791results about "Silicon" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a lithium-doped silicon-carbon composite material, a preparation method thereof, a negative plate and a lithium ion battery. The preparation method of the lithium-doped silicon-carbon composite material comprises the following steps: carrying out reduction reaction and activated pore-forming on a mixed material containing a carbon source, an organic pore-forming agent, a lithium supplement agent and a reducing agent to obtain lithium-doped porous carbon; performing first deposition on the lithium-doped porous carbon and mixed gas containing an inorganic lithium compound and an organic lithium compound; carrying out second deposition on the material obtained after the first deposition and silane gas to obtain a lithium compound doped silicon carbon precursor material; and mixing the lithium compound doped silicon carbon precursor material, an organic metal compound, asphalt and an organic solvent, performing spray drying, and then performing carbonization. According to the preparation method, the initial efficiency and the power performance of the silicon-carbon composite material can be improved.

The invention relates to a graphite silicon carbon composite negative electrode material, a negative electrode plate and a lithium ion battery, and belongs to the technical field of battery negative electrode materials. The graphite silicon carbon composite negative electrode material comprises a graphite inner core and a composite shell layer, the composite shell layer coats the surface of the inner core, the composite shell layer comprises a continuous carbon layer, the carbon layer is of a porous structure, and the porous structure is filled with nano silicon particles. According to the core-shell structure, through a three-stage synergistic mechanism of graphite inner core conductive supporting, porous carbon layer expansion buffering and nanometer silicon capacity contribution, the cycling stability of the negative electrode material is remarkably improved while the high specific capacity is maintained.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a graded ordered silicon-carbon negative electrode material for a lithium ion battery, which comprises the following steps: (S1) mixing phenolic resin and a template agent, calcining, and etching to obtain porous carbon containing macropores; (S2) carrying out cracking and carbon coating on the silicon source gas to obtain nano crystalline silicon containing a carbon coating layer; (S3) mixing the porous carbon with the nano crystalline silicon containing the carbon coating layer, and then carrying out ultrasonic vibration, so that macropores of the porous carbon are filled with the nano crystalline silicon to obtain a silicon-carbon composite material I; (S4) treating the silicon-carbon composite material I by using a carbon-containing sealing agent, and then activating to obtain a silicon-carbon composite material II; and (S5) carrying out vapor phase silicon deposition on the silicon-carbon composite material II to fill the amorphous silicon in the pores of the porous carbon, and then carrying out carbon coating to obtain the graded ordered silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is of a composite structure in which crystalline silicon and amorphous silicon are spatially and orderly distributed, so that the structural stability and the uniform distribution of silicon are realized.

The invention provides a silicon-carbon negative electrode material, a preparation method thereof and a secondary battery. The silicon-carbon negative electrode material comprises a carbon skeleton, nano silicon particles and a carbon coating layer, wherein the carbon skeleton is a complex of carbon nanotubes and amorphous carbon. The amorphous carbon has a hierarchical pore structure, and the hierarchical pore structure comprises 65-85% of micropores and 15-35% of mesopores. At least part of the nanometer silicon particles are contained in the grading hole structure, and the carbon framework is coated with the carbon coating layer. The silicon-carbon negative electrode material has a carbon skeleton with a hierarchical pore structure, volume expansion of nano silicon can be effectively relieved, the cycle performance of the material is improved, and a three-dimensional conductive network constructed by the carbon nanotubes is also beneficial to improvement of the rate capability of the material.

The invention provides a preparation method for preparing porous carbon based on an aerogel method, the porous carbon and application of the porous carbon, and belongs to the technical field of porous carbon material preparation. The preparation method comprises the following steps: mixing polyhydroxy phenol, aromatic aldehyde, acrylamide, graphene oxide and lithium salt according to a mass ratio of 100: (50-200): (5-30): (1-5): (1-5), carrying out hydrothermal reaction at 100-200 DEG C for 1-6 hours, and freeze-drying at-40 DEG C to obtain a hydrogel precursor; and carbonizing the precursor in organic heteroatom gas at 500-800 DEG C, mixing the intermediate with alkali according to the ratio of 100: (100-500), activating at 900-1100 DEG C, pickling and drying to obtain the porous carbon. The conductivity of the product is improved by means of graphene, lithium salt and heteroatoms, and the aerogel method obtains large aperture, has the characteristics of low impedance, high first efficiency and small charge-discharge expansion, and can be efficiently applied to silicon-carbon materials.

