61 results about "Particle growth" patented technology

The invention discloses a nickel-iron-manganese layered oxide precursor as well as a preparation method and application thereof, and relates to the technical field of sodium-ion battery materials. In a reaction system for preparing the nickel-iron-manganese layered oxide precursor through coprecipitation, the concentration of reducing sulfate is regulated and controlled from particle growth to different stages, so that the quantity of precipitated crystal seeds in a particle size matrix of the whole reaction system can be controlled, and the precipitation rate, the growth unit cell sequence direction and the secondary particle morphology in the growth process can be controlled; a balanced reaction system is maintained, products with the particle size range meeting production index requirements are continuously produced, the particle size distribution uniformity of the products is improved, good sphericity morphology is obtained, and the tap density is improved. The process is relatively simple to control, high in stability and obvious in production cost advantage.

Provided are a cathode active material having a suitable particle size and high uniformity, and a nickel composite hydroxide as a precursor of the cathode active material. When obtaining nickel composite hydroxide by a crystallization reaction, nucleation is performed by controlling a nucleation aqueous solution that includes a metal compound, which includes nickel, and an ammonium ion donor so that the pH value at a standard solution temperature of 25° C. becomes 12.0 to 14.0, after which, particles are grown by controlling a particle growth aqueous solution that includes the formed nuclei so that the pH value at a standard solution temperature of 25° C. becomes 10.5 to 12.0, and so that the pH value is lower than the pH value during nucleation. The crystallization reaction is performed in a non-oxidizing atmosphere at least in a range after the processing time exceeds at least 40% of the total time of the particle growth process from the start of the particle growth process where the oxygen concentration is 1 volume % or less, and with controlling an agitation power requirement per unit volume into a range of 0.5 kW / m3 to 4 kW / m3 at least during the nucleation process.

The utility model discloses a device for preparing a ternary material precursor by intermittently combining discharging and separating kettles, and relates to the technical field of battery production. The device comprises a storage tank, a transfer cavity, a growth kettle and a conveying auger, the bottom end of the storage tank is fixedly communicated with a conveying pipe, the bottom end of the conveying pipe is fixedly communicated with a conveying pump, the bottom end of the conveying pump is fixedly communicated with a bottom pipe, the bottom end of the bottom pipe is fixedly communicated with the transfer cavity, and the periphery of the transfer cavity is fixedly communicated with six fixing pipes in an annular array mode. The ends, away from the transfer cavity, of the six fixing pipes fixedly communicate with growth kettles, the ends, away from the growth kettles, of the three-way pipes fixedly communicate with material conveying augers, and a weighing platform is arranged below each growth kettle. According to the device, the storage tank, the transfer cavity, the growth kettle and the conveying auger are arranged, so that the problems that when a plurality of reaction kettles are used together, the growth of particles is not uniform enough, and the mixing sufficiency of seed crystals and a growing solution is not good enough are solved.

The invention provides a positive electrode material precursor and a preparation method and application thereof. The preparation method comprises the following steps: a first stage: introducing a ternary metal salt solution, a complexing agent and a precipitator into a first reaction kettle, and carrying out nucleation growth to obtain a core solution; in the second stage, the core solution is transferred into a second reaction kettle, and a ternary metal salt solution, a complexing agent and a precipitator are introduced for a growth reaction until the particles grow to the target particle size in the second stage; and a third stage: keeping the introduction of each raw material solution in the second stage, and introducing the doped metal salt solution to continue the growth reaction until the growth particle size of the particles reaches the target particle size in the third stage, thereby obtaining the positive electrode material precursor. According to the invention, a reaction container transfer means is utilized, so that the doping elements are intensively doped into the shell layer of the particles in the coprecipitation process, the maximized doping effect is realized in the most efficient mode and at the lowest cost, and the electrochemical performance of the positive electrode material is remarkably improved.

