231 results about "Spray pyrolysis" patented technology

The invention belongs to the technical field of lithium ion battery materials, and discloses a bismuth silicate coated lithium ferric manganese phosphate material, a preparation method thereof and a lithium ion battery. The bismuth silicate coated lithium ferric manganese phosphate material comprises lithium ferric manganese phosphate and a coating layer coating at least part of the surface of the lithium ferric manganese phosphate, and the coating layer is made of bismuth silicate. Carrying out ball-milling mixing on the ferric manganese phosphate material, a lithium source, a carbon source and water to obtain mixed slurry; performing low-temperature spray drying on the mixed slurry to obtain a spray material; and carrying out wet mixing on a silicon source, a bismuth source and the spray material, carrying out high-temperature pyrolysis on the wet-mixed material in a spray pyrolysis furnace, and sintering to obtain the bismuth silicate coated lithium ferric manganese phosphate material. When the bismuth silicate coated lithium ferric manganese phosphate material is used as a positive electrode active material of a lithium ion battery, the high-temperature cycle performance of the battery can be improved while the high discharge capacity of the battery is ensured.

A method of synthesis of single crystal nickel-rich cathode materials can include preparing a precursor solution by dissolving lithium nitrate, nickel nitrate, manganese nitrate, and cobalt nitrate in water, aerosolizing the solution of a) in a stream of air using an ultrasonic sprayer, preheating the resulting droplets, premixing the droplets with methane, decomposing the droplets by passing through a co-flow burner, depositing solid particles on a filter, and calcinating the solid particles in a furnace in oxygen to produce a single crystal cathode material.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention provides a preparation method of a lithium-containing iron phosphate precursor, the lithium-containing iron phosphate precursor and lithium iron phosphate. The method comprises the following steps: mixing waste lithium iron phosphate battery powder with pure water, adding an oxidizing agent and hydrochloric acid for acid leaching, and filtering to obtain an acid leaching solution and acid leaching residues; adding waste lithium iron phosphate battery powder and an oxidizing agent into the pickle liquor to adjust the pH value, so as to obtain a lithium-containing solution; carrying out washing and acid leaching on the acid leaching residues to obtain phosphorus and iron acid leaching liquid containing phosphorus and iron; removing impurities from the ferrophosphorus acid leaching solution to obtain an impurity-removed solution; mixing the lithium-containing solution and the impurity removal solution to obtain a lithium-containing ferrophosphorus solution; and carrying out spray pyrolysis on the lithium-containing ferrophosphorus solution to obtain a lithium-containing iron phosphate precursor. By directly treating the waste battery powder, the step of preparing an intermediate product in a traditional method is avoided, so that the cost is reduced. Meanwhile, by accurately controlling the reaction conditions of each step, the introduction of impurities is reduced to the maximum extent, and the high purity of the final product is ensured.

The invention relates to a metal oxide and application thereof. The metal oxide is of a face-centered cubic structure, the space group is Fd-3m, the lattice constant a of the metal oxide is # imgabs 0 # to # imgabs 1 #, and the tensile residual stress F1 in the metal oxide is 0.105 MPa to 5.51 MPa, or the compressive residual stress F2 in the metal oxide is 1.05 MPa to 8.6 MPa; the metal oxide is prepared by a spray pyrolysis method, and the pyrolysis rate K is 0.361 to 48.611. The metal oxide provided by the invention not only has relatively high crystallinity and stability, but also has high activity, and is beneficial to improving the intercalation of sodium ions or lithium ions when the positive electrode material is prepared, so that the comprehensive electrical property is improved.

