98 results about "Silicon nanoparticle" patented technology

The invention provides a sphere-like silicon-carbon negative electrode material and a preparation method and application thereof, and particularly relates to the technical field of negative electrode materials, the negative electrode material comprises a sphere-like porous carbon skeleton, silicon nanoparticles distributed in the sphere-like porous carbon skeleton, and an amorphous carbon layer coating the surface of the sphere-like porous carbon skeleton, the particle appearance of the sphere-like porous carbon skeleton is of a round irregular or asymmetric polyhedral structure and comprises one or more of a potato shape, an ellipse shape, an olive shape, a long strip shape and a pomegranate shape, the particle of the sphere-like porous carbon skeleton is provided with a plurality of asymmetric faces, fillets are formed between the faces, and the radius of the fillets does not exceed 20 microns. The problem of structural damage of the material under the action of external force such as rolling can be effectively relieved, good mechanical stability is kept, excellent bonding performance can be achieved in the electrode coating process, the ion transmission path of the material is improved, and the electronic conductivity and the lithium ion diffusion performance are improved.

The invention discloses a porous silicon-carbon composite negative electrode material, a one-step preparation method, a lithium ion battery and application, and belongs to the technical field of lithium ion battery materials, the method comprises the following steps: mixing a silicon source, magnesium powder, a carbon source and a soluble pore forming agent to obtain mixed powder; performing high-energy mechanical ball milling on the mixed powder in an inert atmosphere, and performing acid pickling, high-temperature carbonization treatment, cooling, water washing, suction filtration and drying to obtain the porous silicon-carbon composite negative electrode material; the porous silicon-carbon composite negative electrode material comprises a porous shell formed by amorphous porous carbon and a porous core formed by silicon nanoparticles embedded in the porous shell, the mechanical collision energy generated in the high-energy mechanical ball milling process triggers the low-temperature magnesiothermic reduction reaction between the silicon source and the magnesium powder, the carbon source is attached to the surfaces of silicon particles while the silicon particles are generated, and silicon synthesis, carbon coating and pore forming are synchronously achieved. The silicon-based negative electrode has the advantages of high initial coulombic efficiency, high specific capacity, excellent cycle stability and rate capability, and effectively solves the problems of volume expansion and large-scale preparation of the silicon-based negative electrode.

The invention discloses a solid-state battery negative electrode material and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The preparation method comprises the following steps: uniformly mixing silicon nanowires, silicon nanoparticles, a carbon nanofiber precursor material and a solvent, preparing a negative electrode material precursor by adopting electrostatic spinning, and carrying out pre-oxidation treatment and carbonization treatment to prepare the solid-state battery negative electrode material, wherein the mass ratio of the silicon nanowires to the silicon nanoparticles is 1: (0.1-4). According to the invention, the silicon nanowires and the silicon nanoparticles are cooperated, and the carbon nanofibers are used as a carrier to form a three-dimensional network structure, so that the diffusion path, anisotropic stress distribution and crushing resistance of Li can be shortened, the cycle performance is improved, and the carbon nanofibers not only improve the mechanical stability of Si in the cycle process, but also provide good conductivity for the electrode. The problems of volume change and low conductivity of the silicon negative electrode material in the use process are effectively solved, and the interface stability of the silicon negative electrode material and a solid electrolyte material is enhanced.

The invention provides a spherical silicon-based composite material and a preparation method thereof, a negative electrode and a battery, and relates to the technical field of silicon-based composite materials, the spherical silicon-based composite material comprises phenolic resin microspheres, a conductive agent and silicon nanoparticles, the phenolic resin microspheres are doped with the conductive agent to form a matrix of the spherical silicon-based composite material, and the silicon nanoparticles are doped with the conductive agent to form the spherical silicon-based composite material. The phenolic resin microspheres are of a regular spherical structure, grooves or protrusions or the combination of the grooves and the protrusions are arranged on the outer surfaces of the phenolic resin microspheres, the conductive agent is evenly dispersed in the phenolic resin microspheres, and part of the conductive agent is dispersed on the outer surfaces of the phenolic resin microspheres. The matrix is activated to form porous carbon microspheres with discontinuous porous channels or pores, and the silicon nanoparticles are deposited in the porous channels or pores. The problems that the ion conduction rate of the spherical silicon-based composite material is reduced and the conductivity is reduced can be solved, so that the first efficiency and the cycle stability of the spherical silicon-based composite material are improved.

