28results about How to "High tap density" patented technology

The application discloses a low-reversibility lithium iron phosphate precursor prepared by a reaction type emulsion method and a preparation method and application thereof. The lithium iron phosphate precursor material meets the following two conditions: ①2.44-2.86 g / cm 3 , and ②0.4<=<=2.5, wherein C is an average circularity, the circularity=(4*π*A) / G 2 ; wherein ρ is the density of the lithium iron phosphate precursor material measured by a gas displacement method, K 90 =(Dv90-Dv10) / Dv50, A is the projected area of a particle sample of the lithium iron phosphate precursor material, and G is the projected perimeter of the particle sample of the lithium iron phosphate precursor material. The lithium iron phosphate precursor material has a high tap density and good processing performance, the lithium iron phosphate prepared by a carbon reduction method from the lithium iron phosphate precursor material has a high tap density, thereby having a high volume specific capacity, and the prepared battery has a high energy density.

The application provides a lithium-rich manganese-based material and a preparation method and application thereof. The chemical general formula of the lithium-rich manganese-based material is Li 1.2+x (Mn a Co b Ni c ) 0.8‑x O2, wherein, -0.2

The application provides a silicon-carbon composite negative electrode material and a preparation method and application thereof, and belongs to the technical field of new energy materials and electrochemistry. Silicon powder and metal oxide are tightly combined through sand milling to build a continuous and stable structure, the volume expansion of the silicon powder and the metal oxide is inhibited, the stress of the silicon powder is released, then the sand-milled composite slurry is mixed with carbon material, and spray drying granulation and carbonization treatment are performed to prepare the negative electrode material. Based on the mutual stability effect, the application can accommodate and relieve the large volume expansion of the silicon material, and the stability of the material is maintained. The prepared composite negative electrode shows extremely low volume expansion (<20%). The metal oxide in the application has the ability to stabilize the SEI film and improve the conductivity. In combination with the addition of the carbon material, the conductivity of the composite material is synergistically improved, and the electrochemical performance is improved. Therefore, the prepared composite material has high sphericity, high tap density and excellent electrochemical performance.

The application provides a lithium iron phosphate positive electrode material, a preparation method thereof and an electrochemical device. The lithium iron phosphate positive electrode material comprises first particles with a particle size of 1000 nm or more and second particles with a particle size of 500 nm or less. The carbon content of the first particles is 0.4%-0.8%, the specific surface area of the first particles is 4 m 2 / g-8.0 m 2 / g, the carbon content of the second particles is 1.5%-2.0%, and the specific surface area of the second particles is 15 m 2 / g-20 m 2 / g. The first particles and the second particles have carbon content and specific surface area adjusted, and are mixed and graded so that the lithium iron phosphate positive electrode material has high compactness and long cycle performance.

This invention discloses the contents of a Tibetan Artemisia capillaris capsule, which is prepared from the following raw and excipient materials in weight percentages: 55%–59% filler, 3%–6% flow aid, and the remainder being Tibetan Artemisia capillaris extract; the Tibetan Artemisia capillaris extract is an alcoholic extract of Tibetan Artemisia capillaris. The Tibetan Artemisia capillaris granules of this invention not only meet the quality requirements of the pharmacopoeia but also have low cost, making them suitable for large-scale industrial production.

The application provides a high-performance titanium-based part powder hot isostatic pressing preparation method based on low-cost near-spherical bimodal powder. The preparation method uses a near-spherical bimodal particle size distribution titanium-based powder with good uniformity and high tap density as raw material, and combines powder hot isostatic pressing technology to prepare a high-performance low-cost titanium-based part, so as to meet the high-performance low-cost demand of complex structure and thin-walled titanium alloy parts in the fields of aerospace, weapon equipment and the like.

The invention provides a negative electrode material and a battery, the negative electrode material comprises an inner core and a coating layer located on at least part of the surface of the inner core, the inner core comprises graphite, the coating layer comprises a polymer, and the negative electrode material comprises at least one of an element N, an element S and an element P; the repose angle of the negative electrode material is theta degrees, the tap density of the negative electrode material is rho g / cm < 3 >, the compaction density of the negative electrode material under the pressure of 5T is T1 g / cm < 3 >, and the negative electrode material meets the formula: M = theta / rho * T1, and M is more than or equal to 105 and less than or equal to 160. According to the negative electrode material provided by the invention, the negative electrode material has high capacity, high compaction density and low expansion performance, and the fast charging performance of the negative electrode material is improved.

