343results about "Silicon oxides" patented technology

The present invention relates to a silicon-carbon composite, a preparation method therefor, and an anode active material comprising same. The silicon-carbon composite includes silicon particles, silicon oxides, magnesium compounds, and carbon. As a molar ratio (O / Si) of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite satisfies 0.01 to 0.60, when the silicon-carbon composite is applied to an anode active material, the discharge capacity, initial efficiency, and capacity retention ratio after cycles of a lithium secondary battery may be simultaneously improved.

The invention provides a preparation method of a silicon monoxide negative electrode material and an external-pressure-free silicon-based solid-state battery, low-volume-expansion silicon monoxide is used as a negative electrode, a polymer solid-state electrolyte with high ionic conductivity is used as an electrolyte, and a positive electrode is combined to finally assemble a soft package battery or a cylindrical battery. And the silicon monoxide negative electrode has a relatively low volume expansion effect and excellent electrode structure stability, so that the cycle life and the stability of the battery are favorably improved. The polymer solid electrolyte shows excellent stress buffering capability in a solid electrolyte system due to low Young modulus and excellent flexibility, and can effectively adapt to volume change of a silicon-based negative electrode in an electrochemical cycle process. The technology can help the silicon-based solid-state battery get rid of dependence on external pressure, and the technology is relatively simple, high in applicability and wide in application value.

This application provides a silicon-based negative electrode active material. The silicon-based negative electrode active material includes a silicate containing an alkali metal element. The silicon-based negative electrode active material contains element Mg and element Mn.

The invention provides a silicon-based material and a preparation method thereof, a negative pole piece and a solid-state battery. The silicon-based material comprises an inner core and a surface coating layer, the inner core comprises a silicon-based negative electrode material, the surface coating layer is a carbon fluoride layer, the carbon fluoride layer internally comprises Li-M, LiF and LiX, M represents a metal element and is selected from at least one of Ag, Mg, Zn and Al, and X represents a non-metal element and is selected from at least one of N, S and P. The silicon-based negative electrode material is used as a core, the surface of the silicon-based negative electrode material is coated with the carbon fluoride layer, and the Li-M alloy / LiF / LiX composite lithium compound is introduced into the carbon fluoride layer, so that triple effects of ion-electron double-conduction network construction, interface chemical stabilization and mechanical buffer enhancement are achieved; and the chemical stability of an interface between the silicon negative electrode and sulfide solid electrolyte is improved while the rate capability of the negative electrode is improved and the expansion and shrinkage of the silicon negative electrode are relieved, and the cycling stability is improved.

The invention belongs to the technical field of solid waste recycling and porous carbon material synthesis, and particularly relates to abandoned wind turbine blade-based porous carbon as well as a preparation method and application thereof. The method comprises the following steps: carbonizing waste wind turbine blade powder in first protective gas, etching, mixing the obtained primary porous carbon material with an activator, and carrying out pyrolysis activation in second protective gas to obtain the waste wind turbine blade-based porous carbon. According to the method, the waste wind turbine blade is converted into the graded porous carbon material with micropores, mesopores and macropores, the diffusion performance of gas in the pore channels is greatly improved through the synergistic effect of the graded porous structure, the performance advantages of high capacity, fast mass transfer and high adaptability are shown, a way is provided for high-value recycling of the waste blade, and the method is suitable for industrial production. And a low-cost material is provided for the fields of energy storage and conversion, environmental governance, catalysis, adsorption and separation and the like, and the material has remarkable economic and environmental benefits and a wide commercial prospect.

The invention provides a silicon-based material and a preparation method thereof, a lithium ion battery monomer, a battery device and a power utilization device, the silicon-based material comprises a porous carbon matrix and silicon nanoparticles located in pores of the porous carbon matrix, the surface of each silicon nanoparticle is provided with a silicon oxide passivation layer formed through a passivation reaction, the ratio of the ID / IG of the silicon-based material to the ID / IG of the porous carbon matrix before the passivation reaction is (0.95-1.05): 1; the mass multiple of the Si element and the C element in the silicon-based material is recorded as A, the mass multiple of the Si element and the C element before the passivation reaction is recorded as B, and the ratio of A to B is (0.95-1.05): 1. According to the invention, the thermal safety performance, the cycle performance and the rate capability of the lithium ion battery monomer can be improved.

