1402results about "Titanium dioxide" patented technology

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention relates to the technical field of photovoltaic silicon crystal waste treatment, and discloses a method for preparing a porous silicon carbon negative electrode material with good conductivity from photovoltaic silicon crystal waste, and the method comprises the following steps: step 1, preparing micron-sized silicon particles; step 2, preparing micron-sized porous silicon particles; step 3, preparing nano-scale porous silicon particles which are coated by TiO2 and are supported by an N-crosslinked carbon skeleton; and 4, preparation of porous silicon carbon negative electrode particles with good conductivity: mixing TiO2 coated and N-crosslinked carbon skeleton supported nanoscale porous silicon particles with a carbon-containing compound and a B-containing sintering aid, introducing the mixture into a rotary furnace for sintering, and constructing an outermost amorphous carbon coating layer. The raw material of the prepared silicon-carbon negative electrode particle is derived from photovoltaic silicon crystal waste, the production cost is low, the prepared silicon-carbon negative electrode material with good conductivity is of a core-shell structure, the volume expansion effect of the material can be effectively relieved, the conductivity is improved, the high-rate discharge performance of a battery is improved, and the cycle life is prolonged.

The invention is applicable to the technical field of porous materials, and relates to multistage ordered macroporous-mesoporous titanium dioxide and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing a superstructure photonic crystal solid; (2) forming a light yellow solution with the concentration of 0.2-0.5 mol / L; and (3) adding the superstructure photonic crystal solid in the step (1) into the light yellow solution in the step (2) to prepare the multistage ordered macroporous-mesoporous titanium dioxide. The preparation method has the beneficial effects that in the preparation method of the multistage ordered macroporous-mesoporous titanium dioxide disclosed by the invention, the stability of a mesoporous superstructure unit can be ensured, and accurate and perfect copying of a pore channel structure can be realized; the separation efficiency of photo-generated charges and photo-generated holes of the titanium dioxide disclosed by the invention in photocatalytic water decomposition is greatly improved, and due to the multi-stage ordered macroporous-mesoporous structure, multiple scattering of incident light in a porous frame can be ensured, so that the efficiency of hydrogen production by photocatalytic water decomposition is improved.

The invention provides an alkaline ion battery negative electrode material as well as a preparation method and application thereof, and particularly relates to an MXene / MoS2 / TiO2 composite material which is prepared by the following steps: etching an MAX phase by using mixed acid containing HF to obtain MXene; performing freeze drying to obtain powder containing MXene, a Mo source and an S source; and calcining to obtain the composite material. According to the negative electrode material disclosed by the invention, MoS2 is supported by utilizing high conductivity of MXene and structural collapse of the MoS2 is relieved, and TiO2 enhances cycle stability, is designed for a negative electrode of an alkaline ion battery and shows good cycle performance. MXene is obtained by etching an MAX phase with mixed acid, the composite material is prepared by combining freeze drying and calcination, NH prevents MXene from stacking and expands interlayer spacing, MoS2 is formed after calcination, and a small amount of TiO2 is generated in situ. And the single-layer MXene is used as a binder to replace a traditional material, so that the electrochemical performance of the composite electrode is improved.

The invention discloses a silicon-carbon material and a preparation method and application thereof, belongs to the technical field of negative electrode materials, and overcomes the defect of high volume expansion rate of a silicon-based material in the prior art. The silicon-carbon material provided by the invention comprises porous carbon and silicon deposited in porous carbon channels; the porous carbon comprises mesopores and macropores, the pore diameter of the mesopores is greater than 10nm and less than or equal to 50nm, and the pore diameter of the macropores is greater than 50nm and less than or equal to 100nm; based on the total volume of the pores in the porous carbon, the volume fraction of the mesopores is 50%-75%, and the volume fraction of the macropores is 10%-20%; and the silicon deposited in the mesopores and the macropores is a hollow silicon nanotube. Silicon in the silicon-carbon material mainly exists in the form of hollow silicon nanotubes, and during lithium intercalation expansion, since expansion spaces are reserved in the hollow nanotubes, the lithium intercalation expansion of the whole silicon-carbon material is reduced.