The invention provides a silicon-based negative electrode material and a preparation method and application thereof, and particularly relates to the field of negative electrode materials, the negative electrode material comprises an inner core and a coating layer coating the surface of the inner core, the inner core is composed of a porous carbon matrix and silicon nano-particles deposited in pore channels of the porous carbon matrix, the coating layer is a short-range ordered high-texture carbon layer, and the coating layer is a silicon nano-particle coating layer. The thickness of the high-texture carbon layer is 0.5-30 nm, the length-diameter ratio of the carbon lines is 1-10, and the interlayer spacing is 0.33-0.37 nm. According to the technical scheme, through the synergistic effect of the surface oxygen passivation layer and the high-texture carbon coating layer formed at a high temperature, silicon volume expansion is effectively inhibited, side reactions are reduced, and meanwhile the electrode conductivity and cycling stability are remarkably improved.

The application relates to a composite sodium ion battery anode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The preparation method comprises the following steps: S1, dissolving polyacrylonitrile and tetrabutyl titanate in a solvent II, uniformly mixing to obtain a shell layer solution; dissolving multi-walled carbon nanotubes and styrene-acrylonitrile copolymer in a solvent III, uniformly mixing to obtain a core layer solution; stirring and heating gallium, silicon and silicon dioxide, then adding a solvent I to obtain gallium-silicon nanoparticles through ultrasonic treatment, adding the gallium-silicon nanoparticles into the core layer precursor solution to obtain an intermediate layer solution; S2, performing three-axis electrostatic spinning on the three solutions through a concentrically shaped channel nozzle to obtain a composite film; and S3, carbonizing the composite film to obtain the composite sodium ion battery anode material. The composite sodium ion battery anode material can make the electrode have high capacity and excellent cycle stability, prolong the service life of the battery, and is a self-healing and self-repairing battery anode.

The present invention relates to a silicon-nanographite aerogel for use as an anode in a battery, such as a lithium ion battery, comprising a matrix of nanographite flakes consisting of a mixture of graphene, multilayer graphene and graphite nanoplatelets, and silicon nanoparticles having a diameter between 1 nm and 100 nm, whereby the aerogel has a three-dimensional structure with pores between the flakes, whereby the specific surface area accommodates a volume expansion of the silicon nanoparticles of at least 400% during lithiation, and wherein the surfaces of the nanographite flakes are for 10 to 90% covered with nanoparticles of silicon or wherein the aerogel has a specific surface area between 10 and 500 m2 / g as measured using a BET (Braunauer-Emmett-Teller). The invention also relates to a method of making the aerogel and an electrode comprising the aerogel.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

This application provides fluorescent silicon nanoparticles, their preparation method, and a water-soluble fluorescent anti-counterfeiting ink, relating to the field of silicon nanomaterials technology. The preparation method of the fluorescent silicon nanoparticles includes: mixing and reacting a silicon source, a reducing agent, and water to obtain the fluorescent silicon nanoparticles; wherein the silicon source includes 3-aminopropyltriethoxysilane; and the reducing agent includes humic acid. The fluorescent silicon nanoparticles prepared in this application appear green under 365nm ultraviolet light irradiation and can be applied to water-soluble fluorescent anti-counterfeiting inks. This application uses a low-cost, simple, readily available, rapid, convenient, and mild preparation method to prepare fluorescent silicon nanoparticles with excellent acid and alkali resistance, light resistance, and salt resistance. When applied to fluorescent anti-counterfeiting inks, they can produce clear and bright fluorescent patterns.

