1731results about How to "Small specific surface area" patented technology

The invention relates to the melting coating of alcohol-base or water-base anti-penetrating sands, which uses the fireproofing bone materials, the floating agent, the felting agent, the reinforcing agent and the carrier as the preparing coating. The weight shares of the said coating are: 100,3-8,3-7,0.2-1.0 and 30-40. The invention uses chrome iron minerals as the main materials and is prior to any kinds of the traditional coating.

The invention provides a metal organic framework material used for absorbing and separating CO2 and a preparation method thereof. The metal organic framework material is a rigid metal carboxyl compound cluster-like structure which is formed by transition metal ions and multidentate organic ligands through covalent bonds and intermolecular forces. An amine polymer is modified on the metal organic framework material; and the metal organic framework material used for absorbing and separating the CO2 has a specific surface area of 1,000 to 1,200 m<2>/g, and a pore volume of 0.4 to 0.6 cm<3>/g. The preparation method comprises the following steps of: respectively dissolving the nitrate, the chloride or the carbonate of copper or zinc and 1,3,5-trimesic acid together in a stoichiometric ratio in water or an organic solvent; mixing uniformly and sufficiently to react to obtain a BTC bridged complex crystal; and applying a product obtained by reacting an obtained BTC bridged complex crystal with the solution of polyethyleneimine to the metal organic framework material used for absorbing and separating the CO2. The material can realize selective absorption of a gas under a low pressure.

The invention relates to a carbon-coated nano silicon/graphene/cracked carbon layer composition material, a preparation method thereof, and a lithium ion battery including the composition material. The composite material comprises spherical particles formed by uniformly dispersing carbon-coated nano silicon in graphene sheets, and a cracked carbon layer which coats the surfaces of the spherical particles. The carbon-coated nano silicon comprises nano silicon and carbon coating layer which coats the surface of the nano silicon. The method is simple, has excellent process performance and is environment-friendly. The carbon-coated nano silicon/graphene/cracked carbon layer composition material has stable structure and high compact density, has excellent performance when being used as an anode material of the lithium ion battery, has high anode capacity, excellent rate capability and cyclic performance, is more than 1500 mAh/g in first-time reversible capacity, is more than 90% in first-time coulomb efficiency and is more than 90% in 500-time cyclic capacity retention ratio and has low expansion.

The invention belongs to the technical field of nano composite materials and particularly relates to a metal organic frame composite material and a preparation method thereof. The preparation method comprises the steps of adding metal ions and organic ligand into polymer nanowire solution with a core-shell structure to form mixed solution; under the room temperature, crystallizing to obtain the polymer nanowire composite with the metal organic frame/core-shell structure. The composite has the geometric shape same as that of the crystal of the pure metal frame compound, the polymer nanowires penetrate through and cover the single crystal particle, and the particles are connected by the polymer nanowires. In addition, the metal organic frame nanowire network composite growing along the polymer nanowires can be obtained. Due to addition of the polymer nanowires, functional groups or particles can be introduced, and the functionality of the metal organic frame composite material is improved. The composite material has the advantages that the preparation process is simplified, the stability of macroscopic aggregates of the material is improved and the actual application of the material is facilitated.

The invention discloses an attapulgite clay porous porous ceramsite, a preparation method of the ceramsite, and a purpose of the ceramsite. The ceramsite is prepared from raw materials of attapulgite clay and biomass, and a binder of industrial soluble glass. The ceramsite is prepared through calcining and oxidizing. The attapulgite clay porous ceramsite prepared by the present invention has advantages of high porosity, large specific surface area, high strength, strong water resistance, high water absorption, high catalytic activity, and the like. The porous ceramsite prepared by the presentinvention can be applied as a carrier for a catalyst, and a filling material for an aerated biological filter.

