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1757results about How to "Ensure structural stability" patented technology

Lithium ion battery composite anode material and preparation method thereof

ActiveCN102244240ACan be firmly absorbedImprove stabilityCell electrodesCarbon compositesHigh rate
The invention discloses a lithium ion battery silicon carbon composite anode material and a preparation method thereof. The material is prepared by twice spray drying and once sintering. The preparation method comprises the following steps of: 1) dissolving an organic carbon source in an appropriate amount of solvent, adding a silicon source and a dispersing agent for dispersing suspension uniformly, adding graphitized carbon for dispersing the suspension for a certain period of time, and performing primary spray drying on the uniformly dispersed suspension to obtain a spherical nucleus material; and 2) dissolving the organic carbon source in the appropriate amount of the solvent, adding the prepared spherical nucleus material, dispersing the suspension uniformly, performing secondary spray drying on the uniformly dispersed suspension to obtain powder, transferring the powder into a protective atmosphere for sintering, and performing furnace cooling on the powder to obtain the lithium ion battery composite anode material. The preparation method is simple and practicable and has high practicality; and the prepared silicon carbon composite material has the advantages of large reversible capacity, designable capacity, high cycle performance, high rate capability, high tap density and the like.
Owner:CENT SOUTH UNIV

Polycrystal high-nickel positive electrode material used for lithium ion battery and preparation method for polycrystal high-nickel positive electrode material

Disclosed is a polycrystal high-nickel positive electrode material used for a lithium ion battery. The polycrystal high-nickel positive electrode material comprises a base material with a layered structure and a coating layer which is arranged outside the base material and has a spinel structure; the general formula of the base material is LiNi<1-x-y>Co<x>M<y>O<2>, wherein M is at least one kind of Mn and Al; the coating layer is lithium manganese oxide; the mass percentage of the total impurity lithium on the surface of the base material is less than 0.085% based on the total mass percentage of the base material; the preparation method for the positive electrode material comprises the following steps of weighing Ni<1-x-y>Co<x>M<y>(OH)<2>, and mixing with a lithium source, then carrying out thermal treatment, cooling, crushing and sieving to obtain the base material; measuring the content of the residual impurity Li<2>CO<3> and LiOH on the surface of the base material, adding into the metal Mn compound according to the measurement result, and carrying out low-temperature thermal treatment in an oxygen atmosphere to obtain the polycrystal high-nickel positive electrode material used for the lithium ion battery. The polycrystal high-nickel positive electrode material provided by the invention has the advantages of low material alkalinity, low inflatable degree, excellent processing property and cycling performance, and the like.
Owner:HUNAN SHANSHAN NEW ENERGY CO LTD

Preparation method for composite cathode material of lithium ion battery

The invention discloses a preparation method for a composite cathode material of a lithium ion battery by means of spray drying pyrolysis treatment. The preparation method includes the steps: dissolving a first type of binder organic carbon source into solvent of a proper quantity, adding a silicon source, a second type of binder and a dispersing agent, dispersing uniformly, adding graphite, dispersing for a certain time, subjecting uniformly dispersed suspension to spray drying, and using the first type of binder organic carbon source to bond the silicon source, the graphite and the second type of binder particles into spherical or spherical-like forms to obtain a composite precursor; and transferring the precursor into a shielding atmosphere for sintering, heating the second type of binder to a certain temperature to be melted into a liquid crystal state, bonding the particle silicon source and the graphite into cores, subjecting the organic carbon source to pyrolysis at the high temperature to form a coating, and furnace cooling to obtain the carbon-silicon composite cathode material of the lithium ion battery. The preparation method is simple, easy in implementation and high in practicality. The carbon-silicon composite prepared by the method has the advantages of high reversible capacity, designable capacity, high circulating performance and high-current discharging performance, high tap density and the like.
Owner:CENT SOUTH UNIV

Modified composite material containing silicon-based material, preparation method thereof and use thereof in lithium ion battery