The invention belongs to the technical field of battery material production, and particularly relates to a preparation method of high-purity titanium dioxide for batteries. The invention aims to provide a preparation method of high-purity titanium dioxide for a battery. The preparation method is used for solving the technical problem that the impurity removal rate is not increased by improving a preparation method of an additional seed crystal and optimizing procedures in the prior art. The titanium slag is used as a raw material, a metatitanic acid crude product is obtained after alkali baking pretreatment, acidolysis and hydrolysis, redundant impurities are removed through subsequent procedures, and the high-purity titanium dioxide for the battery is obtained. The titanium slag subjected to alkali roasting treatment is changed in component structure, the concentration and temperature of sulfuric acid required by acidolysis are greatly reduced, oxalic acid and a complexing agent are added in the hydrolysis process to hydrolyze titanium ions to form metatitanic acid, the purity of the metatitanic acid is greatly improved, seed crystals prepared through ultrasonic treatment are added, and the prepared metatitanic acid can be calcined at a low temperature to form rutile type titanium dioxide. The prepared titanium dioxide has high purity and relatively high specific surface area.

The invention discloses a preparation method based on hollow double-shell nanofiller and application of the hollow double-shell nanofiller in preparation of a transparent heat-insulating coating, and belongs to the field of heat-insulating coatings. The preparation method comprises the steps that firstly, PMMA-coated TiO2 core-shell sphere powder is prepared; ultrasonically dispersing the prepared PMMA-coated TiO2 core-shell sphere powder into an aqueous solution of isopropanol, and adding acetic acid to adjust the pH value, so as to prepare a core-shell sphere PMMA-coated TiO2-coated SiO2; calcining the core-shell sphere PMMA (at) TiO2 (at) SiO2 to prepare a TiO2 (at) SiO2 sphere with a double-shell hollow structure; the preparation method comprises the following steps: mixing waterborne polyurethane, a solvent, a thickening agent, a curing agent, an auxiliary agent and DHTS, standing, and discharging bubbles to prepare the hollow double-shell nanofiller. The hollow double-shell nanofiller disclosed by the invention can realize the effects of high transmittance, heat insulation and fog prevention.

The invention belongs to the field of lithium battery negative electrode materials, and particularly relates to a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material comprises RGO with a three-dimensional skeleton structure and TiO2 (at) SiO (at) Si particles compounded on the RGO, each TiO2 (at) SiO (at) Si particle comprises a Si inner core, a SiO layer coated on the surface of the Si inner core and a TiO2 layer coated on the surface of the SiO. The preparation method is characterized in that a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is designed and synthesized, SiO and TiO2 double-layer coating is carried out on a Si core in sequence, and TiO2 (at) SiO (at) Si particles are uniformly compounded on RGO with a three-dimensional skeleton structure, so that the TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is obtained. The obtained TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material not only can effectively inhibit volume expansion when the silicon-based negative electrode material is applied to a lithium ion battery, but also is beneficial to promoting electron transfer, so that the rate capability, the first effect performance and the cycle performance of the silicon-based negative electrode material are improved.

The invention discloses a sulfuric acid method titanium dioxide hydrolysis seed crystal, titanium dioxide and a preparation method thereof. The preparation method comprises the following steps: 1, respectively preheating a titanyl sulfate solution and an alkali solution; step 2, introducing the preheated titanyl sulfate solution and alkali solution into a micro-channel reactor at a flow rate of 5-15 mL / min, and reacting for 2-10 min at a temperature of 85-95 DEG C to prepare a seed crystal; and step 3, cooling the seed crystal prepared in the step 2. The titanium dioxide prepared by the method is uniform and controllable in particle size, and the process is simple and easy to implement. The titanium dioxide prepared by using the seed crystal is pigment-grade titanium dioxide, the D90 of the titanium dioxide is 0.5-0.6 mu m, the L * of the titanium dioxide is 98.70-98.75, the b * of the titanium dioxide is 1.40-1.55, and the lightening power of the titanium dioxide is 110-115%.

