209 results about "Silicon oxygen" patented technology

The invention belongs to the technical field of lithium battery silicon-oxygen negative electrode materials, and particularly relates to a porous carbon carrier for a lithium battery silicon-oxygen negative electrode and a preparation method, the preparation method comprises the following steps: 1) pretreating raw oil to obtain a low-condensation-degree carbon-rich precursor; 2) performing oxidation crosslinking treatment on the low-condensation-degree carbon-rich precursor to obtain a heavy condensation polymer; 3) carrying out multistage supercritical extraction separation on the heavy condensation polymer to respectively obtain a component A, a component B and a component C, and drying and mixing the component A, the component B and the component C to obtain a carbon carrier precursor; 4, the carbon carrier precursor is subjected to pre-oxidation, etching and carbonization, and the porous carbon carrier for the silicon-oxygen negative electrode is obtained.The prepared porous carbon carrier for the silicon-oxygen negative electrode of the lithium battery has the advantages of being small in density, light in mass, reasonable in pore size distribution, high in specific surface area and excellent in conductivity.

The invention discloses a radiation refrigeration coating as well as a preparation method and application thereof, and relates to the technical field of material preparation. The preparation method comprises the following steps: sintering hexagonal boron nitride, and removing boron oxide to obtain modified boron nitride powder; the preparation method comprises the following steps: reacting supramolecular polysiloxane with methoxypolyethylene glycol to obtain hyperbranched polysiloxane; the modified boron nitride powder and hyperbranched polysiloxane are subjected to hydrolysis on boron nitride under the alkaline condition, and silane modified boron nitride is obtained; the silane modified boron nitride is added into a polyurethane coating matrix to form the radiation refrigeration coating. The silicon-oxygen modified group is introduced to the surface of the boron nitride, so that the interaction between the boron nitride and the coating group is greatly improved, and the stability of the coating is improved; the coating can be cured under different environmental conditions, and construction on power equipment is facilitated; the formed radiation refrigeration coating is high in sunlight reflectivity, high in mid-infrared emissivity and high in heat dissipation capacity for power equipment.

The invention provides a secondary battery and an electrochemical device, and relates to the field of electrochemical energy storage. The secondary battery comprises an electrolyte and a negative pole piece, the electrolyte comprises a first substance, and the first substance comprises at least one of compounds with a structure as shown in a formula I; the negative pole piece comprises a negative pole material layer; the negative pole material layer comprises carbon black, single-walled carbon nanotubes, carbon fibers and a silicon-based material; the silicon-based material comprises at least one of a silicon-carbon material, a silicon-oxygen material, a silicon alloy material and a pure silicon material. According to the secondary battery, the electrolyte is designed to contain a compound with a specific structure as shown in the formula I, the mass content of the compound is controlled to be 0.5%-30%, and meanwhile, the negative electrode material layer comprises carbon black, single-walled carbon nanotubes and carbon fibers, so that the high-temperature storage performance, the cycle performance and the high-low-temperature fast charging performance of an electrochemical device containing a silicon negative electrode are remarkably improved.

The invention relates to the technical field of silicon-oxygen negative electrode materials, in particular to a low-expansion-rate silicon-oxygen negative electrode material based on a porous carbon carrier and a preparation method thereof.The preparation method comprises the steps that 1, raw oil is pretreated to obtain a low-condensation-degree carbon-rich precursor; 2, sequentially carrying out oxidation crosslinking, molecular cutting, pre-oxidation and activation treatment on the low-condensation-degree carbon-rich precursor to obtain a porous carbon carrier; and step 3, taking the porous carbon carrier as a substrate, and carrying out vapor deposition and pyrolysis treatment to obtain the low-expansion-rate silicon-oxygen negative electrode material. According to the invention, the porous carbon carrier is used as the substrate, and the silicon-oxygen negative electrode material is obtained through vapor deposition and pyrolysis treatment, and has the characteristics of low expansion rate, good cycle stability and the like.