The invention discloses a modified composite material containing a silicon base material, which comprises a silicon base core and a polymer cladding layer covering the surface of the core, and a preparation method and use thereof in a lithium ion battery. The method comprises the steps of : 1) adding a polymer into a liquid solvent and dispersing to obtain a slurry; 2) adding a silicon-based material or a mixture of that silicon-based material and the carbon material into the slurry and mixing the solid and liquid; 3) removing the solvent to obtain a modified composite material containing a silicon-based material. As the polymer coat layer is introduced on the surface of the silicon base core, so that the electrolyte can be isolated and the side reaction of the electrolyte on the surface of the silicon base core can be prevented; the method can also improve the crushing, electrode pulverization and peeling of the silicon-based negative electrode material in the process of processing and using, and reduce the electrode crushing and peeling caused by the huge volume expansion of the silicon-based material in the process of charging and discharging, so as to achieve the purpose of stabilizing the electrode structure and improving the cell cycle performance.
Owner:JIANGSU TAFEL NEW ENERGY TECH CO LTD +2

Cellulose-based magnetic aerogel material and preparation method thereof

The invention discloses a cellulose-based magnetic aerogel material and a preparation method thereof. The method comprises the following steps: carrying out chemical modification, thereby obtaining high-activity amphoteric cellulose; firmly combining the amphoteric cellulose and a graphene oxide through electrostatic interaction and hydrogen bonding forces and the like to build a framework of the aerogel material. Disperse loading of a magnetic nano ferroferric oxide can be achieved by virtue of the advantages of high surface activity and super-large specific surface area; the structure uniformity and the stability of the magnetic aerogel of the amphoteric cellulose are ensured through the steps of cross-linking, freeze-drying and the like; the characteristics of high specific surface properties, good affinity, biodegradability and the like of the cellulose are kept by the magnetic aerogel; and the magnetic aerogel obtains high surface activity and superparamagnetic property, has the advantages of low cost, high strength, amphoteric characteristic, biocompatibility and the like, has the characteristics of high specific surface area, high loading capacity, high surface activity, intelligent positioning and the like, and has significant adsorption capacity on pollutants such as heavy metal ions and organic molecules.
Owner:HAIMEN ZHUOWEI TEXTILE CO LTD

Multi-layer thermal barrier coating and forming method thereof

The invention relates to a multi-layer thermal barrier coating. The coating comprises a base body, a binding layer and a ceramic top layer which are sequentially arranged from bottom to top, wherein the ceramic top layer consists of a vertical-crack-containing ceramic bottom layer with different microstructures, a porous intermediate ceramic layer and a compact ceramic top layer, which are sequentially arranged from bottom to top; the invention further provides a forming method of the multi-layer thermal barrier coating; the forming method comprises the following steps: providing the base body and the binding layer; forming the vertical-crack-containing ceramic bottom layer on the upper surface of the binding layer by plasma spraying; forming the porous intermediate ceramic layer on the upper surface of the vertical-crack-containing ceramic bottom layer by virtue of plasma spraying; forming the compact ceramic top layer on the upper surface of the porous intermediate ceramic layer by virtue of plasma spraying. The multi-layer thermal barrier coating containing different microstructures is formed by the vertical-crack-containing ceramic bottom layer, the porous intermediate ceramic layer and the compact ceramic top layer which are sequentially arranged from bottom to top, so that the multi-layer thermal barrier coating has a thermal cycle service life which multiple times that of the existing thermal barrier coating.
Owner:EAST CHINA UNIV OF SCI & TECH

