467results about "Silicon oxides" patented technology

The present invention provides a negative electrode active material which has negative electrode active material particles, the negative electrode active material being characterized in that: the negative electrode active material particles each include a porous carbon structure; amorphous low valence nano silicon oxide is dispersed inside the porous carbon structure; the low valence nano silicon oxide includes the states where SiOx:x < 1.0 is satisfied; and the low valence nano silicon oxide has an average particle diameter of 50 nm or less as determined by image processing of a cross-sectional TEM image thereof. As a result, a negative electrode active material which is capable of increasing the capacity while maintaining the battery characteristics is provided.

The present invention is a negative electrode active material comprising negative electrode active material particles. The negative electrode active material is characterized in that: the negative electrode active material particles include porous carbon structures; silicon and a silicon oxide are dispersed in the interiors of the porous carbon structures; a low-valent nanosilicon oxide in an amorphous state is dispersed in at least surface-layer portions of the interiors of the porous carbon structures; the low-valent nanosilicon oxide is SiOx, where x is less than 1.0; and nanosilicon with a crystalline structure is dispersed at least in deep layer portions of the interiors of the porous carbon structures, such portions being deeper than where the low-valent nanosilicon oxide is dispersed. Due to this configuration, it is possible to provide a negative electrode active material that can increase capacity while maintaining battery characteristics.

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.

Provided herein are methods, systems, and kits for generating a self-assembled monolayer of beads adjacent to (e.g., on or across) a substrate. The methods, systems, and kits provided herein may comprise contacting a substrate with a plurality of beads, which may comprise nucleic acid molecules coupled thereto, and providing conditions sufficient for the plurality of beads to self-assemble adjacent to the substrate. Sequencing of the nucleic acid molecules may be performed.

An anode for a secondary battery is provided, the anode for a secondary battery including: an anode current collector; a first anode mixture layer formed on at least one surface of the anode current collector, and including a first silicon-based active material and a first conductive material; and a second anode mixture layer formed on the first anode mixture layer, and including a second silicon-based active material and a second conductive material, wherein a content of the first silicon-based active material in the first anode mixture layer is lower than a content of the second silicon-based active material in the second anode mixture layer, and a Radial Breathing Mode (RBM) peak is observed in a Raman spectrum obtained from a surface of the second anode mixture layer.

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 composite material, a preparation method thereof and a negative plate. The silicon-based composite material comprises silicon-based composite material particles, the silicon-based composite material particles comprise a porous substrate and silicon particles loaded in pores of the porous substrate, the silicon particles comprise at least one silicon nanoparticle and an oxygen-enriched layer at least partially coating the silicon nanoparticle, the oxygen-enriched layer is made of SiOx, x is more than 0 and less than or equal to 2, and x is more than 0 and less than or equal to 2. And the oxygen content in the oxygen-rich layer is in gradient change along the direction from the center to the surface of the silicon nanoparticle. According to the silicon-based composite material provided by the invention, the plurality of silicon particles taking the silicon nanoparticles as the core and the oxygen-enriched layer as the shell are loaded on the porous substrate, and the oxygen content in the oxygen-enriched layer is in gradient change, so that the conductivity of the silicon-based composite material is improved; moreover, the volume expansion of silicon in the lithium intercalation process can be relieved by utilizing the oxygen-enriched layer with the gradient change of the oxygen content, the expansion rate of the electrode is reduced, and the cycle performance of the battery is further improved.

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.

To provide a negative electrode active material which is capable of increasing the capacity while maintaining the battery characteristics.SOLUTION: There is provided a negative electrode active material including negative electrode active material particles. The negative electrode active material particles each include a porous carbon structure. Silicon and an oxide of silicon are dispersed inside the porous carbon structure. An amorphous low-valence nano silicon oxide is dispersed at least in a surface layer part inside the porous carbon structure. In the low-valence nano silicon oxide, SiOx: x<1.0 is satisfied. Nano silicon having a crystal structure is dispersed at least in a deeper layer portion than the low-valence nano silicon oxide inside the porous carbon structure.SELECTED DRAWING: Figure 1

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.

The invention discloses a waste lithium ion battery silicon-carbon negative electrode material regeneration method and application thereof, and the method comprises the following steps: S1, mixing a waste lithium ion battery silicon-carbon negative electrode material with an alkaline substance, and calcining in a non-oxidizing atmosphere to obtain a calcined mixture; s2, washing the calcined mixture to be neutral, and performing solid-liquid separation to obtain a graphite material and a silicon-containing solution; s3, adjusting the pH value of the silicon-containing solution to a level at which silicate is precipitated, reacting under heating, carrying out solid-liquid separation, and collecting silicic acid precipitate; s4, mixing the silicic acid precipitate with a silicon simple substance, grinding the mixture into micron-scale powder, calcining the micron-scale powder under a vacuum condition, and collecting generated silicon monoxide; and S5, carrying out carbon coating treatment on silicon monoxide and the graphite material prepared in the step S2 to obtain the regenerated silicon-carbon negative electrode material. According to the scheme, the waste silicon-carbon negative electrode material is successfully converted into a high-quality regenerated material, and the material can be directly applied to production and manufacturing of new batteries.

