296 results about "Silicon nanoparticle" patented technology

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method of the silicon-carbon composite negative electrode material. The method comprises the following steps: preparing a porous carbon substrate, and depositing silicon nanoparticles in pores and on the surface of the porous carbon substrate by adopting a fluidized bed chemical vapor deposition process and taking silane as a silicon source to obtain a silicon-carbon core material; continuously carrying out carbon coating on the surface of the silicon-carbon core material in the fluidized bed by taking acetylene as a carbon source to form a carbon coating layer; and leading out the obtained material from the fluidized bed, taking acetylene as a carbon source, and carrying out carbon coating on the surface of the primary carbon coating layer again by adopting the rotary furnace to form a secondary carbon coating layer. According to the preparation method, a porous carbon matrix and double-layer functional carbon coating process is adopted, so that the volume expansion of silicon in the circulation process is remarkably inhibited, the interface side reaction is reduced, and the circulation stability of the material is effectively improved.

The invention relates to the technical field of batteries, in particular to a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The invention provides a silicon-carbon negative electrode material. The silicon-carbon negative electrode material comprises silicon nanoparticles, a porous carbon skeleton, an amorphous carbon layer and a carbon material array structure, pores of the porous carbon skeleton are filled with the silicon nanoparticles; the amorphous carbon layer is coated on the surface of the porous carbon skeleton; the carbon material array structure vertically grows on the surface of the amorphous carbon layer; the carbon material array structure comprises a carbon nanotube array and / or a graphene array. According to the silicon-carbon negative electrode material disclosed by the invention, the compressive strength and the conductivity of the silicon-carbon negative electrode material are improved by vertically growing the carbon nanotube array and / or the graphene array on the surface; therefore, the cycle performance and the rate capability are improved, and the cycle expansion rate is reduced.

The invention provides a sphere-like silicon-carbon negative electrode material and a preparation method and application thereof, and particularly relates to the technical field of negative electrode materials, the negative electrode material comprises a sphere-like porous carbon skeleton, silicon nanoparticles distributed in the sphere-like porous carbon skeleton, and an amorphous carbon layer coating the surface of the sphere-like porous carbon skeleton, the particle appearance of the sphere-like porous carbon skeleton is of a round irregular or asymmetric polyhedral structure and comprises one or more of a potato shape, an ellipse shape, an olive shape, a long strip shape and a pomegranate shape, the particle of the sphere-like porous carbon skeleton is provided with a plurality of asymmetric faces, fillets are formed between the faces, and the radius of the fillets does not exceed 20 microns. The problem of structural damage of the material under the action of external force such as rolling can be effectively relieved, good mechanical stability is kept, excellent bonding performance can be achieved in the electrode coating process, the ion transmission path of the material is improved, and the electronic conductivity and the lithium ion diffusion performance are improved.

The invention provides a silicon-based composite material, a preparation method thereof and a negative electrode. The silicon composite material comprises a porous matrix, silicon nanoparticles and heteroatoms, the porous matrix is provided with a three-dimensional cross pore channel with multistage pore diameters, the pore channel contains at least one silicon nanoparticle, the heteroatoms at least partially coat the surfaces of the silicon nanoparticles, and / or the heteroatoms are spaced among the silicon nanoparticles. According to the silicon-based composite material provided by the invention, the porous matrix is adopted as a substrate material to load the silicon nanoparticles and the heteroatoms doped in the silicon nanoparticles, and the silicon nanoparticles are separated and bound by doping the heteroatoms in the silicon nanoparticles, so that the size and distribution of the silicon material in pore channels are controlled; the silicon material is uniformly dispersed in the three-dimensional crossed pore channels of the porous matrix, so that the volume effect of silicon in the charging and discharging process is effectively relieved, the collapse of the composite material structure caused by the expansion of lithium-intercalated silicon is prevented, and the cycling stability of the electrode is improved.

The disclosure relates to a composite material for a secondary lithium-ion battery, and a preparation method therefor and the use thereof. The composite material for a secondary lithium-ion battery is such that: the interior thereof is a spherical porous hard carbon material having hollow holes, and a product resulting from the decomposition and deposition of a silicon-containing gas and one or more gaseous compounds containing any element of C, N, B and P are deposited in the pores, wherein the product comprises silicon nanoparticles, and the porous hard carbon material is obtained by means of curing a hard carbon matrix using a double emulsion method and then carbonizing same.

The invention discloses a biosensor for detecting Alzheimer's disease markers as well as a construction method and application thereof, and relates to the technical field of biosensors. The construction method comprises the following steps: after a glassy carbon electrode is cleaned, dropwise adding a RuSi NPs (at) CS compound on the surface of the glassy carbon electrode to obtain a RuSi NPs (at) CS / GCE electrode; and immersing the RuSi NPs coated CS / GCE electrode into a PHL: S double-chain solution, and carrying out an incubation reaction to obtain the biosensor. The RuSi NPs (at) CS compound is obtained by carrying out mixed reaction on ruthenium-silicon nanoparticles and chitosan; pHL: S double chains contained in the PHL: S double-chain solution are obtained by carrying out incubation reaction on carboxyl-activated PHL chains and S chains. The biosensor has the advantages of high accuracy, strong sensitivity, good selectivity and the like, and can be applied to accurate detection of the Alzheimer's disease marker A beta oligomer.