One or more aspects of the present disclosure provide methods for recovering and upgrading a secondary battery anode material. The method includes: producing a raw anode material by processing a spent battery material containing a first anode material; purifying the original negative electrode material; and generating a second anode material using the purified raw anode material. In some embodiments, the first anode material includes graphite. And the second negative electrode material comprises a graphite-silicon composite material and / or a graphite-silicon oxide composite material. The second negative electrode material may be a battery-grade negative electrode material that can be directly used for a new battery electrode.

The application provides a negative electrode material and a preparation method thereof and a secondary battery, and relates to the technical field of battery materials. The negative electrode material comprises a silicon-based inner core and a carbon layer coated on the surface of the silicon-based inner core, wherein the silicon-based inner core comprises nanosilicon and a silicate containing a metal element M; the negative electrode material is subjected to section analysis and energy spectrum analysis, and meets the conditions of k1<=10, k2<=5 and 0.1 The preparation method of the negative electrode material comprises the following steps: heating and evaporating pre-disproportionated silicon monoxide material and M metal source material to obtain silicon monoxide gas and metal source gas; mixing and condensing the two kinds of gas to obtain an inner core material; and performing carbon coating treatment to obtain the negative electrode material. In the negative electrode material prepared by the application, the metal silicate effectively separates the nanosilicon domain and the silicon oxide domain, and is uniformly distributed, and the negative electrode material has high initial efficiency and excellent cycle performance.

The invention discloses a photovoltaic waste silicon and recycled carbon composite granulation coating process, and relates to the field of new energy materials. According to the method, high-purity silicon waste sheets recovered from retired photovoltaic modules and carbon materials recovered from electronic wastes are subjected to composite granulation, and a carbon coating layer is formed through heat treatment. The preparation method specifically comprises the steps of raw material pretreatment, mixing, granulation forming, coating carbonization, post-treatment and the like, the prepared silicon-carbon composite particles have good conductivity and structural stability and can be used for lithium ion battery negative electrode materials, and efficient recycling of resources and environment-friendly production are achieved.

The invention relates to the technical field of batteries, in particular to a core-shell material, a preparation method, a negative electrode material and a battery. The method provided by the invention comprises the following steps: processing metal salt raw materials of aluminum, iron, cobalt, nickel, zinc and lanthanum into a high-entropy metal oxide; taking silicon particles as a core layer, gasifying a high-entropy metal oxide, and depositing the gasified high-entropy metal oxide on the surface of the core layer to form a coating layer so as to obtain Si (at) HEO particles; depositing a zinc layer on the Si-coated HEO particles to form a growth layer on the surface of the coating layer, dispersing the Si-coated HEO particles in a Si-coated HEO solvent, adding a zinc nitrate aqueous solution and a 2-methylimidazole aqueous solution for reaction, and growing a shell layer on the growth layer on the surface of the coating layer to obtain Si-coated HEO-ZIF particles; and mixing the acidic solution and the Si (at) HEO (at) ZIF particles to form a secondary pore channel, and separating to obtain the core-shell material. The core-shell material provided by the invention solves the problems of low stress dispersion efficiency, low ion transmission and poor volume expansion rate of the existing core-shell material.

The preparation method comprises the following steps: S1, adding silicon powder, graphite, a carbon source and a pore-forming agent into a solvent to obtain slurry; the pore-forming agent comprises ammonium citrate and polylactic acid; s2, performing spray drying on the slurry to obtain precursor microspheres; s3, the precursor microspheres are subjected to first-stage low-temperature oxidation to form macropores, second-stage medium-temperature melting to form mesopores, third-stage high-temperature carbonization and cooling shaping, the heat preservation temperature of the first-stage low-temperature oxidation is 180-200 DEG C, the heat preservation temperature of the second-stage medium-temperature melting is 340-360 DEG C, the heat preservation temperature of the third-stage high-temperature carbonization is 800-900 DEG C, and the gradient pyrolysis dual-pore-forming silicon-carbon negative electrode material is obtained. Through combined use of ammonium citrate and polylactic acid and control of gradient pyrolysis conditions, synergistic distribution of double-peak gradient pores is formed, and effective improvement of the first effect and the cycle performance can be realized.

