62results about How to "Primary particle size is small" patented technology

A layered lithium-nickel-based compound oxide powder for a positive electrode material for a high density lithium secondary cell, capable of providing a lithium secondary cell having a high capacity and excellent in the rate characteristics also, is provided. A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, characterized in that the bulk density is at least 2.0 g/cc, the average primary particle size B is from 0.1 to 1 μm, the median diameter A of the secondary particles is from 9 to 20 μm, and the ratio A/B of the median diameter A of the secondary particles to the average primary particle size B, is within a range of from 10 to 200. In production of a layered lithium-nickel-based compound oxide powder, which comprises spray drying a slurry having a nickel compound and a transition metal element compound capable of substituting lithium other than nickel, dispersed in a liquid medium, followed by mixing with a lithium compound, and firing the mixture, the spray drying is carried out under conditions of 0.4≦G/S≦4 and G/S≦0.0012 V, when the slurry viscosity at the time of the spray drying is represented by V (cp), the slurry supply amount is represented by S (g/min) and the gas supply amount is represented by G (L/min).

The invention relates to composite zirconium oxide microspheres and a preparation method thereof. The microspheres are prepared from yttrium oxide as a stabilizer of a zirconium oxide material. The microspheres comprises a doped system of third components including one or more of alumina, cerium oxide, copper oxide, magnesia, calcium oxide and silica, wherein the content of the yttrium oxide in the zirconium oxide is 0.1-8mol% while the total doping amount of the alumina, the cerium oxide, the copper oxide, the magnesia, the calcium oxide and the silica is 0-30wt%. According to the method, sediment dry gel is molded and further sintered to finish preparation of the composite zirconium oxide ceramic microspheres. The preparation method is simple in production technology, relatively low in cost, and applicable to industrialization. A lot of energy sources are saved for industrialization of the zirconium oxide ceramic microspheres. Meanwhile, the prepared ceramic microspheres disclosed by the invention have the characteristics of large density, durability, stability and the like.

A fine A-type zeolite particle having an average primary particle size of 0.1 mum or less and a variation coefficient of 90% or less, wherein a ratio of a peak area above a background level to all peak are in the range of 2theta=20° to 40° in a powder X-ray diffraction spectrum of said fine A-type zeolite particle is 30% or more; a process for preparing the fine A-type zeolite particle, comprising reacting a silica source with an aluminum source in the presence of an organic compound having an oxygen-containing functional group and a molecular weight of 100 or more; and a detergent composition comprising a surfactant and the fine A-type zeolite particle. The fine zeolite particle is suitably used for detergent builders, water treatment agent, fillers for paper, resin fillers, oxygen-nitrogen separating agents, adsorbents, catalyst carriers, soil improvers for gardening, polishing agents, and the like.

The invention discloses a method for synthesizing lithium iron phosphate anode material at low cost, which belongs to the technical field of energy materials. The method comprises the following steps: preparing a solution containing equimolar Li+ and H2PO4- from lithium salt and phosphoric acid directly; adding an iron source, an organic carbon source and an inorganic carbon source into the solution, and grinding the mixture in a stirring ball mill to obtain precursor slurry; spraying the precursor slurry, drying and granulating to obtain spherical precursor powder; and sintering the precursor powder in a rotary furnace under the protection of inert gas, and naturally cooling to the room temperature to obtain the product. As the solution containing equimolar Li+ and H2PO4- is directly prepared, the steps of reaction, purification, re-crystallization, drying and the like during the manufacturing of lithium dihydrogen phosphate are saved, and the cost of the raw materials is reduced by over 20%. Moreover, by adopting of a joint cladding means combining organic carbon and inorganic carbon, the method reduces the primary particle size (about 200 nm) of the lithium iron phosphate powder, improves the conductivity of the material and greatly enhances the electrochemical performance of the product.

The present invention provides a fine pigment composition which comprises organic pigment with extraordinarily small particle diameter and has remarkably restrained agglutination. The invention also provides a manufacturing method which can easily prepare the fine pigment composition. The fine pigment composition comprises triazine represented by a formula (1) and the organic pigment. In the formula (1), A represents an acid group or a base group; B represents -OH, -Cl, an acid group or a base group; and D represents -H, -Cl, -OH or aromatic amine residues.

