195results about How to "Relieve swelling" patented technology

The invention relates to a lithium ion battery silicon-based composite anode material, a preparation method of the lithium ion battery silicon-based composite anode material, and a battery. The lithium ion battery silicon-based composite anode material adopts an embedded composite core-shell structure, a core has a structure formed by embedding nano silicon particles into a gap of an inner layer of hollowed graphite, and a shell is made from a non-graphite carbon material. According to the silicon-based composite anode material, mechanical grinding, mechanical fusing, isotropic compression processing and carbon coating technologies are combined, so that the nano silicon particles can be successfully embedded into the inner layer of the graphite and the surfaces of graphite particles are uniformly coated; the high-performance silicon-based composite anode material is obtained and is excellent in cycle performance (the 300-times cycle capacity retention ratio is more than 90%) and high in first efficiency (more than 90%); in addition, the silicon-based composite anode material is high in specific energy and compaction density, and can meet the requirements of a high-power density lithium ion battery; the preparation process is simple, the raw material cost is low, and the environment is protected.

The invention discloses a three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material, and a preparation method and an application of the composite material, and relates to a nano composite material, and a preparation method and an application of the nano composite material. The composite material, the preparation method and the application aim at solving the problems of poor stability and too low first cycle efficiency of existing molybdenum disulfide serving as a cathode active substance of a lithium ion battery. The method comprises the steps of 1, preparing a three-dimensional macroporous graphene / foam metal composite, 2, preparing a three-dimensional macroporous graphene / carbon nano tube / foam metal composite, 3, preparing a three-dimensional macroporous graphene / carbon nano tube, 4, loading molybdenum disulfide by a hydrothermal method, and 5, annealing the three-dimensional macroporous graphene / carbon nano tube loaded with molybdenum disulfide to obtain the three-dimensional macroporous graphene, carbon nano tube and molybdenum disulfide composite material.

The invention discloses a double-shell-layer structure composite material, a preparation method of the double-shell-layer structure composite material, and a lithium ion battery containing the composite material. The double-shell-layer structure composite material comprises a nanometer silicon inner core, wherein a first coating layer and a second coating layer are sequentially arranged on the surface of the inner core; the first coating layer is nanometer metal particles embedded on the surface of the inner core; pores are formed between the nanometer metal particles; the second coating layeris a carbon coating layer positioned at the outer most layer of the composite material. Firstly, a layer of metal hydroxide covers in situ on the surface of the nanometer silicon particles; then, thesurface is subjected to organic carbon coating; the coating layer organic carbon is subjected to high-temperature carbonization, metal hydroxide of the first coating layer is firstly decomposed intometal oxides and is then reduced into nanometer metal simple substance particles by the carbon coating layer of the second coating layer; a great number of pores are left; the double-shell-layer structure composite material is obtained. The process is simple; when the composite material is used for a negative electrode of the lithium ion battery, the high specific volume and excellent circulationperformance are realized.

The invention relates to a method for producing an interior wall healthcare latex paint by using lavender natural extract, which comprises the following steps: A) mixing surface-active agent, lavender essential oil and sustained-release agent, and stirring the mixture at a low speed at 20-30 DEG C for 20 minutes; B) keeping stirring at the low speed, adding the mixture obtained in step A) evenly into latex, and stirring for 10 minutes; C) adding water, titanium pigment, filling material and partial additives in accordance with formula quantity into a new agitation tank, and stirring at a high speed for 20 minutes; D) sending the materials obtained in step C) into a sand mill to grind until the fineness of the granule is less than 30mu m, and lowering the materials temperature below 30 DEG C; E) keeping stirring at the low speed, adding the mixture obtained in step B) slowly into the materials obtained in step D); and F) keeping stirring at the low speed, adding the surplus additives, and adjusting to get the expected viscosity, thus obtaining the product. The product has healthcare efficacy.

A multilayered material is provided that exhibits therapeutic effects for relieving the pain and swelling of various forms of arthritis (particularly osteoarthritis), delaying the onset of osteoarthritis, or preventing hypothermia or alleviating conditions caused by hypothermia. The flexible, breathable multilayered material includes a first layer of soft and hypoallergenic material (e.g., cotton, silk, linen), a second layer of soft, heat retentive material (e.g., wool, cashmere) contacting the first layer, and a third layer of water repellent material contacting the second layer. Additionally, the multilayered material provides a thin, flexible, breathable fabric that can be used to construct various garments, devices, and gears to combat harsh weather conditions.

