151 results about "Silicon anode" patented technology

The invention discloses a method for preparing a silicon-carbon composite negative electrode material through an electrostatic self-assembly technology, and belongs to the technical field of lithium ion battery negative electrode materials. According to the invention, lignin is used as a biomass carbon source and lauryl sodium sulfate (SDS) and poly (diallyldimethylammonium chloride) (PDDA) are used as activators through a simple electrostatic self-assembly technology; a proper amount of nano silicon and PDDA are subjected to in-situ adsorption, and lignin and SDS are subjected to in-situ adsorption; a self-assembly process is carried out through the positive and negative charge attraction effect among colloidal particles, so that effective compounding of the nano silicon particles and the biomass carbon is realized; and performing vacuum drying, and performing one-stage sintering in a tubular furnace to obtain the silicon-carbon composite negative electrode material. Based on the problems of non-uniform particle size, easy agglomeration and great abrasion of a silicon-carbon composite material in a traditional mechanical synthesis technology, the invention improves the compounding efficiency of the silicon-carbon material and improves the problems of volume expansion of a silicon negative electrode, slow migration rate of lithium ions, poor cycle performance and the like.

The invention belongs to the technical field of preparation of lithium battery negative electrode materials, and particularly relates to an artificial elastic interface layer modified silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a fluorinated acrylate monomer and a silane coupling agent, uniformly stirring, and adding a photoinitiator to obtain a mixed solution; adding a lithium salt and an organic solvent into the mixed solution to obtain a precursor solution; and preparing an artificial elastic interface layer on the surface of a silicon negative electrode by adopting the precursor solution, and curing to obtain the artificial elastic interface layer modified silicon negative electrode material. The volume expansion of the silicon-based negative electrode in circulation is relieved by the toughness of the fluorinated acrylate monomer, and the structural stability of the electrode is maintained; an organic solvent is introduced as a film-forming additive, solid electrolyte interface (SEI) components are optimized, the cycle life is prolonged, and the coulombic efficiency is improved; the silane coupling agent enhances electrolyte infiltration by regulating and controlling the lipophilicity of the pole piece, and enhances interface adhesive force by means of chemical bonding or physical adsorption, so that an interface layer is tightly connected with the surface of the silicon negative electrode.

The invention provides a low-trigger and high-maintenance silicon controlled rectifier and a manufacturing method thereof. A first N + injection region and a first P + injection region are arranged in a first N well, a third N + injection region and a second P + injection region are arranged in a first P well, and the second N + injection region is arranged between the first N well and the first P well; three electrodes corresponding to the first N + injection region, the first P + injection region and the second N + injection region are connected together to form a silicon controlled rectifier anode, and two electrodes corresponding to the third N + injection region and the second P + injection region are connected together to form a silicon controlled rectifier cathode; the first grid electrode is arranged on the surface of the first P well and connected with the cathode of the silicon controlled rectifier through an external resistor. And the external resistor, the second N + injection region and the side capacitor of the grid form an RC path, so that the effects of reducing the trigger voltage and improving the maintaining voltage are achieved.

The invention discloses a low-cost high-first-effect micron silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: treating the surface of micron silicon by adopting an oxidant solution to form a silicon dioxide passivation layer, and then carrying out surface modification by using a silane coupling agent; the method comprises the following steps: performing acid-base alternate soaking treatment on a biomass carbon source to reduce the content of metal impurities; mixing the delimed biomass carbon source, the composite carbon source and the pretreated micron silicon, firstly adding a weak acid catalyst for hydrothermal reaction to form a hard carbon inner layer, then adding a weak base catalyst for regulating the pH value of the system to alkalescence in batches, and continuing hydrothermal reaction to form a soft carbon outer layer; and washing and drying the product, and carrying out carbonization treatment in an inert atmosphere to obtain the composite coated micron silicon material. The first efficiency of the material is greater than or equal to 92%, the 1C 1000-time circulation capacity retention ratio is greater than or equal to 82%, the raw material cost is low, the process is simple, and the material is suitable for lithium ion batteries in the fields of power, energy storage and consumer electronics.

The invention belongs to the technical field of lithium ion battery materials, and discloses a composite modified negative electrode material and a preparation method and application thereof, the composite modified negative electrode material comprises a Mn2Si (P2O7) 2 nanometer material, nanometer silicon and layered graphite, and the Mn2Si (P2O7) 2 nanometer material, the nanometer silicon and the layered graphite material are uniformly distributed. The composite modified negative electrode material has good structural stability, and silicon element and nano silicon in pyrophosphate silicate in the negative electrode material can form Si-Si covalent bonds, so that the adhesive force of a surface composite layer of the negative electrode material can be greatly improved, polymer of the nano silicon can be inhibited, the volume expansion of a silicon negative electrode can be relieved, and the cycle performance of the battery can be improved.

