16results about How to "Avoid overgrowth" patented technology

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

The application discloses a kind of hard carbon negative electrode material and preparation method thereof based on waste lithium battery diaphragm preparation.The hard carbon negative electrode material is prepared by using waste lithium ion battery PP / PE diaphragm as raw material, through raw material pretreatment, composite sulfonation pre-crosslinking, transient joule heat pulse carbonization, pickling purification step, its first charge specific capacity is greater than or equal to 310 mAh / g, first coulomb efficiency is greater than or equal to 90%, 1A / g cycle 500 cycles capacity retention rate is greater than or equal to 90%, and the performance is excellent.The application is coupled by composite sulfonation pre-crosslinking and transient joule heat rapid carbonization, compared with traditional process, energy consumption is reduced, and waste diaphragm is efficiently converted to high-performance hard carbon.

This invention discloses an organocobalt salt for improving the tensile strength of rubber and its preparation method, belonging to the field of rubber technology. The organocobalt salt for improving the tensile strength of rubber comprises, by mass parts, 140-210 parts of organosilicon vegetable fatty acid, 20-30 parts of solvent, 20-30 parts of cobalt hydroxide, and 10-16 parts of propionic acid. The organosilicon vegetable fatty acid is obtained by reacting rosin with organosilicon maleimide. The organosilicon maleimide is obtained by reacting maleic anhydride with a silicon-containing long-chain fatty amine. The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine. The organocobalt salt obtained by this invention has a good effect on promoting the adhesion between metal and rubber while effectively improving the tensile strength of rubber.

This invention discloses a method for preparing a graphene / silicon-carbon composite anode material. The method includes: firstly, preparing a carbon-coated silicon dioxide precursor via a hydrothermal reaction; then, converting it into a carbon-coated silicon material using a magnesothermic reduction method in the presence of sodium chloride, effectively inhibiting the aggregation and growth of silicon particles; finally, combining graphene with the carbon-coated silicon material through a secondary hydrothermal and calcination treatment to construct a conductive network. This invention, through a multi-level structural design, utilizes the synergistic buffering effect of the internal carbon layer and the external graphene to effectively alleviate the volume expansion of silicon during charging and discharging, significantly improving the conductivity and structural stability of the material. The prepared composite anode material exhibits high specific capacity and excellent cycle performance, making it suitable for lithium-ion battery applications.

This invention belongs to the field of composite material technology, specifically relating to a method for preparing a high-strength, high-plasticity, and high-toughness multilayer titanium-aluminum composite plate. The steps of this invention include: first, preparing aluminum and titanium plates as raw materials; then, after surface treatment of the raw materials, combining and fixing them; after heat preservation, rolling the fixed plates; and finally, performing solution aging treatment to obtain a multilayer titanium-aluminum composite plate. Through alternating layer design, a three-layer (aluminum-titanium-aluminum), three-layer (titanium-aluminum-titanium), or five-layer (titanium-aluminum-titanium-aluminum-titanium) composite structure is constructed. With a simple preparation process, this invention achieves a significant improvement in plasticity and toughness. This invention provides a low-cost, simple, and mass-producible high-performance composite plate preparation scheme, offering a new material option for lightweight design in aerospace, transportation, and other fields.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

The invention relates to the technical field of battery materials, in particular to a preparation method of an alpha-zirconium phosphate coated ternary positive electrode material, which comprises the following steps: S1, dissolving and mixing a zirconium source and a phosphorus source, and then introducing into preparation equipment for gelation reaction to obtain a precursor; wherein the preparation equipment detects the viscosity change of reactants in the gelation reaction process in real time, the gelation reaction process is divided into different stages according to the viscosity change, and the corresponding stirring speed and temperature are adjusted according to the different stages; s2, outputting the precursor obtained in S1 from preparation equipment, washing and drying, and calcining at high temperature for 2-6 hours to obtain the alpha-zirconium phosphate nanosheet; and S3, mixing and ball-milling the alpha-zirconium phosphate nanosheet and the ternary positive electrode material in an ethanol medium, and drying to obtain the alpha-zirconium phosphate coated ternary positive electrode material. According to the preparation method of the alpha-zirconium phosphate coated ternary positive electrode material, provided by the invention, the alpha-zirconium phosphate coated ternary positive electrode material can be simply and quickly obtained, and the preparation method has a good application value.