The invention discloses a carbon-based composite material, a preparation method thereof and application thereof. The carbon-based composite material comprises micron-order soft carbon, micron-order hard carbon, a nano-active material, a first carbon coating layer and a second carbon coating layer, wherein the first carbon coating layer is coated on the surface of the nano-active material to form composite particles; the composite particles are dispersed on the surfaces of the soft carbon and the hard carbon and in the second carbon coating layer; the second carbon coating layer coats the softand hard carbon and the composite particles. The method disclosed by the invention comprises the following steps: 1) performing carbon coating on the nano-active material to form composite particles;2) dispersing the composite particles on the surface of the soft carbon and the hard carbon to form a first precursor; 3) performing coating modification by using an organic matter; 4) performing VC heating mixing or mixed kneading and molding; 5) sintering at a high temperature, thereby obtaining the composite material. The composite material disclosed by the invention is very suitable to serve as a negative electrode active material of the lithium ion battery, has high capacity and first charge and discharge efficiency and is excellent in rate capability.

The invention relates to alcohol fuel additive which has the advantages of anticorrosion of metals and inhibiting the swelling of rubber and solves the problems of metal corrosion and rubber swelling of the vehicle oil supply system and the transportation devices caused by the high proportion alcohol gasoline fuel; the alcohol fuel additive comprises the compositions calculated part by volume, including 5-8 portions of propargyl alcohol, 14-20 portions of malic acid diethyl ester, 8-14 portions of N-methyl morpholine and 18-26 portions of cyclohexane. The alcohol fuel additive has the advantages of inhibiting the metal corrosion effectively, moderating the swelling of the rubber and plastic parts caused by the alcohol fuel.

A negative electrode active material for a lithium ion battery is provided. The active material includes a composite formed by connecting a carbon material and black phosphorus through C-P bonds. The carbon material and the black phosphorus in the active material form the C-P bonds, thus ensuring tight contact between the carbon material and the black phosphorus in charge-discharge processes, and avoiding bad contact with the carbon material and a current collector when the black phosphorus is expanded. In addition, the carbon material is high in flexibility so that expansion of the black phosphorus can be relieved in the aspect of volume. The invention also provides a preparing method of the active material. The method includes mixing the carbon material and the black phosphorus, and then subjecting the mixture to ball milling at a ball milling speed of 300-700 r / min for 10-20 h, wherein the carbon material and the black phosphorus are connected through the C-P bonds to form the composite, and then the active material is formed. The method is simple and easy to operate. The invention also provides a negative electrode plate of the lithium ion battery and the lithium ion battery. The lithium ion battery has extremely high energy density and long cyclic lifetime.

A method for treating migraines is disclosed. The method utilizes a rapid drug delivery system which prevents deactivation or degradation of the active agent, including small molecules and peptides being administered to a patient in need of treatment. In particular, the drug delivery system is designed for inhalation for delivery of drugs to the pulmonary circulation in a rapid and therapeutically effective manner.

The invention relates to a fiber-reinforced composite refractory castable for a molten iron desulphurization lance and a preparation method of the fiber-reinforced composite refractory castable. According to the technical scheme, the method comprises the steps of dispersing the following raw materials in parts by weight: 1-4 parts of mullite powder, 3-5 parts of kyanite, 5-8 parts of fused dense corundum powder, 5-8 parts of alpha-Al2O3 micro powder, 4-7 parts of silica powder, 1-4 parts of silicon carbide powder and 5-7 parts of pure aluminum silicate cement and an additive into a flat container and mixing evenly by using a rake; adding the following raw materials in parts by weight: 10-15 parts of first-level bauxite chamotte, 30-38 parts of natural fused mullite, 20-25 parts of andalusite and 1-2 parts of high-purity fused mullite particles; and pouring the mixed materials into a stirrer for stirring to obtain the fiber-reinforced composite refractory castable for the molten iron desulphurization lance. The fiber-reinforced composite refractory castable is low in cost and wide in raw material source, the obtained product is good in mechanical property and thermal shock resistance, the service life of the molten iron desulphurization lance can be prolonged, and the desulphurization cost can be reduced.

