1005 results about "Lithium ion battery anode" patented technology

The invention belongs to the technical field of energy storage materials, and particularly relates to a high-entropy oxide Fe0. 2Co0. 2Ni0. 2Cu0. 2Zn0. 2O and an ultrafast synthesis method and application thereof. According to the preparation method, ferroferric oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide with equal molar ratio are adopted as direct synthesis raw materials, toxic gases such as chlorine and nitrogen dioxide generated in the synthesis process of a metal salt precursor are avoided, and the uniformly distributed single-phase high-entropy oxide is synthesized in an ultrafast manner within 10 seconds by using a Joule heating technology; the synthesized high-entropy oxide is used as a lithium ion battery negative electrode material, and shows more excellent electrochemical performance and cycling stability compared with other high-entropy oxides prepared from transition metals with different proportions; in the preparation process, extra additives are not needed, operation is easy, the synthesis speed is high, the yield is high, element distribution is uniform, and the method has the advantages of being low in cost, high in efficiency and free of pollution and has the industrialization prospect.

The invention relates to the technical field of lithium ion batteries, and provides a negative plate and a lithium ion battery. The negative plate comprises a negative current collector and a negative active material layer arranged on at least one side surface of the negative current collector; the negative electrode active material layer comprises a first negative electrode active material layer and a second negative electrode active material layer, and the second negative electrode active material layer is arranged between the negative electrode current collector and the first negative electrode active material layer; the first negative electrode active material layer comprises an amorphous carbon coated graphite material, and the second negative electrode active material layer comprises a graphite material; the Dv50 of the amorphous carbon coated graphite material is recorded as P1 [mu] m, the Dv50 of the graphite material is recorded as P2 [mu] m, and P1 and P2 satisfy: P1gt; p2. The negative plate adopts a double-layer coating design to form the negative plate of which the surface layer has quick charge and the bottom layer has high energy density, so that the negative plate has both high energy density and quick charge performance.

The invention relates to the field of batteries, in particular to a preparation method and system of a silicon-carbon material, and the preparation method comprises the following steps: pretreating porous carbon, conveying the pretreated porous carbon to a fluidized bed reactor, sequentially introducing a silicon source gas and a carrier gas for silicon deposition treatment, heating, introducing a carbon source gas, adjusting the flow of the carrier gas for carbon coating treatment, and discharging and cooling to obtain a finished product, meanwhile, reaction tail gas is recycled. The preparation system comprises a gas inlet unit, a fluidized bed reactor unit, a tail gas circulation unit, a feeding preheating unit and a discharging unit. The fluidized bed reactor comprises an outer shell, an up-down stirring device, a heat exchange assembly and an air distribution assembly, and efficient reaction and temperature control can be achieved. The silicon-carbon material prepared by the method has excellent electrochemical performance and is suitable for a lithium ion battery negative electrode material. The unique porous structure and the uniform carbon coating layer effectively improve the conductivity and the structural stability of the material, and meanwhile, the volume expansion effect of silicon in the charging and discharging process is reduced.

The invention provides an amorphous copper nanolayer coated spherical porous silicon composite material and a preparation method and application thereof.The preparation method includes the step that the surface of spherical porous silicon is coated with an amorphous copper conductive nanolayer through a simple solution method.On the basis of the principle of replacement reaction, aluminum in aluminum-silicon alloy is replaced with copper to be coated on the surface of silicon, and the amorphous copper nanolayer coated spherical porous silicon composite material is obtained. And meanwhile, the rate of the replacement reaction is slowed down by utilizing different reaction activities of copper chloride in an organic solvent, so that the spherical morphology is kept, and meanwhile, the surface of silicon can be coated with a layer of amorphous copper nano layer with high conductivity. The invention also provides a preparation method of the material. Tests find that the conductivity of the material can be effectively improved due to the excellent conductivity of the copper nano layer, and the volume expansion effect of the material in the electrochemical cycle process can be effectively relieved due to the porous structure. Therefore, the combination of the two effectively improves the problems of poor conductivity and unstable structure of the silicon negative electrode material, and effectively improves the application performance of the silicon negative electrode material in the lithium ion battery negative electrode.

