92results about How to "Improve the first effect" patented technology

The invention provides a graphite negative electrode material and a preparation method thereof, a dry-method electrode, a battery and electric equipment, and belongs to the technical field of battery manufacturing. The graphite negative electrode material is of a core-shell structure, an inner core is graphite, a shell is a polymer coating layer, the polymer coating layer can conduct ions but cannot conduct electrons, and the graphite negative electrode material can effectively inhibit PTFE from generating side reaction with lithium ions on the surface of a negative electrode, so that the first discharge gram capacity, the first effect and the cycle performance of a corresponding battery are improved.

The invention discloses a high-conductivity bridged silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The high-conductivity bridged silicon-carbon composite material comprises a core-shell structure with an inner core and an outer shell, the inner core is porous carbon and a carbon nano tube growing on the surface of the porous carbon in situ, and a nano silicon layer is attached to pores and surfaces of the porous carbon and the carbon nano tube; and the shell is a carbon coating layer. According to the high-conductivity bridged silicon-carbon composite material provided by the invention, the carbon nanotubes are grown on the surface of the porous carbon in situ, and contact among particles is similar to bridging, so that a point-line conductive network is formed, the intrinsic conductivity of the composite material is improved, and the electron transfer rate is accelerated. Meanwhile, the carbon nanotubes have extremely high strength and hardness, the mechanical strength of the porous carbon substrate can be remarkably improved by introducing the carbon nanotubes into the porous carbon material, expansion of nano silicon in the charging and discharging process can be better restrained, and the performance of high capacity, high first efficiency, long circulation and high magnification is shown.

The invention relates to the technical field of batteries, in particular to a porous carbon material, a silicon-carbon composite material and application of the porous carbon material and the silicon-carbon composite material. According to the porous carbon material, the micropore rate phi, the pore volume Pv and the compressive strength Cs meet the relational expression that (Cs * phi) / Pv is larger than or equal to 550 and smaller than or equal to 1050, and the micropore rate phi gt; and the compressive strength Cs is 600 to 850 MPa. The porous carbon material provided by the invention has high microporosity, and the microporosity phi, the pore volume Pv and the compressive strength Cs of the porous carbon material meet the relation that (Cs.phi) / Pv is more than or equal to 550 and less than or equal to 1050, so that the particle size of silicon particles can be effectively reduced, the absolute expansion of silicon in a carbon matrix is reduced, and the first effect and the cycling stability of the silicon-carbon composite material are improved.

The invention discloses a lithium cobalt oxide positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. According to the lithium cobalt oxide positive electrode material provided by the invention, the O2-phase lithium cobalt oxide main body material is coated with the coating layer containing the boron compound, and the provided O2-phase lithium cobalt oxide positive electrode material after surface optimization has higher initial efficiency, capacity and cycle stability than conventional O3-phase lithium cobalt oxide. The coating method adopted by the invention can be realized only by low-temperature secondary sintering, the O2 phase structure of the bulk phase is maintained, the boron-containing compound selected for coating generates a stable interface on the surface, and on the premise of not influencing lithium ion diffusion, the side reaction of the interface is inhibited, the structure is stabilized, and the cycling stability of the material is improved.

The invention discloses a silicon-carbon negative electrode material preparation method, which comprises: (S1) uniformly mixing a water-soluble resin and a transition metal salt aqueous solution, and drying to obtain a resin-loaded metal salt composite material; (S2) carrying out carbonization treatment on the resin-loaded metal salt composite material, and then carrying out reduction treatment to obtain metal-loaded porous carbon; (S3) placing the metal-loaded porous carbon in a mixed atmosphere containing carbon dioxide and acetylene, performing in-situ growth of carbon nanotubes in the porous carbon, and performing acid pickling to obtain modified porous carbon; and (S4) by taking the modified porous carbon as a substrate, sequentially carrying out silicon deposition and carbon coating to obtain the silicon-carbon negative electrode material. According to the preparation method of the silicon-carbon negative electrode material disclosed by the invention, the porous carbon is synthesized in situ, and the carbon nanotubes grow in the porous carbon in situ, so that more buffer spaces are provided for volume expansion of nano silicon particles from the angle of substrate preparation, and the long cycle stability of the silicon-carbon negative electrode material is remarkably improved.