This invention relates to a silicon-based anode material with a self-healing layer, its preparation method, and its application, belonging to the field of lithium-ion battery technology. By mixing and drying silicon nanoparticles, a carbon source, and a gallium source in the liquid phase, followed by a one-step high-temperature annealing, a hierarchical structure of "core-buffered intermediate layer-shell" is obtained. This structure consists of a silicon nanoparticle core, a gallium oxide intermediate layer covering the core surface, and a carbon shell layer covering the intermediate layer. The in-situ transformation and alloying reaction of the gallium oxide intermediate layer during lithium intercalation buffers the expansion stress of the internal silicon core, fundamentally preventing the outermost carbon shell from cracking. Simultaneously, the liquid metal network generated in the intermediate layer bridges the broken silicon particles, achieving self-healing of the electrode, thereby achieving high specific capacity, long cycle life, and low macroscopic expansion rate.

A negative electrode active material comprising: a composite that includes a carbon-based material and silicon nanoparticles. The silicon nanoparticles have a pipe-shaped structure extending in one direction by a length. A wall portion of the silicon nanoparticles includes an inner wall forming a through hole having a diameter, and the wall portion has a thickness from the inner wall to an outer wall. Also disclosed is a negative electrode comprising a current collector having a negative electrode active material layer comprising the negative electrode active material on it. Further disclosed is a rechargeable lithium battery comprising the negative electrode and a positive electrode.

This invention relates to the preparation and application of silicon-carbon anode materials, and discloses a silicon-carbon anode material modified with lithium phosphide nanoparticles, its preparation method, and a secondary battery. The material has a core-shell structure, with the core comprising porous carbon and lithium phosphide nanoparticles and silicon nanoparticles generated in situ within the micropores of the porous carbon; the shell comprises a composite coating layer composed of amorphous carbon and carbon nanotubes; silicon accounts for 45-65 wt% of the modified silicon-carbon anode material by mass, and the P / Si molar ratio of the lithium phosphide nanoparticles to the silicon nanoparticles is 2:98~30:70. A small amount of phosphorus source is first deposited in the porous carbon micropores, followed by lithiation treatment to convert the phosphorus in the porous carbon into lithium phosphide nanoparticles, then a second deposition of silicon nanoparticles, and finally overall carbon coating. This invention's modified silicon-carbon anode material improves the problem of rapid impedance increase in the low-charge range of silicon-carbon anode materials, significantly enhancing the user experience.

The present invention provides a lubricant additive composition for reducing a friction coefficient and improving wear resistance, and more specifically, the lubricant additive composition is characterized by containing an emulsion solution in which silicon nanoparticles, zinc nanoparticles, and cerium nanoparticles are dispersed. As described above, the lubricating oil additive containing the emulsion solution in which the silicon, zinc, and cerium nanoparticles are dispersed reduces the friction coefficient of the lubricating oil, thereby improving fuel efficiency, reducing exhaust gas, and improving the lifespan of a vehicle.

According to an exemplary embodiment of the present invention, a silicon-carbon composite that can improve the lifespan characteristics of a secondary battery is provided. The silicon-carbon composite is a silicon-carbon composite for use as a negative electrode active material, comprising a carbon matrix and silicon nanoparticles trapped in the carbon matrix, wherein the surface roughness (Rq) of the silicon-carbon composite can be 4-50 nm.

A negative electrode active material for a lithium secondary battery, according to the present invention, includes a silicon-carbon composite including silicon nanoparticles and a carbon-based matrix, wherein the silicon-carbon composite includes 0.5-7 parts by weight of polyvinyl butyral (PVB) based on 100 parts by weight of the silicon nanoparticles.

A negative electrode active material for a lithium secondary battery according to the present invention includes a silicon-carbon-based composite including: silicon nanoparticles; a carbon-based matrix; and a conductive additive, wherein the content of the conductive additive may be 0.2-10 wt% relative to the silicon nanoparticles in the composite.