The invention discloses a manufacturing method for a lithium ferric phosphate battery adopting a compound conductive agent. The manufacturing method comprises the following steps of: dissolving anode binder polyvinylidene fluoride in N-methyl pyrrolidone and stirring, thereby obtaining anode glue; adding a carbon nano-tube / conductive polymer compound material into the anode glue and scattering; adding anode active matter LiFePO4 and stirring, thereby obtaining anode slurry; uniformly coating the anode slurry on two surfaces of an aluminum foil, drying, and then rolling and slicing, thereby obtaining anode plates; uniformly mixing cathode active matter graphite, the carbon nano-tube / conductive polymer compound material, a cathode binder and de-ionized water, thereby obtaining cathode slurry; uniformly coating the cathode slurry on two surfaces of a copper foil, drying, and then rolling and slicing, thereby obtaining cathode slices; coiling, flatly pressing and banding, and then drying for 8 hours in vacuum at 65 DEG C; filling electrolyte into a dried battery; and forming an end product of the lithium ferric phosphate battery after filling the electrolyte. According to the manufacturing method provided by the invention, the capacity, multiplying power, circulation and safety property of the battery are greatly improved.

A multilayered material is provided that exhibits therapeutic effects for relieving the pain and swelling of various forms of arthritis (particularly osteoarthritis), delaying the onset of osteoarthritis, or preventing hypothermia or alleviating conditions caused by hypothermia. The flexible, breathable multilayered material includes a first layer of soft and hypoallergenic material (e.g., cotton, silk, linen), a second layer of soft, heat retentive material (e.g., wool, cashmere) contacting the first layer, and a third layer of water repellent material contacting the second layer. Additionally, the multilayered material provides a thin, flexible, breathable fabric that can be used to construct various garments, devices, and gears to combat harsh weather conditions.

The invention relates to the field of health care, in particular to an eye care apparatus. The eye care apparatus comprises an installation frame, an installation plate, eye socket massage mechanism and two temple massage mechanisms; the installation plate is installed in the middle of the installation frame, four slide chutes are formed between the installation plate and the installation frame, two connecting plates are arranged on two sides of the installation frame, the eye socket massage mechanisms are fixedly connected with the installation plate, the temple massage mechanism are respectively installed on the connecting plates, each eye socket massage mechanism comprises a driving assembly and two massage assemblies, the massage assemblies are symmetrically arranged and are fixedly connected with the installation plate, and the massage assemblies are connected with the driving assembly. The eye care apparatus has the advantages that eye strain and swelling pain can be relieved through operation of the eye socket massage mechanisms and the temple massage mechanisms, eye temperature can be reduced through fitness of two water filling cushions and the eyes, comfortableness is improved, and the eye care apparatus is ingenious in structure, convenient to carry and low in cost.

The invention provides a lithium-sulfur battery positive electrode material and a preparation method thereof. The lithium-sulfur battery positive electrode material comprises a porous carbon material for accommodating sulfur and a metal sulfide loaded on the outer layer of the porous carbon material, wherein sulfur in the porous carbon material containing the sulfur comprises elemental sulfur with multiple pore channels and liquid metal in the pore channels of the elemental sulfur. The elemental sulfur with the multiple pore channels is adopted, so that the expansion of the electrode material can be reduced, and the ion conduction can be enhanced. The contact resistance between the carbon material and the elemental sulfur is reduced by the liquid metal in the elemental sulfur with multiple channels, and the contact area between the elemental sulfur and the conductor is increased, so that a catalytic effect is achieved on the elemental sulfur to form the polysulfide. Metal sulfides outside of carbon materials are capable of absorbing S<2-> formed in the discharging process. Through the synergistic adsorption catalysis effect of the liquid metal in the elemental sulfur with the pore channels and the metal sulfides wrapping outside the sulfur-loaded porous carbon, the electrode material is enabled to have high energy density and high cycling stability.

The invention discloses an application of nocardia rubra cell wall skeleton (N-CWS) in preparation of drugs for treating skin lesions, which comprise at least one of eczema, neurodermatitis, non-specific dermatitis, atopic dermatitis, and psoriasis. N-CWS is used to treat skin diseases including eczema, neurodermatitis, non-specific dermatitis, atopic dermatitis, and psoriasis, can effectively relieve the symptoms of lesions such as exudation, swelling, red spots, toughened epidermis, lichenification, scaling, itching, and the like, reduces the skin damage caused by scratching and chronic friction, and finally improves and cures the skin diseases.