The invention belongs to the field of energy storage of new energy materials, and relates to an asphalt-based hard carbon negative electrode material with high initial efficiency, high magnification and high capacity and a preparation method thereof. The hard carbon negative electrode material has a long and complete carbon layer edge, the specific surface area is 2-8 m < 2 > / g, and / or the aperture of the hard carbon negative electrode material is 1-12 nm. The method comprises the following steps: pre-oxidizing asphalt, mixing the pre-oxidized asphalt with a fusion repair-decomposition etching dual-function additive, and carrying out two-step high-temperature carbonization treatment in an inert atmosphere: melting metal salt in the first step of high-temperature carbonization so as to catalytically connect an edge carbon layer and repair defects; in the second step of high-temperature carbonization, the metal salt is decomposed to generate gas, pores are formed in the material, and the temperature of the first step of high-temperature carbonization is controlled to only melt the metal salt but not decompose the metal salt. Through single-additive two-step reaction, the first coulombic efficiency, the rate capability and the capacity are improved at the same time.

The invention relates to a secondary battery and an electric device. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the negative pole piece comprises a negative active layer, the negative active layer comprises a negative active material and a binder, and the binder comprises polytetrafluoroethylene; the electrolyte comprises a solvent and an additive, the solvent comprises carbonic ester and carboxylic ester, and the additive comprises a silane additive. According to the secondary battery disclosed by the invention, the electrolyte is reduced on the surface of the negative pole piece early to form a stable interface protection film, so that the negative active material can be passivated well while the reduction lithium consumption of the negative binder is inhibited, and the first effect and the cycle life of the secondary battery are improved.

The invention provides a silicon-based negative electrode material, a preparation method of the silicon-based negative electrode material, a dry-method electrode, a battery and electric equipment, and belongs to the technical field of battery manufacturing. The silicon-based negative electrode material is of a core-shell structure, an inner core is a silicon-based material, a shell is a cross-linked polymer layer, the cross-linked polymer layer can conduct ions but cannot conduct electrons, the silicon-based negative electrode material can effectively inhibit PTFE from generating side reaction with lithium ions on the surface of a negative electrode, and meanwhile, the service life of the silicon-based negative electrode material is prolonged. And the problems of electrode pulverization, falling and the like caused by volume expansion of the silicon-based material in the charge-discharge process can be effectively solved, so that the corresponding battery has relatively excellent first discharge gram capacity, first efficiency and cycle performance.

The invention relates to the technical field of batteries, in particular to a silicon-carbon composite material and application thereof. The silicon-carbon composite material comprises a porous carbon material and nano silicon particles positioned in pores of the porous carbon material, in a dQ / dV curve of lithium intercalation for the first time of the silicon-carbon composite material, the ratio of the intensity value of a lithium intercalation peak at 0.30-0.45 V to the strongest peak value within 0-0.25 V is less than 0.05. The silicon-carbon composite material has the advantages of high compressive strength, high charge-discharge capacity and good cycle stability.

The invention discloses a resin-based hard carbon composite material and application thereof in button type half-cell preparation. The method comprises the following steps: melting phenol, and adding a formaldehyde solution to prepare a mixed solution A; dispersing the carbon nano tube powder and hexadecyl trimethyl ammonium bromide in pure water, and grinding to obtain carbon nano tube dispersed slurry B; and adding the carbon nanotube dispersion slurry B into the mixed solution A to obtain a mixed solution C, adjusting the pH value to prepare a phenolic resin precursor solution, carrying out cross-linking curing to prepare a phenolic resin cured precursor, carrying out mechanical grinding, and putting the phenolic resin cured precursor into a tubular furnace to finally prepare the resin-based hard carbon composite material. Conductive carbon is introduced to the condensation polymerization end of phenol and formaldehyde, a communicated conductive network is formed in the composite material by regulating and controlling the material composition, the electron transmission distance between particles is shortened, the intrinsic conductivity of original resin carbon is improved, and the composite material has the advantages of high capacity, high first efficiency, high magnification and low ash content; wide application prospects are realized in the field of lithium ion battery negative electrode materials.