The invention relates to a silicon-carbon composite material with a porous structure and a preparation method thereof, and the silicon-carbon composite material with the porous structure comprises an N / P co-doped porous carbon skeleton with micropore, mesopore and macropore channel networks, and amorphous or low-crystalline nanometer silicon particles which are uniformly loaded in the porous carbon skeleton and have the average particle size of 15-40nm, the mass percent of silicon in the composite material is 40-60%, and good interface bonding is formed between silicon and carbon. The preparation method mainly comprises the following steps: firstly, preparing an N / P co-doped porous carbon skeleton through a template method in combination with high-temperature carbonization and N / P source co-pyrolysis; and hydrolyzing an organic silicon source in the carbon skeleton to form silicon dioxide, and performing low-temperature metal thermal in-situ reduction to obtain the nano-silicon loaded composite material. Through a unique porous carbon skeleton design and a precise in-situ composite strategy of nano silicon, the prepared material shows high specific capacity, high initial coulombic efficiency and excellent cycling stability and rate capability when being used as a negative electrode of a lithium ion battery.

The invention discloses a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery negative electrode materials. The material sequentially comprises a porous silicon core, a transition layer and a shell from inside to outside, the transition layer is a nitrogen-doped SiC / C composite layer, the shell comprises a graphene / carbon nanotube skeleton and MXene quantum dots, the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton, boric acid ester bonds exist between carbon nanotubes and graphene, and the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton. The silicon-carbon negative electrode material is based on dual-network dynamic bonding and stress gradient regulation and control, the cycle performance of the material can be remarkably improved, and the service life of the material can be remarkably prolonged.

The invention relates to the technical field of lithium ion battery negative electrode materials, and discloses a preparation method and application of a high-efficiency silicon-carbon composite graphite material, and the preparation method comprises the following steps: S1, carrying out porosity and size regulation and control on silicon particles: carrying out ball milling on industrial-grade silicon powder to obtain nano silicon particles, and carrying out acid etching to form a porous structure; s2, functional surface treatment and interface optimization: introducing functional molecules to the surfaces of the silicon particles and coating a layer of ultrathin SiO2 protective film; and S3, carbon coating and flexible protection layer construction: performing pyrolysis on the porous silicon particles by using a carbon source to form a uniform carbon coating layer which is applied to a lithium ion battery negative electrode material, and the lithium ion battery is used for an electric vehicle, a power grid energy storage system and portable electronic equipment. Through the collaborative design of the flexible protection layer, the double-layer carbon coating and the gradient coating, the technical bottlenecks of the silicon-based negative electrode material in the aspects of long cycle stability, high rate performance and interface chemical stability are systematically solved.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a spinel type metal oxide coated hard carbon composite material based on a lattice matching mechanism, and a gradient doping preparation method of the spinel type metal oxide coated hard carbon composite material can overcome the defects that a hard carbon material is low in initial coulombic efficiency (about 50%), low in lithium ion transmission rate and poor in rate capability. According to the invention, magnesium salt, aluminum salt, copper salt and other metal salts are mixed with hard carbon, a precipitant is added, and a hydrothermal method is combined with a calcination process to obtain the core-shell structure composite material with hard carbon coated with a spinel structure. The technology has the following three obvious advantages: (1) lattice adaptive design of the spar type metal oxide and the hard carbon, (2) molybdenum-copper gradient doping repair of the SEI film, and (3) stable circulation of more than 5000 times at the capacity of 350mAh / g.

The invention provides a negative electrode plate and a lithium ion battery, the negative electrode plate comprises a negative electrode current collector, a first negative electrode active layer and a second negative electrode active layer, the negative electrode current collector comprises a first region and a second region, the first region is arranged on the negative electrode current collector, the second region is located between the edge of the negative electrode current collector and the edge of the first region, the first negative electrode active layer is arranged in the first region, and the second negative electrode active layer is arranged in the second region; the Young's modulus of the second negative electrode active layer is greater than the Young's modulus of the first negative electrode active layer. According to the negative electrode plate provided by the invention, the second negative electrode active layer is arranged in the second region of the negative electrode current collector, the Young modulus of the second negative electrode active layer is greater than that of the first negative electrode active layer, and the relatively large Young modulus can inhibit volume expansion generated by the edge of the negative electrode plate in the charging and discharging process, so that the extension stress in the width direction of the negative electrode plate is reduced; the condition of corner damage caused by excessive extension of the negative plate is improved, so that the safety performance of the lithium ion battery is improved.