Upward moving type movable formwork for continuous box girder construction

The invention discloses an upward moving type movable formwork for continuous box girder construction. The upward moving type movable formwork comprises a box girder body construction mold, a main beam, a nose beam and a rear sliding beam. The bottom of the box girder body construction mold is unfolded for box girder form removal or the bottom of the box girder body construction mold is closed so that a box girder can be poured. The main beam is supported on a middle supporting leg of the box girder and used for bearing the box girder body construction mold and driving the box girder body construction mold to move in the longitudinal direction of the box girder. The nose beam is supported on a front supporting leg of the box girder and used for guiding the main beam moving in the longitudinal direction of the box girder. The rear sliding beam is supported on the poured molded box girder and used for assisting the main beam in moving in the longitudinal direction of the box girder and being adjusted to be bent in the transverse direction of the box girder. The box girder body construction mold is suspended on the main beam, the nose beam is arranged at the advancing end of the main beam, and the rear sliding beam is arranged at the rear end of the main beam. Whole box girder pouring construction and mold movement are finished on the supporting legs and the poured molded box girder, the box girder body construction mold is opened from the bottom to form a folding span-crossing structure, and therefore the structural stability and safety of the whole formwork are guaranteed.
Owner:CCFEB CIVIL ENG

Conductive polymer-coated silicon-based negative electrode material and preparation method thereof

The invention discloses a conductive polymer-coated silicon-based negative electrode material and a preparation method thereof. The method comprises the following steps of adding sodium alginate to a water solution, and then stirring and dissolving the sodium alginate; adding a conductive polymer monomer to the completely dissolved sodium alginate solution and stirring evenly; adding taken nanometer silicon to a mixed solution and mixing evenly through an ultrasound method to obtain a silicon dispersion liquid; adding an initiator to the silicon dispersion liquid and carrying out polymerization reaction on the conductive polymer monomer to obtain the conductive polymer-coated silicon-based negative electrode material; and carrying out washing and drying and finishing preparation of a final product. A three-dimensional mesh structure is built by the conductive polymer, so that the conductive polymer-coated silicon-based negative electrode material has conductivity and also provides a certain accommodation space for volume expansion of the silicon; and the silicon is embedded into the mesh structure, so that the volume effect of the silicon is effectively relieved. Furthermore, the hydroxyl-containing sodium alginate is introduced, so that the structure stability of the overall silicon-based negative electrode material is strengthened.
Owner:SHENZHEN UNIV

Nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and preparation method thereof

The invention discloses a nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on chitosan and derivatives thereof and a preparation method thereof and belongs to the fields of electrochemistry and new energy resource materials. According to the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite anode material based on the chitosan and the derivatives thereof and the preparation method thereof, firstly the chitosan and the derivatives thereof are taken as carbon source and nitrogen source precursors, a hard template carbonization method is adopted to prepare nitrogen-doped porous carbon spheres; then a mild hydrothermal method is adopted to load cobaltous oxide nano particles to the nitrogen-doped porous carbon spheres, and then the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite material is obtained. The material synthesizes the structural features of the nitrogen-doped porous carbon spheres and the small-size effect advantages of the cobaltous oxide nano particles, and due to the expression of the synergistic effect of the nitrogen-doped porous carbon spheres and the cobaltous oxide nano particles, the prepared material shows higher reversible specific capacity, better cycling stability and more excellent large rate discharge performance than a commercial graphite material when used as a lithium ion battery anode material. The method is strong in operability, preparation conditions are mild, the requirement for equipment is not rigorous, and the preparation method is suitable for industrial production; the nitrogen-doped porous carbon sphere and cobaltous oxide nano-composite material prepared by the method has potential application value in electrochemistry fields including lithium ion batteries, supercapacitors and the like.
Owner:HUBEI ENG UNIV