The invention provides a sodium ion battery negative electrode hard carbon material and a preparation method and application thereof, and the preparation method comprises the following steps: carbonizing a co-pre-oxidation raw material in an oxygen-containing atmosphere, mixing the carbonized co-pre-oxidation raw material with starch to form a mixed raw material, carrying out first-stage heat treatment in air, and carrying out second-stage heat treatment in a protective atmosphere to obtain the sodium ion battery negative electrode hard carbon material. Wherein the co-pre-oxidation raw material is any one or a mixture of more of biomass and carbonized raw materials. According to the preparation method, the thermal stability of starch pre-carbonization is effectively improved, the effect of inhibiting expansion of starch is achieved, and the problems of low structural damage capacity and the like caused by expansion due to the characteristics of starch raw materials are solved.

The invention relates to a secondary battery and an electric device. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the negative pole piece comprises a negative active material layer and a solid electrolyte interface film formed on the surface of the negative active material layer, and the solid electrolyte interface film comprises lithium fluoride, fluorine-containing lithium phosphate and a substance containing a fluorocarbon bond; an X-ray photoelectron spectrometer is adopted for testing after the sputtering etching time is 10 minutes, based on the total substance amount of fluorine atoms in a solid electrolyte interfacial film, the molar content of fluorine atoms in lithium fluoride is a, the molar content of fluorine atoms in fluorine-containing lithium phosphate is b, the molar content of fluorine atoms in a substance containing fluorocarbon bonds is c, a + b is larger than or equal to 85% and smaller than or equal to 100%, and c is larger than or equal to 0 and smaller than or equal to 15%; in addition, the negative electrode active material layer further comprises a binder, and the binder comprises polytetrafluoroethylene. The secondary battery of the present application can improve the first efficiency and cycle life.

The invention discloses a modified porous silica negative electrode material of a lithium ion battery and a preparation method and application of the modified porous silica negative electrode material, the modified porous silica negative electrode material comprises an inner core layer and a shell layer coating the inner core layer, and the inner core layer is a pre-magnesium silica material, namely porous SiO; the shell layer comprises a carbon nano tube growing on the surface of the porous SiO in situ and a carbon nano tube-nitrogen-doped conductive coating and repairing carbon layer, and the carbon nano tube is embedded in a porous channel of the porous SiO. The modified porous silica negative electrode material is prepared by constructing porous defects on the surface of silicon monoxide, modifying in-situ catalytic growth of carbon nanotubes and doping, coating and repairing a structure; according to the method, the carbon nanotubes can be quickly and uniformly grown on the surface of the porous silica powder and in pore channels, so that firm connection between the inner core layer and the outer shell layer is formed; meanwhile, the electronic conductivity and the ionic conductivity of the material are improved through the point-line-point connection mode. The obtained modified porous silica negative electrode material for the lithium ion battery has relatively high first efficiency, excellent conductivity and cycle rate capability.

The invention provides a silicon-oxygen-carbon composite material as well as a preparation method and application thereof, the surface layer of a silicon-oxygen material of a bulk phase of the composite material is lithiated and reduced into silicon, meanwhile, a double-layer carbon structure ensures the conductivity of the material, a plasma carbon coating layer is formed on the surface of SiO by utilizing a PECVD (Plasma Enhanced Chemical Vapor Deposition) technology before pre-lithiation, and the conductivity of the material is improved. After pre-lithiation, a heteroatom porous carbon coating layer is constructed on the surface of the material, so that a surface conductive layer is kept in contact with the inside, and doping modification is realized while carbon coating is performed. According to the preparation method, the microstructure of the pre-lithiated SiO is optimized, the growth of silicon particles in the pre-lithiation process is reduced, a three-dimensional penetrating conductive network is formed by combining the external carbon layer and the internal carbon layer, a channel is provided for rapid transmission of lithium ions, the conductivity of the material is improved, and volume expansion is relieved. The preparation process is simple, the first efficiency of the material is high, the conductivity is good, and the cycle rate capability is good.