The application belongs to the field of lithium ion batteries, and specifically discloses aluminum-doped cobalt carbonate, a preparation method and application thereof. The aluminum-doped cobalt carbonate with small particle size, wide particle size distribution and high tap density can be prepared by controlling the reaction process for preparing the aluminum-doped cobalt carbonate.

The application discloses a spray pyrolysis device and a method for preparing ternary positive electrode precursors by using the same. The spray pyrolysis device comprises a feeding unit, a spraying unit and a pyrolysis unit; a first unit, a second unit and a third unit are sequentially arranged in a cavity of the spraying unit; an atomizing device is arranged at an outlet of the third unit; the first unit, the second unit and the third unit are heated by a first ultrasonic wave generating assembly, a second ultrasonic wave generating assembly and a third ultrasonic wave generating assembly respectively; the atomizing device is communicated with the pyrolysis unit, so that atomized liquid generated by the atomizing device enters the pyrolysis unit; a ignition device is arranged at an inlet of the pyrolysis unit; P1 < P2 < P3. The spray pyrolysis device can avoid the problems of particle breakage and hollowing of the positive electrode material precursor, so that the tap density of the positive electrode material precursor is high, the specific surface area is low, and the chlorine content is low, thereby improving the energy density, cycle performance and safety performance of the positive electrode material, and reducing the preparation cost.

A high-capacity, dense anode material and its preparation method are disclosed. The preparation includes: mixing graphite micropowder with a first forming agent, such as asphalt, and a second additive, such as ammonium dihydrogen carbonate, to form a mixture; pressing the mixture into a blank; heat-treating the blank under a protective atmosphere to form a sinter; pulverizing the sinter into powder; mixing the powder with a third coating agent, such as phenolic resin, to form a homogenized material; and carbonizing the homogenized material to form, for example, a lithium-ion battery anode material. The anode material prepared by this invention can effectively shorten the migration distance during lithium-ion diffusion, greatly improve the rate performance of the material, effectively reduce defects on the surface and in the bulk of the graphite anode, ensure the formation of a smooth and stable specific surface area, further ensure the stable formation of the SEI film and structural stability during cycling, and effectively guarantee the material's high initial efficiency, high capacity, and long cycle performance.

The application provides a lithium manganese iron phosphate precursor and a preparation method and application thereof. x Fe y M 1‑x‑y PO 7 / 2 , wherein x is 0.5-0.7, y is 0.3-0.5, and M is a doped metal element; the lithium manganese iron phosphate precursor has small particle size, uniform composition and high tap density, can solve the problems of large particle size, low tap density and ammonium component of the lithium manganese iron phosphate precursor, and can reduce the generation of a large amount of ammonia gas during lithium sintering of the precursor, so that the tap density and electrochemical performance of the lithium manganese iron phosphate positive electrode material are significantly improved.

This invention provides a nickel-core ceramic composite powder, a slurry, a preparation method thereof, and a multilayer ceramic capacitor; wherein the nickel-core ceramic composite powder comprises core-shell particles, the core-shell particles comprising a nickel core and a ceramic layer covering the nickel core, wherein the nickel core and the ceramic layer are bonded together by a coupling agent; the slurry is obtained by mixing the nickel-core ceramic composite powder, a slurry solvent, and a binder; the internal electrode in the multilayer ceramic capacitor can be made from the nickel-core ceramic composite powder or a slurry containing the nickel-core ceramic composite powder.

The invention discloses a crystal form A of acetyl L-carnitine hydrochloride, a preparation method of the crystal form A, and a bulk drug, a food additive, a feed additive and a composition containing the crystal form A. The crystal form A of the acetyl L-carnitine hydrochloride is good in solubility, high in stability, high in purity, regular in shape and suitable for being applied to bulk drugs, food additives and feed additives. The preparation method is simple in process, the crystal form A can be obtained at high yield through in-situ crystallization of a reaction solution and dispersion of ethanol, and the preparation method is suitable for large-scale industrial production.

