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1475results about How to "Coated evenly" patented technology

Lithium ion battery silicon-based composite anode material, preparation method thereof and battery

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.
Owner:BTR NEW MATERIAL GRP CO LTD

Carbon-coated ternary positive electrode material and preparation method thereof

The invention discloses a carbon-coated ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a ternary positive electrode material precursor by taking nickel salt, cobalt salt and manganese salt as raw materials; S2, preparing a conductive carbon dispersion system, wherein conductive carbon is dispersed in water containing an organic carbon source; S3, adding the ternary positive electrode material precursor and a lithium compound into the conductive carbon dispersion system, and mixing uniformly to obtain a mixture; S4, drying the mixture under a vacuum condition; S5, carrying out high temperature treatment on the dried mixture under a closed condition or in an inert gas protection atmosphere so as to obtain the carbon-coated ternary positive electrode material. The carbon-coated ternary positive electrode material is uniform in coating, simple to operate, low in cost and high in efficiency; the conductive carbon and the ternary positive electrode material are simultaneously coated with network-shaped amorphous carbon which serves as a conductive medium or a channel of the conductive carbon and the ternary positive electrode material, thereby greatly improving the rate performance of the ternary positive electrode material.
Owner:SHENZHEN BETTERPOWER BATTERY

Lithium ion battery anode material manganese lithium phosphate and preparation method thereof

The invention discloses a manganese/lithium phosphate of lithium iron battery positive pole material and a production method thereof, the technical issue to be solved is to improve electrochemical performances of the positive pole material. The material of the invention includes substrates of manganese/lithium phosphate which are covered by a carbon material covering layer, the lithium covering the manganese/lithium phosphate behind the carbon material covering layer is spherical and has microscopic characteristics of being near spherical, rhombic, tapered, tabular, layered or/and block-shaped as well as of having 0.5-30 mum long and short axles. The production method comprises the following steps of: production of nanometer particles, liquid phase mixed reaction, production of precursor, sintering treatment, covering organic substances. Compared with the prior art, the invention improves the electron conductivity of the manganese/lithium phosphate by covering with carbon liquid phase, the carbon sufficiently covers active materials to efficiently prevent particle aggregation, the invention has the characteristics of about 4V of discharge voltage, high discharge and charge capacitance, excellent circulation stability, high safety, simple process, low cost and little influence on the environment.
Owner:SHENZHEN CITY BATTERY NANOMETER TECH

High-nickel single-crystal ternary cathode material with low surface residual alkali content and preparation method thereof

InactiveCN110436531AIn-situ encapsulationUniform coating in situCell electrodesSecondary cellsLithium hydroxideSingle crystal
The invention discloses a high-nickel single-crystal ternary cathode material with low surface residual alkali content and a preparation method thereof. The preparation method comprises the followingsteps: weighing lithium hydroxide, an oxide additive and a nickel-cobalt-manganese ternary precursor, and carrying out uniform mixing through a dry high-speed mixing process so as to prepare a mixed material; subjecting the mixed material to first sintering so as to obtain a first sintered material; crushing the first sintered material, and carrying out sieving so as to obtain a first crushed material; weighing the first crushed material, a coating agent and deionized water, and carrying out water washing under stirring so as to prepare a slurry, wherein the coating agent comprises an elementX which is one or more selected from the group consisting of B, Al, Ba, Zr, Mg, Ca, Ti, Si, V, Sc, Nb, Ta and Z; drying the slurry under a vacuum condition through a dynamic rotary drying process so as to obtain a dry material; subjecting the dry material to secondary sintering so as to obtain a secondary sintered material; and crushing the secondary sintered material, and carrying out sieving soas to obtain a product. The high-nickel single-crystal ternary cathode material and the preparation method thereof provided by the invention has the following advantages: alkali reduction by water washing and in-situ coating by a wet process can be synchronously completed; the process is simple; high compaction density is realized; and the content of residual alkali is low.
Owner:ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD

Preparation method of bicomponent energetic material core-shell structure

ActiveCN103086812AReduce rubbing sensitivity and property dropMaintain energy levelsNitrated acyclic/alicyclic/heterocyclic amine explosive compositionsPre treatmentHigh energy
The invention discloses a preparation method of a bicomponent energetic material core-shell structure. The method comprises the following steps: 1, adding a core layer energetic component to a core layer energetic component modifier solution, stirring at room temperature for 30min, filtering, and drying; 2, adding a core layer component obtained in step 1 into ultrapure water, and carrying out ultrasonic pretreatment for 30min; 3, adding shell layer energetic component powder to the ultrapure water, and carrying out ultrasonic treatment for 15-60min; and 4, adding a shell layer component suspension obtained in step 3 to a core layer component suspension obtained in step 2, continuously carrying out ultrasonic treatment for 5-360min, filtering, drying to obtain a bicomponent energetic material having a core-shell structure, and marking as the core layer energetic component @ the shell layer energetic component. The core-shell structure prepared in the invention can substantially reduce the friction sensitivity and the characteristic fall height of the core layer energetic component and maintain a high energy level, and the preparation method has the advantages of simple process, mild conditions and good safety.
Owner:INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS

Lithium manganate composite positive electrode material, a preparing method thereof and a lithium-ion battery