The invention relates to the technical field of batteries, in particular to a silicon-carbon composite material, a preparation method thereof, a negative plate and a battery. The provided silicon-carbon composite material comprises: an inner core, the inner core comprising silicon carbon; the middle layer is coated on at least part of the surface of the inner core, and the middle layer comprises silica; the first carbon coating layer is coated on at least part of the surface of the middle layer; and the second carbon coating layer coats at least part of the surface of the first carbon coating layer. The negative plate comprises the silicon-carbon composite material. The silicon-carbon composite material disclosed by the invention has good dimensional stability, and is faster in lithium ion diffusion and better in dynamics than an unmodified silicon-carbon material, the resistance of an electrode plate is lower, and the charge-discharge and rate capability of an electrode under high current density can be optimized.

The invention provides a dry-method negative pole piece as well as a preparation method and application thereof. The dry-method negative pole piece at least comprises a negative pole current collector, a positive pole piece and a negative pole piece, the dry-method negative electrode active layer is at least arranged on the surface of one side in the thickness direction of the negative electrode current collector, the dry-method negative electrode active layer comprises a negative electrode active material, a conductive agent and a binder, and the uniformity of the binder in the dry-method negative electrode active layer is 85%-96%; the negative electrode active material comprises a silicon material, and the silicon material comprises but is not limited to silicon, a silicon carbon material and a silicon oxygen negative electrode material. According to the dry-method negative pole piece as well as the preparation method and the application thereof provided by the invention, the expansion of the negative active material can be inhibited, and the safety performance can be improved.

The application relates to the technical field of lithium ion battery materials, and discloses a low-expansion silicon-carbon material and a preparation method thereof. The low-expansion silicon-carbon material has a porous core-shell structure, the inner core is graphene / metal-doped amorphous carbon-coated nano silicon, and the shell is boron-doped amorphous carbon. The preparation method comprises the following steps: firstly, a silicon oxide compound, a graphene oxide solution and an organic metal polymer are added into an organic carbon source solution, spray drying is carried out, and an oxidized graphene-coated metal-doped silicon oxide precursor material is obtained through reaction; secondly, a mixed gas of a boron source gas and argon is introduced into the oxidized graphene-coated metal-doped silicon oxide precursor material, and a boron-doped silicon-carbon composite material is obtained through reaction; and thirdly, the boron-doped silicon-carbon composite material is soaked in a hydrofluoric acid solution, and the low-expansion silicon-carbon material is obtained after drying. Through the technical scheme, the problems of high expansion and poor rate performance of the silicon-carbon material in the related art are solved.

The invention discloses a method for in-situ growth of SiOx in a carbon nanotube cluster by using a liquid phase method and application, and belongs to the technical field of functional materials. The method comprises the following steps: dissolving silane A and silane B in a hydrochloric acid solution to obtain a silane mixed solution; the preparation method comprises the following steps: dispersing carboxylated carbon nanotubes in deionized water to obtain a carbon nanotube dispersion liquid; adding the carbon nanotube dispersion liquid into the silane mixed solution, stirring and mixing, aging at normal temperature, collecting a precipitate, and drying; and carrying out high-temperature pyrolysis carbonization on the dried product in an inert gas atmosphere to obtain the CNTs (at) SiOx-F (at) C composite material. The carbon nanotubes in the obtained material are intertwined to form a cluster structure due to the crosslinking effect of silane, and SiOx grows on the tube walls of the carbon nanotubes in clusters. The special structure has a rapid electron and ion conduction channel, and internal gaps can relieve volume expansion in the SiOx circulation process, so that the comprehensive electrochemical performance of the silicon-oxygen negative electrode in the lithium ion battery is improved.

The invention provides a method for machining a straight micro through hole in glass through ultrafast laser and a machining system. The method comprises the following steps that three glass workpieces are bonded into a sandwich type workpiece through an optical cement technology; the Bessel beam is focused on the sandwich type workpiece by adjusting the length of the Bessel beam; ultrafast laser irradiates the sandwich type workpiece, so that the material structure of the inner area of the glass is converted into a silicon-oxygen three-membered ring or a silicon-oxygen four-membered ring from a silicon-oxygen six-membered ring, and the sandwich type workpiece with a vertically-through modified microarray area inside is obtained after processing; the sandwich type workpiece after laser processing is separated through the optical cement removing technology, and only the target workpiece in the middle is reserved; putting a target workpiece into an etching solution, introducing ultrasonic oscillation for etching, and corroding a silicon-oxygen three-membered ring or a silicon-oxygen four-membered ring in an internal modified microarray region by an etching agent to form a micro through hole; and cleaning the etched target workpiece. The appearance of a horn mouth can be avoided.

