155 results about "Silicon oxygen" patented technology

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 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 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 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.

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 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 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.

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.

A silicon-carbon composite material includes a core portion and a shell layer disposed on a surface of the core portion, where the core portion includes a silicon-based material and / or graphite, the shell layer includes a silicon-carbon composite, and the silicon-carbon composite includes a silicon-oxygen compound SiOx, where 0<x<2. The silicon-carbon composite material allows the electrochemical device to have both high energy density and long cycle life.

This application relates to the technical field of lithium-ion battery materials, specifically disclosing a high-efficiency silicon-oxygen composite anode material, its preparation method, and its application. The preparation method of this anode material includes the following steps: mixing a siloxane with a fatty acid at a mass ratio of 1:(5~35), and ball milling under inert gas protection to obtain a pre-coated mixture; heating the pre-coated mixture to 50~1500℃ under an inert atmosphere and holding for 1~20h to obtain a carbon-coated silicon-oxygen material; immersing the carbon-coated silicon-oxygen material in a lithium-rich organic composite solution, holding at -5~25℃ under inert gas protection for 5~180 minutes, and drying to obtain a pre-lithiation product; mixing the pre-lithiation product with a nitride at a mass ratio of 1:(0.1~5), and ball milling under inert gas protection to obtain the high-efficiency silicon-oxygen composite anode material. This application can synergistically improve the stability and initial efficiency of the silicon-oxygen composite anode material.

The application relates to the technical field of lithium ion battery materials, and discloses a high-power low-expansion silicon-oxygen metal oxide composite material and a preparation method thereof, wherein porous metal is used as an inner core, nano silicon and carbon nanotubes are deposited on the surface of the porous metal through an electrochemical deposition method, drying is carried out, and finally, a fast ion composite conductor is deposited on the surface of the porous metal through an atomic vapor deposition method, so that a silicon-oxygen composite material is obtained. The silicon-oxygen composite material utilizes the fast ion conductor of the shell to improve the ion transmission rate in the charging and discharging process, utilizes the porous metal of the inner core to reduce expansion and improve electronic conductivity, simultaneously utilizes the network structure of the carbon nanotubes to bind the expansion of silicon, improve liquid retention, and improve cycle performance. The silicon-oxygen composite material prepared by the application has the characteristics of low expansion, good power performance, excellent cycle performance and the like when applied to a lithium ion battery.

The present application relates to a kind of composite silicon carbon negative electrode material and its preparation method and application, composite silicon carbon negative electrode material includes: lithium-containing silicon carbon composite material, composite coating layer being coated in the outer surface of lithium-containing silicon carbon composite material, and carbon coating layer being coated in the outer surface of composite coating layer;Lithium-containing silicon carbon composite material includes: porous carbon, and nano silicon particles and lithium silicon alloy attached in the pore of porous carbon;Lithium silicon alloy's chemical general formula is Li x Si, wherein, 0 < x ≤ 4.4;Composite coating layer includes: silicon oxide compound and lithium-containing oxygen compound;Silicon oxide compound's chemical general formula is SiO z , wherein, 0 < z ≤ 2;Lithium-containing oxygen compound includes: one or more of lithium silicate, lithium oxide, lithium hydroxide, lithium carbonate;The composite silicon carbon negative electrode material provided by the embodiment of the present application is used in lithium ion battery, can improve the first coulomb efficiency of battery, inhibit the volume expansion of pole piece, improve the cycle life of battery.

A device includes a substrate and a transistor on the substrate. The transistor includes a channel region that has at least one semiconductor nanostructure, and a gate electrode. A source / drain region is disposed adjacent to a first side of the channel region along a first direction. A hybrid fin structure is disposed adjacent to a second side of the channel region along a second direction that is transverse to the first direction. The hybrid fin structure includes a first hybrid fin dielectric layer and a second hybrid fin dielectric layer. The first and second hybrid fin dielectric layers include silicon, oxygen, carbon and nitrogen and have a different concentration of at least one of silicon oxygen, carbon, or nitrogen from one another.

This invention discloses a high-capacity nitrogen-doped porous silicon-oxygen-carbon anode material, its preparation method, and its application. The anode material comprises nitrogen-doped carbon material and biomass porous silicon-oxygen material, with the nitrogen-doped carbon material coating the biomass porous silicon-oxygen material. The nitrogen content in the anode material is ≥13 at%. This invention utilizes the crosslinking of amino acid materials with the Si-OH groups on the surface of the biomass porous silicon-oxygen material. Carbonization promotes the polymerization-cyclization-condensation of the amino acid materials to form a high-content nitrogen-doped carbon material that uniformly coats the biomass porous silicon-oxygen material. By optimizing the surface structure of the biomass porous silicon-oxygen material, the polymerization of amino acid materials or pyrolysis products with the biomass porous silicon-oxygen material is promoted, preparing a nitrogen-doped silicon-oxygen-carbon material rich in pores. By optimizing the lithiophilicity of the biomass porous silicon-oxygen material, the prepared nitrogen-doped biomass porous silicon-oxygen-carbon material exhibits excellent electrochemical performance and cycle stability.

