884 results about "Amorphous carbon" patented technology

The invention discloses a LiAlO2 fast ion conductor coated silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The LiAlO2 fast ion conductor coated silicon carbon composite material has a core-shell structure; an inner core of the composite material is a silicon-carbon composite material, the silicon-carbon composite material is formed by coating a three-dimensional carbon material with an amorphous carbon layer and loading a nano silicon compound, a shell of the composite material is a LiAlO2 fast ion conductor layer, and the silicon-carbon composite material with a three-dimensional network structure is constructed, and the surface of the silicon-carbon composite material is coated with the LiAlO2 fast ion conductor layer, so that the composite material is obtained. According to the present invention, with the LiAlO2, the volume expansion of the nanometer silicon during the charge-discharge process can be effectively relieved, the stability of the silicon-carbon composite material structure can be improved so as to significantly improve the cycle performance of the battery, and the LiAlO2 can provide the rapid channel for the transmission of the lithium ion during the charge-discharge process so as to improve the rate performance of the battery;

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 high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention relates to the technical field of electrode materials, and discloses a preparation method of a lithium iron manganese phosphate material and a lithium ion battery. The lithium iron manganese phosphate material is prepared by the following steps: performing in-situ growth in a cavity of polyethylene glycol-sucrose hybrid aerogel with a three-dimensional porous network structure to form a manganese iron phosphate precursor; the hybrid aerogel can control excessive agglomeration and disordered growth of ferromanganese phosphate precursor particles and avoid particle agglomeration, so that the finally formed lithium ferromanganese phosphate material particles are finer and more uniformly distributed, and an amorphous carbon-aluminum layer is formed during later calcination, so that the performance of the material is improved. The surface of lithium manganese iron phosphate particles is tightly coated with the composite material, electron transmission can be accelerated, particle pulverization can be reduced, meanwhile, corrosion of corrosive components in electrolyte can be inhibited, interface side reactions such as transition metal ion dissolution can be reduced, and finally the conductivity and cycling stability of the lithium ion battery are remarkably improved.

The invention discloses a silicon-carbon composite material and a preparation method thereof. The composite material is composed of porous hard carbon, inorganic lithium salt doped with the porous hard carbon and a porous metal frame as a matrix, nano silicon deposited in pores of the matrix, and an amorphous carbon composite material coated on the surface. The preparation method comprises the following steps: uniformly mixing resin, inorganic lithium salt and a porous metal framework, and carrying out hydrothermal reaction, activation and secondary carbonization to obtain a porous carbon complex; and depositing nano silicon and coating the nano silicon with an organic lithium salt through a vapor deposition method to obtain the silicon-carbon composite material. According to the obtained material, expansion is reduced through large-aperture deposited nanometer silicon of the metal frame structure, the defects are reduced through the inorganic lithium salt of the inner core and the organic lithium salt of the outer shell, the ion diffusion rate is increased, and the first efficiency and the rate performance are improved.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

Disclosed is a negative electrode including a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a conductive agent. The negative electrode active material includes carbon-based active material particles including natural graphite and an amorphous carbon-based material. The carbon-based active material particles have a specific surface area of 1.4 m2 / g to 2.3 m2 / g, and the conductive agent includes carbon nanotubes having an average length of 1 μm to 12 μm. A secondary battery including the negative electrode is also disclosed.

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 discloses a high-potential-corrosion-resistant composite coating as well as a preparation method and application thereof. The high-potential-corrosion-resistant composite coating comprises a metal transition layer, a graphite-like amorphous carbon layer and a SnO2 hole sealing layer which are sequentially formed on the surface of the metal bipolar plate serving as a substrate, wherein the SnO2 hole sealing layer is prepared in an atomic layer deposition mode. According to the high-potential-corrosion-resistant composite coating provided by the invention, the SnO2 layer is deposited on the surface of the amorphous carbon coating, so that the effect of closing amorphous carbon defects is achieved, and the high-potential-corrosion-resistant composite coating has excellent corrosion-resistant protection performance under 1.6 V high-potential corrosion.

A negative electrode material, comprising composite particles. Each of the composite particles comprises a core and an amorphous carbon coating layer located on the surface of the core, wherein the core comprises a graphite framework and amorphous carbon in the graphite framework; and the amorphous carbon coating layer has a thickness of 10-50 nm. Raman spectral area scanning is performed on the negative electrode material, and there are 400 Raman spectral area scanning points; and the average ID / IG value of the Raman spectrum of the negative electrode material is 0.10-0.20, wherein the proportion of the number of scanning points having a single-point ID / IG value of less than 0.2 is greater than 60%. The negative electrode material has a high compaction density, a high capacity, a low expansion rate, good rate performance, and good high-temperature cycling performance.