This invention discloses one second battery anode and negative conductive agent and its process method by use of carbon nanometer tube and acetylene black compound, wherein, the method comprises the following steps: Processing the mother liquid with concentration of 0.5 to 8 percent by adding the carbon nanometer tube and acetylene black compound into dispersion agent; or after adding the dispersion agent water or organic agent to dissipate the nanometer tube to process the low concentration mother liquid with 0.5 to 8 by adding acetylene black; The mother liquid passes filter or pressing to process compound conductive agent with dry weight of 6 to 60 percent. Comparing with conductive carbon or fiber, the nanometer tube has high capacity with high charging efficiency,

The invention discloses a coated-modified lithium manganese positive electrode material and the preparation method thereof. A manganese source compound, an M source compound and a lithium source compound are taken as raw material for preparing LiaMn2 -bMbO4 particles, and then are mixed with molten solvent and A-source compound, so as to obtain coated-modified lithium manganese positive electrode material. Compared with the prior art, the LiaMn2-bMbO4 particles are similar to spheres in shape and are in crystal face connection through curved surfaces which have no clear edges; on one hand, the LiaMn2 -bMbO4 particles have very small specific surface area, so that molten solvent and coating material are more evenly dispersed on the surfaces of the particles, and the control to average thickness of a coating is facilitated; on the other hand, the features have very small surface energy, the coating material is enabled to be more easily to be combined with the LiaMn2 -bMbO4 particles to form the coating. Therefore, the coated-modified lithium manganese positive electrode material has an excellent high temperature cycling performance.

The invention provides a cathode material of a lithium ion battery. The cathode material is composed by the atomic ratio shown in formula (I): Lia(MxMn2-x)(O4-yZy), wherein a is greater than or equal to 0.8 and less than or equal to 1.2; x is greater than or equal to 0 and less than or equal to 1; y is greater than or equal to 0 and less than or equal to 1; M is one or more selected from Li, Na, K, Ca, Mg, Al, Ti, Sc, Ge, V, Cr, Zr, Co, Ni, Zn, Cu, La, Ce, Mn, Hf, Nb, Ta, Mo, W, Ru, Ag, Sn, Pb and Si; and Z is one or more selected from OH, halogens, N, P, S and O. Primary particles of the cathode material have sphere-like morphologies, wherein (111) face is connected with adjacent equivalent crystal face through a curved surface having no clear edges. The invention also provides a preparation method for the cathode material of the lithium ion battery and the lithium ion battery. The cathode material provided by the invention has good high-temperature cycling performance and good filling property.

The invention relates to a high-performance silicon-carbon cathode material and a preparation method thereof. The preparation method comprises the following steps: (1) dispersing silicon into a solvent, carrying out liquid-phase ball-milling, so as to obtain nano-silicon dispersion liquid, adding graphite, and carrying out liquid-phase ball milling so as to uniformly mix nano-silicon with graphite; (2) carrying out granulation on slurry obtained the step (1), so as to obtain graphite/nano-silicon composite particles; (3) carrying out granulation on the product of the step (2) and asphalt by virtue of a mixed kneading-pressing-crushing method, so as to obtain graphite/nano-silicon/asphalt composite particles, and carrying out mechanical fusion so as to realize spheroidization and uniform coating of the graphite/nano-silicon/asphalt composite particles in one step; and (4) carrying out carbonization, scattering and sieving, so as to obtain the high-performance silicon-carbon cathode material. The preparation method is simple and low in cost and can be used for easily producing the high-performance silicon-carbon cathode material in large scale.

The invention relates to a Fe3O4/C magnetic nano solid extracting agent coated with a novel carbon material, belonging to the field of chemical analysis and test instruments and equipment. The extracting agent simultaneously has large special surface area of nano material, short disperse path, magnetic separation capacity of magnetic material and strong adsorption capacity of carbon material, thereby being very suitable for pretreating large-scale and large-size water samples in batch. In addition, the solid extracting agent is simple to prepare, low in raw material cost, rapid and convenientto extract and friendly to the environment and only needs using a small amount of organic solvent in the whole process.