An anode material, including a matrix material, and the matrix material comprises carbon-doped silicon monoxide, and a content of the carbon ranges from 0.5% to 10% based on a total mass of the carbon and silicon monoxide. The anode material can significantly improve the cycle performance of an electrochemical device at room temperature and high temperature.

The present invention discloses a preparation method of a carbon-rich coal gasification slag-based iodine-doped C / SiO x composite lithium battery anode material, belonging to the field of lithium battery anode materials; First, the present invention uses a nitric acid solution to pretreat the carbon-rich coal gasification slag to remove metal impurities and obtain a solid residue; Then, the pore channels of the solid residue are modified and reformed by chemical activation to prepare a porous C / SiO x composite material; Finally, iodine (I2) is deposited on the surface and inner pore walls of the porous C / SiO x composite material by fumigation to finally obtain the anode material.

The invention provides a negative electrode active material and a preparation method and application thereof, the negative electrode active material comprises a modified carbon-coated silicon negative electrode material and a modified carbon nanotube, and the modified carbon-coated silicon negative electrode material comprises a carbon-coated silicon negative electrode material and heteroatoms; the carbon-coated silicon negative electrode material comprises a silicon material and a carbon layer coated on the outer surface of the silicon material, heteroatoms are arranged inside or / and on the surface of the carbon layer, and the heteroatoms comprise at least one of O, N and F elements; the modified carbon nanotube is wound on the surface of the modified carbon-coated silicon negative electrode material, the modified carbon nanotube comprises a carbon nanotube and a first oxygen-containing functional group, the first oxygen-containing functional group is arranged on the end surface or / and the defect position of the carbon nanotube, and the first oxygen-containing functional group is connected with the carbon layer through a hydrogen bond. According to the negative electrode active material, the heteroatoms and the first oxygen-containing functional group are introduced, so that the conductivity of the negative electrode active material can be improved, and the expansion of the silicon material in the charging and discharging process is inhibited.

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 invention relates to the technical field of lithium battery material production, in particular to a lithium ion battery silicon-oxygen negative electrode material preparation system and method.The lithium ion battery silicon-oxygen negative electrode material preparation system comprises a transversely-arranged furnace body, the furnace body is internally provided with a preheating area and a high-temperature area, and the lithium ion battery silicon-oxygen negative electrode material preparation system further comprises a two-way conveying part, a driving assembly and a gas guide assembly; the driving assembly is arranged on the furnace body and connected with the two-way conveying piece. Through the arrangement of the two-way conveying part, the driving assembly and the air guide assembly, carrier particles can be preheated before entering a high-temperature area, and the situation that tiny cracks are generated due to the fact that thermal stress on the surfaces of the carrier particles is too large due to sudden temperature difference when the carrier particles enter the high-temperature area is avoided; and meanwhile, the carrier particles can be continuously subjected to'climbing-sliding-re-climbing 'movement in the rotating process of the two-way conveying part, so that full contact between the carrier particles and the reaction gas is ensured, and dual guarantee on the endurance performance of the lithium battery is realized.

An electrode for a lithium metal battery according to an embodiment of the present invention comprises a lithium metal storage layer containing silicon oxide particles. The silicon oxide particles have a porous structure, and the molar ratio of oxygen to silicon contained in the silicon oxide particles is 1.5 or more and less than 2.0. A lithium metal battery according to an embodiment of the present invention includes an electrode for a lithium metal battery according to the above embodiment.