This invention provides a high heat-resistant composite multilayer coating and its preparation method, specifically relating to the field of surface coating technology. The invention discloses a high heat-resistant composite multilayer coating comprising a Cr bonding layer, a Cr1-XAlXN / nc-CrAlN-a-CNX multilayer transition layer 3, and an nc-CrAlN-a-CNX functional layer sequentially coated on a cemented carbide substrate. The Cr1-XAlXN / nc-CrAlN-a-CNX multilayer transition layer and the nc-CrAlN-a-CNX functional layer proposed in this invention not only effectively bond Cr... 1‑X Al X N and CN X The enhanced properties and the composite multilayer structure endow it with excellent wear resistance, thereby achieving good lubrication and wear resistance in high-temperature environments. It significantly expands the high heat resistance of the amorphous carbon-nitrogen layer. At the same time, the transition of CrAl and C content in the composition and the construction method of multilayer support layer effectively improve the film-substrate bonding force between the substrate and the coating, enhance the toughness and load-bearing capacity of the top coating, alleviate the internal stress of the functional layer amorphous carbon layer, and significantly reduce the friction coefficient and wear rate of the amorphous carbon-based solid lubricating coating, thereby greatly improving the overall wear performance.

The present disclosure relates to a PET composite material and a preparation method therefor. The composite material comprises the following components in parts by mass: 50-100 parts of PET, 5-30 parts of an inorganic filler, and 5-30 parts of a PET copolyester. The PET copolyester is obtained by melting a waste pressure-sensitive adhesive product, adding an alcoholysis agent and a catalyst, and then performing polycondensation, wherein the waste pressure-sensitive adhesive product comprises a PET matrix and a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer comprises a copolyester elastomer, the copolyester elastomer is a copolymer of a carboxyl-terminated polyester and an amorphous carbon dioxide-based polyester diol, and the number-average molecular weight of the PET copolyester is 50,000 or below.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

The invention discloses a preparation method of a high-quality self-supporting polycrystalline diamond substrate. The preparation method comprises the following steps: obtaining a larger first substrate and a smaller second substrate; the molybdenum substrate is a polished molybdenum metal substrate; sowing diamond seed crystals on the first substrate by using an ultrasonic sowing method, and growing a nanocrystalline diamond epitaxial layer by using a CVD (Chemical Vapor Deposition) process; cutting the first substrate by using precise laser to obtain an annular polycrystalline diamond solid seed crystal of which the inner diameter is greater than that of the second substrate; placing a second substrate in the inner diameter of the second substrate, guiding generated tiny diamond grains to the second substrate through a boundary induction mechanism and applying direct current bias voltage, and uniformly wrapping the tiny diamond grains to form a self-supporting polycrystalline diamond substrate; according to the preparation method of the self-supporting polycrystalline diamond substrate, the orientation consistency and the crystallization quality of a diamond film are remarkably improved, and the prepared self-supporting polycrystalline diamond substrate has the advantages of being low in surface roughness, compact in structure, simplified in follow-up process and the like.

A method for manufacturing composite cathode particles based on a dual-coated ternary oxide for an electrochemical battery by a high speed rotation includes the steps of: placing a plurality of large NCM (lithium nickel manganese cobalt oxide) particles and a glass phase material into a first mixer for stirring by a first high speed rotation to form a plurality of glass-phase-layer-contained NCM particles; then mixing a plurality of small LLZO particles and the glass-phase-layer-contained NCM particles by a second high speed rotation of a second mixer to form a plurality of composite NCM particles; and then mixing the composite NCM particles, a plurality of first carbon nanotubes and a plurality of nanoscale amorphous carbons to form a plurality of carbon-material-contained positive electrode particles.

The invention provides a battery, which comprises a negative plate and an electrolyte, the negative plate comprises a negative active material, the negative active material comprises a silicon-carbon composite material, the silicon-carbon composite material comprises a silicon-carbon core and a shell coated on the surface of the silicon-carbon core, the shell comprises an amorphous carbon layer and a graphene layer, and the amorphous carbon layer is coated on the surface of the silicon-carbon core. The amorphous carbon layer is located between the silicon carbon inner core and the graphene layer; in the Raman spectrum of the silicon-carbon composite material, the I2D / IG value k is more than or equal to 0.4 and less than or equal to 0.8; the electrolyte comprises acetic acid 2, 2-difluoroethyl ester, and the mass percentage m% of the acetic acid 2, 2-difluoroethyl ester in the electrolyte meets the condition that m% is larger than or equal to 5% and smaller than or equal to 65%, and k / m meets the condition that k / m is larger than or equal to 0.008 and smaller than or equal to 0.1. According to the battery, the amorphous carbon layer buffers expansion, and the graphene layer conducts electricity and obstructs; in the electrolyte, acetic acid 2, 2-difluoroethyl ester and graphene cooperate to construct a self-adaptive SEI film; parameter optimization is matched to enhance structural stability and ion transmission, and the performance is comprehensively improved.