The invention provides a preparation method of lithium iron phosphate of a lithium-ion secondary battery positive electrode active material, the method comprises: a ferrous source compound, a phosphorus source compound, a lithium source compound and a carbon source compound are mixed, the first sintering is carried out on the obtained mixture under the protection atmosphere, products in the first sintering are ball-milled and dried, the second sintering is further carried out to obtain the lithium iron phosphate, wherein, the method further comprises the heating of the mixture at the temperature of 60-250 DEG C under the oxidation atmosphere before the first sintering or after the first sintering. The lithium iron phosphate which is obtained by adopting the method can have both high volume specific capacity and excellent high-current discharge performance.

The invention discloses a modified steel slag composite admixture and a preparation method thereof. The modified steel slag composite admixture comprises 55-75wt% of micro mineral slag powder, 20-40wt% of micro steel slag powder, and 1-5wt% of sintering desulphurization slag. Concrete prepared by mixing the modified steel slag composite admixture of the invention with cement has the following characteristics: the seven day active index is greater than 75%, the twenty-eight day active index is greater than 100%, the specific surface area is equal to or greater than 400m<2>/kg, the sulfur trioxide content is equal to or less than 4.0%, the chloride ion content is equal to or less than 0.06%, the ignition loss amount is equal to or less than 3.0%, and the autoclaving stability is qualified. The modified steel slag composite admixture which allows a low early strength disadvantage of steel slag composite admixtures to be overcome, working performances of concrete to be effectively improved, the strength and the endurance of concrete to be improved, and energy consumption required by slag grinding to be effectively reduced and is in favor of the low carbon economy realization, is a resource use type concrete admixture.

The invention relates to a lithium ion battery composite cathode material and a preparation method thereof, which belongs to the technical field of lithium ion battery. The invention aims at improving the cycle performance of silicon cathode material at the same time when keeping the high ratio volume of lithium ion battery silicon cathode material. The proposal of the invention is that silica-based material coated by disordered carbon is treated with surface modification processing by utilizing lithium salt, namely, the lithium salt is coated on the surface of Si/G/DC (silicon/graphite/disordered carbon) to be prepared into the composite cathode material, therefore, the lithium-embedding and removing depth of the silicon can be effectively controlled, and the material is the lithium ion battery composite cathode material which has high specific capacity and good cyclical stability; furthermore, the material is safe and pollution-free, and presents higher thermal stability in various lithium salt electrolytes and solvents.

The invention relates to a heat-conductive gap interface material and a preparation method thereof. The heat-conductive gap interface material comprises 100 parts by weight of a resin matrix and 250-400 parts by weight of heat-conductive fillers, and also comprises an assistant; and the preparation method comprises the following steps: adding the assistant and the resin matrix into a stirrer, and carrying out first stirring to obtain a mixture; and adding a heat-conductive filler (2), carrying out second stirring, adding a heat-conductive filler (1), carrying out third stirring, and curing to obtain the heat-conductive gap interface material. The heat-conductive gap interface material has a small hardness, can avoid damages caused in the assembling process of microelectronic components, and can also fully fill the gaps of the microelectronic components.

The invention discloses a cathode material of a lithium ion battery. The cathode material has an atomic ratio of LiaMxMn(2-x)O(4-y)Zy. Primary particles of the cathode material of the lithium ion battery are substantially spherical, and the surface of each primary particle consists of 2 to 120 multilayer crystal dislocation frustums. The invention provides a preparation method of the cathode material of the lithium ion battery. The cathode material of the lithium ion battery is prepared by annealing, cooling and grinding a lithium manganate precursor in a roasting treatment mode of repeatedly changing roasting temperature. The invention has the advantages that by repeatedly changing the roasting temperature in the roasting process, the prepared cathode material of the lithium ion battery has a dislocation structure, and the mobility of ions and electrons from the inner part of the material to the outer part of the material is improved, and the magnification performance of a lithium manganate material is improved. Because the cathode material is substantially spherical, the specific surface area of the lithium manganate material is reduced, and manganese is difficult to dissolve, so the cathode material of the lithium ion battery is high in high-temperature cycle performance.