The invention discloses a preparation method and application of polyester. In the preparation stage of the catalyst, a sol-gel method and a hydrothermal method are adopted to prepare a titanium dioxide precursor with good dispersity. Subsequently, through an accurate alkali treatment process, the titanium dioxide precursor is converted into a titanium dioxide nanotube with excellent catalytic performance and structural stability, synthesis of polyester can be efficiently catalyzed, and the titanium dioxide nanotube is a green, non-toxic and low-cost polyester catalyst.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention relates to the field of glaze, in particular to a method for preparing antibacterial glaze from zirconium silicate, high-temperature-resistant rare earth ions are introduced into the glaze to enhance the antibacterial property of the glaze, so that the glaze still keeps a relatively high antibacterial effect after being sintered at a high temperature; the components of the glaze are matched, a composite dispersing agent is introduced during preparation of the glaze for wet ultrafine grinding, and the glaze surface formed by the prepared antibacterial glaze has the effects of self-cleaning, formaldehyde removal and the like by controlling the material ratio; nano-scale erbium-doped zirconium silicate which is narrow in particle size distribution and free of agglomeration is synthesized, and silver-bismuth modified composite titanium dioxide is synthesized, so that the high temperature resistance of the composite titanium dioxide is enhanced, and the composite titanium dioxide still keeps excellent antibacterial performance after being sintered at a high temperature; during wet ultrafine grinding, when 2.2-2.8% of a composite dispersant compounded by modified acrylic acid and polyethylene glycol is added, a glaze surface formed after sintering is compact, so that the self-cleaning property of the glaze is greatly improved.

The invention provides a ternary precursor sequentially coated with titanium and aluminum and a preparation method and application thereof. The ternary precursor comprises a ternary precursor core, and the exterior of the ternary precursor core is sequentially coated with a titanium oxide middle layer and an Al (OH) 3 outer layer. The preparation method comprises the following steps: coating a ternary precursor core with a titanium oxide intermediate layer and an Al (OH) 3 outer layer to obtain a ternary precursor, calcining when the ternary positive electrode material is prepared, dehydrating the Al (OH) 3 outer layer to form an Al2O3 outer layer, inhibiting the volume expansion and shrinkage of the core in the ternary positive electrode material by the titanium oxide intermediate layer and the Al2O3 outer layer, and isolating the ternary positive electrode material from an electrolyte, so that the ternary positive electrode material is prepared. The surface side reaction of the ternary positive electrode material is inhibited; besides, through sequential coating of the titanium oxide intermediate layer and the Al2O3 outer layer, a continuous and defect-free compact layer formed during single coating of the titanium oxide intermediate layer and the Al2O3 outer layer can be avoided, so that lithium ion diffusion is facilitated.

The invention discloses a device and method for separating a titanium dioxide primary product and residual chlorine, the device comprises an outer cylinder, a spiral assembly and a negative pressure device, the spiral assembly is arranged in the outer cylinder; the spiral assembly comprises an inner barrel and a spiral plate, the inner side edge of the spiral plate is fixed to the outer wall of the inner barrel in a threaded mode, and the outer side edge of the spiral plate is adjacent to the inner wall of the outer barrel; a vent hole penetrating into the outer cylinder body is formed in the inner cylinder body; a first end of the inner cylinder is provided with a gas inlet, and a second end of the inner cylinder is provided with a gas outlet; and the negative pressure equipment is communicated with the gas outlet. By arranging the negative pressure equipment, matching with the vent holes and combining with a spiral stirring and conveying feeding mode, the separation efficiency can be greatly improved, and the chlorine content on the surface of titanium dioxide can be greatly reduced. And the separated chlorine gas is collected, enriched and recycled, or is absorbed by alkali liquor, so that the harm of the chlorine gas to the environment and human bodies is reduced.

The invention belongs to the technical field of wastewater multi-stage treatment, and particularly relates to a titanium dioxide production wastewater multi-stage treatment device which comprises a filter tank, a water inlet pipe is fixedly mounted on one side of the filter tank, a water outlet pipe is fixedly mounted at the bottom of the filter tank, and an electrolysis tank is fixedly mounted at the end, away from the filter tank, of the water outlet pipe. A rotary filtering assembly is arranged in the filtering box, comprises a filtering net and is used for filtering the wastewater through the filtering net. When waste water is filtered through the rotary filtering assembly, the rotary filtering assembly enables the filtering net to rotate at a constant speed, the filtering net rotates at the constant speed so that the waste water can make uniform contact with the filtering net in the filtering box, and after the waste water enters from the water inlet pipe, the waste water is not concentrated in a certain area of the filtering net to be filtered but rotates along with the filtering net; impurities in the wastewater can be gradually intercepted on the surface of the whole filter screen, so that the local filter screen is prevented from being blocked due to too fast accumulation of the impurities.

