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253results about How to "High tap density" patented technology

High-performance lithium ion battery cathode material and preparation method thereof

The invention relates to a lithium ion battery cathode material LiNixCoyM1-x-yO2 prepared from micron-sized single crystal particles and a preparation method thereof, wherein x is greater than 0 and is not more than 0.8, y is greater than 0 and is not more than 0.5, and M is one or two of Li, Mn, Al and Mg. The invention is characterized in that (1) composite oxide or hydroxide of transition metal nickel, transition metal cobalt and modified metal M is used as a raw material, the composite oxide or hydroxide is porous aggregate comprising nanocrystals, the average size of the aggregate is 2-50 micrometers, and the specific surface area of the aggregate is greater than 15m<2>/g (measured by BET method); (2) the composite metal oxide or hydroxide and lithium salts are milled in a ball mill, the micron-sized composite metal oxide or hydroxide is converted into nanocrystal particles to obtain a nano-sized mixed precursor of the composite metal oxide or hydroxide and the lithium salts, and the mixed precursor is sintered at uniform temperature to obtain the required lithium ion battery cathode material; and (3) the prepared lithium ion battery cathode material LiNixCoyM1-x-yO2 is basically prepared from micron-sized single crystal particles, and the average size of the single crystal particles is 2-20 micrometers. In addition, the product has excellent physical and electrochemical properties, such as ultra-low specific surface area, reasonable particle size distribution, good electrode processing properties, ultra-long cycle life, excellent rate capability, obvious high and low temperature cycling and storing properties and excellent safety; and the product can be widely used as a high-performance lithium ion battery cathode material. The invention provides the high-performance lithium ion battery cathode material and the preparation method thereof.
Owner:QINGDAO LNCM

Preparation method of high density nickel cobalt lithium manganate positive electrode material

The invention discloses a preparation method of a high density nickel cobalt lithium manganate positive electrode material, LiNixCoyMnzO2. The preparation method comprises the following steps: firstly, mixing a nickel salt solution, a cobalt salt solution and a manganese salt solution according to a certain mol ratio, adding the mixed solution, a complexing agent solution and a precipitant solution together to a stirring reaction kettle with a base solution, fully reacting, carrying out solid-liquid separation, and washing and drying to obtain a globular nickel cobalt manganese oxyhydroxide precursor; calcining the precursor at the temperature of 350-900 DEG C for 2-20 hours to obtain a globular nickel cobalt manganese oxide precursor, and smashing the globular nickel cobalt manganese oxide precursor at high speed to obtain a mono-crystalline nickel cobalt manganese oxide precursor; mixing a lithium source and the mono-crystalline precursor according to a certain mol ratio, calcining at the temperature of 700-980 DEG C for 2-20 hours, and smashing and classing to obtain the mono-crystalline nickel cobalt lithium manganate positive electrode material. The preparation method provided by the invention has the advantages that the compacted density of the prepared nickel cobalt lithium manganate material is large, the specific capacity is high, the rate property and consistency are good, the preparation method is simple, and the preparation process is easy to control and operate.
Owner:HUNAN SOUNDDON NEW ENERGY

Method for preparing active electrode material of lithium ion battery

The invention discloses a method for preparing an active electrode material of a lithium ion battery. The method comprises the following steps of: preparing a nano-crystal with electrochemical activity into an aqueous solution, and adding a carbon source and a surface active agent into the aqueous solution to form a uniform and stable mixture solution; and preparing the mixture solution into spherical particles under the condition that the temperature is between 200 and 900 DEG C through a spray granulation method, and performing heat treatment on the spherical particles in 400-900 DEG nitrogen gas so as to form the active electrode material of the lithium ion battery. Conductive networks are distributed in the active electrode material, and the active electrode material has a porous structure, so that the active electrode material has good lithium ion and electron transmission channels; and the lithium ion battery prepared from the active electrode material has high specific capacity, high-current charging and discharging and high cyclical stability. The method for preparing the electrode material of the lithium ion battery through a spraying method can be easily applied to mass production, and is generally used for preparing various high-performance electrode materials of the lithium ion battery.
Owner:TSINGHUA UNIV

