80results about How to "Avoid chalking" patented technology

The invention belongs to the technical field of lithium ion batteries, and discloses an amidated polyacrylic acid water-based polymer binder for a silicon-based negative electrode of a lithium ion battery and a preparation method and application of the amidated polyacrylic acid water-based polymer binder for the silicon-based negative electrode of the lithium ion battery. The preparation method comprises the following steps: under a protective atmosphere, sequentially adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, N-hydroxysuccinimide and levodopa, stirring to fully react, carrying out dialysis freeze-drying treatment to obtain a primary product PL, and uniformly mixing the PL with glycerol to obtain the product. According to the binder, a dynamic bond is successfully introduced, the transportation efficiency of lithium ions is improved, a three-dimensional network structure is constructed, adverse stress generated by volume expansion of a SiOx negative electrode material in the charging and discharging process of an electrode can be effectively inhibited, and the SiOx negative electrode shows good cycling stability.

The invention discloses a lithium ion battery negative electrode with low expansion and low impedance. The lithium ion battery negative electrode comprises a composite current collector and a negative electrode active material coating coated on at least one surface of the composite current collector, the negative electrode active material coating comprises a negative electrode active material, graphene and lithium polyacrylate; the mass ratio of the negative electrode active material to the graphene to the lithium polyacrylate is (90-99): (0.5-5): (0.5-5), the negative electrode active material comprises a silicon carbon material and a coating material layer arranged on the outer surface of the silicon carbon material, and the coating material layer comprises a polypyrrole layer and single-walled carbon nanotubes uniformly distributed in the polypyrrole layer. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has the advantages of low expansion and low impedance, and can effectively inhibit the expansion of silicon particles, reduce the internal resistance of the battery and maintain the structural stability of the electrode.

The invention discloses a coating liquid and a photovoltaic front panel. The coating liquid comprises a component A and a component B, the component A comprises the following raw materials in parts by weight: 15-35 parts of fluorocarbon resin; 20 to 40 parts of acrylic resin; 1 to 10 parts of matting resin; 1 to 5 parts of an ultraviolet absorbent; the component B comprises a curing agent, and the curing agent comprises-NCO groups. Therefore, when the coating liquid disclosed by the invention is coated on the photovoltaic front panel, powdering of the photovoltaic front panel caused by long-term ultraviolet irradiation can be effectively resisted, and meanwhile, the coating also has excellent scratch resistance, light transmission and water vapor barrier rate.

The utility model belongs to the technical field of carbon dioxide capture, and discloses a carbon dioxide adsorption device capable of supplementing organic amine on line, which comprises a shell, a bottom partition plate, a solid amine adsorbent, a liquid filling pipe and a spray pipe, the solid amine adsorbent is stacked on the horizontally arranged bottom partition plate, and a vertical axial spiral blade is arranged on the bottom partition plate. The spiral blade separates the solid amine adsorbent to form a spiral flow channel, the liquid filling pipe penetrates through the center of the spiral blade, the spray pipes are evenly arranged along the upper surface of the spiral blade, the spray pipes spray an organic amine solution to the solid amine adsorbent, the liquid filling pipe is communicated with all the spray pipes, and an inlet in the upper end of the liquid filling pipe is communicated with a liquid storage tank of the organic amine solution through a solution input pipe. And the solution input pipe is connected with an input pump. According to the utility model, the flow length of carbon dioxide gas passing through the solid amine adsorbent can be increased under the condition that the volume is limited, the solid amine adsorbent can be continuously impregnated in the adsorption device, regeneration equipment does not need to be additionally purchased, excessive impregnation liquid does not need to be used, and the cost is reduced.