The invention relates to a preparation method and application of an alkali-activated iron tailing geopolymer adsorbent. According to the method, an iron tailing geopolymer is prepared through an alkali activation method, that is, an aluminosilicate structure in iron tailings is destroyed in an alkali activation mode, so that silica tetrahedron and alumina tetrahedron structures of the iron tailings are reconstructed, and a geopolymer material with adsorption capacity is prepared; on the basis, a foaming agent hydrogen peroxide solution is introduced to adjust the performance, and parameters such as modulus, water cement ratio and curing temperature of the alkali activator are respectively adjusted to prepare an optimal sample. The iron tailing geopolymer adsorbent material which is high in adsorption rate and good in stability is obtained, and the effect of adsorbing residual ciprofloxacin in wastewater is remarkable.

The present invention discloses a lithium ion battery negative electrode material, the components and the mass fractions of the components are as follows: 88-105 parts of active material, 0.01%-0.1 parts of single-walled carbon nanotubes, 0.01%-0.5 parts of graphene nanoribbons, less than 1 part of super conductive carbon black, less than 1 part of few-walled or multi-walled carbon nanotubes, 0.05-0.5 parts of dispersant, 1-3 parts of thickener, 1-4 parts of binder, and 25-60 parts of solvent; the active material includes silicon oxide material SiO x and artificial graphite, of which 0

The invention provides a mesoporous silicate molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieves. The framework component of the mesoporous silicate molecular sieve provided by the invention is only silica, 14 kinds of topology independent atoms are contained in the framework, a 36-membered ring one-dimensional mesoporous channel system is contained in the crystal structure of the mesoporous silicate molecular sieve, and the material is good in thermal stability and can be applied as a catalyst or an adsorbent.

The application relates to the technical field of battery materials, and particularly discloses a silicon-oxygen negative electrode material, a preparation method and application thereof. The silicon-oxygen material is coated by adopting a'secondary ethyne carbon coating' process, the deposition conditions of ethyne cracking are accurately controlled, the fluorides remaining on the surface of the active substance are fully coated by the secondary carbon layer, direct contact between the fluorides and the electrolyte is isolated, and the high-temperature storage stability of the material is significantly improved. The battery prepared by adopting the material provided by the application has a highest high-temperature storage initial efficiency of 71%, and the high-temperature storage capacity retention rate of a comparative sample (fluoride exposure) without secondary ethyne carbon coating treatment is only 61%. It is shown that the growth range of the interface impedance of the material provided by the application is significantly reduced after high-temperature storage, and it is shown that the interface side reaction is effectively inhibited.

Embodiments of the present application provide a silicon-based composite negative electrode material, a preparation method thereof, a negative electrode sheet and a secondary battery. The preparation method comprises: preparing a precursor fiber by electrospinning a precursor dispersion liquid containing a first silicon source, a second silicon source, a first carbon source and a second carbon source; and obtaining the silicon-based composite negative electrode material by heat treatment of the precursor fiber; the first silicon source is silicon particles; the second silicon source carries one or more of a silicon halogen bond, a silicon oxygen bond and a silicon hydrogen bond in a molecular structure; the first carbon source is a high molecular compound; and the second carbon source is an oxygen-containing small molecule organic compound. The present application adds two silicon sources and oxygen-containing group organic compounds to the spinning precursor dispersion liquid, so as to improve the structural stability and electrochemical performance of the silicon-based negative electrode material, thereby achieving the technical effects of inhibiting volume expansion while ensuring high capacity, significantly improving the cycle stability and safety, and simplifying the preparation process and reducing the cost.

According to the preparation method, the surface of the silica material is coated with the carbon layer by using the solid-phase carbon source, then the carbon nanotubes are grown on the surface of the carbon coating layer in situ by using chemical vapor deposition, the carbon nanotubes are uniformly distributed on the surface of the carbon coating layer and are tightly combined, and a three-dimensional conductive network constructed on the surface of the carbon layer by the carbon nanotubes not only greatly improves the conductivity of the material, but also improves the conductivity of the material. When the composite material is applied to the lithium ion battery, the rate capability and the cycle performance of the lithium ion battery are obviously improved; in addition, no catalyst is used during in-situ growth of the carbon nanotubes, so that the subsequent step of removing the catalyst can be omitted, and the preparation method is simple and low in cost.