Lithium ion battery cathode multicomponent material and preparation method thereof

The invention relates to a preparation method of a lithium ion battery cathode multicomponent composite material Lia(NixCoyMnz)NbO2 / M, and a preparation method of a precursor of the multicomponent material. The lithium ion battery cathode multicomponent composite material belongs to a nickel cobalt lithium manganate series cathode material, and can be expressed by a chemical formula Lia(NixCoyMnz)NbO2 / M. The preparation method comprises the following steps: measuring to prepare a standard mixed solution; under the protection of an inert atmosphere, adding a proper amount of a complexing agent and a precipitating agent into the mixed solution, adjusting the pH value to reach the end point of the reaction, filtering, washing and drying to obtain a spherical multicomponent precursor containing doped elements; grinding a lithium source and multicomponent precursor obtained in the step (2) in a ball mill; and placing the mixture obtained in the step (3) in a high temperature kiln to obtain a first sintering, so as to obtain the multicomponent material. The invention thorough mixing of precursor and lithium salt improves reaction activity, and strictly controls the temperature in the process of sintering, so as to obtain the multicomponent cathode material with regular morphology and uniform particle size.
Owner:QINGDAO QIANYUN HIGH TECH NEW MATERIAL

Lithium iron phosphate composite material, production method and use thereof

Provided are a lithium iron phosphate composite material, the production method thereof and the use thereof The lithium iron phosphate composite material has a micro-size particle structure, which contains nano-size grains of lithium iron phosphate and graphene inside, and bears nano-carbon particulates outside. The lithium iron phosphate composite material has the properties of high conductivity, high-rate charge/discharge performance and high tap density. The production method comprises: preparing an iron salt mixed solution according to the mole ratio of P:Fe=1:1; adding the above solution into an organic carbon source aqueous solution, followed by mixing and reacting, so as to obtain nano-iron phosphate covered with organic carbon source; adding the above nano-iron phosphate covered with organic carbon source and a lithium source compound into an aqueous solution of graphene oxide, agitating, mixing, and then spray drying, so as to obtain a precursor of lithium iron phosphate composite material; calcinating said precursor in a reduction atmosphere and cooling naturally, so as to obtain said lithium iron phosphate composite material. The material is used for lithium ion battery or positive electrode material.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD

Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries

ActiveCN103066257ASolve the problem of complete oxidationPrevent "cation mixing" phenomenonCell electrodesLithium hydroxideOxygen
The invention provides a preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries. The method comprises: step 1, using a nickel-cobalt-aluminum precursor prepared through a coprecipitation method and doped with mixed ions as raw materials, putting the raw materials into a sealed hearth of a pressure furnace, continuously introducing oxygen until a fixed pressure value is formed, then heating to a pre-burning temperature and keeping warm for a period of time, and cooling to obtain an oxidized precursor; and step 2, adding measured lithium salt or lithium hydroxide into the oxidized precursor, ball milling and uniformly mixing; heating the uniformly mixed raw materials to a certain temperature and keeping warm for a period of time, and meanwhile continuously introducing oxygen to complete a sintering process, thereby obtaining the finish product. According to the invention, through a hyperbaric oxygen atmosphere, the oxygen are enabled to fully infiltrate into particles of the raw materials which has a certain accumulation thickness, thereby preventing situations that only surface materials are oxidized under a normal pressure, and ensuring a full conversion of Ni<2+> to Ni<3+> by a full pre-oxidation.
Owner:GUANGZHOU LIBODE NEW MATERIAL

Method for preparing lithium ferrous silicate or carbon ferrous silicate cathode material for lithium ion battery