The invention provides a preparation method and application of iron phosphate dihydrate and lithium iron phosphate, and the preparation method of iron phosphate dihydrate comprises the following steps: (a) mixing a phosphorus source solution with a first iron source, adding an oxidizing agent under a heating condition, and carrying out a reaction to form a primary crystal nucleus dispersion liquid; (b) simultaneously adding a second iron source into the primary crystal nucleus dispersion liquid to react with a phosphoric acid solution, and aging the obtained slurry to obtain iron phosphate dihydrate; wherein the first iron source comprises a ferrous sulfate solution, and the second iron source comprises a ferric chloride solution; the concentration of Cl <-> in the slurry in the step (b) is 0.2-0.4 mol / L, and the pH value is 0.25-1.0. The iron phosphate dehydrate prepared by the method is used as a precursor for preparing lithium iron phosphate, a high-temperature dehydration step is canceled, and an optimized mixing and sintering process is combined, so that high-performance and high-compaction lithium iron phosphate can be prepared in a short process at low cost.

This invention relates to the field of precious metal powder material preparation technology, and particularly to a manufacturing apparatus for submicron silver powder for semiconductor conductive adhesives. The apparatus includes: a raw material storage module comprising independent first, second, and third storage components; a mixing module comprising a mixing body, a composite stirring component, and a detection component, wherein the composite stirring component is disposed in the center of the mixing body, and the detection component is disposed within the mixing body for at least detecting the pH of the reaction slurry within the mixing body; and a pumping module disposed between the raw material storage module and the mixing module, for quantitatively conveying the raw materials from the first, second, and third storage components to the mixing body. The manufacturing apparatus for submicron silver powder for semiconductor conductive adhesives provided by this invention achieves precise feeding and automated production of submicron silver powder, and has significant application value.

This invention provides Co3O4 and its preparation method, lithium cobalt oxide, and a battery. The preparation method of Co3O4 includes the following steps: mixing a complexing agent solution, a hydrogen peroxide solution, and a cobalt solution to obtain a mixed solution, wherein the cobalt solution contains cobalt element, and the mass ratio of hydrogen peroxide to cobalt element in the hydrogen peroxide solution is (6~15) kg: 1 t; adding a bottom liquid to a reaction vessel, continuously adding the mixed solution and precipitant to the reaction vessel in a co-current manner, and simultaneously introducing air for reaction; the reaction vessel is connected to a thickener, and the liquid in the reaction vessel can enter the thickener, be dehydrated by the thickener, and then returned to the reaction vessel; wherein the volume of the bottom liquid accounts for 80%~100% of the volume of the reaction vessel, and the pH value of the bottom liquid is 9.5~10.6; when the D of the reaction product particles... 50 The particle size is 1.9 μm to 2.0 μm. The reaction is stopped, and the product is demagnetized, washed, dried, and calcined to obtain Co3O4. The method for preparing Co3O4 provided by this invention can produce Co3O4 with small particle size and high tap density.

This invention discloses a method for preparing carbon aerogel using water-soluble resin as a precursor. A reaction solution is prepared using water-soluble resin, aldehydes, an alkaline catalyst, and distilled water. Cyclodextrin, a pore-forming agent, is added to the clarified reaction solution. The reactants are then fed into a rapidly stirred oil phase, sheared into uniform micron-sized particles, and gelled at elevated temperatures to obtain a powder suspension. The suspension is centrifuged or filtered to obtain a powder, which is repeatedly washed with hot ethanol and then separated to obtain a powder material. The dried powder material is added to a carbonization furnace for carbonization to obtain carbon aerogel powder. The carbon aerogel powder is then added to a box-type atmosphere furnace and CO2 is introduced to obtain activated carbon aerogel powder with a porous network structure. This invention has the advantages of wide availability of raw materials and low production cost, making it suitable for large-scale industrial production, especially for the fabrication of supercapacitor electrodes, lithium-ion electrodes, and lithium-sulfur electrodes.

This invention provides a high-pressure compacted sodium iron pyrophosphate cathode material, its preparation method, and its application. The preparation method of the high-pressure compacted sodium iron pyrophosphate cathode material includes: weighing sodium, iron, and phosphorus sources according to the stoichiometric ratio of sodium iron pyrophosphate, adding carbon source and solvent, and mixing and grinding to obtain a precursor slurry; spray drying the precursor slurry to obtain precursor powder; compacting and granulating the precursor powder under a pressure of 10 MPa to 80 MPa to obtain denser precursor particles; and finally sintering at 500℃ to 650℃ for 6 to 15 hours under an inert atmosphere. This invention effectively eliminates internal cavities and interparticle gaps in the precursor through compaction and granulation, and controls the pressure within the range of 10 MPa to 80 MPa. The subsequent sintering process improves the density of the cathode material while controlling the impurity phase content to below 1 wt% and maintaining good electrochemical performance.