The invention provides a traceable calibration device and a traceable calibration method for a mobile source emission particulate matter quantity analyzer, and relates to the technical field of particulate matter quantity analyzers. A particle generation system in the device is used for aerosol samples of different types, an electromagnetic valve system is used for controlling the aerosol samples to quantitatively enter a particle growth system, and the particle growth system is used for carrying out charge grading on the aerosol samples of different types. An aerosol sample with two charge particles, an aerosol sample with three charge particles and a monodisperse aerosol sample are obtained, the growth speed of the monodisperse aerosol sample is controlled through the temperature, a grown particle sample is obtained, and the particle measurement system is used for measuring the grown particle sample. The output current and the particle number and concentration are obtained. According to the invention, the problem of low calibration accuracy of the mobile source emission particle quantity measuring instrument in the prior art is solved.

The invention discloses a rotary kiln multi-physical phenomenon numerical simulation method based on artificial intelligence reasoning, and relates to the technical field of rotary kiln multi-physical phenomenon simulation. On the basis of an Euler multiphase flow equation, a heat transfer model, a chemical kinetic reaction model, a particle growth model, a chemical reaction model and the like are added; establishing a three-dimensional numerical model capable of accurately simulating multiple physical and chemical phenomena such as gas-solid two-phase flow movement, combustion, NOx generation, clinker calcination and particle growth in the rotary kiln; a long-short-term memory neural network is introduced to build an AI model, the AI model is used for predicting the working condition of the second half section of the model, the simulation speed is increased, and long-time simulation of the rotary kiln is achieved.

A method for controlling particle growth in a processing chamber is disclosed herein. The method includes performing at least one plasma deposition process in a chamber using a precursor to form a layer on a substrate. The method also includes providing power to the chamber during the at least one plasma deposition process, and monitoring at least one criterion to determine when at least one plasma purge is to be performed. The method further includes performing at least one plasma purge by applying a gas into the chamber in response to at least one criterion indicating that the at least one plasma purge is to be performed.

The invention belongs to the technical field of battery material preparation, discloses a preparation method of manganous-manganic oxide with controllable tap density, and aims to solve the problem that a manganous-manganic oxide preparation process in the prior art is difficult to effectively control the tap density of a product, and provides a preparation method of manganous-manganic oxide with controllable tap density based on deep research on growth characteristics of manganous-manganic oxide crystal particles. By optimizing process parameters and regulating and controlling behaviors of the particles in different growth stages, accurate prediction and accurate control of the tap density of the product are successfully realized. On the basis, the process conditions are further optimized, the controllability of the tap density of the product is ensured, the high-tap-density manganous-manganic oxide material is successfully prepared, and important guidance and practical reference are provided for controllable synthesis of battery-grade manganous-manganic oxide. In addition, according to the technology, the preparation process is simplified, the operation difficulty and energy consumption are reduced, and the obvious industrial application potential and industrialization value are achieved.

The application provides a lithium titanium aluminum phosphate and a preparation method and application thereof, and belongs to the field of solid-state batteries, wherein the preparation method of the lithium titanium aluminum phosphate comprises the following steps: adding a titanium source, a lithium source, an aluminum source and a phosphorus source into a solvent to obtain a mixed solution; the mixed solution is heated to a first preset temperature, an oxidizing agent is added, then the temperature is increased to a second preset temperature, and an initial product is obtained through reaction; the initial product is sequentially subjected to filtration, washing and drying treatment to obtain an intermediate product; the intermediate product is mixed with an auxiliary agent, and calcination treatment is performed to obtain the lithium titanium aluminum phosphate. Through optimization of raw material ratio and treatment process, the application utilizes oxidation of the oxidizing agent and hydrolysis of the titanium source to generate high-activity titanium hydroxide colloid, promotes phase conversion and formation of crystal nucleus of the lithium titanium aluminum phosphate, and can effectively control primary particle size and morphology. Through introduction of the auxiliary agent, the application prevents particle growth and fusion during the calcination process, improves the crystallinity of the lithium titanium aluminum phosphate, reduces particle size, and improves ion conductivity.

