51results about How to "High tap density" patented technology

The invention belongs to the technical field of new energy materials, and particularly relates to a low-sulfur metal cation doped ammonium manganese ferric phosphate precursor, carbon-coated modified sodium manganese ferric pyrophosphate and a preparation method and application thereof. According to the invention, the low-sulfur metal cation doped ammonium manganese ferric phosphate precursor is successfully prepared. A proper amount of phosphoric acid source is added into the prepared metal cation doped ammonium manganese ferric phosphate precursor for treatment, so that the sulfur content of the precursor is remarkably reduced, and the molar ratio of manganese, iron, doped elements and phosphorus elements is regulated and controlled to be slightly smaller than 1. The atomic-scale distribution of elements in the precursor is realized, the tap density is also improved, and the subsequent preparation of a high-performance carbon-coated modified manganese ferric sodium phosphate pyrophosphate material is facilitated. The sodium ion battery constructed based on the material has excellent charge-discharge capacity, capacity retention ratio and cycling stability. In addition, the preparation method of the precursor is simple and convenient to operate and easy to control, and has the advantage of wide application.

The invention provides a preparation method of spherical iron phosphate, and relates to the technical field of lithium ion batteries, and the preparation method comprises the following steps: S1, one-step reaction: carrying out parallel flow on an iron salt solution, a phosphorus salt solution and ammonia water according to a molar ratio of 1: (0.8-1.2): (0.8-1.1) to generate amorphous iron phosphate slurry; adding ammonia water into the iron phosphate slurry to adjust the pH value to 1.5-2.5; s2, membrane washing; s3, a second-step reaction: adding pure water into the washed iron phosphate slurry, adjusting the iron concentration to 0.5-1.2 mol / L, adding a phosphoric acid solution, heating to 90-120 DEG C, and controlling the heat preservation time for 30-90 minutes after the material is converted into a white material, so as to obtain white slurry; s4, washing: taking a filter cake; s5, drying: generating iron phosphate dihydrate; s6, calcining: spherical iron phosphate is generated, and the iron phosphate is successfully converted from a traditional olive type, peanut type or honeycomb type to a spherical type through the preparation method provided by the invention.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece, a battery and an electric device. The negative electrode active material comprises: an inner core, which comprises porous graphite and a sulfur-doped hard carbon-metal oxide material, and the sulfur-doped hard carbon-metal oxide material is arranged in a pore channel of the porous graphite; the shell layer coats at least part of the surface of the inner core, and the shell layer comprises a polyaniline material. According to the negative electrode active material provided by the invention, through the synergistic effect among the porous structure of the graphite, the sulfur-doped hard carbon-metal oxide material and the shell layer containing the polyaniline material, the capacity performance, the rate performance and the cycle performance of the battery are improved at the same time, and the comprehensive improvement of the material performance is realized.

The invention discloses a urea resin doped bamboo parenchyma cell porous carbon electrode material and a preparation method thereof, and belongs to the technical field of electrochemical energy storage materials. The method comprises the following steps: mixing and stirring bamboo parenchyma cells and urea-formaldehyde resin powder, tabletting to obtain a urea-formaldehyde resin doped bamboo parenchyma cell composite material, and calcining to obtain urea-formaldehyde resin doped bamboo parenchyma cell carbon; grinding and mixing the carbonized sample and an activating agent, calcining, taking out, cleaning to be neutral, and drying to obtain the urea-formaldehyde resin doped bamboo parenchyma cell porous carbon. The bamboo parenchyma cells and the urea resin are used as raw materials, and the bamboo parenchyma cells are of a multi-wall-layer cavity structure, so that activation and construction of a pore structure are facilitated; the specific surface area of the porous carbon is increased by heating expansion of the urea-formaldehyde resin in carbonization and activation processes, and meanwhile, the urea-formaldehyde resin doped bamboo parenchyma cell porous carbon prepared by the method is used as an electrode material, has high tap density and high mass specific capacity, and is a positive electrode material which is expected to be industrialized.