The application provides a preparation method of a zinc-doped lithium nickel cobalt manganese oxide positive electrode material, and the preparation method comprises the following steps: S1, mixing a nickel source, a cobalt source, a manganese source and a zinc source to obtain a mixed salt solution; S2, in an inert atmosphere, mixing the mixed salt solution and a precipitant solution by simultaneously dropping, continuously dropping the precipitant solution to adjust the pH value of the mixed solution to 10-11, performing a co-precipitation reaction, and obtaining a precursor slurry; S3, adjusting the pH value of the precursor slurry in step S2 to 7-8, performing solid-liquid separation, and drying the precipitate to obtain a precursor; and S4, mixing the precursor in step S3 with a lithium source, and sintering to obtain the zinc-doped lithium nickel cobalt manganese oxide positive electrode material. The method provided by the application can reduce the surface residual alkali content of the positive electrode material, and excellent cycle stability is obtained.

The present disclosure relates to a negative electrode active material for a rechargeable lithium battery, a negative electrode for a rechargeable lithium battery including the negative electrode active material, and a rechargeable lithium battery including the negative electrode. The negative electrode active material includes spherical graphite and an amorphous carbon layer around (e.g., surrounding) the spherical graphite, and the negative electrode active material has a volume ratio of 3% or less and an orientation ratio of 90 or less, the volume ratio being a volume ratio of a total volume of pores having a diameter of 100 nm to 1000 nm to a total pore volume.

The application discloses a method for preparing nanospheric iron phosphate by using ferroferric oxide, and comprises the following steps: S1, mixing an iron source with a morphology control agent, adding deionized water for mixing and dispersion stirring; S2, simultaneously adding concentrated phosphoric acid and an oxidizing agent drop by drop, reacting for 0.5-1 hours, then heating, and continuously reacting to obtain white precipitate; S3, centrifuging, filtering, washing, low-temperature drying and high-temperature sintering the white precipitate to obtain nanospheric iron phosphate. The prepared iron phosphate nanoparticles are uniform, present nanospheric, have high tap density, are easy to flow, and have good dispersibility. The formed iron phosphate particles are uniform, spherical, easy to filter and wash, beneficial to subsequent solid-liquid separation, have reduced material moisture content, have narrow particle size distribution range, uniform morphology and particle size, large tap density, and can obviously improve the electrochemical performance of lithium iron phosphate when used for synthesizing lithium iron phosphate materials, and the 0.2C discharge specific capacity is above 160mA·h / g.

The application discloses a method for preparing spherical-like trimanganese tetraoxide by an emulsion one-step method and belongs to the technical field of inorganic material preparation. The method uses soluble manganese salt as raw material, adopts water-in-oil emulsion micelles as a soft template, limits manganese ions in the spherical micelles, uses ammonia and ammonium salt buffer to stabilize the reaction pH, first prepares crystal seeds, then carries out parallel flow feeding and controllable oxidation, and finally obtains the spherical-like trimanganese tetraoxide through ripening, filtration, washing and drying. The application solves the problems of high cost, strict pH control and difficult morphology control in the traditional process, has the advantages of simple process, low cost, uniform morphology, high purity and the like, and the prepared product is suitable for battery-grade lithium manganate precursor and is suitable for industrial production.

The present application relates to the technical field of carbon nanotubes, in particular to a high tap density carbon nanotube and a preparation method thereof, the preparation method comprising: feeding the carbon nanotubes mixed with oily materials into a screw extruder to obtain the product. The present application mixes the carbon nanotubes with oily materials, shortens the distance between adjacent carbon nanotubes through the mutual attraction of the two, and prepares for improving the tap density of the carbon nanotubes, and then extrudes the carbon nanotubes through the screw extruder; a part of the oily materials will be pressed into the cavities of the carbon nanotubes during the extrusion, which promotes the further mixing of the carbon nanotubes and the oily materials, further shortens the distance between adjacent carbon nanotubes, removes the oily materials in the extrusion step, improves the tap density, and the tap density of the prepared product reaches 0.21 g / cm 3 , simplifies the subsequent purification operation, reduces the transportation cost of the carbon nanotubes, and is environmentally friendly and pollution-free.