The embodiment of the invention provides a charging method and device. For one thing, the charging process comprises a first charging stage and a second charging stage when a battery is charged in the embodiment; the first charging stage comprises at least two charging sub-stages; the battery is successively subjected to first constant current charging and second constant current charging in each charging sub-stage; and then the battery is subjected to constant voltage charging until the current of the battery reaches to a stop current in the second charging stage. Therefore, the technical scheme provided by the embodiment can solve the problems that the existing charging mode may result in accumulation of battery polarization and the battery has relatively big potential safety hazards along with the improvement of the charging speed.

The invention relates to a lithium ion battery negative electrode material and a preparation method thereof. The lithium ion battery negative electrode material has a three-layer core-shell structureand is composed of an inner core material, a silicon monoxide middle layer and a carbon-coated outer layer. The surface of the inner core material is pretreated in a non-oxidizing atmosphere, and a specific temperature gradient is formed by heating and silicon monoxide steam so that a nano silicon monoxide layer is deposited on the surface. By adjusting the thicknesses of an element-doped carbon coating layer and a silicon monoxide deposition layer, the lithium ion battery negative electrode material with high electronic conductivity, low volume expansion and excellent cycle performance and rate capability is obtained. The preparation method comprises the following steps: 1) putting a material capable of generating the silicon monoxide steam into a reaction bin, putting the inner core material into a rotary collection bin, vacuumizing, and heating; 2) carrying out vapor deposition of silicon monoxide to the surface of the inner core material; and 3) after cooling, carrying out carbon coating on the material in the collection bin.

The invention an alcohol-proof film and a film electrode, which can be directed, used in alcohol fuel battery and their preparing method, relating to the technique of fuel battery. Said alcohol-proof film is palladium film or palladium-base alloy film whose thickness of film is 0.05-50 micrometer, and the palladium amount of film is 70-100%. The structure of film electrode formed by alcohol-proof film is multi-layer, comprises anode diffuse layer, cathode diffuse layer, anode catalytic layer, cathode catalytic, electrolytic film and the alcohol-proof film, while the alcohol-proof film is arranged on the side of anode or the cathode, or be arranged between two Nafion electrolytic films. Said prepared film electrode has better property when charge-in at low temperature and high concentration, so it has much ascendant in the application for the self-contained portable breathing power at the indoor temperature. The electrode also can be used in sensor device and electrochemical device.

The invention discloses a carbon-coated stannous oxide compound. The carbon-coated stannous oxide compound is prepared by the steps of dissolving trihydroxymethyl aminomethane into water, stirring and preparing into a buffer solution; weighing the buffer solution, adding stannous oxide, stirring to form a black turbid solution; adding dopamine and continuously stirring; performing washing, centrifuging and drying; and performing calcining in nitrogen atmosphere to obtain the carbon-coated stannous oxide composite material. Dopamine is used as the carbon source for coating the surface of SnO, so that volume expansion of SnO in a circulation process is relieved, thereby improving the cycling performance in the application when SnO is used as a negative electrode material of a sodium ion battery; in the synthesis process, the solvent is non-toxic and harmless, the cost is relatively low and the operation is simple; the carbon-coated stannous oxide composite material has the most major advantage of excellent cycling performance; the initial-circle charging specific capacity can be close to 500mAh / g and the capacity is barely attenuated after 300 cycles, so that possibility is provided for the actual application of the composite material in the sodium ion battery material in the future.

The invention relates to medical equipment, in particular to an adjustable leg-raising device used for raising a wounded leg or a postoperative leg. The device of the invention comprises an underframe, a sliding cross bar, a near-side regulating bracket, a far-side regulating bracket, a flexible cross bar and a dhoosootie. The invention adopts the adjustable leg-raising device to replace the traditional soft pillow, soft cushion or Brown's bracket, has the advantages of strong flexibility, good stability, reliable function and simple and convenient operation, can better satisfy clinical requirements, is favorable for bedridden patients to carry out functional training as soon as possible, improves the compliance and reliability of the patients on therapy, can realize the standardization and scientificalization of the operation method and control standard for raising the wounded leg, and is beneficial to guiding clinical work.