The present invention belongs to battery materials, specifically to Na a Fe b X c Y d (BO3) e A positive electrode active material, wherein X is at least one of F, Cl, and Br; Y is at least one of a phosphorus oxide anion and a silicon oxide anion; a is in the range of 1 to 4, b is in the range of 1 to 4, c is in the range of 0.3 to 2, d is in the range of 0.3 to 2; and e is in the range of 0.01 to 0.1. The present invention also includes methods for preparing and using the material. The material of the present invention has excellent performance, can adapt to the requirements of high electrode thickness loading, and can exhibit excellent electrochemical performance at high loading thicknesses.

A negative electrode film layer, a negative electrode sheet, a secondary battery and an electric device. The negative electrode film layer comprises a first active material layer and a second active material layer which are arranged in a stacked manner, wherein the material of the first active material layer comprises a first silicon-oxygen material, and the material of the second active material layer comprises a second silicon-oxygen material; and the chemical formula of the first silicon-oxygen material is SixOy, and the chemical formula of the second silicon-oxygen material is SimOn, where x<y, and m＞n.

The invention relates to a modified negative electrode material and a preparation method thereof, a negative electrode plate, a secondary battery and an electric device. The modified negative electrode material comprises an inner core and a coating layer coating at least part of the surface of the inner core, the inner core comprises a carbon-based material, the coating layer comprises a silicate material, the framework structure of the silicate material is composed of a three-dimensional network formed by mutually connecting angular top co-oxygen of a silica tetrahedron and a metal oxygen octahedron, and at 25 DEG C, the ionic conductivity of the silicate material is 1 * 10 <-5 > S.cm <-1 >-9 * 10 <-4 > S.cm <-1 >. The coating layer of the modified negative electrode material not only has stable chemical properties, but also can protect the surface of the core material in the circulation process and relieve volume expansion and particle breakage of the core material; meanwhile, the transmission rate of lithium ions on the surface of the core material is increased, battery polarization caused by ion migration is reduced under the condition of high-rate charging and discharging, and the fast charging performance of the battery can be greatly improved.

The application relates to a display module and a display device; the display module comprises a display panel and a cover plate; the cover plate is arranged on one side of the display panel; the cover plate comprises an ultrathin glass layer and a cover layer; the ultrathin glass layer is located on one side of the display panel; the cover layer covers at least one side of the ultrathin glass layer away from the display panel; wherein the cover layer contains a silicon-oxygen coupling agent; part of the silicon-oxygen coupling agent and the ultrathin glass layer form a chemical bond; the application can effectively improve the hardness of the cover plate, improve the touch feeling and the crease phenomenon, improve the adhesion between the ultrathin glass layer and the cover layer, and reduce the probability of peeling between the ultrathin glass layer and the cover layer.

The invention relates to a negative pole piece and a preparation method thereof and a silicon-carbon soft package lithium battery, the negative pole piece comprises a current collector and a negative active material layer located on at least one side surface of the current collector, the negative pole piece comprises an inner layer, a protective layer and a stable layer which are stacked in sequence, and the inner layer is close to the current collector; the inner layer comprises a first silicon-carbon composite material; the protective layer comprises a second silicon-carbon composite material and a first silicon-oxygen composite material; and the stable layer comprises a second silica composite material and a graphite material. The negative electrode active material layer comprises the inner layer, the protective layer and the stable layer which are stacked, the inner layer provides high specific capacity, excellent fast charging capacity and excellent conductivity, the protective layer ensures the stability of interface contact and effectively relieves negative effects caused by silicon expansion, the stable layer can improve the stability of the battery under high voltage, and the stability of the battery under high voltage is improved. Lithium separation of the battery under high magnification is avoided, long-term stability of the battery performance is ensured, and the problem of performance degradation of the silicon-carbon soft package lithium battery under fast charging and voltage window operation conditions is effectively improved.

The invention relates to silicon oxide particles and a preparation method thereof.The preparation method comprises the following steps that a silicon oxide precursor is mixed with water-soluble alkali metal salt, water-soluble aluminum salt and boric acid, the pH is adjusted to be acidic, and composite precursor slurry is obtained; carrying out spray granulation on the composite precursor slurry to obtain precursor particles; and roasting the precursor particles at high temperature to obtain silicon oxide particles. In the high-temperature roasting process, the doped alkali metal and boron element can serve as efficient fluxing agents, a low-melting-point liquid phase is formed at the low temperature, substance migration and pore filling are promoted, and rapid densification of particles is achieved; meanwhile, the aluminum element is used as a silicon-oxygen network structure regulator, network weakening caused by liquid phase formation can be effectively compensated, and the stability of the particle structure is enhanced, so that the silicon oxide particles with high compactness and high mechanical strength can be prepared, and the process energy consumption and equipment requirements can be reduced.