The invention discloses a negative electrode coating material production method, a negative electrode coating material and a lithium ion battery, and relates to the technical field of lithium battery material preparation, and the negative electrode coating material production method comprises the following steps: carrying out functional modification on a covalent bond of a carbon nanotube to obtain a functional carbon nanotube grafted with a specific functional group; dispersing the composite material in an organic solvent, adding a coating precursor and a dispersion binder to form coating slurry, adding a silicon-based negative electrode matrix, and performing spray drying to obtain a pre-coated composite material; a three-dimensional gradient composite coating structure is formed sequentially through low-temperature dehydration crosslinking, medium-temperature pre-carbonization and catalysis and high-temperature graphitization and densification treatment, an amorphous carbon layer, a functionalized carbon nanotube reinforced composite layer and a highly-graphitized outer surface layer are arranged from inside to outside, the thickness of the material coating layer is 50-200 nm, the volume resistivity is smaller than or equal to 5 * 10 <-3 > omega.cm, the first coulombic efficiency at 0.1 C is larger than or equal to 85%, and the specific surface area of the material coating layer is larger than or equal to 10%. And the capacity retention ratio after 500 cycles is greater than or equal to 80%, so that the material is suitable for high-performance lithium ion battery negative electrodes.

The invention provides an amorphous carbon coated lithium manganese iron phosphate positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: mixing a lithium source, a ferrous source, a manganese source, a phosphorus source, a carbon source and a solvent to obtain mixed slurry; carrying out spray drying treatment on the mixed slurry, and carrying out plasma treatment on the obtained dried material to obtain a precursor material; and mixing the precursor material with a boron source, and sintering to obtain the amorphous carbon coated lithium iron manganese phosphate positive electrode material. The surface of the lithium manganese iron phosphate positive electrode material is coated with the amorphous carbon layer, the bonding strength of the amorphous carbon coating layer and the positive electrode material is high, the problem of electronic conductivity of the lithium manganese iron phosphate positive electrode material is solved, and meanwhile, the ionic conductivity of the material is improved through boron doping.

The application relates to the technical field of lithium ion battery materials, and discloses a low-expansion silicon-carbon material and a preparation method thereof. The low-expansion silicon-carbon material has a porous core-shell structure, the inner core is graphene / metal-doped amorphous carbon-coated nano silicon, and the shell is boron-doped amorphous carbon. The preparation method comprises the following steps: firstly, a silicon oxide compound, a graphene oxide solution and an organic metal polymer are added into an organic carbon source solution, spray drying is carried out, and an oxidized graphene-coated metal-doped silicon oxide precursor material is obtained through reaction; secondly, a mixed gas of a boron source gas and argon is introduced into the oxidized graphene-coated metal-doped silicon oxide precursor material, and a boron-doped silicon-carbon composite material is obtained through reaction; and thirdly, the boron-doped silicon-carbon composite material is soaked in a hydrofluoric acid solution, and the low-expansion silicon-carbon material is obtained after drying. Through the technical scheme, the problems of high expansion and poor rate performance of the silicon-carbon material in the related art are solved.

The invention discloses a high-power silicon-carbon composite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing nano-metal particles, depositing amorphous carbon on the surfaces of the nano-metal particles through a vapor deposition method, and then carrying out acid pickling and core removal to obtain porous carbon; the preparation method comprises the following steps: preparing a silicon-carbon composite material, introducing silane gas and metal gas through a silane cracking method, depositing nano silicon and metal in pores of the silicon-carbon composite material, forming amorphous carbon on the surface of the silicon-carbon composite material, adding the amorphous carbon into a lithium sulfonate solution, and carrying out spray drying to obtain the lithium sulfonate-coated metal-doped silicon-carbon composite material. According to the obtained material, the electronic conductivity of the material is improved by doping metal in the inner core, the expansion is reduced by high-capacity porous carbon, and meanwhile, the lithium sulfonate coated on the outer layer has excellent solvation ability, so that the lithium ion transmission rate of the material is improved, and the rate capability is improved.