The invention discloses a composite material with GO simultaneously loaded with Ni-TiO2, which is characterized in that tetrabutyl titanate, dimethylformamide, nickel nitrate hexahydrate, terephthalic acid and a single-layer graphene aqueous solution are used as raw materials, Ni-MOF / Ti-MIL-125 is obtained through a solvothermal method, then Ni and Ti are compounded with GO by using the hydrolysis characteristic of an MOF material to obtain Ni-Ti-GO, and finally Ni-TiO2-GO is obtained through a calcination method. A preparation method of the Ni-MOF / Ti-MIL-125 composite material comprises the following steps: 1, preparing Ni-MOF / Ti-MIL-125; 2, preparation of Ni-Ti-GO is carried out; and 3, the preparation of the Ni-TiO2-GO is carried out. When the magnesium hydride composite hydrogen storage material based on Ni-TiO2-GO is applied as a hydrogen storage material, the initial dehydrogenation temperature is 182-205 DEG C, and when the dehydrogenation temperature is 250 DEG C, the hydrogen desorption amount is 3.66-3.82 wt%; under the conditions that the hydrogen absorption temperature is 30 DEG C and the hydrogen absorption time is 3550-3600 seconds, the hydrogen absorption amount is 1.80-1.81 wt%.

The invention provides a lithium metal negative electrode current collector, a preparation method thereof and a lithium metal battery, and the method comprises the following steps: carrying out single-side treatment on carbon cloth in oxygen plasma for 8-12 seconds to obtain gradient activated carbon cloth; the preparation method comprises the following steps: dissolving Zn (NO3) 2 and urotropine in water, and slowly adding ammonia water to obtain a colorless and transparent precursor solution; and transferring the precursor solution into a polytetrafluoroethylene liner, carrying out hydrothermal reaction on the precursor solution and gradient activated carbon cloth, cooling to room temperature, and washing and drying to obtain the lithium metal negative electrode current collector. The three-dimensional carbon cloth current collector with longitudinal zinc oxide gradient distribution is obtained through single-sided oxygen plasma treatment and a one-step hydrothermal method, and meanwhile, lithium is induced to deposit from bottom to top and uniformly grow in a three-dimensional carbon cloth framework with ZnO lithium-loving sites gradient distribution by effectively controlling the concentration distribution of ZnO, so that the formation of lithium dendrites is inhibited; the cycle stability of the electrode is improved, and long cycle stability and high energy density of the lithium battery are realized.

The invention mainly relates to the technical field of high-performance ceramic filler nano titanium dioxide, and discloses a preparation method of high-dispersion nano titanium dioxide, which comprises the following steps: slowly dropwise adding a pretreated titanium source into a mixed solvent to prepare a titanium source solution; the preparation method comprises the following steps: adding water and a mixed inhibitor into a reaction kettle, uniformly stirring, slowly dropwise adding the prepared titanium source solution into the reaction kettle, and continuously stirring in the dropwise adding process; cooling the product to room temperature, adding a dispersing agent, aging for a period of time, and slowly adding nano silicon dioxide sol; washing the aged product, and then carrying out vacuum drying treatment; and calcining the dried product at 300-350 DEG C for 1-1.5 hours, then heating to 480-550 DEG C, calcining for 2-2.5 hours, and controlling the heating rate to be 1.5-2 DEG C / min, thereby obtaining the nano titanium dioxide product with uniform granularity and high dispersity after calcining. According to the invention, through optimization of the preparation process, the particle size of the nano titanium dioxide is in a small range, and good particle size uniformity and dispersibility are still kept.