Soft rock tunnel deformation control method based on anchor rod force analysis

The invention discloses a soft rock tunnel deformation control method based on anchor rod force analysis. A soft rock tunnel is excavated and subjected to deformation control construction from back to front according to multiple segments, and when any segment is excavated and subjected to deformation control construction, the method includes the steps that 1, surrounding rock basic mechanical parameters are determined; 2, the tunnel reserved excavated volume is determined; 3, the tunnel is excavated; 4, a tunnel preliminary bracing structure is determined; 5, tunnel deformation control construction is carried out, wherein in the tunnel preliminary bracing construction process, a flexible mold bracing structure is constructed from back to front; 6, a next segment is excavated and subjected to deformation control construction; 7, the step 6 is repeated multiple times till the full excavation and deformation control construction process of the soft rock tunnel is completed. The soft rock tunnel deformation control method is reasonable in design, convenient to achieve and good in use effect, the reserved excavated volume is determined according to the surrounding rock deformation condition of the soft rock tunnel, the flexible mold bracing structure is adopted for carrying out full-section bracing on the tunnel, the flexible mold bracing structure and the tunnel preliminary bracing structure are in coordination deformation, and deformation of the soft rock tunnel can be effectively controlled.
Owner:XIAN UNIV OF SCI & TECH

Sodion-embedded manganese dioxide nanometer sheet electrode as well as preparation method and application of electrode

The invention relates to a sodion-embedded manganese dioxide nanometer sheet electrode as well as a preparation method and an application of the electrode. The electrode can be used as the active material of a supercapacitor and comprises sodion-embedded manganese dioxide nanometer sheets evenly distributed on the surface of a foamed nickel substrate. The preparation method comprises the following steps of: (1) mixing sodium sulfate and manganese acetate to prepare an electrochemical deposition precursor solution; (2) setting up an electrochemical deposition platform through a three-electrode method and taking the foamed nickel substrate after pretreatment as a working electrode, a platinum electrode as a counter electrode and a saturated calomel electrode as a reference electrode; (3) soaking the electrodes in the electrochemical deposition precursor solution at same depth; (4) opening an electrochemical workstation, setting the working electrode to the anode, setting the working mode to a timing potential mode, and starting up the electrochemical workstation; (5) taking out and washing the working electrode after the electrochemical workstation stops working; and (6) drying to obtain the sodion-embedded manganese dioxide nanometer sheet electrode. The sodion-embedded manganese dioxide nanometer film electrode as well as the preparation method and the application of the electrode disclosed by the invention have the characteristics of simple technique, mild reaction condition and excellent electrochemical performance of materials.
Owner:WUHAN UNIV OF TECH

3D (three-dimensional) printing powder delivery and paving linkage type bidirectional powder paving device and equipment

The invention relates to a 3D (three-dimensional) printing powder delivery and paving linkage type bidirectional powder paving device. The 3D printing powder delivery and paving linkage type bidirectional powder paving device comprises a worktable, a powder paving driving device, and a powder paving device, wherein the powder paving device is of a powder delivery and paving linkage structure and comprises a powder bin, a powder falling closing area, a quantitative powder delivery area and a powder paving part; the powder falling closing area is arranged at the bottom part of the powder bin, and a powder falling closing shaft is arranged in the powder falling closing area; a detachment and installation structure is arranged between an end cap of the powder bin and the bottom part of the powder bin; a powder bin pressing rotary button is arranged above a roller cylinder in the quantitative powder delivery area and is used for fixing the powder bin and the roller cylinder, a quantitative powder delivery roller is arranged in the quantitative powder delivery area, a powder falling port is arranged under the quantitative powder delivery roller, and the roller cylinder is detachably connected with the bottom part of the powder bin; a powder delivery and paving separation structure is arranged between the powder delivery and paving linkage structure and the powder paving driving device; the powder paving part is arranged at both sides of the roller cylinder, and each side is provided with a scraping knife. The 3D printing powder delivery and paving linkage type bidirectional powder paving device has the advantages that the whole structure is stable, the efficiency is improved by double scraping knives, the bidirectional powder paving function is realized, the aligning process of powder delivery and powder paving in working is not needed, the powder control accuracy is high, and the powder lifting and snapping are avoided; the structure is simple, and the detachment and cleaning are convenient.
Owner:安徽泰尔控股集团有限公司

Porous graphene supported carbon coated iron oxide nanoparticle composite material and preparation method thereof