The invention provides a preparation method of a lithium iron phosphate positive electrode active material, comprising: (1) firstly mixing a lithium source, an iron source and a doped element source,then sequentially adding a phosphorus source and a carbon source, uniformly mixing to obtain a mixed material; the mixture is placed in a double-cone dryer under solvent-free conditions, and the mixture is dried in a temperature range of 150 DEG C to 400 DEG C, and that heat preservation is performed for 8-12h to obtain dry material, crushing and refine that dry material by adopting a jet mill toobtain powder particles having a primary particle size of 100-200 nm; 2, sintering that powder particle to obtain a primary sintering material under a protective atmosphere, and crushing and refine the primary sintering material by a gas flow crusher to obtain a lithium iron phosphate positive electrode active material. The preparation method comprises the following steps of: adding raw materialsrequired for synthesizing lithium iron phosphate in a certain order without using a solvent; and sintering the raw materials in one step to obtain an end product with uniform size and excellent performance. The preparation method has the advantages of simple process, low energy consumption and environment friendliness.

The invention discloses a method for preparing hydrophobic white carbon black by using high-alumina fly ash. The method comprises the following steps of carrying out pressure mould lifting and refining treatment on a desilication solution obtained by carrying out alkali dissolution desilication reaction on high-alumina fly ash as a raw material and an alkaline solution; adding a mould lifting desilication solution and a sulfuric acid solution into a bottom alkaline solution prepared from the mould lifting desilication solution, carrying out a sectional acidification reaction including two-stage heating and two-step cocurrent flow precipitation method reaction until the pH value is reduced, and stopping curing reaction, wherein the Na2O concentration of the bottom alkaline solution is 0.080-0.090mol/L, and a dispersant is added into the bottom alkaline solution; filtering, washing, pulping, drying and smashing to obtain a hydrophobic nanometer silicon dioxide masterbatch; dropwise adding methylsilicone oil, a trimethylchlorosilane modifier and an alcohol catalyst which have different characteristics into the masterbatch, carrying out grafting reaction and reflux reaction, and drying to obtain the hydrophobic white carbon black. By using the method, the pore volume of the hydrophobic white carbon black is increased, the regrinding process flow is simplified, and the production cost of the hydrophobic white carbon black produced by using the traditional sulfuric acid method is reduced.

The invention discloses a preparing method of wrapping type phosphate ferromanganese. The method includes the steps of adding phosphoric acid to ferromanganese powder, conducting a stirring reaction until the ferromanganese powder is incompletely dissolved, conducting filtering, adding filtrate to hydrogen peroxide, starting to raise the temperature after adding is completed, conducting a stirringreaction to obtain ferric phosphate slurry, adding sodium dodecyl benzene sulfonate and then manganese carbonate, making manganese carbonate completely dissolved, continuing to add hydrogen peroxide,conducting filtering to obtain mother liquor and filter residues, adding the filter residues to pure water to be washed, drying the washed filter residues in a microwave dryer until the water contentis lower than 1%, and conducting screening, electromagnetic ferric removing and material mixing to obtain the wrapping type phosphate ferromanganese. The method is simple in process, low in cost andsmall in wastewater discharge amount, the phosphate ferromanganese material with ferric phosphate wrapped by manganese carbonate is obtained, the primary particle size is small, the shape is a spherical shape, the tap density is high, the specific surface is small, the size distribution is uniform, and the content of sulfate radicals and chloridion is low.

The present invention provides the following process for producing a fine organic pigment which is capable of producing the fine organic pigment that has a very small primary particle size and is excellent in filtering property even in a cleaning step, and a fine organic pigment produced by the process; a process for producing a dispersion using the fine organic pigment, and a dispersion produced by the process; and a process for producing an ink using the dispersion. The present invention relates to [1] a process for producing a fine organic pigment, including steps 1 and 2: step 1: kneading a mixture prepared by compounding a raw material organic pigment, a water-soluble inorganic salt, a water-soluble organic solvent and a compound represented by the following formula (1) with each other, the compound being compounded in an amount of not less than 0.8 part by mass and not more than 18.0 parts by mass on the basis of 100 parts by mass of the raw material organic pigment: R¹O(PO)_m(EO)_nA (1); and step 2: subjecting the mixture obtained in the step 1 to cleaning treatment with an aqueous solvent and then to filtration, [2] a fine organic pigment produced by the process according to the above aspect [1], [3] a dispersion produced using the fine organic pigment according to the above aspect [2], [4] a process for producing a paste of a fine organic pigment, including the above step 1 and 2, [5] a process for producing a dispersion, including step 3 of subjecting the paste of the fine organic pigment produced by the process according to the above aspect [4], an organic solvent and water to dispersing treatment, and [6] a process for producing an ink, including step 4 of mixing the dispersion produced by the process according to the above aspect [5] with at least one material selected from the group consisting of water and an organic solvent.