The invention relates to the technical field of lithium ion battery negative electrode material optimization, and discloses a porous carbon coated modified negative electrode material preparation method, which comprises: S1, low temperature pre-carbonization: forming an organic frame structure under the action of a carbon source, a nitrogen doping agent, a structure regulating agent and a sacrificial template; s2, etching to form a graded pore structure, and removing the sacrificial template by adopting a chemical etching method to form a carbon material framework with specific pore distribution; s3, high-temperature carbonization and structure reconstruction: performing high-temperature carbonization in an inert atmosphere to crystallize the carbon material, and optimizing pore distribution through atmosphere regulation and control; and S4, a porosity control method of the negative electrode material, wherein the pore distribution is regulated and optimized through the etching time and atmosphere. The conductivity, the structural stability and the compatibility with electrolyte of the negative electrode material are remarkably improved through cold plasma treatment and a low-temperature sintering technology, and the high-rate discharge capacity and the long-period stability of the battery are enhanced.

The invention belongs to the technical field of catalysts, and particularly relates to a catalyst, a preparation method thereof and application of the catalyst in preparation of benzonitrile from oxidized polystyrene. The catalyst is obtained by carrying out heat treatment on a mixture of urea and TiO2, and the specific preparation method comprises the following steps: firstly, dropwise adding a hydrogen fluoride aqueous solution into tetrabutyl titanate, and uniformly mixing to obtain a milk white gel precursor; then putting the milk white gel precursor into a high-pressure kettle, heating for a period of time, cooling to room temperature to obtain a white solid, washing and drying to obtain TiO2 powder; the preparation method comprises the following steps: adding urea into TiO2 powder, uniformly mixing, and calcining the mixture in air at high temperature to obtain the oxygen vacancy-rich catalyst TiO2-Ov-x (Ov represents oxygen vacancy and x represents the mass of urea added corresponding to every 2 g of TiO2 powder, g). The preparation method of the catalyst is simple, and the catalyst still has good stability after being recycled and calcined for 7 times, and has high catalytic activity for oxidizing polystyrene into benzonitrile.

The invention discloses a method for preparing high-quality artificial rutile through strengthened acid leaching of ilmenite concentrate, and belongs to the technical field of metallurgy. The method is used for solving the problems that a titanium-rich material obtained by an existing titanium-rich material preparation process is high in impurity content; and low-concentration acid leaching cannot achieve an efficient leaching effect. According to the method, a magnetic field is added in the acid leaching process. By means of the method, efficient leaching of titanium and iron elements under the low-concentration acid condition can be achieved, and the obtained artificial rutile is high in grade, high in efficiency and good in leaching effect.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

The invention relates to an oxygen-deficient nano material and a solid-phase melting zinc thermal reduction preparation method and application thereof, zinc powder is taken as a reducing agent, target metal oxide such as anatase type TiO2 and zinc powder are uniformly mixed, then mild high-temperature annealing treatment is carried out in an inert gas atmosphere, a product is washed by dilute acid / alkali, and the oxygen-deficient TiO2-x nano material is obtained. Similarly, oxygen deficient SnO2-x, ZrO2-x, and BaTiO3-x materials can be produced by such methods. Compared with the existing technologies of high-temperature hydrogen reduction, complex structure carbonization, solvothermal reduction and the like for preparing the oxygen-deficient nano material, the preparation method disclosed by the invention adopts a solid-phase molten zinc thermal reduction technology, takes environment-friendly and low-cost zinc powder as a reducing agent, and prepares the oxygen-deficient nano material by utilizing a solid-phase molten zinc thermal reduction process at a mild high temperature; the preparation method has the advantages of simple process, no special requirement on production equipment, processing universality and industrial production compatibility, successfully prepares a series of defect nanometer materials with adjustable oxygen defect concentration, and effectively prolongs the cycle life of the zinc battery by applying the defect nanometer materials to the negative electrode protection of the zinc ion battery.

The present invention relates to the field of waste lithium-ion battery. More particularly, the present invention relates to a method for producing titanium dioxide from waste lithium titanate batteries in a commercially feasible manner. The method recovers the titanium with purity of titanium dioxide greater than 98% by following simple physical processes such as shredding, roasting, leaching and precipitation. The method is clean, green and environment friendly.