The present application discloses a nickel-manganese binary precursor, a preparation method thereof, a cathode material, and a lithium-ion battery. The preparation method of the nickel-manganese binary precursor includes: providing a nickel-manganese salt solution, a precipitating agent, and a complexing agent; mixing the nickel-manganese salt solution, the precipitating agent, and the complexing agent to carry out a coprecipitation reaction to obtain the nickel-manganese binary precursor, and the chemical general formula of the nickel-manganese binary precursor is Ni x Mn y (OH) 2 , where x + y = 1, 0 < x < 0.40, 0 < y < 0.95; wherein, the process of the coprecipitation reaction includes: reacting for 10 - 60 min under the conditions of pH being 11.20 - 12.20 and ammonia concentration being 3.0 - 5.0 g / L to obtain a seed solution, and then reducing the pH to 10.2 - 10.8 to continue the reaction, and ending the reaction when the product particle size D 50 = 10.0 - 11.0 μm. This preparation method not only has a simple process, but also can obtain a nickel-manganese binary precursor with high sphericity and narrow particle size distribution.

The invention relates to a modified medium-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a precursor with a lithium salt, an aluminum-containing dopant and a magnesium-containing dopant, and performing first sintering to obtain a base material; and S2, uniformly mixing the matrix material obtained by the first sintering with a coating agent, carrying out spray drying, and then carrying out second sintering to obtain the modified medium-nickel ternary positive electrode material, the coating agent at least comprises WO3 and accounts for 8-10% of the mass of the base material. By introducing a special coating agent tungsten oxide, a stable tungstate interface layer is formed on the surface of the positive electrode material, the interface stability of the positive electrode material under high voltage is remarkably enhanced, and the integrity of the crystal structure of the material is improved by doping aluminum and magnesium elements in the dopant; and meanwhile, precursor powder with a coating agent distributed highly uniformly is obtained by adopting a spray drying means, and a complete and uniform composite coating layer is finally formed, so that the electrochemical performance of the material is remarkably improved.

The invention provides a fluidized repair roasting regeneration method for a new energy lithium iron phosphate battery positive electrode material, and belongs to the technical field of resource utilization of waste lithium ion batteries. Comprising the following steps: firstly, crushing and screening a positive plate obtained by discharging, disassembling and stripping the waste lithium iron phosphate battery to obtain lithium iron phosphate positive powder, and roasting the lithium iron phosphate positive powder; carrying out wet grinding to obtain slurry; and granulating and drying the slurry to obtain porous spherical precursor particles, carrying out fluidized high-temperature regeneration roasting, washing with water, and drying to obtain the high-performance new energy lithium iron phosphate battery positive electrode material. The new energy lithium iron phosphate battery positive electrode material prepared by the invention not only has high first discharge specific capacity and good cycle performance, but also has higher tap density and better processability due to the spherical morphology and proper particle size distribution, and can be directly used for preparation of new batteries.

This invention relates to the field of waste graphite recycling technology, specifically to recycled graphite and its preparation method, graphite negative electrode sheets, and batteries. The preparation method of recycled graphite includes: sequentially subjecting a dispersion containing waste high-purity graphite powder to precision filtration, spray drying, and microwave heating, wherein the impurity content in the waste high-purity graphite powder is less than 100 ppm. This preparation method can achieve "cost reduction and quality improvement" in the recycling of waste graphite, reducing production costs and improving the performance of the recycled graphite. In particular, it can improve the particle size uniformity, specific surface area, and tap density of the recycled graphite, thereby improving the initial coulombic efficiency and initial discharge specific capacity of the battery formed from it.

The invention belongs to the technical field of battery materials, and particularly relates to a coated modified nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The lithium nickel cobalt aluminate positive electrode material comprises an inner core and a coating layer coated on the inner core, a is greater than or equal to 1.01 and less than or equal to 1.05, x is greater than or equal to 0.75 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.20, z is greater than or equal to 0.01 and less than or equal to 0.05, and p is greater than or equal to 0 and less than or equal to 0.05; l comprises one of Mg, Zr, Mo, Ti and Zn; and the tap density of the coated and modified nickel cobalt lithium aluminate positive electrode material is 2.7-3.2 g / cm < 3 >. The coated modified nickel cobalt lithium aluminate positive electrode material provided by the invention has relatively good electronic conductivity and rate capability, and can inhibit lattice collapse caused by phase change under high voltage, reduce intergranular gaps, enhance thermal stability of the material, inhibit capacity fading caused by structure looseness in charge and discharge processes, and prolong the cycle life of a battery.