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 method for preparing a pre-lithiated silicon oxide negative electrode material, comprising: S1, adding silicon oxide powder to a sodium alginate solution, stirring evenly, then adding a cross-linking agent solution and stirring to react, to obtain a hydrogel A; S2, heating the hydrogel A under an inert atmosphere to obtain a silicon-carbon composite material B; S3, mixing the silicon-carbon composite material B with a pre-lithium solution and stirring evenly, then spray drying in an inert atmosphere to obtain a pre-lithiated silicon-carbon composite material C; S4, mixing the pre-lithiated silicon-carbon composite material C with a lithium source, and calcining in an inert atmosphere. The pre-lithiated silicon oxide negative electrode material prepared by the present invention has a uniform internal structure and a high pre-lithium amount, has the characteristics of good cycle performance and high first efficiency, and the dense high-conductive carbon layer on the surface of the material can inhibit the expansion of the material during the charge and discharge cycle and reduce side reactions to improve the cycle performance of the material, thereby having the characteristics of both high first efficiency and high cycle performance.

The invention discloses a lithium ion battery silicon-carbon negative electrode composite powder material and a preparation method and a production device.The preparation method of the lithium ion battery silicon-carbon negative electrode composite powder material comprises the following steps that under the vacuum state, inert gas (nitrogen or argon) is introduced for protection, matrix powder is made to be in a fluidized state and heated, and the matrix powder is cooled to the room temperature to obtain the lithium ion battery silicon-carbon negative electrode composite powder material. Silicon source gas or carbon source gas is introduced, the heating temperature is higher than the cracking temperature of the silicon source gas or the carbon source gas, and after the silicon source gas or the carbon source gas is cracked, the surface of the matrix powder is coated with silicon or carbon; when the matrix powder is carbon powder, the introduced gas is silicon source gas; when the matrix powder is silicon powder, the introduced gas is carbon source gas. The nanoscale silicon-carbon negative electrode composite powder material prepared by the invention has the advantages of regular powder shape, high purity, strong interface bonding force between a surface coating material and basic powder, good coating consistency and low energy consumption.

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 discloses a SiO X / Microcrystalline graphite negative electrode material and its preparation method and application; relates to the technical field of lithium battery negative electrode materials. The preparation method comprises using microcrystalline graphite as a matrix material, using a hydrothermal reaction method to in-situ grow nano silicon oxide particles on the surface of microcrystalline graphite and in the gaps between the sheets to form SiO X / microcrystalline graphite composites, and in the SiO X The surface of the microcrystalline graphite composite material is coated with a carbon coating layer with a complete carbon layer structure, and finally a SiO X / Microcrystalline graphite negative electrode material. The technical solution of the present invention uses the structure of microcrystalline graphite flakes with different structural orientations to offset and suppress the stress caused by silicon volume expansion during the charging and discharging process; at the same time, nano-SiO X The particles are filled in the gaps of the microcrystalline graphite flake layers, and the fine flake graphite builds a three-dimensional conductive network structure, improving the SiO X The problem of poor electrical conductivity of particles.

The present application provides a composite negative electrode active material and a preparation method therefor, a negative electrode plate comprising same, a secondary battery and a power consuming device. The composite negative electrode active material comprises a negative electrode active material substrate and a conductive polymer layer on the surface of the negative electrode active material substrate, wherein the cyclic voltammetry curve of the composite negative electrode active material has an oxidation peak within a range of 3.2 V-3.6 V and a reduction peak within a range of 2.1 V-2.6 V. The composite negative electrode active material provided by the present application can combine a low volume expansion, a high capacity per gram and a high initial coulombic efficiency, thus enabling a secondary battery to combine a low volume expansion, a high energy density and a long cycle life.