The invention discloses a preparation method and application of a carbon-interspersed superfine silicon network composite structure. According to the method, a carbon skeleton with a low specific surface area is used as a carrier, after high-temperature air oxidation pretreatment, nano silicon particles are loaded through vapor deposition or a mixing method, and the battery is assembled for in-situ electrochemical induction. In the induction process, silicon particles are subjected to lithiation fusion-lithium removal bonding to form a continuous network, a carbon phase is interspersed in the continuous network to limit silicon agglomeration, and a double-phase interspersed structure with a silicon network skeleton size of 5-40nm is obtained. According to the embodiment of the invention, as a lithium ion battery negative electrode, the specific capacity reaches 1507mAhg <-1 > under 0.2 Ag <-1 >, the 100-time cycle capacity retention ratio reaches 94.8%, and the 50-time cycle capacity retention ratio of a whole battery matched with LiFePO4 is 98.1%. A high-cost porous carbon carrier is abandoned, the problems of nano silicon agglomeration and side reaction are solved, and the method is compatible with industrial production.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material and a preparation method and application thereof. The preparation method of the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material adopts a one-step in-situ synthesis method, and specifically comprises the following steps: adding hexaacetylene benzene and lithium trifluoromethanesulfonate into a solvent, mixing, adding a catalyst, carrying out a heating reaction, and carrying out post-treatment on the obtained reactant to obtain the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material. Finally, the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material is obtained. The preparation method of the lithium trifluoromethanesulfonate in-situ doped graphdiyne composite material provided by the invention is simple in process, the prepared composite material is good in interface stability, and when the composite material is applied to a negative electrode of a lithium ion battery, the electrochemical performance of the battery can be improved, and the service life of the battery can be prolonged.

The invention relates to the technical field of preparation of a lithium ion battery negative electrode material, in particular to a metal organic framework coating for improving the performance of an iron oxide negative electrode lithium ion battery and a preparation method of the metal organic framework coating. The metal organic framework coating mainly comprises the step of coating the iron oxide by growing a metal organic framework on the surface of the iron oxide in situ. According to the invention, in-situ synthesis of a metal organic framework material on the surface of iron oxide is innovatively proposed, and the iron oxide material is coated in a hollow structure through a structure provided by an organic framework, so that volume expansion and shrinkage of iron oxide in charge and discharge processes are effectively buffered. By regulating and controlling the mass ratio of the organic framework to the ferric oxide, the high-rate discharge performance and the specific discharge capacity of the ferric oxide negative electrode are improved.

The invention provides a copper-nickel alloy foil and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode current collectors, and the preparation method comprises the following steps: preparing a copper-nickel composite electrolyte, and adding a coordination agent, a pH buffer agent and an additive into the copper-nickel composite electrolyte to obtain a mixed electrolyte; the coordination agent comprises a main coordination agent and an auxiliary coordination agent, and the main coordination agent comprises at least one of trisodium citrate, potassium sodium tartrate and sodium pyrophosphate; the auxiliary coordination agent comprises at least one of ammonia water, glycine and triethanolamine; and a cathode and an anode are placed in the mixed electrolyte, the pH of the mixed electrolyte is controlled to be 6-10, direct current is applied for electrochemical deposition, and the copper-nickel alloy foil is obtained. According to the method, the alkalescence system is adopted, the main coordination agent and the auxiliary coordination agent are used, full coordination of free Cu < 2 + > and Ni < 2 + > is achieved, precipitation is avoided, the hydrogen evolution phenomenon is greatly reduced, and the alloy foil quality is improved.

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 discloses a lithium ion battery negative electrode material for a start-stop power supply and a preparation method of the lithium ion battery negative electrode material, and belongs to the field of battery materials. The lithium ion battery negative electrode material for the start-stop power supply is formed by compounding artificial graphite secondary particles and hard carbon, the compounding mass ratio of the artificial graphite secondary particles to the hard carbon is (1-10): (10-1); the problems that an existing material is low in rate capability and high in cost are solved.

The invention discloses a high-performance composite silicon-carbon negative electrode material and a preparation method thereof, and belongs to the technical field of lithium ion battery negative electrode materials. The composite silicon-carbon negative electrode material with excellent electrochemical performance is synthesized through structural design. The preparation method comprises the following steps: firstly, treating a raw material micron silicon to prepare porous silicon; then compounding the porous silicon with graphite and porous carbon; finally, the composite material is subjected to segmented coating, hard carbon coating is conducted on the first segment, and CVD gas phase coating is conducted on the second segment; the finally obtained composite silicon-carbon negative electrode material improves the first coulombic efficiency and the cycle performance on the basis of obviously improving the specific capacity of the negative electrode of the lithium ion battery.