A variable-diameter assembly device and implementation method for a plasma evaporation chamber includes a chamber wall, a variable-diameter inner liner, a variable-diameter guide rail, and thermocouples. The reaction chamber is an integral DC arc plasma evaporation chamber. The anode copper seat within the reaction chamber is located at the center of the bottom surface of the variable-diameter inner liner. The cathode is moved up and down by a lifting rod. A crucible is placed on the anode copper seat, and plasma is formed between the cathode and the anode material. The variable-diameter inner liner has an arc-shaped vertical cylindrical structure. Each inner liner plate can move along the variable-diameter guide rail, thereby adjusting the radius of the inner liner and controlling the particle size and distribution. Thermocouples are used to detect the temperature distribution within the space formed by the variable-diameter inner liner. This invention, through the design and implementation of a variable-diameter inner liner inside the evaporation chamber, can effectively change the particle growth space and control the particle size and distribution by adjusting the temperature gradient field. Without changing the overall size of the chamber, the size of key areas inside the chamber can be significantly adjusted, achieving control over the quality of the particulate product, improving energy utilization, and reducing preparation costs.

The invention discloses a hollow positive electrode material precursor with an adjustable inner hole size. The chemical formula of the precursor is Ni < x > Co < y > Mn < z > (OH) < 2 >. The preparation method comprises the following steps: firstly, preparing a nickel-cobalt-manganese mixed salt solution, a precipitator, a complexing agent and a reaction kettle base solution; stirring is started, oxygen and nitrogen mixed gas is introduced, and then the mixed salt solution, the precipitator and the complexing agent are added into the base solution in a parallel flow mode for rapid nucleation. In the stage, the pH is controlled to be 12.00-12.40, the temperature is 45-70 DEG C, the ammonia concentration is 0.2-0.5 mol / L, and the nucleation duration accounts for 1-8% of the total duration. After nucleation, the pH value of the system is reduced to 11.3-12.0, feeding is continued for particle growth, and the atmosphere is switched into non-oxidizing gas. Increasing the flow of the mixed salt solution at the later growth stage until the reaction reaches the target particle size. Separating, aging, washing and drying the product to obtain a hollow precursor; the method is simple in process, low in cost, easy to scale and wide in industrialization prospect.

The application discloses a rotary kiln multi-physical phenomenon numerical simulation method based on artificial intelligence reasoning, relates to the technical field of rotary kiln multi-physical phenomenon simulation, and is based on the Euler multiphase flow equation, adds a heat transfer model, a chemical dynamics reaction model, a particle growth model, a chemical reaction model and the like, establishes a three-dimensional numerical model capable of accurately simulating the multi-physical and chemical phenomena such as the gas-solid two-phase flow movement, combustion, NOx generation, clinker calcination and particle growth in the rotary kiln, introduces a long short-term memory neural network to build an AI model, uses the AI model to predict the latter half of the working condition, accelerates the simulation speed, and realizes long-time simulation of the rotary kiln.

A traceable calibration device of particle number (PN) analyzers for vehicle emission includes a particle generation system, used for generating different types of aerosol samples; a solenoid valve system, used for controlling various aerosol samples to quantitatively enter the particle growth system; a particle growth system, used for performing charge classification to obtain doubly-charged-particle aerosol samples, triply-charged-particle aerosol samples and monodisperse aerosol samples, and obtaining grown particle samples by controlling the growth speed of the monodisperse aerosol samples through temperature adjustment; and a particle measurement system, used for measuring electrical current and PN concentration of the grown particle samples. In the present disclosure, the problem of low calibration accuracy of a PN analyzer for vehicle emission in the related art is solved.

To provide a single-crystal type positive electrode active material which can exhibit relatively high battery performance and can have a uniform particle size distribution by inducing uniform particle growth even without any harsh calcination condition or disintegration process and by reducing inter-particle agglomeration.SOLUTION: A positive electrode active material comprises a lithium composite oxide capable of intercalation / deintercalation of lithium, where the lithium composite oxide includes at least lithium and transition metal and has D10, D50, D90 and Dmax satisfying all of Formulas 1 to 3 in the following: D90 / D10≤3.62 [Formula 1]; Dmax-D90<2.0 μm [Formula 2]; and Dmax / Dmin<5.19 [Formula 3].SELECTED DRAWING: Figure 1

