82 results about "Silicon oxygen" patented technology

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 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 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 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 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 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.

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 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.

The invention relates to a glass cover plate, a preparation method thereof and a display panel. The preparation method of the glass cover plate comprises the following steps: performing a first liquid phase deposition reaction on the surface of a glass substrate by using a first deposition solution containing a carboxylic acid compound to form an organic antireflection film; performing a second liquid phase deposition reaction on the surface of the organic antireflection film by using a second deposition solution containing a silicate ester compound and water to form a silicon-oxygen transition layer; forming an AF film on the surface of the silica transition layer; wherein the molar ratio of water in the second deposition liquid to silicate ester bonds in the silicate ester compound is 0.2-1.8; the pH value of the second deposition liquid is 2.5 to 6; the temperature of the second liquid phase deposition reaction is greater than or equal to 50 DEG C; the time of the second liquid phase deposition reaction is greater than or equal to 10 minutes. The glass cover plate which is high in transmittance, good in anti-fingerprint effect and excellent in wear resistance can be prepared.

The invention discloses a corona aging evaluation method and device for a silica polymer insulating material. The method comprises the following steps: acquiring electronic parameters related to corona aging of a silica polymer insulating material; calculating the effective electron number density with the key breaking capability; calculating the relative reduction amount Y of the integral area of the silicon-oxygen bond; constructing a relation model of the Y and the corresponding effective electron number density under different aging experiment conditions; and obtaining the electron number density of the silica polymer insulating material with the bond breaking capability under the to-be-tested aging experiment condition, and evaluating the corona aging of the silica polymer insulating material. According to the method, the quantitative model between the simulation data and the FTIR microscopic detection result is established, accurate prediction of the material aging degree under the unverified working condition is achieved, and the method is remarkably superior to a traditional experience extrapolation method.

The invention relates to a preparation method of an adsorption material based on a silicon product in silicon-manganese slag. The preparation method comprises the following steps: (1) preparing silicon-manganese slag powder; (2) carrying out acid leaching treatment, and carrying out centrifugal separation after acid leaching treatment to obtain a silicon-containing liquid; (3) extracting a silicon product; and (4) preparing the adsorption material. The adsorbing material is prepared on the basis of a silicon product in the silicon-manganese slag, the adsorbing material has a remarkable porous structure and is formed by arranging silica tetrahedron (SiO4) and calcium ion layers, exchangeable Ca < 2 + > is rich in layers, a structural channel is provided for migration and immobilization of heavy metal ions, and the adsorbing material has multiple effects of ion exchange, surface complexing, chemical precipitation, electrostatic attraction and the like. Under the acidic condition, the adsorbent has extremely high adsorption capacity on Ca < 2 + > and Mn < 2 + >, and the adsorption capacity is far higher than that of many commercial adsorbents.

This invention relates to a method for preparing silicon-coated copper, an anti-oxidation copper coated with silicon prepared by the method, and a semiconductor device using the same. More specifically, it relates to copper on a silicon (Si) coated surface, wherein silicon (Si) is vapor-deposited to form a silicon (Si)-oxygen (O)-copper (Cu) mixed layer protective film to maintain electrical properties and have anti-oxidation properties. The anti-oxidation copper coated with silicon according to the present invention is characterized by the vapor-deposit of silicon (Si) to form a silicon (Si)-oxygen (O) mixed layer. The present invention is characterized in that the aforementioned silicon-coated copper comprises: a copper layer (10); SiCuO x Layer (20) is formed by mixing silicon (Si)-oxygen (O)-copper (Cu) on the upper end of the copper layer (10); the first silicon (Si)-oxygen (O) mixed layer (30) is formed on the SiCuO layer. x The upper end of layer (20); a silicon layer (40) is formed on the upper end of the first silicon (Si)-oxygen (O) mixed layer (30); and a second silicon (Si)-oxygen (O) mixed layer (50) is formed on the upper end of the silicon (Si) layer (40). The method for preparing silicon-coated copper according to the present invention is characterized by depositing silicon (Si) by a single sputtering process.

The application provides a winding core and a battery, and relates to the technical field of batteries. The winding core is formed by winding a positive plate, a diaphragm and a negative plate. The positive plate comprises a first surface and a second surface. The positive plate is provided with a plurality of convex portions and flat portions between adjacent convex portions. The convex portions are formed by protruding part of the positive plate from the second surface to the first surface. The maximum distance from the vertex of the convex portion to the plane of the first surface is h1. The thickness of the flat portion on the positive plate is h. 5%<=h1 / h<=30%. The negative plate comprises a negative current collector and a negative active layer on the negative current collector. The negative active layer comprises a silicon-carbon composite material and / or a silicon-oxygen composite material. The percentage content of silicon in the negative active layer is W1. 0.3<=W1 / (h1 / h)<=5. The winding core can increase the liquid storage space between layers, improve the liquid retention amount between layers, and delay the attenuation of the battery capacity.

The invention discloses a carbon aerogel coated silica negative electrode material based on interface chemical bonding and three-dimensional buffering and a preparation method thereof, the material comprises a monatomic silicon core, a SiOx transition buffer layer and a carbon aerogel three-dimensional porous network layer from inside to outside, and an integrated interpenetrating network is formed through Si-O-C covalent bonds. The SiOx layer and carbon aerogel gradient pores cooperate to buffer volume expansion, nitrogen-cobalt co-doping and Li3PO4 modification improve charge transfer efficiency, and dynamic disulfide bonds endow a self-repairing function. The preparation method adopts silicon core oxidation modification, silane coupling agent grafting, dynamic carbon source co-assembly and freeze-drying carbonization processes. The problems of volume expansion, short cycle life and low first efficiency of a traditional silicon-based material are solved, and the method is suitable for the field of high-energy-density lithium ion batteries.