The invention discloses a solid electrolyte-coated silicon-carbon composite material and a preparation method thereof, and is characterized in that a negative electrode material has a core-shell structure, the core is metal-doped porous carbon and nano silicon deposited in pores, and the shell is a solid electrolyte complex. The preparation method comprises the following steps: uniformly mixing an emulsifier, a phenolic compound, an aldehyde compound, a cross-linking agent, a metal salt of the cross-linking agent and a template agent, then adding an oxidizing agent for reaction, and preparing metal-doped porous carbon through heteroatom doping and activation; depositing nano silicon through a vapor deposition method, coating the surface of the nano silicon with a solid electrolyte through a liquid phase method, and carbonizing to obtain the solid electrolyte coated silicon-carbon composite material. The obtained material has the characteristics of excellent fast charging performance, high initial efficiency and the like when applied to lithium ion batteries.

The invention discloses a preparation method of sphere-like porous carbon and a silicon-carbon composite material. The preparation method comprises the following steps: uniformly mixing a carbohydrate compound, an inorganic pore-forming agent, a fibrous pore-forming agent and a cross-linking agent solution, spray-drying, carbonizing, activating and pore-forming to obtain secondary particle sphere-like porous carbon, and then depositing nano silicon on the obtained material by a silane cracking method to obtain the silicon-carbon composite material. According to the obtained material, fibrous channels and granular channels in porous carbon are utilized, deposition of nanometer silicon and reduction of expansion are facilitated, meanwhile, a secondary particle structure is adopted, the intercalation and deintercalation path of lithium ions in the charging and discharging process is shortened, and the rate capability is improved.

The present invention discloses a silicon-carbon negative electrode composite material, a preparation method thereof, and an application thereof in lithium-ion batteries. The preparation method comprises: using silicon powder as a raw material to generate silicon vapor in a high-temperature negative pressure environment by physical vapor deposition, and then depositing the silicon vapor on a carbon material substrate in a low-temperature zone under the purge of a carrier gas flow; finally, using hydrocarbon gas as a raw material, a carbon coating layer is formed on the surface of the material by chemical vapor deposition, and finally a silicon-carbon negative electrode composite material is obtained. The silicon-carbon interface inside the silicon-carbon negative electrode composite material is a face-to-face combination connected by Si-C chemical bonds. The strong chemical bond can suppress the volume expansion of silicon during the lithium insertion process, and can also enhance the transfer of electrons / ions at the silicon-carbon interface, effectively enhancing the lithium storage performance of the material as a negative electrode material.

The invention provides a carbon material and a preparation method thereof, a silicon-carbon composite material and a preparation method thereof, a negative electrode and a lithium ion battery, and relates to the technical field of silicon-carbon composite materials. At least one plane is arranged on the surface of each carbon material particle; based on the surface area of the carbon material particles, the total area of the plane accounts for 0.1%-100%. The silicon-carbon composite material is prepared from the carbon material, so that the energy density, the multiplying power and the cycling stability of the lithium ion battery can be improved. According to the invention, the technical problems that the multiplying power is reduced and the cycling stability is reduced due to debonding of the spherical negative electrode material in the cycling process are solved, and the technical effect of improving the multiplying power and the cycling stability of the silicon-carbon composite material is achieved.

This invention provides a material that can serve as a negative electrode active material for manufacturing lithium-ion secondary batteries with excellent capacity and cycle characteristics. [Solution] A negative electrode active material for a lithium-ion secondary battery containing a stacked disordered silicon carbide, an amorphous carbon material, and silicon, wherein the stacked disordered silicon carbide and the silicon are dispersed in the amorphous carbon material such that they have conductive paths with the amorphous carbon material, and the silicon content is 5.0 to 28.0% by mass, with a total amount of 100% by mass, and the stacked disordered silicon carbide content is 21.6 to 57.0% by mass.