This invention relates to a method for preparing monodisperse doped titanium dioxide with in-situ lattice strain, belonging to the field of nanomaterial dispersion preparation. The titanium dioxide prepared by this method possesses abundant oxygen vacancies and surface active sites. The method employs a secondary titanium source injection followed by a rapid solvothermal reaction with increasing temperature. Lattice strain is controlled by the difference in lattice contraction rates at the amorphous-crystalline interface, reducing the oxygen vacancy formation energy. Doping with low-valence metal ions further stabilizes the oxygen vacancy structure. Surface modifiers can regulate the particle surface properties to adapt to various solvent systems, facilitating the preparation of highly transparent composite functional materials.

To provide a surface-treated inorganic oxide in which the surface of an inorganic oxide such as an inorganic filler or an inorganic pigment is treated with a specific polymer treating agent, and which exhibits enhanced dispersibility, compatibility, and fillability with respect to various media.SOLUTION: Provided is a surface-treated inorganic oxide that is a treated product in which an inorganic oxide is surface-treated with a polymer treating agent. The polymer treating agent is a polymer whose number-average molecular weight is 6,000 to 30,000, including a constitutional unit (1) derived from a monomer 1 represented by general formula (1), a constitutional unit (2) derived from a monomer 2 such as (meth)acryloyloxypropylmethyldimethoxysilane, and an optional constitutional unit (3) derived from a vinyl monomer. (R1 represents a hydrogen atom or a methyl group. A represents O or NH. X represents an ethylene group or a propylene group. Y represents O, NHCOO, or NHCONH. Each R2 independently represents a hydrogen atom or a methyl group. R3 represents an alkyl group having 1 to 18 carbon atoms.)SELECTED DRAWING: None

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

The invention discloses pure inorganic stimuli-responsive sol as well as a preparation method and application thereof, inorganic sol with stimuli-responsive performance is prepared from an inorganic nano-material with positive electricity, and the technical problem of conversion from one-dimensional inorganic nano-material sol to gel is solved. Compared with a means of providing positive electricity for the one-dimensional inorganic nano material through a modification means, the one-dimensional inorganic nano material carrying the positive electricity only needs cheap inorganic matters in cost, and the convenience and cost of the one-dimensional inorganic nano material carrying the positive electricity have qualitative changes in further processing and practical application; the adjustment of the acting force between one-dimensional inorganic nano materials can be realized without replacing ligands, and the method has extremely high advantages in the aspect of realizing the sol-gel conversion capability of stimulation response. The method disclosed by the invention is relatively low in cost and simple and convenient to operate, and the prepared hydrogel not only has relatively good mechanical properties, but also has relatively good stimulation response capability, is a material capable of realizing comprehensive application, and is wide in application scene.

The invention discloses a preparation method of high-purity titanium dioxide, which is characterized by comprising the following steps: (1) preparing a titanium solution: slowly adding a titanium tetrachloride solution into deionized water to obtain the titanium solution; (2) heat-preservation hydrolysis: adding an acidic dispersant into the titanium liquid obtained in the step (1), stirring and mixing uniformly at room temperature, heating to 80-85 DEG C, preserving heat, and carrying out hydrolysis reaction for 1-2 hours to obtain hydrolysis slurry; (3) obtaining a precursor: cooling, aging, filtering, washing and drying the hydrolyzed slurry obtained in the step (2) to obtain a metatitanic acid precursor; and (4) calcining: calcining the metatitanic acid precursor obtained in the step (3) at 400 DEG C to obtain the high-purity titanium dioxide. According to the preparation method of the high-purity titanium dioxide, provided by the invention, the high-purity (greater than or equal to 99.9%) titanium dioxide is prepared under mild process conditions of low-temperature hydrolysis and low-temperature calcination, the product yield reaches about 90%, and the obtained high-purity titanium dioxide is spherical titanium dioxide with a rutile structure and has good dispersity.

The object of the present invention is to provide an anatase type titanium oxide powder having a large specific surface area and high dispersibility, and a method for producing the same. The titanium oxide powder has a BET specific surface area of ​​300 m2 / g or more and 480 m2 / g or less as measured using a nitrogen adsorption method, an anatase content of the crystal phase of 90% or more as measured using XRD measurement, and a spin-spin relaxation time T2 of 46 ms or more and 103 ms or less as measured by pulse NMR of a 5% by mass suspension prepared in ion-exchanged water.