The invention discloses a niobium-titanium-silicon-carbon composite material, a preparation method and application thereof and a battery. The preparation method of the niobium-titanium-silicon-carbon composite material comprises the following steps: mixing porous niobium oxide, a silicon source and a solid electrolyte to obtain a silicon intermediate product; and granulating and screening the mixture of the silicon intermediate product, the nano-porous lithium titanate oxide and the carbon source to obtain the niobium-titanium-silicon-carbon composite material. The niobium-titanium-silicon-carbon composite material prepared by the invention shows excellent rate capability and cycle performance when being used as a battery negative electrode material, and the preparation method is simple.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material. The composite positive electrode material is composed of a positive electrode base material, a lithium supplementing material and a catalytic material. The preparation method comprises the following steps: (1) preparing a composite material of the positive electrode base material and the lithium supplementing material in situ; and (2) dispersing the catalytic material on the surface of the composite material of the positive electrode base material and the lithium supplementing material, and forming a stable interface layer between the catalytic material and the lithium supplementing material. According to the method disclosed by the invention, the lithium supplementing material has double functions of surface modification of a positive electrode base material and lithium supplementing of a negative electrode, and meanwhile, the first effect and the cycling stability of the battery are improved; a catalytic material is introduced to the surface of the lithium supplementing material, free O generated by the lithium supplementing material Li is fixed in situ, the bag expansion phenomenon of the battery is relieved, and the cycling stability and safety of the battery are further improved; the preparation process is simple, raw materials are cheap and easy to obtain, the production cost is low, and industrial production and popularization are easy.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The invention discloses a preparation method and application of a resin-based hard carbon composite material, the preparation method comprises the following steps: melting phenol, adding a formaldehyde solution, adding carbon nanotube powder, and adjusting the pH value to 8-10 by using triethylamine to prepare a phenolic resin precursor solution; carrying out cross-linking curing reaction on the phenolic resin precursor solution to obtain a phenolic resin cured precursor; and mechanically grinding the phenolic resin curing precursor, and putting the phenolic resin curing precursor into a tubular furnace to finally prepare the resin-based hard carbon composite material with the conductivity of more than 30S / cm. Conductive carbon is introduced to the condensation polymerization end of phenol and formaldehyde, a communicated conductive network is formed in the composite material by regulating and controlling the material composition, the electron transmission distance between particles is shortened, the intrinsic conductivity of original resin carbon is improved, and the composite material has the advantages of high capacity, high first efficiency, high magnification and low ash content; wide application prospects are realized in the field of lithium ion battery negative electrode materials.

The present application discloses a lithium-ion battery and an electronic device, and relates to the technical field of lithium-ion batteries. The lithium-ion battery comprises a negative electrode plate, and the negative electrode plate comprises a silicon-carbon material, wherein the silicon-carbon material contains a hydrogen element, and the mass percentage of the hydrogen element is a% based on the mass of the silicon-carbon material. The present application controls the content of the hydrogen element in the silicon-carbon material within a suitable range, thereby reducing the side reaction between the silicon-carbon material and the electrolyte, and improving the long-term cycle stability of the lithium-ion battery.

The application relates to the technical field of batteries, in particular to a hard carbon negative electrode material and a preparation method and application thereof. A preparation method of a negative electrode hard carbon material comprises the following steps: carrying out first heat treatment on a mixture of an organic metal catalyst and biomass activated carbon, introducing a gas-phase carbon source and carrying out second heat treatment to obtain first material, and carrying out carbonization treatment and acid pickling treatment on the first material. The method can improve the capacity and initial efficiency of the hard carbon negative electrode material through cooperation of various steps; the method is simple in process and easy to realize large-scale production.