The invention provides a high-nickel ternary precursor based on a spray pyrolysis method as well as a preparation method and application thereof, the preparation method comprises the following steps: performing spray pyrolysis on a high-nickel ternary solution, and atomizing the high-nickel ternary solution by adopting supercritical CO2 to obtain the high-nickel ternary precursor based on the spray pyrolysis method; the high-nickel ternary liquid comprises a surface active agent. According to the preparation method, supercritical CO2 replaces air to serve as atomizing gas for spray pyrolysis, the size of atomized liquid drops is reduced by means of the super diffusivity and zero surface tension characteristics of the supercritical CO2, meanwhile, a surfactant is added into a precursor solution, the problems that the liquid drops are thick and large and the particle size distribution is wide in the traditional spray pyrolysis process are solved, and the preparation method is suitable for large-scale industrial production. And the high-nickel ternary precursor oxide particles with uniform particle size are prepared.

The invention relates to the technical field of batteries, and discloses a pre-lithiated positive electrode precursor and a preparation method thereof, a positive electrode material, a positive electrode plate and a battery. The preparation method of the pre-lithiated positive electrode precursor comprises the following steps: preparing a mixed metal salt solution containing a nickel source, a manganese source and an M metal source; carrying out spray pyrolysis treatment on the mixed metal salt solution to obtain a spray pyrolysis precursor; and mixing the spray pyrolysis precursor with a first lithium source, and carrying out first sintering treatment to obtain the pre-lithiated positive electrode precursor. The lithium element is introduced into the core body of the precursor material through pre-lithiation, growth of precursor crystal grains is promoted, the lithium element has high reaction activity, oxidation and rearrangement of metal ions can be promoted, formation of a more compact oxide structure is facilitated, the size of the crystal grains is increased, hollowing is reduced, and the performance of the material is improved. Therefore, the tap density of the spray pyrolysis positive electrode precursor is improved.

The invention belongs to the field of positive electrode materials, and particularly relates to a method for preparing a lithium iron phosphate C composite material by combining double spraying, which comprises the following steps: carrying out spray pyrolysis treatment on slurry of a lithium source, an iron source and a phosphorus source to obtain a transformed activated precursor; wherein the atmosphere in the spray pyrolysis stage is an oxygen-containing atmosphere, and the temperature is 600-900 DEG C; and carrying out composite pulpifying on the transformed and activated precursor and a carbon source, and then carrying out spray drying and heat treatment to prepare the lithium iron phosphate C composite material. The invention also discloses the material prepared by the preparation method and application thereof. The method can be based on a brand new process, anion residues are reduced, and the phase and distribution uniformity of elements are improved, so that the electrochemical performance, especially the low-temperature performance, of the material can be remarkably improved.

The present invention relates to a lithium iron phosphate composite precursor, which comprises an Li3Fe2(PO4)3 component and an Fe2O3 component, wherein the molar ratio of the main elements of the precursor satisfies the equation: Li:Fe:P=(0.95-1.05):(0.95-1):1. The present invention further relates to a preparation method for the lithium iron phosphate composite precursor. The preparation method comprises the following steps: (1) solution preparation, involving: preparing an aqueous raw material solution having an Fe content of 60-210 g / L according to the molar ratio of Li:Fe:P＝(0.95-1.05):(0.95-1):1; and (2) spray pyrolysis, involving: subjecting the aqueous raw material solution to spray pyrolysis in an aerobic environment at 400-800ºC, so as to obtain the lithium iron phosphate composite precursor.

The invention discloses a metal oxide precursor and a preparation method and application thereof. The precursor comprises a nickel element, a manganese element and an element M, and the element M comprises one or more of cobalt and aluminum. The preparation method comprises the steps that a mixed metal salt solution with the total metal ion concentration being 2-5 mol / L is prepared; spraying the mixed metal salt solution into a high-temperature pyrolyzing furnace in an aerial fog form, and carrying out a spray pyrolysis reaction; roasting the spray pyrolysis product for 1-4 hours in an oxygen-containing atmosphere, wherein the roasting temperature is 500-700 DEG C; dispersing the roasted product in an acidic aqueous solution, carrying out hydrothermal reaction at 150-250 DEG C for 1-6 hours, and carrying out filter pressing and washing until the conductivity of filtrate is less than 50 [mu] S / cm; and drying the washed product, and carrying out air jet pulverization to obtain the metal oxide precursor. During application, the metal oxide precursor and a lithium source are mixed and sintered to prepare the ternary positive electrode material. Impurities are removed through low-temperature roasting-acidic hydrothermal combination, the structure is optimized, and the performance of the positive electrode is improved.