The invention discloses an artificial SEI film coated graphite 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: heating and oxidizing graphite in mixed gas of air and nitrogen, and cooling to obtain oxidized and etched graphite; then dispersing the oxidized and etched graphite in a solvent, adding methyl methacrylate and graphene, stirring and initiating an in-situ polymerization reaction, and forming a doped coating layer on the oxidized and etched graphite; and finally, carrying out vacuum drying on the coated oxidized and etched graphite, and cooling to obtain the artificial SEI film coated graphite negative electrode material. The specific surface area of graphite is increased through oxidation etching, the ion diffusivity is improved, the combination effect of the organic polymer is improved, the first efficiency of the negative electrode material is remarkably improved by combining the synergistic effect of the conductive polymerized organic matter and graphene, and the conductivity, the structural stability and the interface compatibility are enhanced.

Silicon-carbon composites obtainable by a process comprising the following steps: Step 1: Provision of one or more porous carbon particles, wherein the porous carbon particles (i) covalent organic framework compounds (COFs) are, (ii) a mean electrical particle resistance of at least 0.5 MΩ, (iii) a reversible delthiation capacity β of not more than 100 mAh / g and (iv) exhibit a mass loss of no more than 10 wt.% up to 380°C, Step 2: Thermal deposition of silicon from one or more gaseous silicon precursor(s) in the pores and / or on the surface of the porous carbon particles and, if applicable, Step 3: Deposition of additional carbon in the pores and / or on the outer surface of the silicon-carbon composites if the silicon-carbon composites after Step 2 have a specific surface area above 50 m²2 / g, wherein the silicon-carbon composites after step 2 and, if applicable, step 3 a) a specific surface area of ​​at most 50 m² 2 / g and b) have an average electrical particle resistance of at least 0.5 MΩ. Furthermore, a method for producing the silicon-carbon composites according to the invention, their use as active materials in anodes for lithium-ion batteries, anodes containing these silicon-carbon composites, and lithium-ion batteries comprising anodes containing these silicon-carbon composites are the subject of the present invention.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a method for preparing porous carbon through secondary utilization of porous carbon airflow fine powder, which comprises the following steps: (S1) mixing the porous carbon airflow fine powder and a binder according to a mass ratio of 100: (15-30), and then carrying out curing reaction to obtain a precursor; the binder comprises thermosetting phenolic resin, an epoxy silane coupling agent and fumed silica; (S2) after crushing and screening the precursor, performing pyrolysis carbonization in an inert atmosphere to obtain pyrolytic carbon; and (S3) activating the pyrolytic carbon under an activation atmosphere condition to obtain the porous carbon material. According to the method, the specific adhesive is utilized, the airflow fine powder which is difficult to recycle is well reutilized, additional equipment does not need to be added, the airflow fine powder does not need to be subjected to complicated particle size screening, and secondary utilization of the airflow fine powder can be completed through existing equipment.

The invention discloses a method for preparing a graded porous structure Si-C composite material based on a double-template method, and belongs to the technical field of lithium ion battery negative electrode materials. The method specifically comprises the following steps: (1) silicon waste pretreatment; (2) preparing a double-template / carbon source precursor mixture; (3) sealing, transferring and charging; (4) carrying out in-situ reduction, carbonization and pore forming; (5) template removal and post-treatment; (6) solvent replacement; and (7) drying. The invention relates to a method for preparing a carbon-coated silicon-based composite material (Si-C) with a hierarchical porous structure by using silicon waste (SSW) generated by diamond wire cutting in the photovoltaic industry as a raw material through an innovative synergistic double-template method. When the material prepared by the method is used for a lithium ion battery negative electrode, the key problems of serious volume expansion and short cycle life of a silicon-based material can be solved, and meanwhile, high-added-value resource utilization of solid waste is realized.