The invention provides a three-dimensional silicon negative electrode material and a preparation method and application thereof. The three-dimensional silicon negative electrode material comprises a porous silicon material, and the pore wall surface and the particle outer surface of the porous silicon material are coated with an oxide layer, a carbon coating layer and a solid electrolyte layer; and the outer surfaces of the particles of the porous silicon material are coated with conductive polymer layers. According to the three-dimensional silicon negative electrode material, the hole wall surfaces and the outer surfaces of the particles are coated with the oxide layers, the carbon layers and the solid electrolyte layers, so that the structural stability of the material is guaranteed, an electron transmission channel and an ion transmission channel are further constructed, and meanwhile, the outer surfaces of the particles are further coated with the conductive polymer layers; and the structural integrity of the three-dimensional silicon negative electrode material in the circulation process is ensured.

The invention provides a negative electrode active material and a preparation method and application thereof, the negative electrode active material comprises a modified carbon-coated silicon negative electrode material and a modified carbon nanotube, and the modified carbon-coated silicon negative electrode material comprises a carbon-coated silicon negative electrode material and heteroatoms; the carbon-coated silicon negative electrode material comprises a silicon material and a carbon layer coated on the outer surface of the silicon material, heteroatoms are arranged inside or / and on the surface of the carbon layer, and the heteroatoms comprise at least one of O, N and F elements; the modified carbon nanotube is wound on the surface of the modified carbon-coated silicon negative electrode material, the modified carbon nanotube comprises a carbon nanotube and a first oxygen-containing functional group, the first oxygen-containing functional group is arranged on the end surface or / and the defect position of the carbon nanotube, and the first oxygen-containing functional group is connected with the carbon layer through a hydrogen bond. According to the negative electrode active material, the heteroatoms and the first oxygen-containing functional group are introduced, so that the conductivity of the negative electrode active material can be improved, and the expansion of the silicon material in the charging and discharging process is inhibited.

The invention discloses a metal fluoride molten salt coated silicon-based negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery negative electrode materials. The lithium fluoride-containing coating layer is constructed on the surface of the silicon negative electrode material by using the low-melting-point composite metal fluoride molten salt at a relatively low temperature through a molten salt coating method, so that the first effect and the cycling stability of the silicon-based negative electrode material can be effectively improved, and the preparation method has a good application prospect.

The invention belongs to the technical field of lithium batteries, and particularly relates to a method for forming an SEI film on the surface of a silicon anode. The invention provides a technical scheme for forming SEI through pulse voltage driving customization, parameters such as pulse voltage amplitude, pulse voltage high and low potential duration time and pulse time are reasonably designed, an SEI film with a specific component proportion and a microstructure is induced to be formed on the surface of an electrode, the first coulombic efficiency of a silicon anode is remarkably improved, and the service life of the silicon anode is prolonged. The irreversible capacity loss is reduced, meanwhile, the interface stability is enhanced, and a brand new SEI regulation and control strategy is provided for the development of the high-energy-density lithium ion battery.

A battery charging and discharging management method. When the charging and discharging management method is implemented, an electronic device may set a lower-limit voltage of a battery to a voltage higher than a theoretical lower-limit voltage, and continuously increase the lower-limit voltage as a battery cycle passes, thereby reducing a charging / discharging volume change rate of a silicon anode as much as possible, and extending a battery life.

This invention provides a silicon anode sheet, its preparation method, and a solid-state battery. The silicon anode sheet of this invention comprises: a negative electrode current collector and a silicon anode slurry coated on the surface of the negative electrode current collector. The silicon anode slurry comprises a solid electrolyte, nano-silicon, mixed silicon carbon, a conductive agent, a binder, and a solvent. The mixed silicon carbon comprises a first silicon carbon and a second silicon carbon with different particle sizes. The particle size distribution D of the solid electrolyte is... 50 Particle size distribution D smaller than that of first silicon-carbon 50 And the particle size distribution D of the first silicon-carbon 50 Particle size distribution D smaller than that of second silicon-carbon 50 The silicon anode electrode provided by this invention, through the compounding of silicon-carbon particles of different sizes and solid electrolytes, provides more expansion space for nano-silicon, thereby effectively reducing the expansion rate of the silicon anode electrode.