The invention discloses silver particles and a preparation method and application thereof, and the preparation method comprises the following steps: S1, dispersing a silver source in an alcohol amine solution, and adding a dispersing agent to form a base solution; the molar ratio of silver ions in the silver source to an alcohol amine compound in the alcohol amine solution is 1: (0.05-5); s2, the base solution and an organic amine solution are subjected to a hydrothermal reaction, and the silver particles are prepared; the molar ratio of silver ions in the silver source to the organic amine compound in the organic amine solution is 1: (0.005-0.15). The proportion of the large-particle-size silver particles and the small-particle-size silver particles is regulated and controlled by controlling the dosage of the alcohol amine solution and the organic amine solution, so that gaps of the large-particle-size silver particles are filled with the small-particle-size silver particles, and the tap density of the silver powder is improved.

The invention provides a large-particle narrow-span distribution ternary precursor and a preparation method and application thereof, and belongs to the technical field of batteries, the preparation method comprises the following steps: ammonia concentration in a base solution A is 2.0-5.0 g / L, a nickel-cobalt-manganese metal salt solution, ammonia water and an alkali solution are introduced into the base solution A in a parallel flow manner, a first coprecipitation reaction is carried out, and a nickel-cobalt-manganese ternary precursor seed crystal is prepared; in the first coprecipitation reaction, the stirring rotating speed is 150 to 350rpm; a base solution B is prepared, the ammonia concentration in the base solution B is 5.0-7.0 g / L, a nickel-cobalt-manganese metal salt solution, ammonia water and an alkali solution are introduced into the base solution B in a parallel flow mode, a second coprecipitation reaction is conducted, and a nickel-cobalt-manganese ternary precursor is prepared; in the second coprecipitation reaction, the stirring rotation speed is 150 to 280 rpm. The problems that nickel-cobalt-manganese ternary precursor particles are prone to cracking and agglomeration are solved, and therefore the precursor narrow in particle size distribution and good in sphericity degree is obtained.

The invention discloses a high-tap-density iron phosphate battery precursor which is prepared by the following steps: dispersing a basic ammonium iron phosphate filter cake into an acid solution with the pH value of 0.4-0.6, stirring until the filter cake is completely dissolved, adding an alkali solution to adjust the pH value of a base solution to 0.8-1.2, and adding polyethylene glycol for reaction; after the reaction is finished, alkali liquor continues to be added into the solution to adjust the pH value to 1.8-2.2, the temperature is increased to the aging temperature, iron phosphate dihydrate slurry is prepared, and finally the anhydrous iron phosphate with the high tap density is prepared after suction filtration, water washing, drying and calcination are conducted. According to the iron phosphate battery precursor disclosed by the invention, basic ammonium iron phosphate is firstly subjected to acid leaching and then subjected to recombination crystallization during preparation, the pH value of a system is adjusted step by step, and polyethylene glycol is introduced, so that the tap density is improved, the iron phosphate battery precursor has a large specific surface area, large and small particle grading is formed, and the compaction performance of lithium iron phosphate is improved.

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.

The invention relates to the technical field of battery materials, and discloses an iridium and praseodymium doped ternary precursor, a positive electrode material, a preparation method of the positive electrode material, a positive electrode and a battery. The iridium and praseodymium doped ternary precursor comprises an inner core and a coating layer, the inner core is formed by nickel-cobalt-manganese hydroxide doped with iridium, and the coating layer is formed by nickel-cobalt-manganese hydroxide doped with praseodymium; the chemical formula of the iridium and praseodymium doped ternary precursor is NixCoyMn1-x-y (OH) 2 [Ir] m [Pr] n, wherein x is greater than or equal to 0.34 and less than or equal to 0.9, y is greater than or equal to 0.05 and less than or equal to 0.33, and 1-x-y is greater than or equal to 0.05 and less than or equal to 0.33. The preparation method comprises the following steps: coprecipitating nickel ions, cobalt ions, manganese ions and iridium ions to obtain an inner core; and then nickel ions, cobalt ions, manganese ions and praseodymium ions are co-precipitated on the surface of the inner core to form a coating layer. The precursor provided by the invention has relatively good electrochemical 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 discloses a ternary single crystal positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of battery materials. The preparation method of the ternary single-crystal positive electrode material comprises the following steps: mixing a ternary positive electrode material precursor with a first lithium salt, and carrying out first sintering to obtain a first sintered material; mixing the first sintering material with a second lithium salt, and carrying out second sintering; the ratio of the molar weight of Li in the first lithium salt to the total molar weight of metals in the ternary positive electrode material precursor is 0.6: 1 to 0.85: 1; the ratio of the total molar weight of Li in the first lithium salt and Li in the second lithium salt to the total molar weight of metal in the ternary positive electrode material precursor is 1.05: 1. The method is simple to operate, the sphericity and the tap density of the ternary single crystal positive electrode material can be effectively improved by adopting two times of lithium supplementation and controlling the lithium ratio of each time of lithium supplementation, so that the volume energy density of the material is further improved, and the specific capacity and the cycle performance of a battery prepared from the positive electrode material are favorably improved.