The invention provides a lithium manganate composite positive electrode material, a preparing method thereof and a lithium-ion battery. The composite positive electrode material is of a core-shell structure. The inner layer of the composite positive electrode material is an in-situ composite of lithium manganate and nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate LiMn2O4-LiNi1-x-yCox(Al/Mn)yO2, wherein x is more than 0 and less than or equal to 0.25, and y is more than 0 and less than or equal to 0.15; the outer shell of the composite positive electrode material is a metal oxide coated layer. According to the lithium manganate composite positive electrode material and the preparing method thereof, the in-situ composite of lithium manganate and nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate is obtained after in-site sintering of a manganese source, a nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate precursor, and a lithium source, then shell-layer metal oxide is cladded by using spray drying, and finally the composite positive electrode material is obtained by combining a microwave sintering process. The composite positive electrode material provided by the invention has relatively high specific capacity, and excellent high temperature cycling and storage performances.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Graphene/solid-state electrolyte composite coated silicon composite negative electrode and preparation method thereof

The invention discloses a graphene / solid-state electrolyte coated silicon composite material and a preparation method thereof. The preparation method comprises the following steps: coating a silicon-based material with a layer of graphene through a chemical vapor deposition method, and accumulating concentrated ammonia water into an oxide through a precursor ester of an oxide for coating to obtainan oxide and graphene co-coated silicon negative electrode material; performing lithiation on the composite material with lithium hydroxide monohydrate to finally obtain the graphene / solid-state electrolyte coated silicon composite material. In the composite material, graphene directly grows on the surfaces of silicon particles, and the surface of graphene is coated with solid-state electrolyte,thereby forming double-layer coating. The graphene inside can increase the electronic conductivity of the silicon-based material, and relieve volume expansion of silicon. The coating solid-state electrolyte outside can improve the Coulomb efficiency and the magnification performance of the silicon-based negative electrode material, reduce the electrochemical reaction between the negative electrodematerial and electrolyte, increase the Coulomb efficiency of the silicon-based negative electrode and improve the high current charging and discharging performance of the material.
Owner:深圳索理德新材料科技有限公司

Conducting-polymer dipped and coated lithium-ion battery composite-electrode material and preparation method thereof

The invention provides a conducting-polymer dipped and coated lithium-ion battery composite-electrode material and a preparation method thereof. A high-polymer conducting polymer is coated on the lithium-ion battery electrode material of the composite electrode material, the conducting polymer is the conducting polymer which is easily dispersed into an aqueous solution, and the aqueous solution of dispersants, such as polystyrolsulfon acid and the like is used as a dispersing medium. The composite electrode material is prepared through the following steps of: dipping a lithium-ion anode material or cathode material into the aqueous solution of the high-polymer conducting polymer, and obtaining the surface-coated lithium-ion battery composite-electrode material through dipping and coating processing. The composite electrode material has cheap preparation raw materials, the surface of the novel composite electrode material is uniformly coated, and the composite electrode material has the advantages of high specific capacity, high charging and discharging efficiency and long cycling life. Compared with the prior art, the preparation method of the composite electrode material has the advantages of simple process, low cost, good effect and green and environment-friendly production process, is easy for industrial popularization and is convenient for large-scale industrialized production.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

Carbon ceramic braking pad for high-speed train and preparation method of carbon ceramic braking pad

ActiveCN103511525ALess impact on friction and wear propertiesHigh and stable coefficient of frictionFriction liningFiberCeramic composite
The invention relates to a carbon ceramic braking pad for a high-speed train and a preparation method of the carbon ceramic braking pad. The carbon ceramic braking pad is made of carbon ceramic composite material; the carbon ceramic composite material comprises the following components in percentage by mass: 16-30 percent of carbon fibers, 20-36 percent of pyrolytic carbon, 28-46 percent of silicon carbide, 6-12 percent of molybdenum disilicide and 2-6 percent of simple substance silicon; the density of the carbon ceramic composite material is 1.8-2.4g/cm<3>; the carbon fibers are uniformly distributed in the carbon ceramic composite material in a three-dimensional network structure. According to the invention, after the high-temperature heat treatment is performed on a carbon fiber felt with the density of 0.20-0.65g/cm<3>, the pyrolytic carbon is generated in the carbon fiber felt through the thermal-gradient chemical vapor deposition carburizing treatment, then the catalytic graphitization treatment, non-immersion type melting infiltration and assembly are performed, so that the carbon ceramic braking pad for the high-speed train is obtained.The carbon ceramic braking pad is simple in preparation technology, moderate in friction coefficient, good in abrasion performance, stable in braking and strong in environmental suitability and can meet braking requirements of the high-speed train with the speed of 200Km/h.
Owner:HUNAN SHIXIN NEW MATERIALS CO LTD

Method for preparing high-nickel long-cycle single-crystal lithium ion battery positive-pole material

The invention relates to a method for preparing a high-nickel long-cycle single-crystal nickel-cobalt-manganese (NCM) lithium ion battery positive-pole material. The preparation method comprises the following steps: (1) mixing a soluble nickel salt, a cobalt salt, a manganese salt, an alkali metal hydroxide and ammonia water, and enabling the mixture to flow into a reaction kettle for constant-temperature coprecipitation to obtain a high-nickel NCM ternary precursor material; (2) uniformly mixing the high-nickel NCM ternary precursor, lithium hydroxide and an additive A in a wet high-speed mixing mode, carrying out drying, then carrying out primary sintering in an oxygen-enriched atmosphere to obtain a spherical high-nickel NCM ternary positive-pole material; (3) carrying out crushing, smashing and sieving to obtain a high-nickel NCM ternary positive-pole material; and (4) carrying out wet mixing and drying on the high-nickel NCM ternary positive-pole material with a coating agent B, carrying out secondary sintering in an oxygen-enriched atmosphere, and carrying out crushing, smashing and sieving to obtain the high-nickel single-crystal NCM lithium ion battery positive-pole material. The positive-pole material prepared by the method has the advantages of high capacity, good cycle performance, high compaction density and the like.
Owner:ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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