This invention relates to the field of secondary battery technology, specifically to a silicon-carbon composite material, its preparation method, and a lithium-ion battery. The preparation method of the silicon-carbon composite material includes: reacting an organometallic framework ZIF-8 in a saturated metal salt solution and then evaporating and crystallizing it to obtain a metal salt-coated organometallic framework Salt@ZIF-8; pulverizing a silicon-copper alloy precursor and the Salt@ZIF-8 at a mass ratio of 1:0.05-0.7 to obtain a mixed powder; and subjecting the mixed powder to a pyrolysis reaction and acid leaching treatment to obtain the silicon-carbon composite material. The silicon-carbon composite material obtained by this invention exhibits excellent structural stability and electrochemical performance, effectively mitigating the volume expansion of the silicon anode and improving cycle performance and rate performance.

This invention belongs to the field of battery active materials technology, specifically disclosing a silicon-oxygen-carbon composite material, its preparation method, and a secondary battery. The silicon-oxygen-carbon composite material is prepared using silicon powder, a carbon source, and an oxygen-generating agent as raw materials via a one-pot, single-step synthesis method, comprising the following processes: heating to a first preset temperature, decomposing the oxygen-generating agent to produce oxygen, oxidizing the silicon on the surface of the silicon particles to form a silicon oxide coating layer, and obtaining Si@SiO. x Particles, 0.5≤x≤2; heated to the second preset temperature, in the Si@SiO x A carbon coating layer is formed on the surface of the particles to obtain the silicon-oxygen-carbon composite material. This invention achieves this by forming a tightly wrapped SiO2 layer on the surface of silicon particles. x The thin film of the silicon layer and the carbon layer effectively buffers the volume expansion of silicon particles during the charging and discharging process, improves the conductivity of the silicon anode, and effectively avoids the side reaction between silicon particles and electrolyte. As an anode material, it exhibits considerable lithium storage capacity and excellent electrochemical performance.

A salt-philic solvent-phobic (SP2) polymer coating on a lithium anode, sodium anode, or a silicon anode selectively transports salt over solvent and is configured to promote salt-derived SEI formation on the anode. The SP2 coating can include a polymer backbone, a first side chain comprising a first moiety having salt affinity, and a second side chain comprising a second moiety immiscible with polar aprotic solvents.

This application provides an electrolyte and a battery using the same. The electrolyte includes a lithium salt, an organic solvent, and a functional additive. The functional additive has the following structural formula: wherein, among R1, R2, R3, R4, and R5, at least one includes at least one of an oxygen-containing substituent, a cyano-containing substituent, an ester-containing substituent, and a nitrogen-containing heterocyclic substituent; R6, R7, R8, R9, and R... 10 R 11 R 12 R 13 The electrolyte contains at least one of oxygen-containing boron heterocyclic substituents and halogen substituents. This electrolyte facilitates the formation of a uniform and dense interfacial film on the positive and negative electrode surfaces, provides interfacial stability, reduces the degree of side reactions at the positive and negative electrode interfaces, and thus optimizes the overall performance of the battery, especially high-nickel ternary / silicon anode batteries.

An element to be used as an anode in a lithium-ion battery comprising a lithiated single crystal porous-silicon layer made on the surface of a p-doped single crystal Si of thickness 25-1000 mm and resistivity of less than 0.01-ohm cm. Successful lithiation is achieved either electrochemically or by direct alloying of lithium metal with the porous-Si with a wide range of porosities. The lithiated silicon anode allows a high cathode loading in a lithium-ion battery resulting in record current densities without the formation of lithium dendrites.

The application provides an anode sheet and a secondary battery using the same, the anode sheet comprising an anode active material layer, the anode active material layer comprising an anode active material and a binder, the anode active material comprising a silicon-based active substance, and the binder comprising polyacrylic acid and its derivatives and polyvinyl alcohol; the anode sheet is laser-perforated; when the mass content of the silicon-based active substance is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the power of the laser perforation; and when the power of the laser perforation is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the mass content of the silicon-based active substance. Compared with the prior art, the anode sheet provided by the application selects anode sheets containing different contents of the binder according to different laser perforation powers or different silicon contents of the silicon anode sheet, thereby avoiding excessive burning of the active substance at the non-perforated part of the silicon anode sheet, and improving the cycle performance and safety performance of the battery in the charging and discharging process.

Systems and methods for batteries comprising a cathode, an electrolyte, and an anode, wherein the anode is a Si-dominant anode that utilizes water-soluble maleic anhydride- and / or maleic acid-containing polymers / co-polymers, derivatives, and / or combinations (with or without additives) as binders.