The invention belongs to the technical field of lithium ion battery materials, and specifically relates to a porous graphene supported carbon coated iron oxide nanoparticle composite material and a preparation method thereof. The porous graphene supported carbon coated iron oxide nanoparticle composite material is prepared from the following steps: (1) directly preparing graphene oxide with graphite ore as a raw material by using a closed oxidation method; (2) preparing a ferric salt aqueous solution, wherein the specific steps are as follows: weighing and dissolving cetyl trimethyl ammonium bromide in water to obtain a clear cetyl trimethyl ammonium bromide solution, adding a ferric salt, stirring until the ferric salt is completely dissolved, and adding an ammonia solution to prepare the ferric salt aqueous solution; and (3) stirring and ultrasonic mixing the graphene oxide solution with the ferric salt aqueous solution, placing the mixture in a water bath kettle, reacting at 80-100 DEG C for 0.5-5h, stewing at a room temperature, removing clear liquid, freeze drying a head product, and carrying out heat treatment on the head product in an inert atmosphere to obtain the porous graphene supported carbon coated iron oxide nanoparticle composite material.
Owner:SHANXI UNIV

Pipe-jacking construction method for mealy sand stratum

The invention discloses a pipe-jacking construction method for a mealy sand stratum. The pipe-jacking construction method for the mealy sand stratum comprises the steps that firstly, a working well is constructed, specifically, the working well used for jacking a constructed underground pipeline is constructed, the constructed underground pipeline is formed by splicing a plurality of pipeline assembly sections from front to back, and a steel bushing head tool pipe comprises a steel sleeve, a supporting ring mounted on the inner side of the rear end of the steel sleeve, and an insertion opening fixed to the supporting ring; secondly, jacking equipment is mounted, specifically, the jacking equipment is mounted at the bottom of the inner side of the working well; thirdly, the steel bushing head tool pipe is jacked through the process that the steel bushing head tool pipe is hoisted in place, the steel bushing head tool pipe is jacked, and manual intra-pipe earth cutting is conducted; fourthly, the pipeline is jacked, specifically, the multiple pipeline assembly sections of the constructed underground pipeline are jacked from front to back; fifthly, a pipeline port is treated; and sixthly, a closed water test for the pipeline is conducted. According to the pipe-jacking construction method for the mealy sand stratum, the steps are simple, the design is reasonable, construction is easy and convenient, and the using effect is good; and a pipe-jacking construction process of the mealy sand stratum can be completed easily, conveniently and rapidly, and the construction process is safe and reliable.
Owner:中铁二十局集团第五工程有限公司

Machine jellyfish driven by embedded type cylindrical motor

ActiveCN104149953AEffectively control the movement positionAchieve continuous advancementPropulsive elements of non-rotary typeElectricityAbdominal cavity
The invention relates to a machine jellyfish, in particular to a machine jellyfish driven by an embedded type cylindrical motor. The problem that an existing bionic jellyfish robot is limited in moving range, small in effective water spraying size and small in driving force and is not suitable for a complex water flow environment in nature is solved. A mechanical abdominal cavity end cover, a sleeve and a bottom disc base of the machine jellyfish are in sealing connection from top to bottom in sequence. A cylindrical traveling wave ultrasonic motor is arranged on the bottom disc base. A transmission cam is located in the middle of the cylindrical traveling wave ultrasonic motor. A plurality of piezoelectric ceramic pieces are evenly distributed on the outer cylinder wall of the cylindrical traveling wave ultrasonic motor. A plurality of rectangular bosses which are arrayed vertically are evenly distributed on the inner cylinder wall of the cylindrical traveling wave ultrasonic motor. The other end of each arm pushing force rod is connected with a multi-joint arm. Each arm pushing force rod and the sleeve are connected through a pushing force rod guiding flange. An auxiliary spring is arranged between each pushing force guiding flange and an arm pushing force rod close to one side of a double-idler-wheel part. The machine jellyfish is used for unmanned underwater carrying.
Owner:HARBIN INST OF TECH
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