The present invention belongs to the technical field of battery negative electrode materials, and specifically relates to a tin oxide-based composite negative electrode material and its preparation method and use. The in-situ synthesis method of the present invention can enhance the bonding force between SnO2 particles, porous carbon skeletons, and carbon nanotubes, making them a firmly bonded whole. The composite negative electrode material can withstand the stress generated by the volume change of tin oxide, constrain and buffer the volume change of tin oxide, reduce the volume expansion multiple of tin oxide after cyclic charge and discharge, and further prevent the pulverization of the composite negative electrode material; at the same time, it can also improve the conductivity of the composite negative electrode material and improve the electrochemical performance of the negative electrode material.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a silicon-carbon negative electrode material, a preparation method thereof, a negative electrode plate and a lithium ion battery. The silicon-carbon negative electrode material comprises a composite fiber, wherein the composite fiber comprises a core layer and a carbon coating layer; the core layer has a pore structure and comprises a carbon skeleton and a silicon material; in the cross section of the composite fiber, the area of the pore structure is S pore, the area of the silicon element is S silicon, the area of the carbon element is S carbon, and 0.5 < = S pore / (S silicon + S carbon) < = 2. The silicon material in the core layer can provide higher gram volume, and the carbon skeleton can provide mechanical strength and enhance the conductivity of the material; the core layer has a pore structure and can provide a buffer space when the silicon material is charged, so that the cycle performance is improved; the carbon coating layer can effectively reduce the specific surface area of the material, avoids direct contact between the silicon material and an electrolyte, and improves the initial coulombic efficiency; the silicon material can be ensured to have enough buffer space by meeting the relational expression, and the cycle performance can be further improved.

The invention belongs to the technical field of battery negative electrode materials, and particularly relates to a phosphorus-based negative electrode material with a coating structure as well as a preparation method and application of the phosphorus-based negative electrode material. On the basis of the prior art, nano nickel phosphide, red phosphorus and carbon nanospheres are subjected to ball milling to prepare a main body phosphorus-based material, and then the main body phosphorus-based material is coated with a coating layer prepared from a nanofiber material, pyrrole and 5-azaindole, so that the coating layer of the phosphorus-based negative electrode material has elasticity, the volume expansion rate of the phosphorus negative electrode material is reduced, and the service life of the phosphorus negative electrode material is prolonged. According to the nickel phosphide-based negative electrode material and the preparation method thereof, the interface interaction between the phosphorus-based negative electrode material and the binder is enhanced, the prepared nickel phosphide grows on the black phosphorus nanosheet, so that the nickel phosphide has good dispersity, the nickel phosphide nanocrystals can be effectively prevented from being agglomerated, and the energy storage capacity of the nickel phosphide is improved; and after the 5-hydroxy vanillin is grafted, the adhesive has excellent wet adhesion resistance, and can prevent the dissolution of phosphorus element, so that the cycle efficiency of the electrode is improved.

The invention relates to the technical field of organic polymer materials and the technical field of lithium batteries, in particular to polyimide and a preparation method and application thereof.The preparation method of the polyimide comprises the steps that in the inert gas atmosphere, a first solvent, a first monomer and a second monomer are subjected to a mixed reaction, pyridine and acetic anhydride are added, a reflux reaction is conducted, cooling is conducted, and the polyimide is obtained. And adding a second solvent, stirring, carrying out suction filtration, and drying. The polyimide is resistant to high temperature, the decomposition temperature is 500 DEG C or above, and the polyimide has good thermal performance, meanwhile, when the polyimide is applied to preparation of the lithium ion battery diaphragm in the form of nanofibers and nanoparticles, due to the fact that the polyimide has cohesiveness, the problem that the cohesiveness of a binder fails is solved, and due to the fact that the polyimide contains ether bonds and has higher affinity with electrolyte, the service life of the polyimide is prolonged. The wettability of the battery is improved; meanwhile, the polyimide is simple in preparation method, suitable for mass production and convenient for commercialized popularization.

The invention relates to the technical field of smelting, and discloses a dedusting ash cold-pressed pellet preparation method which comprises the following steps: S1, raw material preparation: firstly preparing required converter dedusting ash or gas ash, putting the raw materials into a raw material bin for use after the raw materials are prepared, and in order to ensure the iron element in the pellet and the stability of the pellet, preparing a raw material bin; wherein the fly ash or the gas ash with the total iron content of 55% is used. The fly ash anti-calcium oxide pellet adhesive has the advantages that after the fly ash anti-calcium oxide pellet adhesive and materials are stirred with water, high adhesion can be generated, a good adhesion effect is achieved, the pellet forming rate, the wet pellet anti-falling performance and the dry pellet compressive strength are improved, and secondly, the fly ash anti-calcium oxide pellet adhesive can be recycled. The fly ash anti-calcium oxide pellet adhesive can also inhibit the pellets from disintegration and pulverization in the drying or placing process, so that the cold strength of the pellets is improved, finally, the forming rate of the pellets is high, the fly ash pellets replace scrap steel to be put into a converter and used as a cooling agent, the reaction temperature in the converter can be reduced, and the whole steelmaking process is more stable.