The invention provides a high-crystallinity hollow positive electrode precursor and a preparation method and application thereof. The method comprises the following steps: a ternary transition metal mixed salt solution, a precipitant solution and a complexing agent solution are introduced into a base solution in a parallel flow manner, a co-precipitation reaction is performed, feeding is stopped when particles subjected to the co-precipitation reaction grow to target particle sizes, and the high-crystallinity hollow positive electrode precursor is obtained, wherein the co-precipitation reaction comprises a nucleation stage and a growth stage, the feeding speed of a precipitant solution in the nucleation stage is smaller than the feeding speed of the precipitant solution in the growth stage, and the feeding speed of the precipitant solution in the co-precipitation reaction is smaller than 10 L / h. The ternary positive electrode material prepared from the high-crystallinity hollow positive electrode precursor provided by the invention has high capacity and also has good structural stability and cycling stability.

The application discloses a kind of based on MOF composite material lubricating oil dispersant and preparation method thereof, belong to lubricating oil additive technical field, by the following component according to mass percentage composition: MOF composite material 8%—18%, modified carrier 45%—65%, functional adjuvant 8%—22%, the balance is base oil, using amino grafting modified carbon nanotube in situ growth amino modified UIO-66 MOF forms MOF composite material, through the design of "tube-crystal" interlocking structure, effectively solve the technical problems of single MOF easy to agglomerate, poor dispersion stability;Amino grafting modified carbon nanotube not only provides specific binding site for MOF in situ growth, its tubular structure can also play a space limiting effect on MOF, avoid MOF particle growth agglomeration.

To provide a single-crystal type positive electrode active material which can have a uniform particle size distribution by inducing uniform particle growth without harsh calcination conditions and a disintegration process and reducing inter-particle agglomeration and can exhibit relatively high battery performance.SOLUTION: A positive electrode active material includes a lithium composite oxide capable of intercalation / deintercalation of lithium. The lithium composite oxide includes at least lithium and a transition metal. The lithium composite oxide satisfies the following equations 1 and 2 in which D10, D50, D90 and Dmax represent a particle size that is 10% of the volume accumulation amount, a particle size that is 50% of the volume accumulation amount, a particle size that is 90% of the volume accumulation amount, and the maximum particle size, respectively, in the volume cumulative particle size distribution graph obtained by laser diffraction particle size distribution measurement. [Equation 1] Dmax≤15 μm [Equation 2] D90-D50>D50-D10SELECTED DRAWING: Figure 1

The invention discloses an X-ray CT-based hydrate particle growth experimental device and experimental method.The X-ray CT-based hydrate particle growth experimental device comprises a reaction kettle, an X-ray CT, a temperature regulation and control assembly and a gas conveying and pressure regulating assembly, a sample column is detachably installed in the reaction kettle and used for containing a sample, and the temperature regulation and control assembly is arranged to be capable of regulating and controlling the temperature in the reaction kettle; the X-ray CT is arranged to be capable of scanning a sample placed on a sample column in the reaction kettle, and the gas conveying and pressure regulating assembly is arranged to be capable of conveying gas required by an experiment into the reaction kettle or extracting the gas in the reaction kettle for pressure regulation; according to the experimental device designed by the invention, the hydrate grows under the condition that the hydrate on the surface of the ice particle is completely decomposed and undecomposed residual hydrate is reserved, and some residual hydrate is reserved as seed crystals to induce the growth of the hydrate on the surface of a water drop in the process; the growth of hydrate particles can be effectively promoted, the experiment efficiency is remarkably improved, and the total time cost of the experiment is reduced.

The invention provides non-spherical colloidal silicon dioxide as well as a preparation method and application thereof, and belongs to the technical field of polishing solutions. The preparation method comprises the following steps: firstly, uniformly dispersing a seed crystal silicon dioxide solution in ultrapure water, adding organic acid to adjust the pH value of the solution to be acidic to obtain a mixed solution A, heating the mixed solution A to a preset temperature, and curing for a certain time to finally form preliminarily-shaped colloidal silicon dioxide small particles; and then dropwise adding alkyl silicate at a constant speed until the particles grow to a target particle size, and heating and concentrating to remove alcohol to obtain the non-spherical colloidal silicon dioxide. The colloidal silicon dioxide prepared by the method is high in non-sphericity degree and good in stability and dispersity and can be used as grinding particles of a CMP polishing solution, and the method is easy to operate, low in cost and suitable for large-scale production.