The invention provides a magnetic mesoporous silica gel material extracting agent used for enriching and/or separating trace organic pollutants in an environment water sample, and a preparation method thereof. A core of the extracting agent provided by the invention is a silicon gel microsphere (i.e. magnetic silicon gel microsphere) wrapped with a plurality of Fe3O4 magnetic nano particles, and a shell of the extracting agent is a mesoporous silicon gel shell layer with inner and outer surfaces modified by C18 silanization. The extracting agent integrates huge special surface area, excellent extracting capacity and ultrahigh extracting volume of a mesoporous material, magnetic separating capacity of a magnetic material, strong extracting capacity of C18 groups and special volume exclusion function of a vertical channel of the mesoporous material. In addition, the extracting agent provided by the invention has the advantages of high extracting efficiency, low preparation cost and simple preparation method, and is very suitable for preprocessing samples of the trace organic pollutants in a bulk-mass water sample.

The invention relates to a three-dimensional network porous heat-conducting heat radiation device and a preparation method thereof. The three-dimensional network porous heat-conducting heat radiationdevice comprises foam metal, high-heat-conduction high-heat-radiation material and a phase-changing heat transferring material, wherein the heat transferring performance is improved by virtue of the phase-changing heat transferring material filling pores inside a foam metal skeleton wire net, the heat radiation performance is improved by virtue of the high-heat-conduction high-heat-radiation material smeared on the surface of the foam metal skeleton, and the three-dimensional network porous heat-conducting heat radiation device is suitable for the electron industry and solves the heat radiation problem of heating elements and devices.

The invention discloses a high-nickel ternary positive electrode material with single crystal morphology and a preparation method of the high-nickel ternary positive electrode material. The positive electrode material is formed by a base material and a coating layer, wherein the base material is prepared from a high-nickel ternary precursor, a lithium source and a doping agent; the doping agent comprises a doping element, the doping element is a metal element, the coating layer is formed by a coating material, the coating material comprises a coating element, and the coating element is a metalelement and/or a non-metal element. The positive electrode material is obtained by mixing the high-nickel ternary precursor, the lithium source and the doping agent, performing primary sintering, then mixing with the coating material, and performing secondary sintering. The high-nickel ternary positive electrode material disclosed by the invention has the advantages of single crystal morphology,smooth surface, small specific surface area and high compaction density, and the single crystallization of the high-nickel ternary positive electrode material improves the specific capacity and cycleperformance of the positive electrode material and prolongs the service life of the positive electrode material. The preparation method is simple in process, easy to implement and beneficial to industrial large-scale production.

The invention relates to a method for preparing monodispersed silver powder with high tap density and low agglomeration, and the method is implemented through the following steps of uniformly mixing an acidic silver salt solution with a mixed reducing solution containing a L-ascorbic acid, a protective agent and a surfactant, and stirring the obtained mixture for reaction; and cleaning and then drying the obtained precipitate so as to obtain the monodispersed silver powder with high tap density and low agglomeration. Compared with the prior art, the silver powder prepared by using the method disclosed by the invention is high in tap density, small in particle diameter and dispersive range, high in degree of sphericity of particles, smooth in surface, small in specific surface area and easy for realization of mass production.

The invention relates to the preparation method of a small crystal ZSM-5/mordenite composite molecular sieve, mainly solving the problems in the existing preparation process of ZSM-5/mordenite composite molecular sieve of bigger crystal of the composite molecular sieve, low catalytic activity and fast activity loss in the reaction in which ethene and propylene are prepared by the catalyzing and cracking of naphtha. The invention well resolves the problems by adopting the technical proposal that the ZSM-5 with decent silica alumina ratio and the crystal seed of mordenite is added in the synthetic process of the molecular sieve and the PH value of the molecular sieve raw material solution system is adjusted to 9-14 in the preparation process. The ZSM-5/mordenite composite molecular sieve prepared by the method can be applied in the industrial production, in which ethene and propylene are prepared by the catalyzing and cracking of naphtha.