The invention discloses a compound magnesium sulphate wet packing and a preparation method thereof. The compound magnesium sulphate wet packing consists of 20 to 50 percent of magnesium sulphate, 0.1 to 4 percent of lidocaine, the balance being surplus water for injection and medical carrier. The preparation method comprises the steps of soaking the medical carrier in compound magnesium sulphate solution for thirty to sixty minutes after being made into sheets and being disinfected and sterilized, sterilizing the medical carrier with steam for thirty to forty-five minutes, and then putting the medical carrier into a plastic bag to be sealed and packed to prepare the compound magnesium sulphate wet packing. The compound magnesium sulphate wet packing can effectively prevent chemotherapy phlebitis; and the clinical trials show that through the compound magnesium sulphate wet packing, the effective rate of caring and treating swelling and pain caused by edema on local subcutaneous tissue when chemotherapy drugs are instilled in the vein of the patient is over 90 percent, thereby reducing the pain of the patient effectively and improving the quality of life of the patient.

The embodiment of the invention relates to a lithium battery negative electrode material containing a pre-lithiated silylene material, a preparation method and a lithium battery. The negative electrode material has a core-shell structure, wherein an inner core is a mixture of the pre-lithiated silylene material and carbon particles, and an outer shell is one or more carbon-containing layers; the mass ratio of the inner core to the negative electrode material is [80%, 99%]; the mass ratio of the pre-lithiated silylene material in the inner core to the inner core is [10%, 90%]; the mass ratio ofthe outer shell to the negative electrode material [1%, 20%]; the pre-lithiated silylene material is of a sheet structure, and a phase comprises nano silicon and / or silicon oxide and lithium silicate; and the lithium silicate is one or more of Li4SiO4, Li2SiO5 and Li2SiO3. The negative electrode material effectively alleviates the expansion problem of the negative electrode material through the flaky characteristics of silylene or silylene oxide; by lithiating the silylene material in advance, the first charge-discharge efficiency of the negative electrode material is improved; and through carbon coating on the surface layer, the negative electrode material has the advantages of long cycle and high cycle stability.

The invention belongs to the technical field of lithium ion capacitors, and discloses a molybdenum disulfide-based composite material for a negative electrode of a lithium ion capacitor and a preparation method thereof. The method includes: (1) Ammonium molybdate tetrahydrate or ammonium molybdate, aniline, phosphorus and graphene oxide were mixed uniformly in water; the pH value of the reaction system is adjusted to 4-5, the reaction temperature is kept to obtain the precursor; (2) the precursor reacts under acidic condition and initiator to obtain intermediate product; Acidic condition refers to pH 1.7 - 2.3 of the reaction solution; 3) dispering that intermediate product and thiourea in water, and place the intermediate product and thiourea in a hydrothermal reaction device for hydrothermal reaction to obtain molybdenum disulfide matrix composite material. The method of the invention is simple and efficient. As that composite material obtain has excellent electrochemical propertiesand cycle stability, the composite material has excellent lithium storage performance in a lithium ion capacitor negative electrode material, and has wide application prospect in a lithium ion capacitor.

The invention provides a silicon-based composite material and a preparation method thereof. The silicon-based composite material provided by the invention comprises a silicon-based matrix, a fast ionconductor layer coating the surface of the silicon-based matrix, and a carbon layer coating the surface of the fast ion conductor layer. A fast ion conductor of the fast ion conductor layer is LiAlSixOy, x is greater than or equal to 1, and y is greater than or equal to 1. According to the invention, the specific fast ion conductor layer LiAlSixOy and the carbon coating sequentially coat the surface of the silicon-based matrix, so that problems of relatively high charge transmission impedance and relatively low power output of the silicon-based negative electrode material are effectively improved, and the rate capability is improved; and meanwhile, the specific double coating layers are matched, so that the expansion of the silicon-based material is effectively relieved, and the cycle performance is improved.

The invention provides a method for manufacturing ultra-high temperature long-service life nickel-hydrogen batteries. The method comprises the following steps: manufacturing positive pole pieces; manufacturing negative pole pieces. The method has the benefits that due to the application of a positive pole novel material, a negative pole novel material and a negative pole protection material, the 80-degree high-temperature efficiency is 80% or above; by acquiring the 80-degree high-temperature high charging efficiency, the efficient conversion of electric energy and discharging chemical energy from ordinary temperature to high temperature (20-80 DEG C) is guaranteed, generation of side reactions is greatly controlled, the abundant alkali liquor amount greatly postpones invalidation of batteries, the durable service (long service life) of batteries is ensured, the cycling service life reaches 1500 times (IEC 61951 division 7.5.1.2), and the batteries can satisfy the use requirements of electric devices in special fields, such as emergency lights, dust collectors and vehicle-mounted electric devices.