This invention discloses a non-aqueous electrolyte for lithium batteries and a lithium-ion battery. The non-aqueous electrolyte for lithium batteries of this invention comprises an electrolyte salt, a non-aqueous solvent, and additives, wherein the non-aqueous solvent is a morpholine compound. The non-aqueous electrolyte for lithium batteries of this invention, using a morpholine compound as a solvent, has a wider electrochemical window, resulting in stronger stability to high-nickel cathode materials and excellent resistance to reduction, significantly improving the storage performance and cycle life of batteries using high-silicon anodes.

The embodiment of the invention provides a BUCK converter and electronic equipment, and relates to the technical field of BUCK converters. The BUCK converter is used for the electronic equipment. The electronic equipment comprises a silicon negative electrode battery and a load, and the silicon negative electrode battery is electrically connected with the load through a BUCK converter. The BUCK converter comprises a first switch tube, a second switch tube and an energy storage element. The first end of the first switch tube is electrically connected with the silicon cathode battery, the second end of the first switch tube is electrically connected with the first end of the energy storage element and the first end of the second switch tube, and the second end of the energy storage element is electrically connected with the second end of the second switch tube. The first switch tube and the second switch tube are used for controlling charging or discharging of the energy storage element. Wherein the first switch tube and the second switch tube are both N-channel metal-oxide semiconductor field effect transistors. Through the arrangement, the conduction impedance of the first switch tube and the second switch tube can be reduced, so that the loss of the BUCK converter is reduced, and particularly, the loss of the BUCK converter when the output voltage of the silicon cathode battery is relatively low is reduced.

The invention relates to the technical field of battery material performance testing, and discloses a silicon negative electrode particle voltage endurance capability characterization testing method which comprises the following steps: preparing silicon negative electrode slurry; coating a pole piece; rolling the pole piece; assembling and testing for the first time to obtain first capacity and first efficiency data; placing the pole piece in a specific humidity environment; assembling and testing for the second time to obtain retested capacity and first efficiency data; the voltage endurance capability is judged, if the difference value of the two lithium intercalation capacities is larger than 1% of the initial lithium intercalation capacity, it is judged that the silicon negative electrode particles do not tolerate the rolling pressure, and otherwise, the silicon negative electrode particles tolerate the rolling pressure; by simulating the actual stress condition in the battery manufacturing process, the characterization test result of the voltage endurance capability of the silicon negative electrode particles is closer to the actual application scene, and the accuracy and reliability of the test are improved; physical testing is carried out, and the stability of the silicon negative electrode particles in electrochemical reaction is evaluated through electrochemical testing, so that the voltage endurance capability of the silicon negative electrode particles is evaluated more comprehensively.

The invention provides a silicon-carbon composite material and a preparation method thereof, a silicon negative electrode and a lithium ion battery, and belongs to the technical field of secondary batteries. The silicon-carbon composite material comprises silicon-based particle-loaded porous carbon nanotubes and graphene, the silicon-based particle-loaded porous carbon nanotubes comprise silicon-based particles and porous carbon nanotubes, and through holes are formed in the tube walls of the porous carbon nanotubes. The silicon-based particles are dispersed in the porous carbon nanotubes and are loaded on the outer surface walls of the porous carbon nanotubes, and the porous carbon nanotubes loaded with the silicon-based particles are distributed on the graphene in a stacked manner. An efficient synergistic effect mechanism is formed among the silicon-based particles, the porous carbon nanotubes and the graphene in the silicon-carbon composite material, so that the silicon-carbon composite material has the excellent characteristics of high capacity, high magnification, low expansion and high cycle.

The present invention relates to a silicon anode material for a lithium-ion secondary battery, comprising a granular porous silicon composite formed by the agglomeration of silicon composites, wherein the silicon composite is a flake-shaped silicon composite in which a composite layer, which comprises an oxide layer and a carbon-containing layer, is formed on flake-shaped silicon obtained from waste silicon kerf. A silicon anode material for a lithium-ion secondary battery, comprising the porous silicon composite, and an anode and a lithium-ion secondary battery, which comprise same, can be provided. If composited with graphite, the silicon anode material exhibits excellent packing density, allows more lithium to be charged per unit volume, and uses waste silicon kerf so as to have superior economic feasibility.

The present invention relates to the field of silicon anode materials for lithium-ion batteries, and discloses a binder for silicon anode materials, a preparation method thereof, and an application thereof. First, a copolymer P(AA-MA-AN) is synthesized by free radical polymerization of acrylic acid, methyl acrylate, and acrylonitrile monomers. Subsequently, a self-healing binder P(AA-MA-AN)coPEI with a rich three-dimensional spatial structure is formed through reversible Coulomb crosslinking between P(AA-MA-AN) and branched polyethyleneimine. The binder for silicon anode materials of the present invention is used for silicon anode materials of lithium batteries, which can not only significantly improve the comprehensive performance and cycle stability of silicon anode materials, but also achieve environmentally friendly recycling and regeneration.