The present application relates to the technical field of copper clad laminates, and discloses a copper clad laminate, a resin composition for the copper clad laminate, and spherical silicon and a preparation method therefor. The spherical silicon of the present application is composed of spherical silicon dioxide and zinc molybdate particles dispersedly grown on the surface of the spherical silicon dioxide in situ and has a diameter of less than 10 microns and a D50 of 0.6-6 microns. The content of zinc molybdate per unit area on the surface of the spherical silicon dioxide is 0.03-1 g / m2, and the size of the zinc molybdate particles is less than or equal to 400 nm. The preparation method comprises: enabling spherical silicon dioxide to come into contact with / be mixed with a soluble molybdate and a zinc salt in an aqueous reaction system; and reacting the soluble molybdate with the zinc salt in situ on the surface of the spherical silicon dioxide, so as to form spherical silicon chemically coated with zinc molybdate particles. In the present application, by directly synthesizing the zinc molybdate in situ on the surface of the spherical silicon dioxide by means of a hydrothermal method, the structural morphology of the obtained spherical silicon and the size of the zinc molybdate particles can be effectively controlled, thereby ensuring that the wear of a drill bit during the drilling of the copper clad laminate is effectively mitigated.

A rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes a rhombohedral zinc orthosilicate (Zn2SiO4) phase, a cubic zinc ferrite (ZnFe2O4) phase, and a hexagonal silicon dioxide (SiO2) phase. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material exhibits a morphology including spherical microscale particles with an average diameter ranging from 0.8 micrometer (μm) to 1.8 μm and irregular nanoscale aggregates with an average diameter ranging from 50 nanometer (nm) to 110 nm. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material has an adsorption capacity for basic fuchsin dye of greater than or equal to 140 milligrams per gram (mg / g). Furthermore, a method for producing the rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes calcination of metal precursors.

A device and method for detecting the presence of, or measuring the concentration or amount of, at least one analyte in a sample fluid, including (1) at least one electrode, (2) a plurality of affinity-based probes, at least one of the affinity-based probes being capable of binding to an analyte, (3) a plurality of redox molecules, wherein one or more affinity-based probes of the plurality of affinity-based probes each have at least one redox molecule associated therewith; and (4) a non-monolayer blocking layer associated with a surface of the at least one electrode.

The invention relates to preparation and application of a C-N doped lithium ion battery silicon-based negative electrode material, and belongs to the technical field of lithium ion battery preparation. The C-N doped lithium ion battery SiOx negative electrode material is granular in structure and rich in holes, volume expansion of a silicon-based negative electrode is relieved, the capacity retention ratio is high after 500 cycles, and the battery rate performance is excellent. According to the invention, a large amount of N element is introduced into the coating layer, so that a C / N co-doping effect is achieved, and the cycle stability of the negative electrode material is improved. In the invention, the production process is simple, the process conditions are easy to control, the cost is lower, and industrial mass production is facilitated.

The present invention relates to a method for preparing a negative electrode active material for a lithium secondary battery and a negative electrode active material prepared thereby, the method comprising: a first step of dispersing silicon-based particles in a solvent to form a silicon dispersion; a second step of adding a ferric salt and a tannic acid to the silicon dispersion and stirring to form a reaction layer of the ferric salt and the tannic acid on the surface of the silicon-based particles; a third step of performing heat treatment on the reaction layer of the ferric salt and the tannic acid to form an amorphous carbon coating; and 4, carrying out acid treatment on the amorphous carbon coating to form the porous amorphous carbon coating.

A negative active material for a rechargeable lithium battery, the negative active material including a porous amorphous carbon matrix having a porosity of about 10 % to about 64 %, silicon oxide distributed in pores of the porous amorphous carbon matrix, and a coating layer on a surface of the porous amorphous carbon matrix, the coating layer including an amorphous carbon.