The application relates to the technical field of metal electrodes, and discloses an aluminum electrode and a preparation process and application thereof. The preparation process of the aluminum electrode comprises the following steps: printing aluminum paste, wherein the aluminum paste comprises aluminum powder, a metal compound, an organic phase, an inorganic glass phase and conductive carbon nanomaterial, the inorganic glass phase comprises rare earth oxides; sintering the aluminum paste: placing the aluminum paste in a pre-sintering section at 150-350 DEG C, so that the organic phase is volatilized and decomposed; placing the aluminum paste in a middle sintering section at 350-600 DEG C, so that the inorganic glass phase is softened into a glass body, and a silicon-oxygen protective thin layer is formed on the doped polysilicon after etching and anti-reflection passivation; placing the aluminum paste in a post-sintering section at 600-700 DEG C, so that a metal-based composite carbon nanomaterial layer is formed on the silicon-oxygen protective thin layer, the aluminum powder is gradually dissolved, and the aluminum layer is formed on the metal-based composite carbon nanomaterial layer after cooling. The aluminum paste is not in contact with the doped polysilicon in the sintering process, and the obtained aluminum electrode can greatly reduce the interface metal composite and contact resistance.

To provide semiconductor devices with good electrical characteristics. To provide highly reliable semiconductor devices. To provide semiconductor devices with stable electrical characteristics. [Solution] The semiconductor device comprises a first insulating layer, a second insulating layer, a semiconductor layer, and a first conductive layer. It has a semiconductor layer, a second insulating layer, and a first conductive layer on a first insulating layer, in this order. The layers are stacked. The first insulating layer consists of the first insulating film, the second insulating film, and the third insulating film. It has a layered structure in which layers are stacked in order. The second insulating layer contains an oxide. The third insulating layer is semi- It has a portion that is in contact with the conductive layer. The first insulating film contains silicon and nitrogen. The second insulating film The edge film contains silicon, nitrogen, and oxygen. The third insulating film contains silicon, oxygen, The semiconductor layer contains indium and oxygen.

The application belongs to the technical field of fuel cell materials, and particularly relates to a preparation method of a siloxane network anion exchange membrane, which comprises the following steps: (1) preparation of a polyaryl piperidine polymer; (2) preparation of iodomethyl trimethoxysilane; (3) modification of siloxane; (4) preparation of an anion exchange membrane; and (5) hydrolysis of siloxane. In the application, the siloxane can be hydrolyzed into a siloxane network structure containing hydroxyl groups, so as to improve the water retention capacity of the membrane and improve the chemical stability of the membrane under water shortage conditions such as low humidity or high current density. Meanwhile, by changing the hydrolysis conditions of the siloxane and controlling the structure of the hydroxyl-containing siloxane network, the hydrated ion channel can be controlled, the ion transmission rate of the membrane can be optimized, the membrane has a high ion conductivity, and the application has a wide application prospect in the field of anion exchange membrane fuel cells.

The application discloses a kind of silicon-oxygen negative electrode prelithiation methods and application based on lithium metallocene solution, belong to lithium ion battery technical field.Inert atmosphere, lithium metallocene is dissolved in organic solvent, and is configured into prelithiation solution;Silicon-oxygen negative electrode piece is immersed in prelithiation solution, and prelithiation is realized by chemical displacement reaction;Subsequently, the piece is taken out and washed and dried.The application utilizes moderate reduction potential of lithium metallocene, can carry out uniform, controllable bulk prelithiation to silicon-oxygen negative electrode, effectively compensates irreversible lithium loss in the first charge-discharge process, and the first coulomb efficiency is increased from 75~85% to more than 90%.The method is simple, safe and reliable, low in cost, and has high compatibility with existing battery manufacturing process, is suitable for large-scale production, and has great value for promoting commercial application of high energy density silicon-oxygen negative electrode.

The invention discloses a refining slag system, a preparation method and a high-vacuum refining method, and relates to the technical field of vacuum refining, and the refining slag system comprises the following components in percentage by mass: 60%-75% of SiO2, 8%-15% of Al2O3, 8%-15% of TiO2, 3%-8% of CaO, 1%-3% of Fe2O3, 2%-5% of Na2O and 1%-3% of K2O. According to the method, by means of the acidic high-viscosity slag formed with the high SiO2 content, on one hand, high-density HfO2 inclusions can be physically captured, and the HfO2 inclusions are prevented from returning to the alloy melt; and on the other hand, the slag can form a compact covering layer on the alloy liquid level, and volatilization loss of high-volatility elements such as aluminum under high vacuum (smaller than or equal to 0.1 Pa) is effectively inhibited. Meanwhile, TiO2 and Al2O3 in a slag system can be stably fixed in a silicon-oxygen network through structural solid solution.

The application provides a coated pre-lithiated silicon-oxygen negative electrode material and a preparation method and application thereof, and relates to the technical field of silicon negative electrode material preparation. The coated pre-lithiated silicon-oxygen negative electrode material comprises a pre-lithiated silicon-oxygen material, an interface stabilizing layer coated on the outer surface of the pre-lithiated silicon-oxygen material, and a hydrophobic layer coated on the outer surface of the interface stabilizing layer. The coated pre-lithiated silicon-oxygen negative electrode material can isolate the silicon from water and electrolyte, avoid the reaction of the silicon and hydroxyl ions to produce gas in the pulping process, and improve the cycle performance of the battery cell.