The invention relates to the technical field of silicon microrods, in particular to a preparation method of a novel synthetic silicon dioxide microrod. According to the technical scheme, the preparation method of the novel synthetic silicon dioxide microrod comprises the following steps: step 1, carrying out surface modification on a carbon nanotube template to enable the surface of the carbon nanotube template to be rich in oxygen-containing functional groups; 2, dispersing the surface-modified carbon nanotube template in a solution containing a surfactant and a silicon source, and carrying out a coating reaction of a silicon dioxide layer to form a core-shell structure; and step 3, removing the internal carbon nanotube template through calcination to obtain a silicon dioxide microrod, and carrying out enhanced ultrasonic acidizing treatment on the carbon nanotube at 80 DEG C for 2 hours by adopting a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid in a specific volume ratio, so that the density and the distribution uniformity of carboxyl and hydroxyl functional groups on the surface of the carbon nanotube are remarkably improved, and the carbon nanotube is prepared. And the problems of coating layer defects and surface roughness caused by insufficient surface modification in the traditional method are effectively overcome.

This invention discloses a method for preparing cubic nano-calcium carbonate based on monosaccharide regulation. Using monosaccharides as crystal guiding agents, the resulting cubic nano-calcium carbonate exhibits a cubic structure with an average particle size of 81-115 nm. The monosaccharide is either glucose or fructose. The preparation method includes the following steps: 1. Preparation of calcium oxide; 2. Preparation of monosaccharide-nano-calcium carbonate. The amount of monosaccharide added is 0.8-1.2 wt.% of the calcium oxide mass; the calcium oxide yield is 65-75%. The resulting nano-calcium carbonate has a whiteness value of 90.6-97.3 wb and an oil absorption value of 65.3-89.6 g DOP / 100 g CaCO3.

The utility model discloses a modularization's landscape ecological floating island combination structure, including connecting main body frame, the connecting main body frame bottom middle part is equipped with counterbore, the side of connecting main body frame all symmetry fixedly connected with the plug -in rod, the connecting main body frame bottom fixedly connected with water supply subassembly and aeration subassembly, the side of plug -in rod all through plug -in rod swing joint has the planting frame, the planting frame top middle part all are equipped with mounting hole, the one side of planting frame close to connecting main body frame all are equipped with with the plug -in slot of matching of plug -in rod, the plug -in rod can insert plug -in slot inside, the planting frame top all are equipped with limit slot, the inside of planting frame all swing joint has planting subassembly and purification subassembly, the planting subassembly side bottom fixedly connected with positioning assembly. This structure realizes the modularization combination of assembly, adjusts the main frame according to the applicable scene, improves water quality through the synergies of plant and biological membrane and realizes floating island plant landscape effect.

The invention relates to the technical field of ceramic capacitors, in particular to a lead-free high-voltage pulse-resistant energy storage multilayer ceramic capacitor and a preparation method thereof. The method comprises the steps that ceramic powder, a solvent, a dispersing agent, a plasticizer and a silicon-based defoaming agent are subjected to ball milling to obtain slurry, and the lead-free high-voltage-pulse-resistant energy storage multilayer ceramic capacitor is obtained through the processes of tape casting, screen printing, lamination, lamination, cutting, glue discharging, sintering, chamfering, end sealing, end burning and electroplating in sequence. The thickness of the film is 25-40 [mu] m; 70 Ag-30 Pd, 60 Ag-40 Pd or 90 Ag-10 Pd electrode slurry is used as an inner electrode material, and drying is carried out at the temperature of 65-75 DEG C after printing; the soft pressing temperature is 60-80 DEG C, the soft pressing pressure is 12-15 MPa, and the pressure holding time is 15-18 s; the lamination pressure is 40 MPa to 55 MPa, and the pressure maintaining time is 10 min to 30 min; the glue discharging temperature is 265-325 DEG C, and the temperature is kept for 7-11 hours; the sintering temperature is 1050-1200 DEG C, and the sintering time is 2-4 hours; in the electroplating process, the nickel plating current ranges from 19 A to 21 A, and the time ranges from 90 min to 120 min; the tin plating current is 13A-15A, and the time is 90 minutes to 120 minutes.