The invention discloses a fuel element as well as a preparation method and application thereof. The fuel element disclosed by the invention is a sphere which sequentially comprises a fuel layer, a non-fuel layer, and a housing layer which are concentric from inside to outside, wherein the non-fuel layer is made from conventional base materials in the field. The fuel element has the advantages of being small in density, having the non-fuel layer which can alleviate swell generated in the service process of the fuel layer, being not liable to rupture, high in power density, fast in heat dissipation and the like; and besides, the housing layer is compact in structure, high in compressive strength, and capable of preventing fused salt from infiltrating and fission products from releasing, and can be used for reactors. The preparation method is simple and low in cost.

The invention discloses an AA-MBBR sewage treatment system. The AA-MBBR sewage treatment system comprises a water inlet pond, a water inlet pump, an anoxic MBBR pond, a main reaction pond, a sludge refluxing pump and a secondary sedimentation tank. The water inlet pond is connected to the anoxic MBBR pond via a water inlet tube through the water inlet pump; the main reaction pond is divided into an aerobic MBBR pond positioned in the outer ring and an anaerobic pond positioned in the inner ring; a water outlet tube of the anoxic MBBR pond is connected into the anaerobic pond in the inner ring of the main reaction pond through a pipeline; an aerator tube is arranged at the bottom in the aerobic MBBR pond and is provided with an aerator; a refluxing hole is formed in the bottom of the anaerobic pond; a water inlet hole which communicates to the inside of the aerobic MBBR pond is formed in a position, which is close to the bottom, of the anaerobic pond; a water outlet is formed in the upper part of the outer side of the main reaction pond and is connected into the secondary sedimentation tank via a pipeline; the bottom of the secondary sedimentation tank is connected with a refluxing tube; and the secondary sedimentation tank is connected to the refluxing hole of the anaerobic pond via the refluxing tube through the sludge refluxing pump. The AA-MBBR sewage treatment system is high in nitrogen and phosphorus removal ability and good in effect.

The invention provides an active anode material, a preparation method thereof and a lithium ion battery. The active anode material comprises a core and a shell covering the outer surface of the core,wherein the core comprises an amorphous stannous pyrophosphate matrix as well as a silicon material and a carbon material which are dispersed in the amorphous stannous pyrophosphate matrix, and the shell is carbon. The preparation process is simple, and the anode active material has good cycle performance and excellent rate performance.

The invention discloses a silicon-carbon composite negative electrode material and a preparation method thereof. The silicon-carbon negative electrode material comprises a nano-silicon material whichis prepared from nano-silicon and a conductive polymer material and is coated with a conductive carbon film on the surface, and the nano silicon material coated with the conductive carbon film is uniformly distributedin the spherical graphite, on the surface of the spherical graphite and on the surface of the graphene to form a nano silicon / graphite / graphene structure, and two layers of organic carbon sources are uniformly coatedon the nano silicon / graphite / graphene structure to obtain the silicon-carbon negative electrode material. The conductive polymer material and two layers of organic carbon sources are coated on the surface of the nano silicon, so that the conductivity of the silicon is enhanced, and the expansion of the silicon is inhibited; aslurry is subjected to drying and twiceroasting in a short time through three times of spray drying, so that the silicon-carbon negative electrode material which is relatively good in silicon dispersion effect and is uniformly coated withorganic pyrolytic carbon is obtained; the preparation method of the silicon-carbon composite negative electrode material is simple, environment-friendly, rich in used raw materials, low in equipment cost and suitable for industrial production and application.

The invention relates to a silicon carbon composite material. The silicon carbon composite material comprises a nanometer silicon core and a porous carbon shell, wherein the porous carbon shell is coated outside the nanometer silicon core, the porous carbon shell wraps the nanometer silicon core in a form of three-dimensional layer sheet pedal-shaped amorphous carbon, and a gap is formed between the porous carbon shell and the nanometer silicon core. The silicon carbon composite material has excellent electrochemical performance when used as a battery negative electrode material; and comparedwith a silicon raw material negative electrode material, the specific capacity and the cycle property of the silicon carbon composite material are remarkably improved, the specific area and the conductivity of the material can be substantially improved by a three-dimensional layer sheet pedal-shaped porous structure of the material, the strength and the flexibility of the material are improved, and the expansion problem of the silicon negative electrode is effectively solved. The invention also comprises a preparation method of the silicon carbon composite material.