This invention relates to a breathable lithium-ion battery module structure, including fasteners, front and rear wall panels, a silicon anode lithium-ion battery, a pull rod, and a breathing plate. The silicon anode lithium-ion battery is fixed by the pull rod, fasteners, and front and rear wall panels. The breathing plate is placed between the silicon anode lithium-ion battery and the front wall panel. The breathing plate is a composite material structure, combining metal and polymer materials to achieve a structure with low elastic modulus and high elastic deformation capability. The breathing plate integrates a thermistor for monitoring temperature information at characteristic locations of the battery pack.

The present application concerns a method of manufacturing a lithium-ion cell (12), comprising the steps of: (i) providing a silicon anode (6); (ii) pre-lithiating the silicon anode (6) to form a pre-lithiated silicon anode (1) with a pre-lithiation level of from 1% to 100%; (iii) providing a providing: a separator (2); an electrolyte; and a lithium-ion cathode (3); (iv) forming a lithium-ion cell from the pre-lithiated silicon anode (1), the separator (2) and the lithium-ion cathode (3), wherein the silicon anode (6) comprises a lithium storage material, in which the lithium storage material comprises between 70 and 100 wt. %, preferably 85 and 100 wt. % silicon, with respect to the lithium storage material, and wherein the lithium storage material comprises silicon material with a columnar morphology.

This invention relates to the field of ceramic materials and provides a method for preparing silicon nitride powder, solving the problem of high residual chlorine / oxygen impurities due to the difficulty in removing byproducts during the preparation of silicon nitride in existing technologies. The method includes the following steps: S1, constructing an electrochemical cell: the anode material is a high-purity single-crystal silicon wafer; the cathode material is a graphite plate; the electrolyte is a mixed solvent of liquid ammonia and ethylenediamine with added LiCl electrolyte; S2, electrochemical ammonolysis reaction: under the action of an electric field, the silicon anode is oxidized to generate high-valence silicon-ammonia complex ions; the NH2 released from the liquid ammonia... ‑ The precursor migrates and combines towards the anode to generate a silane precursor containing Si-NH2 bonds; S3, the precursor is purified by washing with liquid ammonia, replacing with organic solvent and drying at low temperature; S4, the precursor is subjected to low-temperature pre-decomposition and high-temperature crystallization treatment under nitrogen protection to obtain high-purity α-Si3N4.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a silicon-carbon composite material embedded with FeS nanoclusters as well as a preparation method and application of the silicon-carbon composite material. The silicon-carbon composite material provided by the invention comprises nano silicon and a carbon layer coated on the surface of the nano silicon, the carbon layer is a nitrogen and sulfur co-doped carbon layer; and FeS nanoclusters are embedded in the carbon layer. Wherein the carbon layer serving as a soft buffer layer can effectively relieve stress caused by volume expansion of the silicon negative electrode, and nitrogen and sulfur heteroatom doping can further improve the conductivity of the carbon material, so that charge transmission in the electrode is optimized. FeS is introduced to catalyze the delithiation reaction of Li15Si4 with relatively inert electrochemistry, the transmission speed of Li ions in a delithiation potential interval is maximally increased by 128 times, and the residual Li15Si4 is obviously reduced after charging is finished, so that the lithium loss capacity of the material caused by no lithium removal of Li15Si4 is greatly reduced, and the cycle performance is optimized.

The present invention discloses a three-dimensional conductive network carboxymethyl cellulose composite binder and a preparation method thereof, belonging to the technical field of lithium-ion batteries. The three-dimensional conductive network carboxymethyl cellulose composite binder of the present invention is prepared by grafting acrylamide monomers and pyrene-based monomers onto carboxymethyl cellulose and then compounding with conductive materials. By grafting acrylamide monomers and pyrene-based monomer copolymer long chains onto the main chain of carboxymethyl cellulose, the pyrene groups in the double-site pyrene-based monomers can be attracted to the conjugated structure of the conductive material through π-π stacking. The long carbon chain capped with alkenyl improves the solubility of the pyrene-based monomers, and the double-site enables the formation of a chemically cross-linked network structure between the side chains. At the same time, the amide groups and the carboxyl groups on the carboxymethyl cellulose can be attracted to the silicon anode through hydrogen bonds, increasing the adhesion. Its three-dimensional conductive network structure improves the ability to cope with the volume expansion problem of silicon particles and significantly improves the cycle performance of the battery.