like and large-sized mobile equipment such as electric automobiles and the like.

Industrial preparation method for lithium iron phosphate

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Owner:BEIJING CENT PRESS UNION TECH

Integrated utilization method for phosphorus chemical industry byproduct fluorosilicic acid

InactiveCN101214960AHigh shear forcePromote generationSilicaAmmonium halidesSal ammoniacFiltration

The invention discloses a comprehensive utilization method of hydrofluosilicic acid which is by-product of phosphorus chemical engineering. The method is that hydrofluosilicic acid solution with concentration of 18%-35% is added to a container with intense agitation and rapid heat withdrawing under -5 DEG C to 30 DEG C, the agitation is started with an agitation speed of 500rmp-10000rmp, simultaneously ammonia with concentration of 13%-37% is added, or ammonia gas is added. Silica gel is obtained by filtration, after the silica gel is washed and dried, finished product of white carbon black with surface area of 160-350m2 / g is obtained. The filtering liquid is ammonium fluoride solution with concentration larger than 20%, and the ammonification recovery ratio can reach more than 98%. The invention is simple in technique, the hydrofluosilicic acid is made good use of, and the produced white carbon black has good quality.

Integrated utilization method for phosphorus chemical industry byproduct fluorosilicic acid

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Owner:YUNNAN CHEM RES INST

High-capacity lithium-enriched positive electrode material and preparation method thereof

ActiveCN104134797AHigh crystallinityUniform and controllable particle sizeCell electrodesSecondary cellsLithiumCalcination

The invention belongs to the field of electrochemistry and particularly relates to a high-capacity lithium-enriched positive electrode material and a reparation method thereof. The molecular formula of the high-capacity lithium-enriched positive electrode material is Li[Li<x-beta>Na<beta>Mn<1-y-z-alpha>Co<y>Ni<z>Y<alpha>]O2, wherein x is more than or equal to 0 and less than or equal to 0.6, y is more than 0 and less than or equal to 0.4, z is more than 0 and less than or equal to 0.4, alpha is more than or equal to 0 and less than or equal to 0.1 and beta is more than or equal to 0 and less than or equal to 0.2; the result of (1-y-z-alpha) is more than 0 and the result of (x-beta) is more than 0. The lithium-enriched positive electrode material containing Na and Y has the characteristics of low first-time irreversible capacity, large electrochemical capacity, high cycling stability, excellent rate performance and the like. The preparation method has the advantages that a preparation process is simple, raw materials are cheap and easily available, the cost is low, the high-temperature calcination time is very short, the repeatability is good and the industrialization is easy to realize.

High-capacity lithium-enriched positive electrode material and preparation method thereof

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Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY

Single-step hydrothermal micro-emulsion method for preparing iron-doped nano titanium dioxide powder

InactiveCN103537286AAvoid stabilityMild preparation conditionsMetal/metal-oxides/metal-hydroxide catalystsAlkylphenolOil phase

The invention relates to a single-step hydrothermal micro-emulsion method for preparing iron-doped nano titanium dioxide powder. The single-step hydrothermal micro-emulsion method specifically comprises the following steps of constituting water-in-oil W / O type micro-emulsion by using alkylphenol ethoxylates (OP-10) as a surfactant, using n-butyl alcohol (C4H9OH) as a cosurfactant, using cyclohexane (C6H12) as an oil phase, using butyl titanate (Ti(OC4H9)4) as a titanium source and using hydrochloric acid (HCl) liquor of ferric chloride (FeCl3.6H2O) as a water phase; uniformly stirring, and transferring into a lined polytetrafluoroethylene reaction kettle for keeping heat for 1 hour-5 hours at a constant temperature of 120 DEG C-160 DEG C, naturally cooling to the room temperature; and washing, separating and drying to prepare the iron-doped nano titanium dioxide powder. According to the single-step hydrothermal micro-emulsion method disclosed by the invention, the iron-doped titanium dioxide is obtained by directly reacting in a low-temperature liquid phase, the preparation process is simple, and the prepared iron-doped nano TiO2 powder is controllable in dimension, uniform in size and provided with average diameter of 10 nm-25 nm; moreover, the iron-doped nano TiO2 powder is expected to be widely applied in the fields such as hydrogen production by photodecomposition of water, degradation of organic pollutants, and the like.

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Owner:ZHANJIANG NORMAL UNIV

Ferrochrome vanadate photocatalytic material with visible light response as well as preparation method and application thereof

ActiveCN104174408ANo emissionsEasy to prepareWater/sewage treatment by irradiationWater contaminantsChemical solutionSolid state reaction method

The invention discloses a ferrochrome vanadate photocatalytic material CrFe(VO4)2 with visible light response as well as a preparation method and an application thereof. The sample of a photocatalytic material is prepared by using a high-temperature solid-phase reaction method, a chemical solution method and a co-precipitation method; the production cost and device requirement are low; the prepared material is good in dispersion performance, uniform in granularity, good in chemical stability and optic stability; and the prepared photocatalyst sample CrFe(VO4)2 has relatively small spectrum width, excellent photocatalytic performance and good photocatalytic stability and good application prospect and has the effect of decomposing toxic chemical substances under visible light response.

Ferrochrome vanadate photocatalytic material with visible light response as well as preparation method and application thereof

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Owner:SUZHOU DEJIE MEMBRANE MATERIAL SCI & TECH

Emulsification device and method for safely preparing emulsion matrix

InactiveCN102976872AImprove the emulsification effectImprove mixing efficiencyExplosive working-up apparatusPolymer chemistryMaterial transfer

The invention relates to an emulsification device for safely preparing an emulsion matrix, which comprises a water-phase emulsification material transfer pump, a water-phase emulsification material transfer pipe, an oil-phase emulsification material transfer pump and an oil-phase emulsification material transfer pipe, wherein the water-phase emulsification material transfer pump and the water-phase emulsification material transfer pipe are connected; and the oil-phase emulsification material transfer pump and the oil-phase emulsification material transfer pipe are connected. The emulsification device is characterized by further comprising an emulsification mixer with a slope-shaped rectangular mixing cavity channel, an emulsification mixture transfer pipe, an emulsification time delay mixer with a built-in honeycombed filling material mixing pipe cavity and an emulsion matrix finished product discharge pipe, wherein the water-phase emulsification material transfer pipe and the oil-phase emulsification material transfer pipe are respectively connected with a water-phase emulsification material inlet cavity and an oil-phase emulsification material inlet cavity of the emulsification mixer; and the emulsification mixer, the emulsification mixture transfer pipe, the emulsification time delay mixer and the emulsion matrix finished product discharge pipe are sequentially connected. According to the emulsification method provided by the invention, two-phase emulsification materials are subjected to primary emulsification of the emulsification mixer and secondary emulsification of the emulsification time delay mixer, thus obtaining the emulsion matrix finished product. The invention has the advantages of high safety, good emulsification quality, high production efficiency and the like.