The invention discloses a preparation method of a single crystal lithium ion positive electrode material, the positive electrode material and a battery. The preparation method comprises the following steps: dissolving a nickel salt, a cobalt salt, a manganese salt or / and an aluminum salt and an M salt, and mixing to obtain a metal liquid; the molten metal is subjected to spray pyrolysis, and metal oxide is obtained; the method comprises the following steps: crushing and slurrying a metal oxide, adding a lithium salt, grinding, and carrying out spray heat treatment to obtain a lithium-containing precursor; and sintering the lithium-containing precursor at high temperature to obtain the single crystal lithium ion battery positive electrode material. According to the present invention, the lithium and the metal element are mixed at the nanometer level, the lithium diffusion path during sintering is shortened, the single crystal lithium ion positive electrode material obtained after sintering has excellent electrical performance, and the lithium-containing precursor has characteristics of high tap density, large calcining bowl loading amount and low production cost.

The invention discloses a porous-filling type hard carbon material and a preparation method thereof, and relates to the field of battery negative electrode material preparation, resin is dissolved in water, metal salt is added, after dissolving and uniform mixing, spray pyrolysis is carried out to obtain mixture powder, then primary carbonization is carried out, then the mixture powder is washed with dilute nitric acid and dried, and porous hard carbon is obtained; dissolving cane sugar in water, adding the porous hard carbon powder, uniformly mixing, carrying out hydrothermal treatment, drying the turbid liquid, and carrying out secondary carbonization so as to fill pores in the outer layer of the porous hard carbon and increase sodium storage sites; according to the porous-filling type hard carbon material and the preparation method thereof, sucrose filled in pores of the porous hard carbon is pyrolyzed and shrunk through secondary carbonization to leave more pore channels for ion transmission, and the porous characteristic of the porous-filling type hard carbon material is enhanced by increasing ion diffusion channels, so that electrolyte permeation is promoted; the contact area of the electrolyte and the hard carbon material is increased, the rate capability of the material is improved, and the initial coulombic efficiency is enhanced.

The invention provides a process for preparing a urea electrocatalyst through spray pyrolysis and synthesizing urea. The CuAg1Ru1 diatomic urea electrocatalyst prepared by a spray pyrolysis process can simultaneously perform C-N coupling and protonation tandem catalytic reaction of * CO2NH2, Ag1-Cu and Ru1-Cu sites synergistically promote UENC through a tandem catalytic mechanism, the Ag1-Cu site triggers C-N coupling and promotes the step from * CO2NH2 to * CO2NH, the Ru1-Cu site promotes the subsequent protonation step from * CO2NH2 to * COOHNH2, and the CuAg1Ru1 diatomic urea electrocatalyst has the advantages of simple preparation process, low cost and high efficiency. Three active sites of Ag, Ru and Cu exist in the whole catalytic process, the hydrogen evolution competitive reaction is effectively reduced in the reaction process, and the Faraday efficiency and the urea yield are effectively improved. The urea synthesis process provided by the invention is simple and environment-friendly, CO2 in air and NO3 <-> in sewage are used as raw materials in the urea synthesis process, and the national double-carbon policy is effectively met.

A method of synthesis of aluminum-doped Li6.25Al0.25La3Zr2O12 (Al-LLZO) can include preparing a precursor solution by dissolving lithium nitrate, aluminum nitrate, zirconium (IV) oxynitrate, and lanthanum nitrate in stoichiometric amounts according to the composition Li6.25Al0.25La3Zr2O12 in water, and decomposing droplets by passing through a co-flow burner. Also disclosed is a method of produce producing a thin-tape comprising Al-LLZO.