The present invention relates to a negative electrode material, which comprises a hydrogen storage alloy and a coating layer arranged on the surface of the hydrogen storage alloy. Based on the mass of the negative electrode material, the content of the coating layer is ≥ 2wt%. The coating layer comprises a general formula LnF x The components shown in the figure, Ln is an element selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y and Sc. The present invention also relates to a method for preparing the negative electrode material. The present invention also relates to a nickel-hydrogen secondary battery using the negative electrode material.

The invention discloses efficient closed-pore high-stability slurry and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of lithium batteries, the efficient closed-pore high-stability slurry comprises water, core-shell microspheres, a heat stabilizer, a wetting auxiliary agent and a dispersing auxiliary agent, the core-shell microspheres comprise first core-shell particles and second core-shell particles, the core of the first core-shell particle is a mixture of a heat conducting agent and a flame retardant, or a composition of any one or more of the heat conducting agents, and the shell of the first core-shell particle is a mixture of a thermosensitive accelerator and a thermosensitive main agent, or a composition of any one or more of the thermosensitive accelerators; the core of the second core-shell particle is a mixture of a heat conducting agent and a flame retardant, or a composition of any one or more of the flame retardants, and the shell of the second core-shell particle is a mixture of a thermosensitive accelerator and a thermosensitive main agent, or a composition of any one or more of the thermosensitive main agents. The material has the advantages of early quick and synchronous response to temperature change, excellent thermal stability and excellent flame retardancy.

The invention relates to the technical field of carbon dioxide dealkylation, and discloses a catalyst for removing hydrocarbon impurities in carbon dioxide and a preparation method of the catalyst. According to the catalyst for removing hydrocarbon impurities from carbon dioxide, active components are loaded on composite carrier particles; the composite carrier particles are obtained by loading a catalytic promoter cerium oxide on composite aerogel, grinding and sieving; the composite aerogel is prepared from a coagulant aid and at least two aerogel precursors by a sol-gel method. The preparation method of the catalyst for removing hydrocarbon impurities in carbon dioxide comprises the following preparation steps: 1) preparing composite aerogel from an aerogel precursor and a coagulant aid through a sol-gel method; 2) soaking the composite aerogel in a cerium nitrate solution, naturally airing, drying, roasting, grinding and sieving to obtain composite carrier particles; and 3) dipping the composite carrier particles in a mixed solution of active components, standing, drying and roasting to obtain the catalyst for removing hydrocarbon impurities from carbon dioxide.

This invention discloses a dual-mode synergistic composite photocatalyst, its preparation method, and its application in styrene-acrylic emulsion coating compositions, belonging to the field of architectural coating technology. The dual-mode synergistic composite photocatalyst possesses a TiO2@dense SiO2@mesoporous SiO2-MnO2-GQDs three-layer core-shell structure. The styrene-acrylic emulsion coating provided by this invention utilizes the aforementioned dual-mode synergistic composite photocatalyst, and innovatively employs a yellowing-resistant composition composed of hollow titanium dioxide-supported phenyltriazole particles, a sulfonic acid-grafted hindered amine light stabilizer, and nano-zinc oxide. This composition synergistically inhibits yellowing of the paint film through enhanced UV absorption and improved interfacial compatibility. The styrene-acrylic emulsion coating provided by this invention successfully solves the two major problems of traditional photocatalytic coatings: "purification depends on light" and "self-catalysis leads to yellowing of the paint film." It can efficiently degrade formaldehyde under both light and dark conditions and exhibits excellent yellowing resistance.