The present invention relates to a method for preparing silicon monoxide nanopowder, and belongs to the technical field of non-metallic powder material preparation. The present invention uses SiO2 aerogel powder with a three-dimensional continuous structure surface as raw material, adsorbs hydrogen molecules on the surface of the powdered SiO2 aerogel, and axially feeds an argon-excited inductively coupled plasma torch. The hydrogen molecules are excited by the argon plasma torch to form a highly active hydrogen-rich plasma, which undergoes a reduction reaction with the SiO2 aerogel powder having the characteristics of high specific surface area and high porosity. The generated silicon monoxide vapor is quenched by argon downstream of the reaction device to obtain highly dispersible silicon monoxide nanopowder. This method overcomes the defects of the traditional solid-solid reaction method for preparing silicon monoxide, which has a slow reaction rate and low raw material conversion rate, and at the same time solves the safety problems existing in the traditional method of producing silicon monoxide by hydrogen reduction, thereby greatly improving production efficiency and safety.

The present invention discloses a silicon monoxide nanomaterial and a preparation method thereof, belonging to the technical field of nanomaterials. The silicon monoxide nanomaterial comprises the following raw materials in parts by weight: metal silicon powder: 80 - 120 parts, silicon dioxide powder: 20 - 40 parts, binder: 0.5 - 3 parts, surfactant: 2 - 8 parts; in the present invention, intermediate 1 is prepared by the substitution reaction of 3 - allyl - 2 - hydroxybenzaldehyde and epichlorohydrin, then intermediate 2 is prepared by the ring - opening reaction of intermediate 1 and n - decanol, then intermediate 3 is prepared by the sulfonation reaction of intermediate 2 and 1,3 - propane sultone, and finally the surfactant is prepared by the polymerization reaction of 2 - methacryloyloxyethyl phosphorylcholine, 2 - acrylamide - 2 - methylpropanesulfonic acid and intermediate 3. The silicon monoxide nanomaterial prepared by the present invention has a high initial Coulomb efficiency and good cycle performance.

The present invention relates to a method of preparing a negative electrode active material for a lithium secondary battery, which includes a first step of forming a silicon dispersion by dispersing silicon-based particles in a solvent; a second step of adding an iron salt and tannic acid to the silicon dispersion and stirring to form a reaction layer of the iron salt and the tannic acid on surfaces of the silicon-based particles; a third step of heat treating the reaction layer of the iron salt and the tannic acid to form an amorphous carbon coating layer; and a fourth step of acid treating the amorphous carbon coating layer to form a porous amorphous carbon coating layer, and a negative electrode active material prepared thereby.

The present invention relates to a silicon-based molded body capable of improving the production efficiency of silicon oxide by inducing a solid-liquid reaction with liquefied silicon. The silicon-based molded body according to the present invention comprises: a first powder containing silicon; a second powder containing silicon oxide; and a third powder containing at least one metal selected from the group consisting of alkali metals, alkali earth metals, transition metals, and post-transition metals, at least two species of powders among the first to third powders being different in average diameter (D50) from each other, and the silicon-based molded body is formed by compressively molding a mixture of the first to third powders.

To provide: a negative electrode capable of significantly increasing capacity while maintaining battery characteristics; and a method for manufacturing such negative electrode.SOLUTION: A negative electrode includes: a negative electrode current collector having a roughened surface; and a negative electrode active material provided on the negative electrode current collector. The negative electrode active material comprises negative electrode active material particles including a compound of lithium, silicon, and oxygen. The negative electrode active material particles can be represented by SiOxLiy, and a value of x is 0.8 or more and 1.2 or less, and a value of y is 0.5 or more and 3.4 or less. The negative electrode active material has a multilayer structure composed of two or more layers. In Si2p bond energy obtained by X-ray photoelectron spectroscopy analysis of a layer interior in each layer of the negative electrode active material having the multilayer structure, intensity of a peak A acquired in the vicinity of 98 eV and intensity of a peak B acquired in the vicinity of 100.5 eV have a relation (intensity of peak A)≥(intensity of peak B).SELECTED DRAWING: Figure 1

The present invention relates to a negative electrode active material, a negative electrode including the same, a secondary battery including the same and a method for preparing the negative electrode active material.