A method for producing a metal composite hydroxide, which includes a first crystallization process of supplying a first raw material aqueous and performing a crystallization reaction and a second crystallization process of supplying a second raw material aqueous solution containing a more amount of tungsten than the first raw material aqueous solution and performing a crystallization reaction to form a tungsten-concentrated layer and in which switching of reaction atmosphere from either atmosphere of a non-oxidizing atmosphere or an oxidizing atmosphere to the other atmosphere is performed two or more times in particle growth and the time for supplying the second raw material aqueous solution into the reaction tank in the non-oxidizing atmosphere is 50% or more with respect to the entire time for supplying the second raw material aqueous solution into the reaction tank.

This invention relates to a composition comprising a compound of formula (I) and an agrochemical active ingredient selected from ADEPIDYN™ (pydiflumetofen), oxathiapiprolin, sedaxane and azoxystrobin; R1O[C(R2)(H)C(R3)(H)O]nX (I), where R1 is C6-12 alkyl or is C6-12 alkenyl; n is from 5 to 50; independently, each [C(R2)(H)C(R3)(H)O] unit has both R2 and R3 being hydrogen or has one of R2 and R3 being hydrogen and the other being phenyl; provided that at least one [C(R2)(H)C(R3)(H)O] unit has one of R2 and R3 being hydrogen and the other being phenyl; and X is hydrogen or is selected from C1-4 alkyl; and to use of a compound of formula (I) to reduce particle growth (such as nucleation, crystal growth or Ostwald ripening) of an agrochemical active ingredient.

A mechanochemical process to synthesize single-crystalline cathode powders for the formation of cathodes in a lithium-ion battery includes mixing a transient metal oxide precursor with a lithium salt mixture. Thereafter, a mechanical agitation process may be applied to selectively melt the lithium salt mixture to form a molten salt liquid that wets, corrodes, and separates the grain boundaries of secondary particles in the transient metal oxide precursor. As a result, the secondary particles are deagglomerated resulting in a colloidal dispersion of primary particles. The mixture is then calcined to facilitate growth of single-crystalline particles from the primary particles, thus forming a single-crystalline cathode powder. The single-crystalline particles exhibit large particle size and little to no phase separation, thus improving electrochemical performance. This highly scalable process can be used to synthesize single-crystalline cathode powders from chemical-grade precursors or black mass.

This application belongs to the field of alloy preparation technology, and particularly relates to methods, ultrasonic devices, and water-cooled molds for controlling the size and uniformity of Al3Sc. Existing technologies mostly employ single process methods, such as stirring or water-cooled molds alone, which are insufficient to simultaneously achieve Al3Sc size refinement and improved distribution uniformity. This solution organically combines refining and degassing, ultrasonic treatment, stirring, and rapid solidification casting. Ultrasonic treatment breaks down nascent Al3Sc particles to achieve size refinement; stirring achieves uniform dispersion; and rapid solidification casting inhibits particle growth, forming a complete process chain from crushing to dispersion to fixation, overcoming the limitations of single process methods.

The application discloses a nickel-iron-manganese layered oxide precursor and a preparation method and application thereof, and relates to the technical field of sodium ion battery materials.The application can control the number of precipitated crystal seeds in the particle size matrix of the whole reaction system, control the precipitation rate, the growth cell sequence direction and the secondary particle morphology, maintain a balanced reaction system, continuously output products with a particle size range meeting the production index requirements, improve the uniformity of the product particle size distribution, obtain a good sphericity morphology, and improve the tap density by adjusting the concentration of a reducing sulfate salt at different stages of particle growth in a reaction system for preparing a nickel-iron-manganese layered oxide precursor by coprecipitation. The process control is relatively simple, the stability is high, and the production cost advantage is obvious.