This invention discloses a process for utilizing silica suboxide micropowder, its products, and applications. The process includes: (1) mixing silica suboxide micropowder, carbon nanotubes, a dispersant, and a solvent to obtain a raw material dispersion, stirring until uniform, then mechanically ball-milling the dispersion, and finally drying it to obtain a silica suboxide / carbon nanotube composite; (2) shaping the silica suboxide / carbon nanotube composite prepared in step (1) to obtain a silicon-based material / carbon nanotube agglomerate; and (3) carbon-coating the silicon-based material / carbon nanotube agglomerate prepared in step (2) to obtain a silicon-carbon composite material. The utilization process disclosed in this invention not only fully utilizes the micropowder resources, but also enables batteries assembled from silicon-carbon composite materials prepared using silica suboxide as raw materials to possess high initial efficiency, high reversible specific capacity, and excellent cycle stability, thus solving a series of problems existing in the direct use of silica suboxide micropowder in batteries.

The invention discloses a multi-stage pickling and impurity removal method for a coal-based hard carbon precursor for sodium storage, comprising the following steps: pickling and impurity removal of coal-based material powder according to a mixed acid secondary pickling and impurity removal method or a single acid tertiary pickling and impurity removal method to obtain pickled coal-based material powder; sintering the pickled coal-based material powder at 500-800°C for 0-4h in an inert atmosphere, then carbonizing at 800-1450°C for 0.5-18h, and cooling to room temperature to obtain a coal-based sodium ion battery hard carbon material. The sodium ion battery prepared from the coal-based sodium ion battery hard carbon material has a first-cycle charge specific capacity of 270-300mAh / g, a first-cycle discharge specific capacity of 300-320mAh / g, a first-cycle coulomb efficiency greater than 90%, and trace metal elements and magnetic substances in the coal-based sodium ion battery hard carbon material meet the national standard for sodium ion battery hard carbon.

The invention discloses a preparation method of porous silicon carbon, the porous silicon carbon, a composite pole piece and a secondary battery, in the preparation method of the porous silicon carbon, indexes of a carbonized product and an activated product meet the following relation: # imgabs0 #, D00, D100, D10, D50 and D90 are corresponding particle size values when cumulative distribution of particles of the carbonized product on a particle size distribution curve reaches 0.1%, 100%, 10%, 50% and 90% respectively; p1, P2 and P3 are the microporosity, the mesoporosity and the macroporosity of the activated product respectively; n is the average pore size of the activated product. By utilizing the method, relevant conditions and parameters of carbonization and activation can be properly adjusted, the porous silicon-carbon material with excellent performance can be rapidly prepared and has higher silicon-carbon first effect and silicon-carbon capacity, and a prepared battery is lower in expansion rate and higher in cycle capacity retention rate.

The invention relates to the field of battery materials, in particular to a lithium ion battery which comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm located between the positive pole piece and the negative pole piece, the electrolyte comprises boron-containing lithium salt, based on the total mass of the electrolyte, the mass percentage of the boron-containing lithium salt is 2wt%-10wt%, and the mass percentage of the diaphragm is 10wt%-10wt%. The diaphragm comprises a base film and a gluing layer located on at least one surface of the base film, and the coverage rate of the gluing layer is 5-70%. The boron-containing lithium salt has a relatively large anion volume, so that surface charges of anions can be delocalized, dissociation of the lithium salt is facilitated, and the conductivity of the electrolyte and the transference number of lithium ions are improved. Meanwhile, a large number of fluorine elements in the boron-containing lithium salt can stabilize the lithium supplement agent material and reduce the oxidation of the electrolyte. The gluing layer can improve the bonding force between the diaphragm and the positive pole piece, shorten the migration path of lithium ions and shorten the migration time of the lithium ions; meanwhile, the gluing layer can weaken diffusion of large-volume anions.

This application discloses a hollow cage-like silicon-carbon composite anode material and its preparation method. The hollow cage-like silicon-carbon composite anode material has an internally hollow cage-like structure. The cage-like structure is formed by the self-assembly of a 3D network structure, which includes a framework and multiple carbon spheres. The framework includes silicon material, specifically one-dimensional linear silicon material, and the multiple carbon spheres are attached to the silicon material. Compared to existing porous carbon frameworks, the hollow cage-like silicon-carbon composite anode material disclosed in this application not only has higher capacity and conductivity but also possesses the flexibility lacking in porous carbon. When other anode materials, especially silicon-based anode materials, are loaded into the hollow structure, the cage-like structure can provide more expansion space for the internal anode material, thereby more effectively improving the cycle stability of the anode material.