The invention discloses a method for preparing a lithium ferrous silicate or carbon ferrous silicate cathode material for a lithium ion battery, relates to a method for preparing a cathode material for a lithium ion battery and aims to solve the problems that the conventional prepared lithium ferrous silicate or carbon ferrous silicate composite is low in purity, inhomogeneous in granularity, and poor in electrochemical cycling stability. The method comprises the following steps of: 1, weighing a lithium salt compound, a ferric salt compound, a nano silica and a carbon source compound; 2, dispersing the weighed materials in the step 1 into a dispersing agent by a ball mill or ultrasonic dispersion method to obtain mixed liquor; 3, drying the mixed liquor by a spray drying method to obtain precursor powder; and 4, heating, namely heating the precursor powder obtained in the step 3 under the protection of inert gas in a certain flow rate, cooling naturally to room temperature, and thus obtaining the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery. The method is mainly applied to preparation of the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery.
Owner:HARBIN INST OF TECH

Composite carbon fluoride cathode material for lithium primary battery, preparation method and application thereof

The invention belongs to the technical field of a cathode material for a lithium primary battery, particularly relates to the field of preparation of the cathode material for a fluorocarbon battery, and in particular to a composite carbon fluoride cathode material for the lithium primary battery, a preparation method and an application thereof. The material is a composite material prepared by ballmilling and mixing a porous carbon fluoride material having a high tap density and a carbon fluoride material having a high graphitization degree and then fluorinating the mixture. The composite material has a carbon content of 38-60%, a fluorine content of 40-62% and a tap density of greater than 0.8g/ml; the mixing mass ratio is in the range of 1:0.1-1:10; and the composite material has high specific surface area, high tap density and high graphitization degree. Due to the high tap density of the material, the overall high volumetric specific energy of the material is guaranteed; through anion diffusion channel composed of porous carbon fluorides, the voltage hysteresis phenomenon at the initial stage of the battery discharge is effectively improved and the overall discharge performance of the material is improved.
Owner:SHANDONG ZHONGSHAN PHOTOELECTRIC MATERIAL CO LTD

Fe base lithium sale compound anode materials and its making method

The invention discloses a ferrous lithium salt composite anode material and thepreparation method thereof. The technical problems which are needed to be solved are to enhance the high-rate electricity discharging of the anode material, and the manufacturing and the processing performances of battery electrodes are improved. The ferrous lithium salt composite anode material has lithium iron phosphate, and forms the composite material by adulterated with or covered by nickel-cobalt-manganese-lithium or nickel-cobalt-aluminum-lithium material. The weight ratio of the lithium iron phosphate and the nickel-cobalt-manganese-lithium or the nickel-cobalt-aluminum-lithium material is 9 to 7 : 1 to 3, and the micro-morphology is in a sphericity , or is like a sphericity, with a ration between a horizontal length and a vertical length of 1.2 to 2.5. The crystal is in the structure of an olivine type, a space group is Pbnm, and a particle diameter is 1 to 20microns. The preparation method comprises mixture, fusion processing and screen separation. Compared with the prior art, the ferrous lithium salt composite anode material has the advantages of capable of lowering specific surface area, capable of enhancing the voltage platform of the anode material, favorable processing performance, high tap density, favorable conductivity, favorable rate discharge performance and safe performance, capable of improving high and low temperature cycling performance, and favorable compatibility with various cathodes and electrolytes.
Owner:常州锂源新能源科技有限公司

Method for preparing high-density pure tungsten product through low-temperature sintering

ActiveCN105478776ALower sintering densification temperatureHigh tap densityHigh densityHydrogen atmosphere
The invention provides a method for preparing a high-density special-shaped pure tungsten product through low-temperature sintering, and belongs to the technical field of powder injection molding. The method comprises the technological processes that an air flow mill is adopted for carrying out dispersing and staging treatment on commercially available high-purity tungsten powder, the treated powder and a bonding agent are evenly mixed for mixing, and even feed is obtained; the feed is subjected to injection molding to form a blank in a certain shape; and the formed blank is subjected to solvent degreasing and hot degreasing and then is sintered, and the tungsten product is obtained. Powder is subjected to dispersing and staging treatment through the air flow mill under the protective atmosphere, the powder is driven by gas to collide with each other and can be treated on a large scale, and no impurity is introduced; the particle size distribution of the treated powder becomes narrow, and the shape of particles becomes regular and is similar to a spherical shape; and loose-fitting tap density is increased, the loading amount of the injection-molded powder is correspondingly improved to 55%-70%, and the density of the pure tungsten product manufactured after sintering of the hydrogen atmosphere of 1,900 DEG C is higher than 96%.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method for multiple precursors with concentrated particle size distribution by multistage continuous synthesis