Disclosed are a ferroelectric semiconductor thin film, a method of forming the ferroelectric semiconductor thin film, a transistor, a memory device and an integrated circuit. The method of forming the ferroelectric semiconductor thin film includes preparing a precursor solution including an indium precursor and a selenium precursor, and performing spray pyrolysis of the precursor solution on a substrate to obtain the ferroelectric semiconductor thin film including a polycrystalline γ-In2Se3 layer.

The invention relates to a host material for an electrode of a lithium-sulfur battery and a preparation method of the host material. According to the invention, a template is constructed by using a spray pyrolysis process, and the host material for the electrode of the lithium-sulfur battery is finally obtained, and is element-doped graphdiyne with a hollow multi-shell structure. The graphdiyne with a hollow multi-shell structure is doped by doping agents such as a boron source, a nitrogen source, a phosphorus source and a sulfur source, and due to introduction of doping elements, the graphdiyne material has high catalytic activity, can be used for catalyzing oxidation reduction of sulfur species, is beneficial to adsorption of polysulfide and limits the shuttle effect. Through the synergistic effect of the two, the performance of the lithium-sulfur battery can be further improved, and the comprehensive improvement of the energy density, the cycling stability and the rate capability of the lithium-sulfur battery is realized.

The invention relates to the technical field of precursor battery novel materials, in particular to a spray pyrolysis oxide precursor and a preparation method and application thereof, and the method comprises the following steps: preparing a metal salt solution; adding alcohol into the metal salt solution, and heating; the method comprises the following steps: preparing a metal salt solution with a certain concentration, atomizing the metal salt solution under a certain high-speed carrier gas, feeding atomized fog drops into a furnace body under a certain carrier gas flow, and sequentially reacting through each temperature zone. Alcohol is added while the temperature of the metal salt solution is increased, so that the concentration of the metal salt solution is greatly increased, the evaporation time of atomized liquid drops in the spraying furnace body is shortened, the viscous-viscous and viscous-dry condensation volume ratio of the fog drops is reduced, the output in unit time is increased, the particle wall thickness is increased, product particles are more uniform, and the product quality is improved. The fogdrop hollow forming probability is reduced, and the compaction is improved.

The disclosure relates to the technical field of electrochemical energy storage material preparation, and discloses an asphalt-based hollow activated carbon microsphere and a preparation method thereof, an electrode sheet, and a supercapacitor. The preparation method of the asphalt-based hollow activated carbon microsphere comprises the following steps of: (1) mixing an asphalt of low ash content with a solvent to obtain a mixed asphalt solution; (2) subjecting the mixed asphalt solution to spray pyrolysis in an inert atmosphere to obtain a hollow carbon microsphere; (3) mixing the hollow carbon microsphere with an activating agent, and activating to obtain activated carbon; (4) subjecting the activated carbon to acid pickling and water washing to remove impurities, and drying to obtain the hollow activated carbon microsphere. The method has the features of simple process steps, low preparation cost, being suitable for continuous production and the like. The asphalt-based hollow activated carbon microsphere prepared by the method disclosed herein has a high specific surface area, a stable performance, environmental friendliness and an apparent hollow structure, and the supercapacitor prepared from the microsphere has a high specific capacitance and a high cycling capacity retention rate.