The present invention relates to the field of negative electrode materials and provides a negative electrode material, a manufacturing method thereof, and a battery. The negative electrode material includes a silicon-based active material and a lithium silicate, and further includes Mg, Al, and P, wherein the mass content of Mg in the negative electrode material is a%, the mass content of Al in the negative electrode material is b%, and the mass content of P in the negative electrode material is c%, and a, b, and c in the negative electrode material satisfy the relationship 0.3≦(a+b) / c≦1.5 and 0.5≦a+b+c≦10. The introduction of Mg, Al, and P into the negative electrode material provided by the present invention is beneficial to the formation of lithium ion transmission channels and can improve the rate performance of the negative electrode material.

This invention provides a nano-silicon@SiO x This invention relates to the field of silicon cutting waste recycling technology, specifically the MXene composite anode material and its preparation method. The invention involves oxidizing silicon cutting waste to obtain nano-silicon@SiO₂. x Then, nano-silicon@SiO x When mixed with a pH buffer solution, negatively charged nano-silicon@SiO₂ is obtained. x The precursor was MAX etched to obtain MXene. MXene was mixed with a cationic surfactant solution to obtain positively charged MXene. Finally, negatively charged nano-silicon@SiO2 was added. x Positively charged MXene and pH buffer solution were mixed to obtain nano-silicon@SiO. x / MXene composite anode material. Nano-silicon@SiO2 prepared in this invention. x The MXene composite anode material overcomes the problems of volume expansion and poor conductivity of silicon materials during the charging and discharging process of lithium-ion batteries, and significantly improves the electrochemical performance of silicon-based anode materials.

The invention discloses a multilayer silicon-carbon negative electrode material and a multistage fluidized bed continuous preparation method thereof. The multilayer silicon-carbon negative electrode material is formed by wrapping silicon layers, SiOx layers and carbon layers at intervals, the silicon layers are isolated by the carbon layers or the SiOx layers, the carbon layers are isolated by the silicon layers or the SiOx layers, and the SiOx layers are isolated by the silicon layers. According to the multi-stage fluidized bed continuous preparation method, different parameters are set in each stage of fluidized bed reactor to adapt to the physical property change of solid particles, so that the continuous process is realized. The multilayer silicon-carbon negative electrode material provided by the invention has a uniform hierarchical structure and the SiOx intermediate layer prepared by limited oxidation, so that the charging capacity and the cycling stability of the silicon-carbon negative electrode material can be effectively improved, and the application value is improved.

Provided are a negative electrode active material which includes negative electrode active material particles which includes a silicon oxide (SiOx, 0<x≤2); and at least one lithium silicate selected from Li2SiO3, Li2Si2O5, and Li4SiO4 in at least a part of the silicon oxide. A signal generated in a region of 200 to 600 cm−1 according to a Raman spectrum is subjected to deconvolution into three peaks, which are set to peak A, peak B, and peak C from lowest to highest of an absolute value of a wavenumber. Also disclosed are a method of preparing the same, and a negative electrode and a lithium secondary battery including the negative electrode active material.

There is provided herein a liquid solution for the recovery of oil from carbonate reservoirs comprising a solid chemical composition comprising Polyhalite in a % weight range of 70 to 99.5; NaCl in a % weight range of 5 to 30; SiO2 in a % weight range of 0.1 to 5; and injected water selected from the group including sea water, diluted sea water, desalinated seawater, produced water, aquifer water, river water, surface water, fresh water, distilled water or a combination of thereof;wherein said solid chemical composition is dissolved in said injected water in an amount of 1-10 grams of said solid chemical composition per 1 liter of said injected water.

The present application relates to a negative electrode active material, a method for manufacturing a negative electrode active material, a negative electrode composition, a negative electrode for a lithium secondary battery including the same, and a lithium secondary battery including a negative electrode.