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 invention relates to the field of battery materials, in particular to a positive electrode active material, a positive plate and a lithium ion secondary battery, the chemical formula of the positive electrode active material is Li1 + qNixCoyMnzO2, q is more than 0 and less than or equal to 1, x is more than or equal to 0.2 and less than or equal to 0.45, y is more than or equal to 0.02 and less than or equal to 0.20, and z is more than or equal to 0.35 and less than or equal to 0.78; the primary particle size of the positive electrode active material is 55-150 nm, Dv50 is 3-5 [mu] m, Dv10 is 1-2 [mu] m, Dv90 is 7-9 [mu] m, and (Dv90-Dv10) / Dv50 is 1.3-1.8, and the positive electrode active material under the particle size and particle size distribution is not only concentrated and uniform in particle size distribution, but also can obtain larger compaction density and better sphericity, so that the positive electrode active material has higher compaction density.

The invention provides a preparation method and application of carbon-coated molybdenum-doped vanadium oxide microspheres, and relates to the technical field of positive electrode materials of zinc ion batteries. The preparation method of the carbon-coated molybdenum-doped vanadium oxide microspheres comprises the following steps: dissolving a vanadium source and a molybdenum source in a certain proportion in a mixed solution of isopropanol and glycerol, and carrying out solvothermal reaction; and carrying out centrifugal washing on the reaction product, drying, and calcining in a tubular furnace to finally obtain the carbon-coated molybdenum-doped vanadium oxide microspheres. The carbon-coated molybdenum-doped vanadium oxide microsphere positive electrode material is prepared by combining a simple one-step solvothermal method with subsequent heat treatment, the preparation process is simple, and the problems that a vanadium-based positive electrode material of an aqueous zinc ion battery is easy to dissolve and poor in conductivity and cycling stability are well solved by adopting a dual-modification strategy. The carbon-coated molybdenum-doped vanadium oxide microsphere positive electrode material prepared by the invention has high tap density, reversible specific capacity and good cycling stability and rate capability, and has a very good application prospect.

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.

The invention provides a method for preparing high-tap-density iron phosphate from lithium extraction slag, the high-tap-density iron phosphate and application of the high-tap-density iron phosphate, and belongs to the technical field of lithium battery material recovery. The method comprises the following steps: mixing the lithium extraction slag and a sulfuric acid solution for acid dissolution to obtain an iron-phosphorus mixed solution; carrying out reaction on the iron-phosphorus mixed solution and ammonia water in a diagonal adding manner, and rinsing to obtain an iron-phosphorus filter cake; and adding a sulfuric acid solution for slurrying and aging to obtain wet iron phosphate dihydrate, and sintering to obtain the anhydrous iron phosphate. The seed crystal reaction of the iron phosphate is optimized into diagonal addition of the iron-phosphorus mixed solution and the ammonia water, so that the particle size distribution of the iron phosphate tends to normal distribution; according to the method, the type and the amount of acid added in the crystallization reaction of the iron phosphate are optimized, primary particles of the iron phosphate are further refined, so that the particles are tightly agglomerated, and the iron phosphate particles with high tap density (the tap density is greater than 1.03 g / cm < 3 >) are successfully prepared.