The invention belongs to the technical field of batteries, and discloses a high-nickel oxide positive electrode material with a two-phase symbiotic structure and a preparation method, the unique two-phase symbiotic structure can effectively inhibit the violent change of the unit cell volume in the charging and discharging process, and the mechanical stability of the material is improved; a spinel structure is controllably constructed in advance, so that the reaction activity of the material can be effectively reduced, and the thermodynamic stability is improved, thereby inhibiting uncontrollable interface side reaction, oxygen release and irreversible phase change; due to the nanocrystallized particle morphology, faster lithium ion transmission can be realized, and the rate capability of the material is improved; the one-step spray pyrolysis method has the advantages of simple process, rapid reaction, no need of complex steps of coprecipitation, filtration, washing, crushing, calcination and the like, no generation of wastewater, great improvement of the production efficiency and reduction of the cost.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to an iron-manganese-based sodium-ion battery positive electrode material as well as a preparation method and application thereof. The preparation method of the iron-manganese-based sodium ion battery positive electrode material comprises the following steps: adding ferric nitrate and manganese nitrate into water for dissolving, performing spray pyrolysis to obtain an iron-manganese oxide precursor, performing ball-milling mixing on sodium carbonate, the iron-manganese oxide precursor and lanthanum telluride, and calcining in an inert gas atmosphere to obtain a composite material; and adding Ni4O4 cubic alkane modified carbazole, the composite material and manganese dioxide into dilute sulphuric acid for ultrasonic dispersion, stirring for reaction, centrifuging, washing and drying to obtain the iron-manganese-based sodium ion positive electrode material. The iron-manganese-based sodium ion battery positive electrode material provided by the invention has the advantages of stable rate cycle, high specific capacity and excellent capacity retention rate.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The invention discloses a nano cerium oxide composite proton exchange membrane and a preparation method and application thereof.The preparation method comprises the following steps that after a soluble cerium salt solution is sprayed and atomized, pyrolysis is conducted under the oxidizing atmosphere, and nano cerium oxide particles are prepared; then adding into a perfluorosulfonic acid resin solution, adjusting the pH value to be alkaline, and stirring to prepare a composite resin solution; and casting, drying to form a film, and carrying out heat treatment. Compared with the nano cerium oxide particles prepared by the traditional sol-gel method, the nano cerium oxide particles prepared by the spray pyrolysis method are more easily and uniformly dispersed in the perfluorosulfonic acid resin matrix and are not easy to agglomerate, and the basic structure of the perfluorosulfonic acid is maintained after the film is formed. Meanwhile, nano cerium oxide particles are dispersed in a perfluorosulfonic acid resin solution under an alkaline condition, so that the chemical stability and durability of the composite proton exchange membrane are improved, and the proton conductivity of the composite proton exchange membrane is improved.

The invention provides a preparation method of a ternary precursor, a ternary positive electrode material and a preparation method of the ternary positive electrode material, and the preparation method of the ternary precursor comprises the following steps: uniformly mixing a ternary metal salt solution and a chelating agent, carrying out spray pyrolysis on the obtained mixed solution, and sequentially passing through three temperature zones from top to bottom to obtain the ternary precursor. According to the preparation method disclosed by the invention, the chelating agent is added into the ternary metal salt solution as an additive, and spray pyrolysis sequentially passes through three temperature zones from top to bottom, so that the problem of hollowing or crushing of secondary particles is solved; the preparation of the solid spheroidic secondary particle precursor with narrow particle size distribution by a ternary metal salt system spray pyrolysis method can be realized.

The present invention discloses a sodium ion battery hard carbon material, a preparation method thereof, and a sodium ion battery using the hard carbon material. The hard carbon material is a composite porous material inlaid with hollow porous spheres and porous carbon sheets. Compared with the prior art, the advantages of the present invention are: a method for preparing sodium ion hard carbon materials from concentrated papermaking black liquor in a short process using spray pyrolysis, using spray pyrolysis to construct a precursor material with a hollow porous spherical structure; using an aqueous solution to collect the precursor material, and removing impurities through solid-liquid separation and washing; and then further regulating the microstructure of the carbon material through two-stage heat treatment to obtain a hard carbon negative electrode material with high specific capacity, excellent rate performance, and cycle stability. Using the hard carbon material as the negative electrode, a high-energy-density sodium ion battery is prepared.