The invention discloses a silicon-oxygen negative electrode material, a preparation method of the silicon-oxygen negative electrode material, a negative electrode plate and a lithium ion battery, and relates to the technical field of batteries. The first coating layer is distributed on the surface of the silicon-based material in a discontinuous island-shaped structure; and the second coating layer coats at least part of the surface of the first coating layer and the surface of the silicon-based material which is not covered by the first coating layer through molecular layer deposition. According to the silicon-oxygen negative electrode material provided by the invention, the mechanical stability, the electrochemical performance and the interface durability of an electrode can be improved, so that the defects of single film coating in the aspects of volume expansion adaptability and conductivity are overcome.

The invention provides a silicon heterojunction cell, a preparation method and a photovoltaic module, and the method comprises the following steps: heating a pretreated substrate under a vacuum condition, and obtaining a heated substrate; sequentially growing an intrinsic amorphous silicon passivation layer, n-type doped hydrogenated microcrystalline silica, a transparent oxide conductive film and a metal electrode on the front surface of the heated substrate by adopting a chemical deposition method; sequentially growing an intrinsic amorphous silicon passivation layer, three p-type selective contact layers, a transparent oxide conductive film and a metal electrode on the back surface of the heated substrate by adopting a chemical deposition method; the three p-type selective contact layers comprise a p-type hydrogenated microcrystalline silicon layer, a CO2 lightly doped p-type hydrogenated microcrystalline silicon oxygen layer and a CO2 heavily doped p-type hydrogenated microcrystalline silicon oxygen layer; the three p-type selective contact layers constructed by the invention can provide excellent conductivity, transmittance and contact performance, and the filling factor of the cell is improved, so that the photoelectric conversion efficiency of the cell is improved.

A silicon-coated oxidation-resistant copper includes a SiCuOx layer includes a silicon (Si)-oxygen (O)-copper (Cu) mixed layer formed by depositing silicon (Si). The silicon-coated oxidation-resistant copper includes: a copper layer; the SiCuOx layer including the silicon (Si)-oxygen (O)-copper (Cu) mixed layer formed on the copper layer; a first silicon (Si)-oxygen (O) mixed layer formed on the SiCuOx layer; a silicon (Si) layer formed on the first silicon (Si)-oxygen (O) mixed layer; and a second silicon (Si)-oxygen (O) mixed layer formed on the silicon layer (Si) layer.

The application discloses a silicon-oxygen-carbon composite material and a preparation method thereof, a negative electrode raw material, a negative electrode sheet and a lithium ion battery, and belongs to the field of electrode materials. The silicon-oxygen-carbon composite material comprises a core and an outer layer, and the outer layer comprises a carbon coating layer and a plurality of carbon protrusions. The core is a silicon-oxygen material doped with a metal. The carbon coating layer is coated outside the core, and the plurality of carbon protrusions are formed on the outer surface of the carbon coating layer. The silicon-oxygen-carbon composite material disclosed by the application can significantly improve the reversible capacity, the initial efficiency, the rate performance and the cycle stability of the lithium ion battery based on the synergistic effect of the metalized core, the carbon coating layer with uniform thickness and the plurality of carbon protrusions distributed outside the carbon coating layer.

The present invention relates to the technical field of polyethylene films, and discloses a preparation method of a high-strength polyethylene blown film. Metallocene polyethylene, maleic anhydride and octavinyl-POSS are used to initiate polymerization to obtain polyethylene grafted polyene POSS, which is subjected to epoxidation treatment to obtain polyethylene grafted epoxy POSS. Its structure consists of an inorganic cage-like nucleus formed by silicon oxygen, which has a rigid structure and steric hindrance effect, hinders the movement of polyethylene chain segments, can form nano-inorganic microphase regions, avoids a large amount of agglomeration of inorganic particles, and enables them to be evenly dispersed in the polyethylene matrix; PBAT itself has high toughness, belongs to polar molecules, has good moisture permeability, presents a two-phase separation state in the co-blown film, improves the water resistance of the polyethylene matrix, can selectively slow down the gas exchange between O2 and the outside world, avoids the condensation phenomenon in fruit and vegetable packaging, and has good biodegradability.