Disclosed is a preparation method for multiple precursors with concentrated particle size distribution by multistage continuous synthesis. The preparation method comprises the following steps of: 1) preparing a metal salt solution, an alkali solution and an ammonium hydroxide solution; 2) enabling a reaction kettle and a solid concentration thickener to be connected in series; 3) injecting the metal salt solution, the alkali solution and the ammonium hydroxide solution into the reaction kettle 1, wherein the slurry in the reaction kettle 1 is pumped into the thickener 1 for solid-liquid separation to increase solid content when the liquid level in the reaction kettle 1 reaches the full kettle state, and the thick slurry in the thickener 1 is pumped into a reaction kettle 2; 4) performing stirring when the reaction kettle 2 is full of the slurry, and adding the metal salt solution, the alkali solution and the ammonium hydroxide solution to continue a continuous precipitation reaction, and then overflowing the product in the reaction kettle 2 into an aging tank 1; and 5) enabling the product in the aging tank 1 to be centrifuged, washed and dried. The preparation method has the advantages that the technology is simple, easily operated, energy-saving and environment-friendly. The product features good appearance, concentrated particle size distribution, high vibration density andhigh efficiency.
Owner:QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1

Silicon-carbon composite electrode and preparation method thereof

The invention discloses a silicon-carbon composite electrode and a preparation method thereof. The silicon-carbon composite electrode is of a shell-core structure, wherein a core contains silicon powder, a hollow carbon sphere and an inorganic lithium salt compound, the hollow carbon sphere is doped into the silicon powder, and the inorganic lithium salt compound is electrically deposited between the silicon powder and the hollow carbon sphere; and a shell is a high-molecular polymer. According to the silicon-carbon composite electrode prepared by virtue of the preparation method, by utilizing lithium salt deposited on the surface of silicon, the lithium ion transmission rate during charging and discharging is increased, sufficient lithium ions are provided for the formation of an SEI membrane, the initial efficiency can be obviously improved, the expansion rate of a silicon material can be decreased, and the cycle performance of the silicon material can be improved; and meanwhile, the silicon-carbon composite electrode has the characteristics of high stability and strong stability at 100-150 DEG C, the contact between the lithium salt material and air can be avoided, and the processability and the safety performance of the lithium salt material can be improved; and furthermore, the polymer has relatively good dissolving property with an electrolyte solvent, so that the polymer can serve as lithium salt, and the initial efficiency, safety performance and energy density of a cathode material are improved.
Owner:深圳市金牌新能源科技有限责任公司

One-step preparation method of LiFePO4 powder coated with carbon

The invention relates to a one-step preparation method of LiFePO4 powder coated with carbon. Lithium compounds, ferrite and phosphorous compounds are taken as raw materials, additive is antioxidant and glutin that accounts for 1-6% of the mass of theoretically generated lithium ferrous phosphate; the glutin is dissolved in de-ionized water which is then heated and stirred at the temperature of more than 40 DEG C to obtain the aqueous solution of the glutin. The prepared ferrite solution and the glutin solution are added to a Li3PO4 system to be mixed uniformly; the mixed solution reacts at the temperature of 120-170 DEG C for 2-5h; the obtained product is dry lithium ferrous phosphate powder coated with the glutin; the prepared powder is filled in a quartz crucible and calcined at the temperature of 550-750 DEG C under the protection of N2 atmosphere, and finally the lithium ferrous phosphate powder coated with carbon is obtained. The shape of the prepared lithium ferrous phosphate particles is uniform and columnar with the grain diameter being 400nm, the surface coating is thin and uniform amorphous carbon, has high tap density, is beneficial to improving the electrochemical performance of materials and is suitable for being used as anode material. The method has simple process route and no pollution and is suitable for scale production.
Owner:TIANJIN UNIV
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