A lithium-ion solid-state battery component includes an electrode with a current collector and a silicon-based active layer. The active layer is made of silicon nanoparticles encapsulated within an interwoven carbon nanotube network. The carbon nanotube network is configured to maintain electrical connectivity and mechanically stabilize the silicon nanoparticles during volume expansion and contraction of the electrode during charge cycling.

The invention relates to the technical field of gas separation, and discloses a composite hollow fiber membrane for efficient separation of ship tail gas SO2, and the composite hollow fiber membrane comprises the following components in parts by weight: 8-12 parts of polyether sulfone, 1-3 parts of montmorillonite, 0.5-2 parts of silicon nanoparticles, 0.1-1 part of a carbon nanomaterial, 0.5-2 parts of polyvinyl alcohol and 5-15 parts of a functional compound, the invention also provides a preparation method of the composite hollow fiber membrane for efficient separation of SO2 in ship tail gas, and the preparation method comprises the following steps: adding polyether sulfone, montmorillonite silicon nanoparticles, a carbon nanomaterial and polyvinyl alcohol into a proper amount of solvent to form a mixture solution, and stirring the mixture at 60-80 DEG C for 3-6 hours to prepare a composite solution. According to the composite hollow fiber membrane disclosed by the invention, the gas separation efficiency is remarkably improved by optimizing the formula and structural design of the material, and the selectivity of the membrane is enhanced by the introduced nano carbon material and montmorillonite.

This invention belongs to the field of food and agricultural product safety testing technology, specifically relating to a rapid detection method for parathion and its application. Based on the parathion-induced blue shift in fluorescence of silicon nanoparticles, ascorbic acid is reacted with 3-aminopropyltriethoxysilane to generate green fluorescent silicon nanoparticles. During the formation of silicon nanoparticles, parathion can embed itself into the porous structure of the silicon nanoparticles through host-guest interactions, causing a change in the excited state of the silicon nanoparticles. This affects the fluorescence emission of the silicon nanoparticles, resulting in a blue shift in the fluorescence emission peak, changing from green fluorescence to blue fluorescence, specifically manifested as an increase in fluorescence intensity at 422 nm and a decrease in fluorescence intensity at 520 nm. By establishing the relationship between ratiometric fluorescence signal or fluorescence color change and parathion concentration, specific detection of parathion is achieved. This invention requires no enzymes or antibodies for parathion detection, is inexpensive, fast, easy to operate, highly sensitive, and has good specificity.

This application relates to metallized silicon oxide active materials and methods of forming the same. Active material particles for lithium ion secondary batteries each include: a primary phase comprising lithium silicate; silicon nanoparticles disposed in the primary phase; and a nitrogen-based species.

The present disclosure relates to novel multifunctionalized silicon nanoparticles, to processes for their preparation and to compositions comprising the novel multifunctionalized silicon nanoparticles. The disclosure also relates to the use of the novel multifunctionalized silicon nanoparticles in electrochemiluminescence based detection methods and in the in vitro detection of an analyte. In particular, the disclosure relates to methods for measuring an analyte by in vitro methods employing the novel multifunctionalized silicon nanoparticles.

The present invention relates to a lithium secondary battery negative electrode active material and a method for preparing the same, the lithium secondary battery negative electrode active material comprising: a silicon-carbon composite core part having a structure in which silicon nanoparticles and crystalline carbon particles are bonded within an amorphous carbon matrix; and an amorphous carbon coating layer on the core portion, the average particle diameter of the crystalline carbon particles being 8 [mu] m to 10 [mu] m, and the bulk density of the crystalline carbon particles being 0.2 g / cc or less.

The present disclosure relates to novel multifunctionalized silicon nanoparticles, to processes for their preparation and to compositions comprising the novel multifunctionalized silicon nanoparticles. The disclosure also relates to the use of the novel multifunctionalized silicon nanoparticles in electrochemiluminescence based detection methods and in the in vitro detection of an analyte. In particular, the disclosure relates to methods for measuring an analyte by in vitro methods employing the novel multifunctionalized silicon nanoparticles.