The invention belongs to the technical field of high-entropy metal oxide nano powder materials, and particularly relates to a novel high-entropy metal oxide material for a negative electrode of a lithium ion battery and a preparation method of the novel high-entropy metal oxide material. On the basis of a solution combustion synthesis technology, a redox reaction system is constructed by adopting metal nitrate and organic fuel (such as citric acid, urea and the like), three spinel type high-entropy metal oxide nano powder materials with good electrochemical performance are provided and comprise (FexCoyNizCrmLin) 3O4, (FexCoyNizCrmLinZnq) 3O4 and (FexCoyNizCrmLinMgq) 3O4, the ratio of x: y: z: m: n: q is (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1), and the reversible specific capacity can reach 442.2-1190.3 mAhg <-1 > after 400 cycles under the current density of 500 And the rapid synthesis process significantly shortens the time required by traditional sintering, the obtained powder product also has the characteristics of narrow particle size distribution, high grain boundary purity, excellent chemical uniformity and the like, and an effective preparation way is provided for developing a high-performance electrode material.

The invention discloses a modified acrylate emulsion adhesive as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The modified acrylate emulsion adhesive is prepared by adopting a semi-continuous emulsion polymerization method. The water-based adhesive is prepared from the following raw materials in parts by weight: 5-20 parts of water-based polyolefin, 50-200 parts of deionized water, 0.5-4 parts of an emulsifier, 20-50 parts of an acrylate monomer, 1-10 parts of an acrylic monomer, 0.2-1.5 parts of an initiator, 0-50 parts of styrene, 0.1-2 parts of a cross-linking agent and 0.5-15 parts of a neutralizer. The modified acrylate emulsion adhesive is obtained by taking the water-based polyolefin as a core structure of the emulsion and taking the acrylate polymer as a shell structure of the emulsion, and the adhesive has good compatibility with a polyolefin diaphragm and an electrolyte, so that the synergism of a lithium ion battery negative electrode, the electrolyte and the diaphragm is promoted; further, the electrochemical performance of the lithium ion battery is improved.

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 present invention belongs to the field of lithium ion batteries, and specifically relates to an in-situ preparation method and a recovery method for a solid polymer electrolyte, as well as a lithium ion battery. The preparation method provided by the present invention comprises the following steps: a) loading an electrolyte precursor onto a surface of a battery separator, and then assembling same with a lithium ion battery positive electrode and a lithium ion battery negative electrode, to obtain a semi-finished lithium ion battery product, components of the electrolyte precursor in step a) comprising a polymer monomer, a lithium salt and an initiator, the lithium salt being lithium perchlorate, lithium hexafluorophosphate, lithium difluorophosphate, or the like; b) under heating conditions, performing in-situ polymerization of the electrolyte precursor on the battery separator in the semi-finished lithium ion battery product, to obtain a solid polymer electrolyte loaded on the battery separator. The preparation method provided by the present invention does not require an additional catalyst, and the prepared solid polymer electrolyte can be depolymerized by means of heating, and has good environmental and economic benefits.

The invention relates to the technical field of battery recovery, and particularly discloses a recovery method of a waste lithium ion battery negative electrode material and a lithium ion secondary battery. The recycling method comprises the following steps: discharging, disassembling and separating the waste lithium ion battery to obtain a waste shell, a waste positive electrode material, a waste negative electrode material and a waste diaphragm material; crushing and screening the waste negative electrode material to obtain waste negative electrode powder; the method comprises the following steps: mixing waste negative electrode powder with ammonium bifluoride, and roasting for a preset time at 100-500 DEG C in an inert gas atmosphere; carrying out water leaching treatment on the roasted product, and carrying out solid-liquid separation on the obtained slurry to obtain a first leaching solution and a regenerated negative electrode material; mixing the first leaching solution with a reducing agent, reacting, and carrying out solid-liquid separation to obtain a second leaching solution and copper slag; mixing the second leaching solution with alkali, reacting, and carrying out solid-liquid separation to obtain a third leaching solution and positive electrode precursor slag; and concentrating the third leachate to obtain recovered ammonium bifluoride. By implementing the method, green closed-loop recovery of all parts of materials can be realized, and the energy consumption is low.