To enhance charge and discharge properties of a porous silicon material.SOLUTION: A porous silicon material disclosed herein comprises Si, Al, and a transition metal element M, has a specific surface area of 30 cm2 / g or less according to nitrogen adsorption, is in particulate form, and has a carbon coating layer on the surface.SELECTED DRAWING: Figure 1

According to the silicon powder processing device, a follow-up dust collection mechanism comprises a dust collection pipe, a dust collection opening communicated with the dust collection pipe and a follow-up driving device for driving the dust collection opening to synchronously move along with a laser processing point; the follow-up driving device is a linear module, the linear module comprises a guide rail extending in the machining direction and a sliding block in sliding fit with the guide rail, and the dust suction opening is connected with the sliding block through a fixing frame. The trumpet-shaped flow guide cover at the dust collection opening is better in guidance quality, the wide opening end faces a machining point, the dust collection coverage range is directly enlarged, and the area, prone to dust diffusion, around the machining point can be covered; the narrow opening end is communicated with the dust suction pipe, local negative pressure is directly enhanced through section contraction, dust suction power is improved, and retention and escape of dust in a machining area are reduced. The motion stability of the dust suction inlet moving along with the machining point is directly guaranteed, dust suction position deviation caused by shaking is avoided, it is guaranteed that the dust suction inlet is always aligned with the core area of the machining point, and the stable dust removal effect is maintained.

The invention relates to porous carbon for a silicon-carbon negative electrode material and a preparation method thereof, and the preparation method of the porous carbon for the silicon-carbon negative electrode material comprises the following steps: removing inorganic matters in biochar to less than 100 ppm; the preparation method comprises the following steps: adding biochar and a triblock copolymer F127 into an ethanol solution, and grinding to combine the biochar and the triblock copolymer F127 into a mesostructure to obtain a precursor solution; drying the precursor solution and preparing microsphere particles; adding urea, polyvinyl alcohol and graphene, and uniformly mixing to obtain a porous carbon composite precursor; carbonizing the porous carbon composite precursor; after carbonization is completed, activation is conducted through water vapor, and porous carbon is obtained after activation is completed. According to the porous carbon for the silicon-carbon negative electrode material and the preparation method, the biochar is used as a carbon source, the raw material price is low, and the production cost is reduced.

The invention discloses a preparation method and application of a liquid-phase-coated surface-passivated silicon-carbon negative electrode material based on a fluidized bed product, and belongs to the field of battery negative electrode materials.The preparation method of a silicon-carbon negative electrode comprises the steps that a, the silicon-carbon negative electrode material prepared through a fluidized bed is placed in a fluidized bed reactor; fluidizing gas is introduced, so that the silicon-carbon negative electrode material is in a fluidized state; b) atomizing a coating agent solution containing a carbon precursor and a solvent, and spraying the atomized coating agent solution into the fluidized bed reactor to uniformly coat the surface of the silicon-carbon negative electrode material with the coating agent solution; and c) carrying out heat treatment on the coated silicon-carbon negative electrode material, and converting the carbon precursor into a carbonaceous passivation layer. The method has the advantages of low cost, high efficiency and high quality.

The invention relates to a preparation method of a high-capacity silicon-carbon composite negative electrode material, which comprises the following steps: preparation of electronic-grade hydrochloric acid, preparation of a photovoltaic waste silicon powder ball mill, preparation of a silicon-coated calcium carbonate core-shell structure material, preparation of a gradient carbon coating layer, synthesis preparation of a carbon nanotube conductive network, preparation of a graphene nanobelt silicon-carbon composite material and the like. The preparation method creatively combines a two-step electrostatic attraction self-assembly method, a high-temperature oxidation process and other preparation methods, the prepared silicon-carbon composite material shows stable cycle performance and high capacity performance, and the silicon-carbon composite material has the advantages of high specific capacity and low impedance.

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 present invention relates to a graphene composite having a structure in which a plurality of primary fine particles and multilayer graphene are mixed, and a hybrid graphene composite particle including secondary fine particles surrounded or coated with the graphene composite, wherein the primary fine particles are attached to the surface or inside of the multilayer graphene, and a portion of the vacant spaces between the primary fine particles are filled with the graphene composite, thereby forming an interconnected structure.

The invention relates to the technical field of electrode paste, in particular to high-density corrosion-resistant electrode paste and a preparation method thereof. The preparation method comprises the following steps: performing plasma etching on anthracite and petroleum coke, coating carbon nanotubes to form a conductive network, and performing silane modification on crystalline flake graphite powder to reinforce an aggregate interface; carboxylated carbon quantum dots are modified by acylamino and then form a composite adhesive with polyimide, medium-temperature pitch and an aluminate coupling agent, on one hand, the acylamino of the carbon quantum dots and the imide group of the polyimide form a strong pi-pi conjugation effect to improve the interface bonding force, and on the other hand, the aluminate coupling agent bridges the bone material and the adhesive interface to improve the bonding force of the bone material and the adhesive. The infiltration effect is improved; tiB2 and boric acid in the composite antioxidant form a stable protective film at a high temperature to inhibit oxidation; in addition, the silicon powder is coated with a carbon layer, so that the volume expansion reaction of silicon is delayed by the carbon layer; all the components cooperate with one another, and the bottleneck that compactness and corrosion resistance of traditional electrode paste are difficult to consider at the same time is solved.