The invention discloses a copper-clad plate, a resin composition for the copper-clad plate, spherical silicon and a preparation process of the spherical silicon, and belongs to the technical field of copper-clad plates. The spherical silicon is composed of spherical silicon dioxide and zinc molybdate particles growing on the surface of the spherical silicon dioxide in an in-situ dispersion mode, the diameter of the spherical silicon dioxide is smaller than 10 micrometers, D50 ranges from 0.6 micrometer to 6 micrometers, the content of zinc molybdate in the unit area of the surface of the spherical silicon dioxide is 0.03 g / m < 2 > to 1 g / m < 2 >, and the size of the zinc molybdate particles is smaller than or equal to 400 nm. The preparation process comprises the following steps: contacting / mixing spherical silicon dioxide with soluble molybdate and zinc salt in a water-based reaction system; and carrying out in-situ reaction on soluble molybdate and zinc salt on the surface of the spherical silicon dioxide to form spherical silicon chemically coated with zinc molybdate particles. According to the method, the zinc molybdate is directly synthesized on the surface of the spherical silicon dioxide in situ through a hydrothermal method, so that the structural morphology of the obtained spherical silicon and the size of zinc molybdate particles can be effectively controlled, and further it is guaranteed that drill bit abrasion is effectively improved when the copper-clad plate is drilled.

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 coated modified ternary positive electrode material as well as a preparation method and application thereof. The coated modified ternary positive electrode material comprises a ternary positive electrode material core as well as a silicon monoxide layer, a transition layer and a carbon layer which are sequentially coated on the surface of the ternary positive electrode material core, the transition layer is composed of silicon monoxide and carbon. In the coated modified ternary positive electrode material, the surface of the ternary positive electrode material core is sequentially coated with the silicon monoxide layer, the transition layer and the carbon layer which are uniform in component, and the three coating layers effectively prevent interaction between the ternary positive electrode material core and electrolyte, so that side reaction is reduced, and the cycling stability of the battery is improved; in addition, the silicon monoxide layer and the silicon monoxide in the transition layer provide relatively high lithium ion capacity, so that the lithium ion capacity of the coated modified ternary positive electrode material is improved; in addition, the carbon layer has good electronic conductivity, so that the electronic conductivity of the coated modified ternary positive electrode material is improved, and the rate capability is improved.

This crystal contains multiple molecules of a silanol compound represented by formula (1), and exhibits an interaction among the multiple molecules of the silanol compound via a hydrogen bond provided by at least one hydroxy group of the silanol compound.

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 present invention relates to a silicon-carbon composite, a method for manufacturing same, and an anode active material comprising same. The silicon-carbon composite is a silicon-carbon composite including silicon particles and carbon. As the molar ratio of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite satisfies 0.05 to 0.45, 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 can be simultaneously improved.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly relates to a metal-doped modified SiOx-based composite negative electrode material as well as a preparation method and application thereof. According to the preparation method, SiOx is doped and modified by using metal capable of forming an alloy with Li, and metal clusters loaded on the surfaces of particles can enter a solid electrolyte interface (SEI) in an in-situ doping manner in a circulation process, so that the adsorption of lithium ions in an electrolyte and the ion transmission rate on the interface are greatly enhanced in a form of forming an alloy with lithium ions; the interface coupling effect between the silicon-based particles and the single-walled carbon nanotubes can also be promoted; in addition, the metal elements doped into the silicon-based particles can effectively inhibit disproportionation, improve the mass transfer rate in the silicon-based particles, homogenize an ion concentration field and an electric field, reduce stress concentration and effectively improve the cycling stability of the SiOx-based negative electrode.

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.

The present disclosure relates to a silicon composition that may be formed from a gas mixture and a silicon dioxide precursor component. The gas mixture may include a carbon based gas, an oxygen gas, and a hydrogen gas. The silicon composition may include a pure silicon component and a carbon-based nanomaterial composition component. The carbon-based nanomaterial composition component may include silicon dioxide doped nanospheres.

The invention discloses a method for preparing a silicon monoxide material through photovoltaic silicon waste regeneration and application, and belongs to the field of secondary resource recycling. According to the method, photovoltaic cutting waste silicon sludge and silicon dioxide are taken as raw materials, silicon monoxide (SiO) gas is generated through vacuum disproportionation reaction, and a uniform high-purity SiO material is formed by controlling the temperature of a condensation thermal field. According to the preparation method, by utilizing the characteristics of fine granularity, high purity and high activity of the cut waste silicon sludge, the conversion efficiency and uniformity of the SiO product can be remarkably improved, and the SiO product obtained by the preparation method has the characteristics of high purity, good uniformity and the like, and has excellent long-cycle stability when being used as the anode of the lithium ion battery. According to the preparation method, the waste silicon powder is directly regenerated to prepare the SiO product, so that the production cost of SiO can be reduced, value-added cyclic utilization of the waste silicon powder can be realized, the raw material cost is low, the process operation is simple, the practicability is high, and meanwhile, the preparation method also has huge economic benefits and wide application prospects.

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.