This invention relates to a Ni-doped cobalt sulfide three-dimensional graphene anode material for sodium-ion batteries and its preparation method, belonging to the field of electrochemical energy storage. A NiCoCN precursor is obtained by grinding and mixing nickel nitrate, cobalt nitrate, and urea uniformly, followed by air annealing. The precursor is then mixed with a commercial graphene oxide solution, stirred, centrifuged, washed, and dried to obtain a NiCoCN / graphene oxide precursor. High-temperature sulfidation using thiourea as a sulfur source via vapor deposition yields the NiCoSCN@three-dimensional graphene anode material. When this anode material is applied to sodium-ion battery anodes, nickel doping improves the rate performance and long-cycle stability of the material. (5 A g) ‑1 After 400 cycles, the capacity retention is ≥80% at 10 A g. ‑1 After 1000 cycles, the capacity retention rate can still reach over 65%. This method has a simple preparation process and broad application prospects in the energy field.

The present application provides an aerogel thermal insulation putty paste, the raw materials of which include: by weight, 13-50 parts of emulsion, 30-70 parts of aerogel paste, 5-30 parts of filler, 0.1-2 parts of leveling agent, 0.1-3 parts of adhesion promoter, 0.1-1 parts of defoaming agent, 0.1-1 parts of bactericide, 0.1-1 parts of wetting dispersant, and 5-20 parts of water; the present application uses a high-density aerogel paste, and the prepared putty paste has excellent thermal insulation performance and flame retardant performance; at the same time, the mechanical strength of the putty paste is enhanced by using an emulsion with a high Tg value, and the flexibility of the cross-linking system of the putty paste is coordinated by compounding different emulsions to avoid cracking or powdering of the putty paste after curing, and the prepared putty paste has excellent bonding strength, fire resistance, hydrophobicity and construction performance.

The invention discloses a composite structure mass block for gravity energy storage and a rapid production method of the composite structure mass block. The composite structure mass block comprises a solidified muck core, a cement bonding layer, a stainless steel shell and a concrete bottom plate. The solidified muck core is of a cuboid structure which is horizontally and transversely arranged, stainless steel shells are vertically arranged on the side faces of the periphery of the solidified muck core in an aligned mode, the stainless steel shells and the corresponding side faces of the solidified muck core are arranged in a spaced mode, and the upper end and the lower end of each stainless steel shell are horizontally turned towards the direction of the solidified muck core to form a C shape. A cement bonding layer is filled between the solidified muck core and the stainless steel shell, and the gap between the stainless steel shell and the solidified muck core is completely filled through the cement bonding layer; a concrete bottom plate is horizontally arranged on the lower surface of the solidified muck core, a weight adjusting cavity is formed in the middle of the upper surface of the solidified muck core in an embedded mode, a plurality of through long hollow channels are formed in the upper surface of the solidified muck core relative to the periphery of the weight adjusting cavity in an embedded mode, and then the composite structure mass block is obtained after maintenance and weight compensation of the weight adjusting cavity. The manufacturing efficiency of the gravity energy storage mass block is improved.

The invention provides a lithium manganate positive electrode material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of batteries, the structural general formula of the lithium manganate positive electrode material is Li1 + xMyMn2-(x + y) O4, x is greater than or equal to 0.1 and less than or equal to 0.33, y is greater than or equal to 0.005 and less than or equal to 0.01, M comprises at least one of Co, Ni, Cr and Fe, and the 111 crystal face diffraction peak intensity I111 of the lithium manganate positive electrode material is greater than 3100. According to the lithium manganate positive electrode material, the energy density, the effective gram volume and the structural stability of the lithium manganate positive electrode material, especially the performance of the lithium manganate positive electrode material in a low-voltage range of 2.0-3.3 V, are improved through lithium enrichment, doping of a proper proportion of M elements and synergistic cooperation of 111 crystal face diffraction peak intensity of the lithium manganate positive electrode material, so that the energy density, the effective gram volume and the cycling stability of the battery are improved, and the battery performance is improved. The battery service life is prolonged.

The invention belongs to the technical field of solid-state batteries, and discloses an alloy ion / electron mixed conductor and application thereof. The mixed conductor is prepared by taking antimony powder, lithium powder or sodium powder and at least one metal powder of lanthanum, scandium, yttrium, aluminum, gallium and indium as raw materials through ball-milling mixing, tube sealing annealing and quenching treatment. When the mixed conductor is used as an interlayer of a lithium / sodium metal negative electrode and an electrolyte in the solid-state battery, the growth of lithium / sodium dendrites can be effectively inhibited through a specific nucleation mechanism, and the utilization rate of the metal negative electrode is improved; when the conductive additive is used as a conductive additive of a silicon, red phosphorus or graphite / hard carbon negative electrode material, by virtue of high ion / electron conductivity and good potential stability, the interface side reaction is reduced, and the rate capability and the cycling stability of the negative electrode material are remarkably improved.