The invention relates to a coated substrate, preferably coated tool for use in manufacturing processes, such as machining processes or forming processes, comprising a coated surface, said coated surface formed by a substrate surface made of a first material (1) and a coating system, preferably an arc-PVD-deposited coating system, applied on said substrate surface, said coating system comprising an amorphous carbon film (100), wherein the amorphous carbon film (100) is a tetrahedral hydrogen-free amorphous carbon film in which the share of the sp3 bond percentages of the C—C bonds exceeds that of the sp2 bond percentages. The invention further relates to a method.

The invention relates to the technical field of lubricating materials, and provides a super-lubricating amorphous carbon-based thin film as well as a preparation method and application thereof. The super-lubricating amorphous carbon-based thin film comprises a bonding transition layer, a carbide gradient layer and a composite hydrogen-containing amorphous carbon-based film layer which are sequentially arranged from bottom to top, the composite hydrogen-containing amorphous carbon-based film layer is a sulfide-doped hydrogen-containing amorphous carbon thin film, and sulfide is one or two of tungsten sulfide and molybdenum sulfide. The structure of the carbon-based thin film is regulated and controlled by doping a small amount of sulfide, compared with a traditional hydrogen-containing amorphous carbon-based thin film, the obtained super-lubricating amorphous carbon-based thin film shows more stable super-lubricating performance and more excellent wear resistance, a new solution is provided for surface protection of tribological parts, and the method is suitable for popularization and application. The method has important industrial application value.

The application provides a biomass-based hard carbon composite negative electrode material with high capacity and high initial efficiency, and a preparation method and application thereof. The biomass-based hard carbon composite negative electrode material has high capacity and high initial efficiency, and also has excellent cycle performance. AlCl3 and SnCl4 are added into molten pitch, and AlCl3 and SnCl4 react with water in the pitch to generate nano Al2O3 particles and nano SnO2 particles, thereby obtaining modified pitch. After the modified pitch is prepared into a solution, the modified pitch can be filled into pores of a hard carbon precursor and form a coating layer on a surface of the hard carbon precursor in the process of impregnation of the hard carbon precursor. In a high-temperature carbonization process, the hard carbon precursor is converted into hard carbon, nano SnO2 is reduced into nano Sn particles by carbon, and pitch is converted into amorphous carbon. The nano Sn particles, the amorphous carbon and the nano Al2O3 particles are uniformly distributed in pores and on a surface of the hard carbon, and synchronous modification of the inside and the surface of the hard carbon is realized.

The invention discloses a charge-discharge low-expansion spherical silicon-carbon composite negative electrode material and a preparation method thereof, and belongs to the field of energy storage materials. According to the charge-discharge low-expansion spherical silicon-carbon composite negative electrode material, spherical porous carbon serves as an inner core, the outer side of the inner core is sequentially coated with an amorphous carbon layer and a fast plasma layer, the thickness of the amorphous carbon layer is 10-20 nm, and the thickness of the fast plasma layer is 1-5 nm; silicon atoms with the mass of (0.1-0.932) V are deposited in the spherical porous carbon, the unit is g, and V is the numerical value of the pore volume of the spherical porous carbon; the average particle size of the spherical silicon-carbon composite negative electrode material is 5-10 [mu] m, the spherical silicon-carbon composite negative electrode material contains closed pores, the volume of the closed pores is (0.5-0.9) V, and the unit is ml / g. The spherical silicon-carbon composite negative electrode material is stable in structure and excellent in conductivity, can effectively buffer volume expansion of silicon, realizes charge-discharge low expansion, prolongs the cycle life, improves the initial coulombic efficiency, and is suitable for lithium ion batteries, sodium ion batteries and other energy storage fields.

The invention discloses a high-entropy ferric pyrophosphate sodium ion battery positive electrode material and a preparation method thereof, and belongs to the field of battery positive electrode materials. The chemical formula of the positive electrode material is Na4Fe3-aMa (PO4) 2P2O7 (0.05 < = a < = 0.5), M is a metal element and comprises at least five of cobalt, magnesium, zirconium, zinc, aluminum, molybdenum, copper, manganese, nickel, calcium and chromium, the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is spherical, and the surface of the high-entropy ferric sodium phosphate pyrophosphate battery positive electrode material is coated with an amorphous carbon layer. The preparation method adopts a sol-gel method and comprises the following steps: mixing an iron source, a doped metal source, sodium pyrophosphate, ammonium dihydrogen phosphate and citric acid monohydrate according to a stoichiometric ratio, stirring, gelatinizing and drying to obtain xerogel, and calcining through a two-stage hydrogen-argon mixed gas to obtain the iron-doped metal-doped sodium pyrophosphate / citric acid composite material. The crystal structure is optimized by means of the high-entropy synergistic effect, the electron conductivity and the Na < + > diffusion rate are improved, and the industrial adaptability of the spherical morphology and the structural stability of carbon coating are combined.