The invention provides a nitrogen-fluorine double-element doped porous carbon material, a silicon-carbon negative electrode material and a preparation method thereof, and the preparation method of the porous carbon material comprises the following steps: mixing porous carbon with ammonium fluoride and / or ammonium bifluoride, and carrying out vapor deposition coating or liquid phase coating; and calcining the coated porous carbon material in a closed environment in an inert atmosphere to obtain the nitrogen-fluorine double-element doped porous carbon material. According to the invention, by utilizing the characteristics of nano-scale micropores and super-large specific surface of porous carbon and the properties of low melting point and low boiling point of ammonium fluoride and ammonium bifluoride, a uniformly coated ammonium fluoride and ammonium bifluoride coating layer is obtained by adopting a vapor deposition or liquid phase coating method, and then the porous carbon material is obtained by utilizing high-temperature calcination treatment. According to the present invention, the characteristics of high specific surface and nano-scale micropores can be simultaneously retained, and after the silicon-carbon negative electrode material is prepared, the expansion of the silicon-carbon negative electrode material is substantially reduced, the cycle performance of the material is ensured, and the rate capability of the obtained silicon-carbon negative electrode material is improved.

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 invention provides a silicon-carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: adding silicon tetrachloride and calcium carbide into a carbon tetrachloride solution, uniformly stirring, and transferring into a high-pressure reaction kettle for reaction to obtain a Si-C precursor; adding the obtained Si-coated C precursor into absolute ethyl alcohol and carrying out ball milling treatment; and carrying out suction filtration and drying on the material obtained by ball milling, calcining and carbonizing in inert gas, and cleaning the obtained product to obtain the silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is used for preparing a negative electrode material of a lithium ion battery, has good cycle performance, has relatively high reversible specific capacity and first coulombic efficiency, and is excellent in overall electrochemical performance.

The invention discloses petroleum coke, a silicon carbon material, a silicon composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out first solid removal treatment on a first heavy oil raw material to obtain first purified heavy oil; carrying out second solid removal treatment on the second heavy oil raw material to obtain second purified heavy oil; mixing the second purified heavy oil with nano-porous silicon to obtain third purified heavy oil and heavy oil containing nano-porous silicon; carrying out spray granulation on the heavy oil containing the nano porous silicon to obtain a silicon-carbon precursor and fourth purified heavy oil; mixing the third purified heavy oil, the fourth purified heavy oil and the first purified heavy oil to obtain heavy mixed oil; carrying out distillation, pyrolysis and modification treatment on the heavy mixed oil to obtain petroleum coke; carbonizing the silicon-carbon precursor to obtain a silicon-carbon material; the silicon composite negative electrode material is prepared from petroleum coke and a silicon carbon material. The petroleum coke and the silicon carbon material with relatively high quality can be prepared, and the electrochemical performance of the negative electrode material can be improved.

The present exemplary embodiments relate to a silicon-based negative electrode active material, a method of preparing the same, and a lithium secondary battery including the same. The silicon-based negative electrode active material according to an exemplary embodiment may have a particle size fraction D1 of 1 µm or more, a D99 of 20 µm or less, and a degree of oxidation of 0.3% to 3.0%.

The application provides a method for preparing a silicon negative electrode material by using SiF4 as a raw material, and belongs to the field of battery negative electrode materials. The method for preparing the silicon negative electrode material by using SiF4 as the raw material can simultaneously obtain microcrystalline silicon and amorphous silicon by using silicon tetrafluoride as a silicon source, controlling the placement position of a substrate, the radio frequency power of an inductive radio frequency coil and the temperature of a reaction zone; and the silicon material capable of meeting the use of a lithium ion battery negative electrode can be further obtained by controlling the proportion of silicon tetrafluoride, hydrogen and argon. The method provided by the application can simultaneously obtain microcrystalline silicon and amorphous silicon, and the lithium ion battery prepared from the microcrystalline silicon and the amorphous silicon has good cycle life and coulomb efficiency, and can be used as a negative electrode material.