The invention discloses a preparation process of high-strength crack-resistant plastering gypsum, comprising the following steps: (1) pre-treating glass fiber in hydrofluoric acid, separating the glass fiber after pre-treatment, placing the glass fiber in a mixture of concentrated sulfuric acid and hydrogen peroxide solution and letting it stand, and obtaining hydroxylated glass fiber after pre-treatment. (2) placing the hydroxylated glass fiber in ethanol containing nano-Ca(OH)2, adding a silane coupling agent, mixing well, heating and heat preservation in a sealed manner, and separating the fiber after pre-treatment, thereby obtaining a glass fiber anti-cracking agent. (3) taking at least the following raw materials: 110-135 parts by weight of gypsum powder, 20-30 parts by weight of the glass fiber anti-cracking agent, 25-50 parts by weight of dead-burned magnesium oxide powder, 8-14 parts by weight of dihydrogen phosphate, 1-3 parts by weight of magnesium bicarbonate, and 5-6.5 parts by weight of a retarder. After mixing the above raw materials well, adding water and a water reducing agent, and mixing well to obtain plastering gypsum. The process of the invention not only solves the problem of insufficient strength of plastering gypsum, but also improves the anti-cracking performance of plastering gypsum.

The invention relates to the technical field of electrochemical energy storage materials and preparation, and discloses a forestry and agricultural residue-based carbon material and application thereof in a zinc ion battery, the forestry and agricultural residue-based carbon material is prepared by taking forestry and agricultural residues as raw materials through cellulose extraction, three-dimensional skeleton construction through aerogel, high-temperature carbonization, potassium hydroxide activation pore-forming and electrochemical surface modification. The obtained carbon material has a three-dimensional hierarchical connected network structure composed of micropores, mesopores and macropores, and the surface of the carbon material is rich in oxygen-containing zinc-loving sites for inducing uniform deposition of zinc. When being used as a zinc-free negative electrode carrier of a zinc ion battery, the hierarchical pore structure effectively reduces local current density and buffers deposition volume expansion, and surface zinc-loving sites obviously reduce nucleation overpotential. Through cooperative regulation and control of a physical structure and surface chemistry, zinc dendrite growth and hydrogen evolution side reaction are effectively inhibited, coulombic efficiency, long cycle stability and rate capability of the battery are greatly improved, the process is controllable, and the cost is low.

This invention relates to the field of battery technology, and in particular to a modified negative electrode, a full cell, and a preparation method thereof. The modified negative electrode includes a negative electrode and a ceramic layer coated on the surface of the negative electrode; the ceramic layer includes a fast ion conductor, ceramic particles, and a binder. The ceramic layer of this invention employs a composition of a fast ion conductor, hollow ceramic particles, and a binder. The hollow ceramic particles provide mechanical strength and buffer space, the fast ion conductor provides an ultrafast lithium-ion transport channel, and the composite ceramic layer, incorporating the fast ion conductor and ceramic particles, provides the core requirements for stable mechanical support, stress buffering, and ion conduction at the silicon-doped negative electrode interface. This significantly improves the effectiveness of reducing interface wrinkles on the negative electrode sheet after formation, maintaining the integrity of the electrode structure between the coating and the current collector, and the active material particles.

The present invention discloses an amorphous stannous sulfide / nitrogen-doped carbon composite oriented tubular material and a preparation method and application thereof, belonging to the technical field of potassium ion battery materials. The stannous sulfide / nitrogen-doped carbon composite material is a porous oriented tubular structure. A carbon-forming nitrogen-containing polymer and a pore-forming polymer are added to a solvent to obtain a solution A. A tin salt is added to a solvent to obtain a solution B. The two are mixed to obtain an electrostatic spinning precursor solution. Through coaxial electrostatic spinning, an oriented nanotube negative electrode precursor is obtained. The stannous sulfide / nitrogen-doped carbon composite material is obtained after sulfurization, soaking, pre-carbonization and carbonization in sequence. The amorphous nature of stannous sulfide helps to improve the electrochemical stability. The nitrogen-doped porous carbon tube skeleton not only improves the conductivity of the composite electrode material, but also buffers the volume change of stannous sulfide during the charge and discharge cycle. The oriented structure accelerates the transmission speed of electrons and ions and improves the reaction kinetics.