This invention relates to a bimodal tungsten-copper alloy and its preparation method. The preparation method includes: using water-soluble tungsten salt, water-soluble copper salt, and coarse tungsten powder with controllable particle size as raw materials, adding a solvent to prepare a suspension; subjecting the suspension to spray pyrolysis and in-situ reduction reaction to obtain tungsten-copper composite powder; and finally pressing the tungsten-copper composite powder into a green blank and sintering it to obtain a tungsten-copper alloy material with bimodal tungsten grain structure. In the tungsten-copper composite powder prepared by this invention, fine tungsten powder and copper powder are coupled to each other and uniformly distributed on the surface of coarse tungsten powder, forming a structure in which fine tungsten-copper composite powder coats coarse tungsten powder. This effectively improves the uniformity of W and Cu element distribution, thereby enhancing the overall properties of the tungsten-copper alloy, such as density, electrical conductivity, and thermal conductivity.

The present disclosure relates to a kind of ferric phosphate and its preparation method and use, the preparation method includes the following steps: (1) mixing ammonium ferrocyanide and phosphorus source, obtain iron-phosphorus mixed solution;(2) the iron-phosphorus mixed solution obtained in step (1) is carried out spray pyrolysis, obtain solid particles;(3) the solid particles obtained in step (2) are broken, obtain ferric phosphate.The ferric phosphate provided by the present disclosure has higher purity, tap density and specific surface area, the preparation method can avoid using pH regulator and surfactant, reduce by-product production and cleaning step, greatly simplify production process, have higher industrial application value.

The application provides a method for preparing an M-phase VO2 film by a light-assisted spray pyrolysis method and the M-phase VO2 film prepared by the method, and belongs to the field of nanometer materials. The method comprises the following steps: (1) preparing a vanadium dioxide spraying liquid: adding vanadium oxyacetonylacetone into anhydrous methanol, stirring and aging to obtain a vanadium dioxide spraying liquid with ultraviolet photosensitive properties; (2) preparing a vanadium dioxide film: introducing the vanadium dioxide spraying liquid in step (1) into an atomizer and spraying onto a substrate coated with a TiO2 anatase phase under ultraviolet light irradiation to obtain the M-phase VO2 film. The method enables vanadium ions to be chelated in the sol by stirring, and the vanadium dioxide spraying liquid has ultraviolet photosensitive properties. The purity of the VO2(M) film is improved by introducing a titanium dioxide transition layer, and the microstructure of the VO2(M) film is improved by ultraviolet light irradiation, thereby improving the visual transmittance and solar light regulation rate of the VO2(M) film.

The present invention relates to coated cerium suboxide particles, to a process for preparing coated cerium oxide or suboxide particles by means of flame spray pyrolysis technology, to the cerium oxide particles resulting from such a process, to compositions comprising such particles and also to the uses thereof.

A preparation method of a surfactant modified lithium-rich manganese-based positive electrode material comprises the following steps: adding acetate of lithium, acetate of nickel, acetate of cobalt and acetate of manganese into deionized water, uniformly mixing to form a metal salt solution, adding a sodium lignin sulfonate surfactant, simultaneously adding a citric acid monohydrate complexing agent, and uniformly stirring to obtain a precursor solution; a precursor salt solution with the sodium lignin sulfonate concentration being 0.3 g / L is obtained; performing spray pyrolysis on the precursor salt solution to prepare precursor powder; and placing the precursor powder in a muffle furnace for high-temperature calcination treatment to obtain modified lithium-rich manganese-based positive electrode material powder. The method has the advantages that the integrity of the material structure is favorably maintained, the stability of the material can be greatly improved, and the improvement of the cycle performance is realized.

The invention relates to a process for producing lithium zirconium mixed oxides by means of flame spray pyrolysis, mixed oxides obtainable by this process and their use in lithium ion batteries.