The invention belongs to the technical field of preparation of positive electrode materials, and particularly relates to a high-rate sodium vanadium phosphate positive electrode material, a preparation method thereof and a battery. The method comprises the following steps: S1, dissolving ammonium metavanadate and oxalic acid in water to form a solution A; s2, performing ultrasonic dispersion on CNT in absolute ethyl alcohol to obtain a dispersion B; s3, slowly dropwise adding the dispersion B into the solution A until a stable transparent blue solution C is formed; s4, sequentially introducing sodium dihydrogen phosphate and thioacetamide into the solution C, and stirring to form viscous gel; and S5, carrying out vacuum drying on the viscous gel to obtain a precursor, then carrying out high-temperature heat treatment on the precursor under the protection of a nitrogen atmosphere, and finally putting a product subjected to high-temperature heat treatment in a liquid nitrogen atmosphere for rapid cooling to obtain the high-rate sodium vanadium phosphate positive electrode material. The material has relatively low resistance and relatively large sodium ion diffusion coefficient, so that the reversible specific capacity is highest, and the rate capability is best.

The application discloses a kind of gypsum-based fire-retardant board preparation process heat stability optimization method, comprising the following steps: step one: preparation heat stable type modified gypsum powder, step two: preparation interface compatible type compound flame retardant, step three: preparation homogeneous dispersion type gelling slurry, step four: using gradient compaction layering forming process preparation blank, step five: implementation crystal type control type curing process, step six: after low temperature heat baking later modification treatment;The inorganic-organic composite wet modification that the gypsum matrix is carried out in the application can optimize the growth structure of gypsum crystal, make crystal arrangement more dense, effectively slow down the dehydration rate and crystal form conversion speed of gypsum matrix at high temperature, fundamentally improve the thermal stability of matrix itself.

This invention relates to the field of graphene composite materials technology, and more particularly to a heated de-icing graphene glass fiber cloth and its preparation method. The heated de-icing graphene glass fiber cloth involves treating glass fibers with low-temperature plasma; depositing graphene on the surface of the plasma-treated glass fibers in a first mixed gas via chemical vapor deposition; then treating with water vapor at 700-800℃ to obtain graphene glass fibers; weaving the graphene glass fibers to obtain a fiber fabric; and depositing graphene on the surface of the fiber fabric in a second mixed gas via chemical vapor deposition to obtain the graphene glass fiber cloth. The fiber cloth obtained by this invention not only has a significantly reduced density and lighter weight per unit area, but also a high electrothermal heating rate and effectively improved electrothermal conversion efficiency, achieving a balance between flexibility, electrothermal stability, and mechanical strength in the graphene glass fiber cloth.

The invention discloses a carbon cloth-based composite material, a preparation method and application in a supercapacitor, and belongs to the technical field of supercapacitor electrode materials, and the method comprises the following steps: dissolving nickel nitrate hexahydrate, copper nitrate pentahydrate and an organic ligand containing carboxyl and amino in N-methyl pyrrolidone, adjusting the pH value to 6.07.0, and stirring to form a uniform mixed solution; the preparation method comprises the following steps: carrying out ultrasonic and microwave synergistic activation on pretreated carbon cloth, immersing the carbon cloth in a mixed solution for gradient heating solvothermal reaction to obtain a flexible Ni-Cu bimetal MOF / carbon cloth composite material, immersing the flexible Ni-Cu bimetal MOF / carbon cloth composite material in a composite vulcanizing agent solution prepared from thioacetamide and potassium sulfide, and sequentially carrying out segmented water bath vulcanization and gradient calcination treatment to obtain the flexible Ni-Cu bimetal MOF / carbon cloth composite material. The carbon cloth-based composite material is obtained. The flexible core-shell porous sulfide / carbon cloth composite material with high specific surface area, high specific capacitance, excellent cycle stability and low internal resistance is prepared, the process is mild, the solvent can be recycled, and the composite material has good industrial economy and environmental friendliness.

The application relates to a negative electrode sheet and application thereof, and the negative electrode sheet comprises a negative electrode current collector, a composite active layer located on at least one side of the negative electrode current collector, a protective film located on the side of the composite active layer away from the negative electrode current collector, and a passivation layer located between the negative electrode current collector and the composite active layer; the composite active layer comprises a three-dimensional skeleton with holes and a liquid alloy filled in part of the holes of the three-dimensional skeleton; the three-dimensional skeleton has a resilience rate of greater than or equal to 80%, and an average pore size of 100-200 nm; the liquid alloy has a melting point of less than or equal to 25 DEG C; the protective film comprises zero-dimensional nanocarbon materials and lithium diffusion materials; and the initial density of the protective film is greater than or equal to 85%. The negative electrode sheet has low volume expansion, the corrosion degree of the negative electrode current collector is low, and the creep of the material can be controlled to be Coble creep controlled by grain boundary diffusion, so that the cycle performance and safety of a corresponding solid-state battery are comprehensively improved.