The application discloses a kind of quasi-solid electrolyte systems containing two-dimensional fluorophlogopite nanosheet and its application in secondary battery.The quasi-solid electrolyte system has the mass fraction of 0.005% to 0.1% of exfoliated fluorophlogopite nanosheet dispersed in liquid base electrolyte, and cooperates with the use of separator coated with a composite coating containing the nanosheet.The nanosheet forms a thixotropic gel network with cations in the electrolyte through electrostatic interaction and coordination adsorption, migrates to the electrode microcrack through microscale convection during charging and discharging to produce bridging effect to inhibit volume expansion, while the separator coating uses the high aspect ratio of nanosheet to block metal dendrite penetration.The application is suitable for lithium ion batteries and sodium ion batteries, compatible with a variety of positive and negative electrode materials, significantly improves the cycle life, high voltage stability and safety performance.

This application relates to the field of all-solid-state lithium battery technology, disclosing an adhesive composition, electrode sheet, and all-solid-state battery for all-solid-state batteries. The composition includes 0.5-5.0 parts of a modified polymer adhesive and 95.0-99.5 parts of a non-polar organic solvent. The modified polymer has a hydrocarbon backbone and side chains containing 0.5-15.0 mol% nitrile or ester groups. The electrode sheet of this invention contains only 0.5-3.0 wt% adhesive and is prepared using a high-pressure hot-pressing process at 300-1000 MPa, resulting in a point-contact distribution of the adhesive at the microscopic level. This invention resolves the contradiction between adhesive solubility and the chemical stability of the sulfide electrolyte, achieving high peel strength and low interfacial resistance of the electrode with extremely low adhesive content. This effectively buffers the volume expansion of the active material, improving the cycle life, low-temperature performance, and rate performance of the all-solid-state battery.

The invention discloses an industrial waste gas VOCs adsorption device which comprises an adsorption barrel, a gas inlet pipe is arranged at the bottom end of the adsorption barrel in a penetrating mode, an exhaust pipe is arranged at the top end of the adsorption barrel in a penetrating mode, the gas inlet pipe and the exhaust pipe are symmetrically distributed, an adsorption part is arranged in the adsorption barrel, and a vibration part for pushing an adsorption part body to shake up and down is arranged in the adsorption barrel. The vibration part is arranged below the adsorption part, an activation part for accumulating gas entering the adsorption barrel from the gas inlet pipe and driving the vibration part to rotate through gas pressure is arranged in the adsorption barrel, and the activation part is arranged below the vibration part; the adsorption bed can slide up and down and collide and vibrate through the adsorption part, an airflow dead zone in the adsorption bed is effectively avoided, a granular adsorption material is prevented from forming a bridging structure due to extrusion, full contact of the adsorption material and VOCs waste gas is ensured, the effective utilization rate of an adsorbent and the purification efficiency of the device are improved, and the service life of the device is prolonged. Meanwhile, the outer frame of the adsorption bed abuts against the inner wall of the adsorption barrel, waste gas short circuit is avoided, and the purification effect is further guaranteed.

The invention discloses a recyclable valve-regulated lead-acid storage battery, lead paste and a preparation method of the lead paste, and relates to the field of lead-acid storage batteries. The lead paste comprises positive lead paste and negative lead paste which both contain short fibers compositely modified by carboxylic acid and silane monomers, and key components such as stannous oxide, zinc oxide, carbon black and lignin are added. The modified short fiber has the functions of acid affinity and storage, sulfuric acid conduction and structure enhancement, and has a synergistic effect with each component, so that the conductivity, the structural stability and the reaction activity of the lead plaster are remarkably improved, and the problems of reduced charging acceptance, quick capacity fading and short cycle life of the existing lead-calcium alloy storage battery are solved. The method is suitable for power cycle use scenes such as electric bicycles and electric tricycles, the cycle life of the storage battery can be prolonged, and the capacity stability is improved.