The invention discloses a preparation method of a double-side coated positive pole piece and a solid-state battery, and belongs to the technical field of solid-state batteries. A positive active material, a solid electrolyte and a conductive agent are taken as raw materials, a glue solution and a solvent are added and stirred to prepare positive slurry, and the positive slurry is coated on two sides of a current collector and is subjected to vacuum drying to prepare the double-side coated positive pole piece. The invention also provides a solid battery which is prepared by laminating the double-sided coated positive pole piece prepared by the method, an electrolyte pole piece and a negative pole piece. According to the invention, the operation content of double-sided coating of the positive pole piece is simplified, the step of combining multiple current collectors is avoided, the thickness of the double-sided coating layer of the positive pole piece can be controlled, the utilization rate of the positive pole slurry is improved to the maximum extent, and the energy density of the battery is improved; steps existing between the two positive electrodes during single-side coating are eliminated, the problems of unevenness of positive electrode planes and breakage of current collectors are avoided, and comprehensive and good contact of positive electrode / electrolyte interfaces is kept.

A method for preparing sodium-ion battery anode materials based on MDF waste belongs to the interdisciplinary technical field of carbon materials and sodium battery energy materials. Using scraps or recycled waste MDF as a matrix, the material undergoes coarse crushing, dry activation and mixing, and temperature-controlled carbonization to obtain porous hard carbon, which, after sieving, is used as the anode material for sodium-ion batteries. By employing a multi-stage temperature-controlled process combined with mild activators, precise control of the hard carbon structure is achieved, improving the material's electrochemical performance. The prepared sodium-ion battery anode material exhibits a high reversible charge-discharge capacity (up to 311 mAh / g) and good cycle performance.

The present application discloses a composite material and a preparation method thereof, a solid-state battery and an electrical device. The composite material of the present application comprises a core and a coating layer arranged on the surface of the core; the material of the core comprises graphite; the material of the coating layer comprises a sulfide solid electrolyte. The preparation method of the composite material comprises the following steps: adding the sulfide solid electrolyte and graphite into a first solvent, dispersing and heating to obtain the composite material. A solid-state battery comprises a positive electrode, a solid electrolyte layer and a negative electrode, wherein the negative electrode comprises an adhesive, a conductive agent, a first sulfide solid electrolyte and the composite material. The composite material of the present application can promote the wettability of the electrolyte in the negative electrode, facilitate the full contact between the electrolyte and the negative electrode, and can solve the problems of poor cycle stability of solid-state batteries and complex negative electrode preparation process.

This invention provides a coal-based hard carbon anode material, its preparation method, and its applications. The preparation method includes the following steps: introducing industrial waste gas into raw coal, sequentially performing pre-carbonization and pore-forming, followed by high-temperature carbonization to obtain the coal-based hard carbon anode material. The preparation method provided by this invention uses extremely low-cost industrial waste gas to perform pore-forming treatment on the raw coal material, greatly reducing the preparation cost, and the resulting coal-based hard carbon anode material has high capacity and excellent performance.

The application provides a pickling purification method of porous carbon for silicon-carbon negative electrode materials and a product thereof, and belongs to the technical field of battery material preparation. The method overcomes the defects of poor purity and long process flow of the existing pickling method. The production method comprises the following steps: crushing carbonization raw materials to 20-50 meshes, and then performing physical activation. The method further comprises the steps of "blowing and stirring cleaning" and "belt rinsing while simultaneously performing vacuum exhaust and controlling the water content to be 60%". The porous carbon is deeply and efficiently purified, so that the iron content and ash content of the porous carbon are reduced to a very low level (Fe<30ppm, ash content<0.2%), and the high-pore structure (iodine value≥1600mg / g) of the porous carbon is maintained. The unique blowing and stirring method has smaller shearing force on the carbon skeleton, and better protects the microstructure of the porous carbon. The belt rinsing is continuously operated, and has high automation degree, and is suitable for large-scale industrial production. The porous carbon product prepared by the method has very high purity and high specific surface area, and meets the needs of high-end lithium ion batteries.