The invention belongs to the field of silicon-carbon negative electrode materials, and particularly relates to a preparation method of a silicon-carbon negative electrode material and a silicon-carbon negative electrode semi-solid-state battery. The preparation method of the silicon-carbon negative electrode material comprises the following steps: grinding and mixing nano silicon and asphalt, and carbonizing to obtain amorphous carbon layer coated silicon particles; performing chemical vapor deposition of a carbon layer on the amorphous carbon layer coated silicon particles, and etching by using a ferric chloride solution to form porous composite carbon layer coated silicon particles; and annealing the porous composite carbon layer coated silicon particles in a nitrogen-containing atmosphere to form the nitrogen-doped silicon carbon negative electrode material. The nitrogen-doped porous composite carbon layer silicon-carbon negative electrode material is prepared through the links of amorphous carbon coating of silicon particles, chemical vapor deposition of a carbon layer, etching of a porous structure, nitrogen doping and the like, volume expansion of silicon can be effectively inhibited, and the cycling stability is improved. In addition, the capacity of the silicon-carbon negative electrode can be improved to 1500-1800 mAh / g, and great benefits are also brought to improvement of the energy density of the battery.

A silicon-carbon composite material, a negative electrode sheet and a battery. The silicon-carbon composite material comprises a hierarchically porous carbon material, silicon nanoparticles dispersed in pore channels of the hierarchically porous carbon material, and an amorphous carbon layer that coats a surface of the hierarchically porous carbon material, wherein the porous structure of the hierarchically porous carbon material comprises micropores, mesopores and macropores, the pore volume is 0.4 cm3 / g to 1.5 cm3 / g, and the pore volume of the micropores accounts for 60% to 92% of the total pore volume. The silicon-carbon composite material can effectively inhibit the aggregation of the silicon nanoparticles and reduce the phenomenon of stress concentration; and when the silicon-carbon composite material is used as a negative electrode active material for the preparation of a battery, better first-cycle efficiency, a lower expansion rate and a higher cycling stability can be obtained.

The invention is suitable for the technical field of lithium ion battery materials, and discloses a silicon-carbon composite material and a preparation method thereof, a negative electrode plate, a lithium ion battery and application. The silicon-carbon composite material is of a core-shell structure and comprises an inner core and an outer shell, the inner core comprises porous carbon and a composite body deposited on the porous carbon, the composite body is composed of nanometer silicon, metal, a carbon nanotube and a heteroatom compound, and the shell comprises amorphous carbon; with the mass of the silicon-carbon composite material as the reference, the mass ratio of the shell is 1-5 wt%. According to the silicon-carbon composite material provided by the invention, the electronic and ionic conductivity is improved, the rate capability is improved, the expansion is reduced, and the cycle performance is improved.

Provided herein are examples of methods and related apparatus for depositing an ashable hardmask (AHM) on a substrate using a process gas including hydrocarbons and halide-containing species and pulsed low frequency (LF) power. Halide-containing species may decrease the hydrogen content of the AHM, and a plasma using pulsed LF power may improve mechanical properties of the AHM. Also provided herein are examples of annealed hardmasks and examples of processes for annealing hardmasks.

The invention provides a high-capacity silicon-carbon composite negative electrode material and a preparation method thereof, and relates to the technical field of battery materials, the high-capacity silicon-carbon composite negative electrode material comprises the following components by mass: 20-50 parts of silicon-based particles, 3-8 parts of an interface modification layer, and 45-75 parts of a carbon matrix; the silicon-based particles are nano silicon; the interface modification layer is oxide or nitride and coats the surfaces of the silicon-based particles; the carbon substrate is prepared from 20 to 40 parts of graphite, 15 to 25 parts of amorphous carbon and 5 to 10 parts of carbon nanotubes; through the three-layer structure of the silicon-based particles, the interface modification layer and the carbon substrate, the cooperation of high capacity and high stability is realized, and the nano silicon-based particles give full play to the advantage of high capacity, so that the first discharge specific capacity of the material is higher; the interface modification layer reduces interface impedance of silicon and carbon and inhibits side reaction of silicon and electrolyte; the three-dimensional network of the carbon matrix not only reduces the electrode impedance, but also provides buffering for silicon volume expansion, and is obviously superior to the traditional graphite and the existing silicon-carbon negative electrode.