The invention belongs to the field of silicon-carbon negative electrode materials, and discloses a silicon-carbon negative electrode material, a preparation method and application thereof, and a lithium ion battery. The method comprises the following steps: (1) soaking a silicon source in a catalyst solution, filtering, drying, mixing with lithium hydroxide, and performing high-temperature pyrolysis in a mixed gas atmosphere to obtain a precursor; the mixed gas comprises inert gas, carbon source gas, reducing gas and'oxygen group-containing gas and / or nitrogen group-containing gas', the molar ratio of the silicon source to the lithium hydroxide is 100: (0.1-5), the flow ratio of the carbon source gas is 0.5-5%, and the flow ratio of the reducing gas is 0.5-5%; the temperature of high-temperature pyrolysis is 600 to 1050 DEG C; and (2) mixing the precursor and a solid carbon source, granulating and carbonizing. The silicon-carbon negative electrode material prepared by the invention can reduce the silicon expansion rate before and after charging and discharging and prolong the cycle life of the material.

The oxygen production adsorption tower comprises a flow guide section and an air flow uniform distribution section, the flow guide section is provided with a flow guide cavity, the air flow uniform distribution section comprises a flow guide uniform distribution body and a flow disturbing body, the flow guide uniform distribution body is provided with two openings to form the flow guide uniform distribution cavity, and the flow disturbing body is arranged in the flow guide uniform distribution cavity. Two opening ends of the flow guide body are fixedly connected with the flow guide section and the flow disturbing body respectively to form a structure that the flow guide cavity is communicated with the flow guide uniform distribution cavity, and a plurality of flow disturbing holes are formed in the flow disturbing body and are communicated with the flow guide uniform distribution cavity. The flow guide uniform distribution body plays a role in flow guide and also plays a role in dispersing and uniformly distributing airflow, the turbulent flow bodies and the turbulent flow holes can realize dispersion and uniform distribution of the airflow, and the situation that pulverization of the molecular sieve is accelerated due to the fact that the airflow directionally and directly impacts the molecular sieve at the bottom of the adsorption tower can be avoided; meanwhile, the turbulent flow bodies and the turbulent flow holes can reduce the gas flow speed, and the phenomenon that the oxygen concentration is reduced due to the fact that high-speed impact penetrates through a bed layer is avoided.

The invention belongs to the technical field of polyurethane synthesis, and particularly relates to a catalyst for synthesizing hard polyurethane and a preparation method of the catalyst. According to the catalyst, bismuth iso-octoate is taken as a matrix, hydroxypropyl methyl cellulose is firstly adsorbed on the surface of bismuth iso-octoate, and then 2-aminoterephthalic acid and bismuth iso-octoate are complexed at a certain temperature, so that the bismuth iso-octoate can better exert catalytic activity and selectivity, and the generation of byproducts is inhibited; furthermore, a polyurethane product has excellent mechanical properties, and the catalyst is more suitable for preparing a hard polyurethane material.

The present invention relates to the technical field of new energy batteries, and discloses a silicon-carbon-graphite negative electrode material and a preparation method thereof; a silicon-carbon-graphite negative electrode material, comprising an inner layer of SiO2, an outer layer of graphite, and g-C3N4 bonded between the inner layer and the outer layer. The present application utilizes a silicon-carbon-graphite negative electrode material forming a core-shell structure, and uniformly coats the surface of silicon dioxide with a graphite carbon layer, which can avoid contact with an electrolyte, thereby avoiding irreversible reactions generated during use. The present application bonds carbon nitride between nano-silicon dioxide and graphite, and utilizes the layered structure of carbon nitride to form a continuous, uniformly porous outward-spreading structure, which can well buffer the volume changes present during charge and discharge, and utilizes the structure of carbon nitride to further increase the specific surface area of ​​the negative electrode material. In addition, a tight bonding structure is formed between carbon nitride, silicon dioxide and graphite, which can avoid the pulverization and shedding problems of silicon materials, thereby improving the cycle stability of the electrode.