The invention relates to a self-stopping polishing composition and a method. A chemical mechanical polishing composition for polishing a substrate having a silica material, comprising, consisting of, or consisting essentially of: a liquid carrier; cubic ceria abrasive particles dispersed in the liquid carrier; a self-stopping agent; and a cationic polymer.

The invention relates to the technical field of photovoltaic waste silicon regeneration, in particular to a preparation method of a pre-magnesium-silicon-oxygen negative electrode material based on photovoltaic waste silicon recycling, which comprises the following steps: obtaining waste silicon materials from different sources, and immersing the waste silicon materials with the purity of 80-96% into an alkaline solution of a dehydrogenation additive to obtain a pure silicon wafer; soaking the pure silicon wafer in a hydrofluoric acid solution, adding a sodium hydroxide solution, soaking the common-purity silicon wafer in aqua regia, filtering the solution, and locally melting a silicon rod by adopting high-frequency induction heating to obtain high-purity silicon powder with the purity of 99.9999%; the mixture is added into a vacuum furnace to be heated, silicon monoxide steam and magnesium steam are obtained, and SiO / alpha Mg is obtained through condensation; and adding the SiO / alpha Mg material into a CVD (Chemical Vapor Deposition) furnace to obtain the Mg-SiOx-C composite material. According to the photovoltaic waste silicon disclosed by the invention, the pollution of the photovoltaic waste silicon to the environment is avoided, the secondary pollution easily caused by an immature recovery technology is avoided, the recovery cost is effectively reduced, and the utilization of the photovoltaic waste silicon is improved.

The present invention relates to the field of photovoltaic cell technology and provides a method for preparing a solar cell and a solar cell. The method for preparing a solar cell comprises: providing a silicon substrate having a first surface, the first surface comprising a plurality of spaced-apart first regions and a second region located between two adjacent first regions; forming a silicon oxide dielectric layer on the second region; sequentially forming a tunneling oxide layer and a doped polysilicon layer on the first surface, the tunneling oxide layer covering the first region and the silicon oxide dielectric layer, and the doped polysilicon layer covering the tunneling oxide layer; and patterning the doped polysilicon layer and the tunneling oxide layer to selectively remove the doped polysilicon layer and the tunneling oxide layer on the second region. This application solves the problem of poor passivation effect in high-efficiency cells using local contact technology.

The invention discloses a grain size controllable negative electrode and a preparation method thereof, and belongs to the technical field of secondary battery materials. The preparation method comprises the following steps: weighing raw materials according to a molar ratio of a lithium source to SiOx of 0.1-0.7, adding 5-10wt% of a carbon source (naphthalene), and uniformly mixing; and heating the mixed material to 600-800 DEG C at the speed of 1-10 DEG C / min in an inert gas atmosphere, and keeping the temperature for 2-10 hours to obtain the negative electrode material. Through in-situ carbon coating, the growth of silicon and lithium metasilicate grains is inhibited by using the high-temperature heat absorption characteristic of naphthalene, and meanwhile, the conductivity can be improved by an amorphous carbon layer formed by naphthalene carbonization; in the prepared negative electrode material, the grain size of silicon is 8-13nm, the grain size of lithium metasilicate is 9-20nm, the proportion of lithium metasilicate in the total lithium silicate is greater than or equal to 94%, and the capacity retention rate can reach 77.1-90.4% after 100 cycles at 0.5 C multiplying power. The preparation method is simple in process and suitable for industrialization, and the cycle performance and the first coulombic efficiency of the silicon-oxygen negative electrode can be remarkably improved.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a preparation method of a silica material composite covalent organic framework negative electrode material. Comprising the following steps: S1, activating the surfaces of silicon particles; s2, dissolving a coupling agent in an anhydrous organic solvent, adding a mixture of Si and SiOx, and reacting under the protection of inert gas; s3, washing with an alcohol solvent to remove unreacted reagents; s4, performing low-temperature vacuum drying under the protection of inert gas; s5, fully dispersing the powder into an organic reagent; s6, adding a tetraaldehyde monomer and a hydrazine coupling agent into the mixed solvent to react to generate COF, and adding an organic alkali and a sulfonating reagent when the reaction is carried out for 20-40 minutes; and S7, carrying out centrifugal separation on the solution, taking out the precipitate, cleaning, and carrying out vacuum drying. Compared with the prior art, the silicon-based negative electrode material with high specific capacity, high magnification and high cycling stability is prepared by compounding a silicon-oxygen negative electrode and a covalent organic framework (COF) material through a surface modification process.