The invention discloses a preparation method of a lithium iron phosphate composite coated by double carbon layers. The preparation method comprises the following steps: step 1, evenly mixing an iron source, a phosphorus source and a lithium source at certain molar ratio into an ethanol solution to form a mixed solution, then adding and dissolving a carbon source into the mixed solution to form a first mixture, then adding an ordered mesoporous carbon into the first mixture, conducting ultrasonic treatment for a first preset time at the room temperature to form a second mixture; step 2, putting the second mixture into a container, conducting a hydrothermal reaction for a second preset time at a first preset temperature, cooling to form a third mixture, washing and drying the third mixture to prepare a carbon doped lithium iron phosphate composite; step 3, putting the carbon doped lithium iron phosphate composite into a container under the protection of nitrogen gas, calcining for a third preset time at a second preset temperature, cooling, taking out, alternatively washing with the deionized water and absolute ethyl alcohol sequentially for a plurality of times, and drying to obtain the lithium iron phosphate composite coated by the double carbon layers.

The invention discloses a preparation method of lithium iron borate. The preparation method comprises the following steps: mixing a lithium borohydride solution with a ferric nitrate solution and pouring a mixed solution into a sealed high-pressure reactor, carrying out hydrothermal reaction and then decompressing; absorbing the exported gas with ferric hydroxide slurry, adding aluminum citrate, uniformly stirring and mixing and then carrying out spray drying to obtain a dry material; sintering the dry material in an inert atmosphere, cooling to a temperature below 60 DEG C and discharging toobtain a calcined material; carrying out fluid energy milling on the obtained calcined material by using nitrogen, screening, removing iron and carrying out vacuum packaging to obtain a cathode material of the lithium iron borate. According to the preparation method of the lithium iron borate, disclosed by the invention, amorphous lithium iron borate is prepared by using the hydrothermal method, is coated with alumina citrate and is then calcined at high temperature to obtain the lithium iron borate coated with alumina and carbon; the lithium iron borate has the advantages of small primary particle size, good stability and good electrochemical property.

To optimize the primary particle size of a modified PTFE fine powder to shorten the sintering time during the extrusion molding.

A modified polytetrafluoroethylene fine powder which is a fine powder of a non-melt-processable modified polytetrafluoroethylene comprising units derived from tetrafluoroethylene, units derived from hexafluoropropylene, units derived from a perfluoro(alkyl vinyl ether) represented by CF₂═CFO—C_nF_2n+1 (n is an integer of from 1 to 6) and units derived from a (perfluoalkyl)ethylene represented by CH₂═CH—C_mF_2m+1 (m is an integer of from 3 to 7).

The invention discloses a preparation method of a sodium vanadium phosphate type sodium battery positive electrode material. The method comprises the following steps: dissolving vanadium trichloride, ferric trichloride and phosphorous acid in anhydrous alcohol, then adding an ammonia gas-alcohol solution, then pouring into a hydrothermal reaction kettle, then introducing nitrogen, discharging air in the hydrothermal reaction kettle, then heating, reacting at high temperature and high pressure, and filtering the obtained slurry to obtain a solid and filtrate; adding hydrogen peroxide into the obtained solid for slurrying, then reacting, and filtering and washing the obtained solid particles to obtain a ferrovanadium phosphorus precipitate; adding a sodium phosphate solution and ammonium dihydrogen phosphate into the ferrovanadium phosphorus precipitate, then adding a dispersing agent, stirring and slurrying, and carrying out spray drying to obtain a spray-dried material; and calcining the obtained dried material, keeping the calcining process in a nitrogen atmosphere, and then screening to remove iron, thereby obtaining the sodium ion battery material. The sodium vanadium phosphate type sodium battery positive electrode material is small in primary particle size, good in rate capability, high in capacity, simple to prepare and low in cost.