49 results about "Particle growth" patented technology

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 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.

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.

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 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.

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.

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.

The invention relates to the technical field of battery materials, and discloses a high-nickel ternary precursor, a preparation method thereof, a positive electrode material and a battery. The preparation method of the high-nickel ternary precursor comprises the following steps: crystal nucleus growth: injecting a mixed metal salt solution, a precipitator and a complexing agent into a reaction kettle, and precipitating to generate particles with a first particle size; forming a loose structure: continuously introducing the mixed metal salt solution and the precipitator, reducing the introduction of the complexing agent at a constant deceleration rate of (0.35-0.45) a per hour until the introduction amount is 0, enabling the reaction kettle to enter a complexing agent-free state, and continuously reacting until the particles grow from the first particle size to the second particle size; and particle growth: continuously introducing the mixed metal salt solution and the precipitant, and increasing introduction of the complexing agent at a constant acceleration rate of (0.35-0.45) a per hour until the introduction rate reaches a normal injection value, so that the particles grow from the second particle size to a third particle size, thereby obtaining the first slurry. The precursor prepared by the preparation method has no ball crack.

With respect to some embodiments, described herein is an apparatus for the growth and detection of particles suspended in a gas stream, using a working condensation fluid that has a Lewis number greater or less than unity. The apparatus can include a saturation chamber and a condensation chamber and can produce particle growth by way of a system which offers bidirectional temperature control of both chambers. The apparatus can include a detection system of particles in a detection chamber. A test fluid carrying the particles can pass through the detection chamber and be separated from the detection system with a barrier fluid that is also passing through the detection chamber.

Methods for increasing the particle size of solid electrolyte materials include combining the solid electrolyte material with molten elemental sulfur. By combining the solid electrolyte material with molten elemental sulfur, the particle size of the solid electrolyte material increases and the specific surface area of the solid electrolyte material decreases.

This invention relates to the preparation of lithium iron phosphate nanospheres. First, an FePO4 precursor is prepared using an iron and phosphorus source. Then, cerium sulfate and europium sulfate are added to Li3PO4 in a 1:1 doping ratio to prepare modified Li3PO4. Furthermore, a cationic surfactant, octadecyl dimethyl benzyl ammonium chloride, is added during the reaction of the FePO4 precursor and the modified Li3PO4. This invention utilizes modified Li3PO4 and the addition of the cationic surfactant octadecyl dimethyl benzyl ammonium chloride to achieve a better spherical shape in lithium iron phosphate. The addition of the surfactant has a significant impact on the particle size and morphology of iron phosphate, reducing particle aggregation and controlling particle growth. Modification of Li3PO4 with cerium sulfate and europium sulfate alters the interatomic spacing and positions within the crystal, causing cell shrinkage and changing the internal structure of the crystal, thus affecting the external morphology of iron phosphate. Doping with metal ions effectively increases the tap density of the material, thereby improving the volumetric capacity and cycle performance of lithium iron phosphate.

With respect to some embodiments, described herein is an apparatus for the growth and detection of particles suspended in a gas stream, using a working condensation fluid that has a Lewis number greater or less than unity. The apparatus can include a saturation chamber and a condensation chamber and can produce particle growth by way of a system which offers bidirectional temperature control of both chambers. The apparatus can include a detection system of particles in a detection chamber. A test fluid carrying the particles can pass through the detection chamber and be separated from the detection system with a barrier fluid that is also passing through the detection chamber.

The invention relates to the field of pseudo-boehmite, and discloses pseudo-boehmite as well as a preparation method and application thereof, the pore volume of the pseudo-boehmite is 0.5-0.7 mL / g, the peptization index DI is 95-99%, and the pore volume retention rate after peptization is greater than 70%. According to the pseudo-boehmite, by controlling reaction conditions and purified water aging conditions, a new weak base environment is provided for crystal growth, particle growth and interaction among particles are adjusted, the pseudo-boehmite with high peptizing property is obtained, the pore volume retention rate after peptizing is relatively high, and the pseudo-boehmite has relatively large pore volume.

The application provides a ternary precursor, a preparation method of the ternary precursor and a positive electrode material, and the ternary precursor is a nickel-cobalt-manganese hydroxide; the ternary precursor comprises a core layer, a connecting ring layer and a shell layer from inside to outside, the connecting ring layer is a dense structure, the core layer comprises a center layer and an intermediate layer from inside to outside, and the average thicknesses of the center layer, the intermediate layer and the shell layer are all greater than the average thickness of the connecting ring layer. The ternary precursor provided by the application is dense in structure by controlling the intermediate layer, the connecting ring layer and the shell layer to be dense in structure, so that the particle growth of the ternary precursor material is connected without a fault, the particle consistency of the ternary precursor material can be enhanced, the connecting strength and the compression resistance of the inner layer and the outer layer of the core-shell structure can be improved, and the particle structure of the ternary precursor material is more stable.

The application discloses a kind of process for preparing rare earth polishing powder by temperature control precipitation method, which comprises the following steps: step one, solvent preparation;Step two, temperature control precipitation reaction;Step three, cleaning;Step four, crushing;Step five, calcination.The process of the present application can control particle growth and inhibit particle agglomeration by controlling the initial temperature and temperature rise rate during the precipitation reaction using the temperature control precipitation method, and can obtain rare earth polishing powder with good uniformity and uniform particle size distribution after crushing and calcination.No aging treatment is needed after the precipitation reaction to adjust the apparent morphology of the precursor, which can effectively shorten the preparation process and is suitable for the field of micro-nano powder synthesis technology.