The invention discloses a carbon-coated surface modification method of granulated graphite powder, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing crystalline flake graphite and a hard carbon binder, granulating to obtain particles with d50 of 15-25 microns, adding a soft carbon coating agent, carbonizing, and screening to finally obtain the granulated graphite material. According to the method, two key links of granulation and carbon coating are comprehensively considered, the synergistic effect of a hard carbon binder and a soft carbon coating agent and the influence of different carbonization treatment modes such as gradient carbonization and co-carbonization on the performance of the granulated graphite powder are systematically studied, various parameters in the granulation and carbon coating processes are accurately regulated and controlled, and the performance of the granulated graphite powder is improved. Comprehensive optimization of granularity, structural stability, electrochemical performance and the like of the granulated graphite powder is realized, a brand new technical thought and method are expected to be provided for research, development and production of a lithium ion battery negative electrode material, and further development of a lithium ion battery technology is promoted; and the method has extremely important strategic significance and wide application prospect for promoting the progress of the new energy industry and optimizing the energy structure.

The invention belongs to the technical field of lithium ion battery negative electrode materials and coated asphalt, and discloses a preparation method and application of a coating material easy to graphitize. The preparation method comprises the following steps: by taking one or more than two of petroleum residual oil, ethylene tar, medium and low temperature coal tar, coal pitch, petroleum pitch and maltha as raw materials, adding a blending solvent and a catalyst to obtain a blending raw material; the easily-graphitized coating material with relatively low interlayer spacing after carbonization is obtained by sequentially carrying out blending solvent compounding, boron doping and pressurized polymerization or sequentially carrying out blending solvent compounding, boron doping, pressurized polymerization, oxidation crosslinking and reduced pressure distillation / molecular distillation processes. The graphitization performance of the asphalt material is remarkably improved through boron doping, so that the asphalt material can form an ordered carbon layer structure at 1200 DEG C, carbonization shrinkage and microcrack generation are inhibited, and the compactness and uniformity of a coating layer are improved. The obtained coating material is suitable for the negative electrode of the lithium ion battery, and the first charge reversible capacity, the cycle stability and the rate capability of the battery can be improved.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a silicon-carbon negative electrode material based on spherical-like resin porous carbon and a preparation method thereof.The method comprises the steps that resin and an emulsifier are fully reacted, solid resin microspheres are obtained after treatment, then high-temperature carbonization is conducted, potassium hydroxide activation is conducted after smashing, and the spherical-like resin porous carbon-based silicon-carbon negative electrode material is obtained; and carrying out acid washing to obtain the spheroidic porous carbon. And the silicon-carbon negative electrode material is obtained after vapor deposition, and the material is particularly suitable for a high-energy-density power battery.

The invention provides a preparation method and application of a bamboo powder biomass carbon negative electrode material, and relates to the field of electrochemistry and new energy materials. The preparation method of the bamboo powder biomass carbon negative electrode material comprises the following steps: S1, weighing bamboo powder, washing with deionized water and ethanol, and drying in a drying oven to obtain a carbon precursor; s2, activating the dried bamboo powder by using a KOH solution, stirring, filtering and drying to obtain a carbonized precursor; s3, putting the carbonized precursor obtained in the step S2 into a crucible, and treating the carbonized precursor under a high-temperature condition and in a protective atmosphere to obtain a porous carbonized product; and S4, carrying out acid pickling on the porous carbon material by using an acid solution, washing the product to be neutral by using deionized water, and drying to obtain the bamboo powder biomass carbon negative electrode material. The bamboo powder biomass carbon negative electrode material is used for preparing lithium ion battery negative electrode slurry. The method has the advantages that renewable and environment-friendly biomass is used as a carbon source, and the method is environment-friendly, simple in preparation process, suitable for large-scale production and the like.

The invention discloses a vapor deposition silicon carbon material and a preparation method and application thereof, and relates to the technical field of lithium ion battery negative electrode materials, and the preparation method comprises the following steps: dissolving phenolic resin in a solvent, then adding boric acid, heating and stirring until the solution is clear, pouring the obtained aqueous phase solution into an oil phase, adding an emulsion stabilizer, and uniformly stirring; a solution of a water-in-oil system is obtained; heating the obtained solution of the water-in-oil system, continuously stirring, adding a curing agent, continuously stirring, removing an oil phase on the surface, and drying to obtain a phenolic resin microsphere precursor; carrying out heat treatment in an oxidizing atmosphere, cooling, calcining in an inert atmosphere, cooling, washing and drying to obtain a carbonized precursor; and mixing and grinding the carbonized precursor and potassium hydroxide, calcining, cooling, washing, drying, and introducing silane gas for deposition to obtain the vapor deposition silicon-carbon material. The preparation process is simple, the cost is low, and the first efficiency of the prepared vapor deposition silicon carbon material is high.