The invention discloses a quaternary sodium battery positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode material production. A carbonate coprecipitation method is adopted, a four-metal-element metal salt solution and a carbonate precipitant solution are controlled to react in an alkaline aqueous solution, a precursor is prepared, and the positive electrode material with the structural formula of NaMnxFeyNizCOrO2 is obtained through material mixing and calcination. According to the method, a more stable crystal structure is provided for the material, and the cycling stability of the material is improved, so that the performance of the positive electrode material is obviously improved, and the energy density and the practicability are further improved.

A kind of high nickel precursor, positive electrode material and preparation method thereof, belong to the technical field of lithium ion battery materials, overcome the defect that doping elements are unevenly distributed in the material body when the prior art prepares high nickel precursor. The preparation method of the high nickel precursor of the present invention comprises the following steps: step 1, prepare Al-containing nickel cobalt manganese salt solution, ammonia solution, alkali solution precipitant and ammonia bottom liquid; in the Al-containing nickel cobalt manganese salt solution, the Al / TM atomic ratio is 0.001-0.01, and TM is the sum of the amount of substance of nickel, cobalt and manganese atoms; step 2, add the ammonia bottom liquid to the reactor, and adjust the pH of the ammonia bottom liquid to 10.7-11.7, pump the Al-containing nickel cobalt manganese salt solution, ammonia solution and alkali solution precipitant into the reactor at the same time, stir during the feeding process, and continue stirring reaction after the feeding ends; step 3, solid-liquid separation, washing, drying to obtain a high nickel precursor. The present invention can reduce the generation of particle microcracks and improve the long cycle stability of the material.

Provided in the present disclosure are a lithium iron phosphate composite material, and a preparation method therefor and the use thereof. The lithium iron phosphate composite material comprises a core and a shell that covers the surface of the core, wherein the core is Li6MnO4, and the shell is carbon-coated lithium iron phosphate. The lithium iron phosphate composite material provided in the present disclosure uses Li6MnO4 as a positive electrode lithium supplementation material, and solves the problems of the loss of active lithium and the severe capacity depletion of a lithium iron phosphate positive electrode material during high-rate charging and discharging, such that the rate capability of the lithium iron phosphate material is improved, and the cycle life of a battery under high-rate conditions is prolonged.

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.

The invention belongs to the technical field of battery negative electrode material recovery, and particularly relates to a method for preparing a lithium battery negative electrode material through microwave-assisted recovery of modified waste graphite and the prepared modified graphite lithium battery negative electrode material. Aiming at the problems of poor electrolyte compatibility, poor cycling stability and the like of a graphite material, asphalt is adopted as a carbon source, recycled graphite is subjected to coating modification, and then a segmented heating solid-phase pyrolysis process is performed to prepare the graphite-based composite material with the core-shell-like structure. The waste graphite recycling, modifying and regenerating process disclosed by the invention has the characteristics of simplicity, high efficiency and environmental protection, the recycled graphite can be directly used as a lithium battery negative electrode material after being regenerated and modified, and the waste graphite recycling, modifying and regenerating process has the advantages of low cost, high reversible specific capacity and good cycle performance; and a new technical route is provided for preparation of a high-performance and low-cost lithium ion battery negative electrode material.

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 belongs to the technical field of target materials, and discloses TCO target material powder and a preparation method thereof.The TCO target material powder is obtained by conducting slurry preparation, spray granulation, sieving and homogenizing on main material powder and auxiliary material powder; the surface of the powder obtained by spray granulation contains a release agent coated by spraying, and the release agent is a stearic acid-ethanol solution containing 0.5-4% by mass of stearic acid; the surface of the TCO target material powder is coated with a layer of stearic acid, so that the fluidity of the powder can be effectively enhanced, the powder is further graded and sieved and then is matched with powder with different particle sizes to be homogenized, the tap density of the TCO target material powder is improved, and the demolding performance of the TCO target material powder after compression molding can also be improved; in addition, the invention further provides a TCO target material prepared from the TCO target material 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.