634results 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.

The invention discloses a method for simultaneously extracting lithium and silicon from a lithium-containing mineral, which comprises the following steps: carrying out reduction reaction on the lithium-containing mineral under the action of a metal reducing agent to prepare a reduction product, and carrying out atmosphere ball milling and water leaching on the reduction product in an inert gas atmosphere to obtain a lithium-rich water leaching solution and a first solid; carrying out first dilute acid leaching on the first solid to obtain a lithium-rich pickle liquor and a second solid; obtaining a silicon nanomaterial from the second solid; the lithium-rich pickle liquor or a mixture of the lithium-rich pickle liquor and natural minerals and an alkali solution are dropwise added into water at the same time, stirring is conducted, pH is regulated and controlled, heating stirring is conducted for a period of time for dynamic crystallization, then static crystallization is conducted, and solid-liquid separation is conducted to obtain lithium-rich supernate and a third solid; a layered multi-metal hydroxide is obtained from the third solid. According to the method, a lithium extraction process and a silicon nano material preparation process are coupled, elements such as lithium and silicon in minerals are fully utilized, comprehensive utilization of the elements is realized, waste of resources is avoided, and economic benefits are greatly 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 relates to the technical field of photovoltaic crystalline silicon waste treatment, and discloses a method for preparing a lithium-rich silicon monoxide negative electrode material from photovoltaic crystalline silicon waste, and the method comprises the following steps: step 1, crushing and granulating the photovoltaic crystalline silicon waste; 2, preparing silicon monoxide particles; step 3, preparing lithium-rich silicon monoxide particles; step 4, preparing carbon-coated lithium-rich silicon monoxide particles; and 5, constructing a conductive network of the carbon-coated lithium-rich silicon monoxide particles to obtain the carbon-coated lithium-rich silicon monoxide negative electrode material with the three-dimensional conductive network. According to the scheme, high-value utilization is carried out on the photovoltaic silicon crystal waste, and the problem of subsequent treatment of solid waste is solved; the source pressure of the silicon-based negative electrode material is effectively relieved, and the preparation cost pressure of the silicon-based negative electrode material is reduced; the problems of low initial coulombic efficiency, obvious volume expansion, poor conductivity and the like of the silicon-based negative electrode material are solved by carrying out pre-lithiation, carbon coating, net coating, doping and the like on the material.

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 discloses a silicon monoxide-based negative electrode material and preparation and application thereof, and belongs to the technical field of lithium ion battery preparation, and the preparation method comprises the following steps: bombarding pure silicon monoxide powder by nitrous oxide plasma to form N-attached modified porous silicon monoxide powder; more lithium ions can be accommodated for intercalation and deintercalation due to the porosity, the volume effect of the material in the electrochemical reaction process can be relieved, so that the cycle life of the battery is prolonged, and meanwhile, the N element is doped in the generated carbon layer, so that the conductivity and the lithium storage capacity are improved; the two prepared coating layers form a compact carbon coating layer after high-temperature carbonization, the structural integrity of the silicon monoxide negative electrode material in the charging and discharging process is enhanced, the compact carbon coating layer can effectively relieve stress caused by volume change and reduce repeated generation and fracture of an SEI film in the embedding and de-embedding process of lithium ions, and the lithium ion battery has the advantages of being simple in preparation process, low in cost and high in reliability. The first coulombic efficiency is improved, and the capacity and performance stability of the battery can be maintained.

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 SiOX / microcrystalline graphite negative electrode material and a preparation method and application thereof. Relates to the technical field of lithium battery cathode materials. The preparation method comprises the following steps: by taking microcrystalline graphite as a base material, growing nano silicon oxide particles in situ on the surface of the microcrystalline graphite and in gaps of sheet layers by adopting a hydrothermal reaction method to form a SiOX / microcrystalline graphite composite material, and coating the surface of the SiOX / microcrystalline graphite composite material with a carbon coating layer with a complete carbon layer structure, and finally, the SiOX / microcrystalline graphite negative electrode material with the core-shell structure is formed. By adopting the technical scheme, the stress effect caused by silicon volume expansion in the charging and discharging process is counteracted and inhibited by utilizing the disordered layer structure characteristic that the structure orientation of fine scales of the microcrystalline graphite is different; meanwhile, the nano SiOX particles are filled in the gaps of the microcrystalline graphite flake layer, and the fine flake graphite constructs a three-dimensional conductive network structure, so that the problem of poor conductivity of the SiOX particles is solved.

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 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 present invention relates to a silicon-carbon composite material, a method for manufacturing the silicon-carbon composite material, and a negative electrode active material comprising the silicon-carbon composite material. The silicon-carbon composite material is a silicon-carbon composite material containing silicon particles and carbon. Since the molar ratio of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite material satisfies 0.05 to 0.45, when the silicon-carbon composite material is applied to a negative electrode active material, it is possible to simultaneously improve the discharge capacity, initial efficiency, and capacity retention after circulation of a lithium secondary battery.

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.

An anode material, a preparation method thereof, and a lithium ion battery provided. The anode material includes a core of a silicon-based material and a first coating layer coating on at least part of surface of the core of the silicon-based material, where first coating layer has an undulation y of 1≥y≥0.10, and the undulation y of the first coating layer is expressed by Formula (I):y=1-exp⁢ (-(Rmax-Rmin)D⁢50×C)(I)where, Rmax is a maximum thickness (nm) of the first coating layer, Rmin is a minimum thickness (nm) of the first coating layer, D50 is a median particle size (μm) of the anode material, and C is a mass ratio (%) of the first coating layer in the anode material. The anode material of the present disclosure has properties of excellent conductivity, cycling performance, and rate performance, and can suppress occurrence of irreversible expansion.

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.

The present invention is directed to a method for producing an agglomerated lignin-silicon composite material. The method involves the steps of mixing lignin in powder form, at least one silicon-containing active material in powder form and optionally at least one additive; compacting the mixture; and crushing the compacted composite material to obtain an agglomerated lignin-silicon composite material. The invention is also directed to a granular carbon-silicon composite material obtained by heat treatment of the agglomerated lignin-silicon composite material.