The invention belongs to the field of waste battery material recovery, and provides a waste battery material recovery method based on a plasma chemical vapor deposition technology. Firstly, a network compound with a metal chelating function is synthesized and forms stable combination with active sites on the surface of an electrode in subsequent coating deposition, and harmful metal ions are effectively captured; secondly, a fluorine-containing imidazolyl-quaternary ammonium salt network compound is designed, and the fluorine-containing imidazolyl-quaternary ammonium salt network compound is endowed with excellent surface passivation and chemical stability by a fluorinated group; in the stripping process, the active material and the metal current collector are separated by periodically adjusting the temperature and combining the plasma technology, the stripped active powder can be further extracted and purified through acid pickling treatment, and the metal current collector is combined with a fluorine-containing compound and an inorganic silica network deposition process. The metal surface is endowed with good corrosion resistance and reprocessing performance, the method is suitable for recycling of electrode materials in waste batteries, and meanwhile the recycling value of related materials is improved.

The present invention relates to the field of anode materials for lithium-ion batteries, and discloses a preparation method of a silicon-based anode material with high capacity and high initial efficiency, comprising: (1) mixing silicon monoxide with glucose and gluconate to obtain precursor A; (2) dispersing precursor A in deionized water to dissolve glucose and gluconate in water to form a dispersion, and freeze-drying the dispersion to obtain a material to be sintered B; (3) placing the material to be sintered in an atmosphere of protective gas, heating and holding the temperature, and finally cooling to obtain a finished product of a silicon-oxygen anode material for a lithium-ion battery with high capacity and high initial efficiency. The silicon-oxygen anode material prepared by the present invention has the characteristics of high capacity and high initial efficiency. When at a voltage of 0.8V, the initial efficiency of the prepared silicon monoxide anode material reaches 85%, and the capacity is greater than 1300 mAh / g.

This application discloses a secondary battery and a device containing the secondary battery. A positive active material of the secondary battery includes one or more of lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and a modified material thereof. A negative active material of the secondary battery includes a silicon-oxygen compound and graphite. A separator of the secondary battery includes a substrate and a coating layer. The secondary battery satisfies:7.5≤3⁢4⁢6⁢0E⁢D-⁢(D⁢50-DC⁢50×0.75-T18)≤11.5,where ED≥270 Wh / Kg, 11 μm≤D50≤18.5 μm, 11 μm≤DC50≤20 μm. The secondary battery according to this application achieves relatively high cycle performance while achieving a relatively high energy density concurrently.

This invention discloses a porous metal-doped silicon-oxygen composite material, its preparation method, and its application. The method involves uniformly dispersing an organometallic compound, an organic dispersing solvent, and an organometallic coupling agent, then adding silicon-oxygen material, followed by spray drying, high-temperature sintering, and secondary granulation to obtain the porous metal-doped silicon-oxygen composite material. This composite material reduces expansion and improves electronic conductivity by embedding silicon-oxygen into the porous metal. Compared with porous carbon and inorganic metals, porous metals are easier to disperse and have milder reaction conditions. Therefore, the resulting porous metal-doped silicon-oxygen composite material exhibits advantages such as high initial efficiency, good power performance, and low expansion when applied to lithium-ion batteries.

The present application relates to a display module and a display device. The display module comprises a display panel and a cover plate arranged on one side of the display panel, wherein the cover plate comprises an ultra-thin glass layer and a cover layer, the ultra-thin glass layer being located on one side of the display panel, and the cover layer at least covering the side of the ultra-thin glass layer away from the display panel. The cover layer contains a silicon-oxygen coupling agent, and a chemical bond is formed between part of the silicon-oxygen coupling agent and the ultra-thin glass layer.