A solid-state lithium-ion battery component includes an electrode with a current collector and a silicon-based active layer. The active layer is made of silicon nanoparticles encapsulated within an interwoven carbon nanotube network. The carbon nanotube network is configured to maintain electrical connectivity and mechanically stabilize the silicon nanoparticles during volumetric expansion and contraction of the electrode throughout charge cycling.

A method for passivating silicon nanoparticles, the method comprising: synthesizing silicon nanoparticles containing free radicals in a plasma reactor; trapping the silicon nanoparticles in a trapping fluid composition comprising a trapping fluid and a free radical reactive compound under vacuum to form a trapped silicon nanoparticle composition comprising the trapping fluid, silicon nanoparticles, and the radical reactive compound; and reacting the radical reactive compound with the free radicals of the silicon nanoparticles to produce a passivation composition comprising passivated silicon nanoparticles and the trapping fluid.

The invention discloses a diatom-based composite material loaded with silicon nanoparticles as well as preparation and application of the diatom-based composite material. In the preparation process of the material, silicon nanoparticles are loaded on the surface and the pore structure of a silicon carbide algae shell with a hollow porous structure, and the material is prepared into the lithium ion battery negative electrode material. The hollow porous structure of the diatom shell provides enough buffer space for the volume expansion of the Si nanoparticles, and the amorphous carbon layer on the surface of the diatom shell can also improve the conductivity of the composite material and improve the initial coulombic efficiency; and the unique hollow porous structure of the diatom shell can accelerate the diffusion speed of lithium ions and improve the rate capability of the silicon negative electrode. The preparation method has the advantages of simple and efficient process, greenness and low consumption, and provides a new path for the development and research of the Si / SiO2 / C composite negative electrode material.

This invention discloses a silicon-carbon anode material with silicon nitride-doped hard carbon coating on silicon nanoparticles, its preparation method, anode sheet, and lithium-ion battery. It uses silicon nanoparticles as the core structure and utilizes silicon nitride-doped hard carbon to synergistically coat the silicon nanoparticles, solving the problems of weak interfacial bonding between the carbon coating layer and silicon nanoparticles, low mechanical strength, and inability to adapt to long-term volumetric cycling expansion. The prepared silicon-carbon anode material has advantages such as long cycle life, high initial efficiency, and good conductivity when used as a lithium-ion battery anode material.

This invention discloses a negative electrode sheet, its preparation method, and a battery. The preparation method includes mixing silicon nanoparticles with a graphene oxide dispersion to prepare a mixed dispersion, then adding a crosslinking agent and mixing evenly, and then coating it onto a substrate to obtain a wet film; then immersing the wet film in a poor solvent of graphene oxide, drying it to obtain a wrinkled composite film, and then reducing it to obtain the negative electrode sheet. The above method, through the addition of a crosslinking agent, enables interlayer crosslinking of the graphene oxide sheet, thereby improving the overall conductivity and structural stability of the electrode; by immersing the wet film in a poor solvent of graphene oxide to replace the graphene oxide dispersion solvent in the wet film, the graphene oxide can be transformed from its original stretched state to a contracted and wrinkled state, resulting in a negative electrode sheet containing a large amount of wrinkled graphene. This wrinkled graphene can effectively suppress silicon volume expansion, maintain the integrity of the electrode structure, and thus effectively improve the conductivity and cycle performance of the silicon-based negative electrode sheet.

The present invention relates to a negative active material comprising a silicon composite material including: a core formed by coating a first crystalline carbon on the surfaces of needle-shaped silicon nanoparticles and plate-shaped silicon nanoparticles having different aspect ratios; and a shell surrounding the core and containing amorphous carbon, in which a second crystalline carbon is located on the entire surface or a part of the surface of the shell, a method for preparing the same, and a lithium secondary battery comprising the same to have excellent life characteristics, output characteristics, and safety.