The invention relates to a granulation method used to produce a granulate (11) consisting of a plurality of granulate particles (12). During execution of the granulation method, a granulation process involving particle growth is carried out in a process chamber (4) of a process container (3), said chamber being delimited by a container wall (5), and is monitored using an electrically controllable image-capturing unit (42). During this monitoring process, two-dimensional images of the granulate (11) are captured using the image-capturing unit (42), are subsequently evaluated by means of an electronic control device (36), and, after being evaluated, are used to define variable operating parameters that influence the operating state of the granulation process. It is essential that the images are captured as inline image captures during the ongoing granulation process of the granulate (11) undergoing particle growth in the process chamber (4).

This invention discloses an automated control system for a granulator based on real-time particle size feedback. The system includes: real-time acquisition of particle size distribution statistics at different times during the granulation process; calculation of indicators such as particle size change trend and relative growth rate; and accurate determination of each growth stage of granulation by combining the spraying state and inlet air temperature, achieving real-time perception and accurate identification of particle growth status. This invention calculates particle size distribution width and exceedance only during the aggregation / layering growth stage, obtaining a control necessity index through a sigmoid function, and precisely triggering control based on a threshold, avoiding meaningless adjustments. When control is required, the system uses the particle size change trend and D50(t) as core inputs, and dynamically adjusts the binder spraying rate based on the MPC algorithm predicted by DMD, achieving a fine match between process parameters and the granulation process response, effectively improving the problem of excessively wide particle size distribution and enhancing particle uniformity.

Various embodiments relate to forming particles using undercooled metal particles in response to focused low power laser light. Particle growth can be initiated by utilizing the metastable and liquid nature of the particles, allowing for surface instability promoted by the laser light to induce liquid flow to translate to a neighboring particle. This event can cascade radially leading to accumulation of the liquid metal at the epicenter. The grown solidified particle size can be varied by using different power, exposure time, or working distance. Once the liquid has accumulated into a single region, it eventually solidifies either through homogeneous or heterogeneous nucleation to give a solid particle of larger size than the original. Such a method can be used to print patterns on a surface in four dimensions, where the fourth dimension (4D) is attained through gradient in size of the particles made. Additional systems and methods are disclosed.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-mechanical-strength ternary positive electrode material and a preparation method and application thereof. Compared with the prior art, the preparation method has the advantages that particle growth and particle mechanical strength are regulated and controlled through element doping types and doping amounts, so that when the material is subjected to external rolling or internal stress, the integrity of the particles can still be kept, the risk of particle breakage is reduced, and thus the capacity attenuation, the cycle retention rate and the cycle DCR growth rate of the positive electrode material are improved.

A granulation process is proposed for producing granules (11) consisting of a multitude of granule particles (12). During the granulation process, a granulation process involving particle growth is carried out in a process chamber (4) of a process vessel (3) bounded by a vessel wall (5) and monitored using an electrically controlled image acquisition unit (42). During this monitoring, two-dimensional images of the granules (11) are taken with the image acquisition unit (42). These images are then evaluated by an electronic control unit (36) and, after evaluation, used to specify variable operating parameters that influence the operating state of the granulation process.It is essential that the images are taken as inline images during the ongoing granulation process of the granules (11) in the process chamber (4) undergoing particle growth.

The invention provides a method and a system for predicting particle size distribution of a sintered mixture after granulation. According to the method, raw materials are divided into fine particles smaller than a preset threshold value and coarse particles larger than the threshold value; when the total weight percentage of the fine particles meets a preset condition, the method calculates the growth volume ratio of the particles based on the particle size distribution and proportion of the raw materials and a group of physical parameters including apparent density, bulk density and fine particle adhesion ratio. And finally, predicting the target particle size of the coarse particles based on the V%, and determining the final particle size distribution in combination with the amount of the non-adhered fine particles. According to the method, key parameters such as the adhesion ratio reflecting the internal balling performance of the raw materials are introduced, a simple and accurate prediction model is constructed, prospective regulation and control of the granulation granularity can be achieved in the batching stage without complex data training, and the method has important industrial application value.