The invention provides a silicon-based composite material, a preparation method thereof and a negative plate. The silicon-based composite material comprises silicon-based composite material particles, the silicon-based composite material particles comprise a porous substrate and silicon particles loaded in pores of the porous substrate, the silicon particles comprise at least one silicon nanoparticle and an oxygen-enriched layer at least partially coating the silicon nanoparticle, the oxygen-enriched layer is made of SiOx, x is more than 0 and less than or equal to 2, and x is more than 0 and less than or equal to 2. And the oxygen content in the oxygen-rich layer is in gradient change along the direction from the center to the surface of the silicon nanoparticle. According to the silicon-based composite material provided by the invention, the plurality of silicon particles taking the silicon nanoparticles as the core and the oxygen-enriched layer as the shell are loaded on the porous substrate, and the oxygen content in the oxygen-enriched layer is in gradient change, so that the conductivity of the silicon-based composite material is improved; moreover, the volume expansion of silicon in the lithium intercalation process can be relieved by utilizing the oxygen-enriched layer with the gradient change of the oxygen content, the expansion rate of the electrode is reduced, and the cycle performance of the battery is further improved.

The present invention discloses a silicon active material for ultra-high capacity secondary batteries, which uses nano-sized silicon dioxide particles as a matrix, and the surface of the silicon dioxide particles is directionally coated with a mixed solution, and silicon nanoparticles with a three-dimensional structure are formed after a high-temperature reduction reaction in a hydrogen environment. The obtained nanoparticles are coated with a surface conductive layer to obtain a silicon active material with a mechanically and electrochemically stable three-dimensional structure. The present invention also provides a preparation method and use of the above-mentioned silicon active material for ultra-high capacity secondary batteries. The silicon active material of the present invention has the characteristics of ultra-high specific capacity, stable cycle performance, and low cost, high flexibility in raw material selection, low price, and simple preparation process.

The invention belongs to the field of functional material preparation, and particularly relates to a preparation method of a silicon-yttrium-carbon composite lithium ion battery negative electrode material, which comprises the following steps: (1) dispersing silicon nanoparticles, polyvinylpyrrolidone and yttrium salt in a deionized water solution to form a mixed solution, carrying out ultrasonic vibration dispersion, and then carrying out magnetic stirring in a room temperature air atmosphere; (2) transferring the obtained solution to a glass culture dish, and performing freeze drying in a freeze dryer; (3) transferring the precursor obtained by drying into a crucible, and placing the crucible in a tubular furnace for high-temperature calcination to obtain a silicon-yttrium-carbon composite material; and (4) grinding and mixing the obtained product with sodium alginate, conductive carbon black and deionized water respectively, uniformly coating the surface of a copper foil with the mixture, and then performing drying, slicing and tabletting treatment to obtain a target product. The preparation method is simple in synthesis process, good in electrode cycling stability, stable in structure and excellent in electrochemical performance.

The invention provides a carbon material, application of the carbon material, a silicon-carbon composite material, a negative electrode and a battery, and particularly relates to the technical field of carbon materials and secondary batteries. The carbon material has the characteristics of a porous structure and graphitization at the same time, and has the following characteristics: i) the N2 adsorption pore volume is 0.4-2.0 cm < 3 > / g; ii) the N2 adsorption average pore size is 1.8 to 5.0 nm; and (iii) partial graphitization is carried out, disordered carbon and graphitized carbon are compounded, a diffraction peak P exists between 2theta = 25-30 degrees in an XRD (X-Ray Diffraction) pattern, and the grain size of P calculated according to a Scherrer formula is 2-40 nm. The invention also provides a silicon-carbon composite material, the silicon-carbon composite material comprises a porous carbon material and silicon nanoparticles, the porous carbon material comprises the carbon material provided by the invention, and the silicon nanoparticles are located in pore channels of the porous carbon material. The silicon-carbon composite material provided by the invention has the advantages of high capacity, high first efficiency and high cycle stability when being applied to the lithium ion secondary battery.

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a high-energy silicon-carbon composite negative electrode material for a lithium ion battery and a preparation process of the high-energy silicon-carbon composite negative electrode material. The preparation method comprises the following steps: mixing resin-based activated carbon and biomass activated carbon with specific pore volume and compressive strength according to a mass ratio of 1: (0.2-0.3) to obtain a porous carbon matrix; depositing silicon nanoparticles on the porous carbon substrate by adopting a fluidized bed chemical vapor deposition process; depositing a thin carbon layer on the surface of the silicon-carbon core material by taking acetylene as a carbon source; and carrying out secondary carbon coating by adopting a rotary furnace to form the silicon-carbon negative electrode material. According to the composite negative electrode material prepared by the process, the resin-based activated carbon is used as a main matrix, so that the influence of more impurities and non-uniform pore structure distribution of biomass activated carbon on the cycling stability and conductivity of the silicon-carbon negative electrode material is reduced, and the problems of volume expansion and conductivity of the silicon-based negative electrode material are solved.

The invention discloses a carbon-silicon negative electrode material, a preparation method thereof and a battery, and belongs to the technical field of carbon-silicon materials. The silicon content in the negative electrode material is 40-70wt%, the specific surface area is less than or equal to 3m < 2 > / g, the micropore volume is less than or equal to 0.001 m < 3 > / g, and the average grain size of silicon grains is less than or equal to 2nm; in a dQ / dV-V curve, h1 / h2 is greater than or equal to 1.5, and h1 and h2 are respectively lithium removal oxidation peak intensities corresponding to 0.28-0.32 V and 0.44-0.48 V. The preparation method comprises the following steps: carrying out surface passivation treatment on a precursor obtained by carrying out nanometer silicon vapor deposition on a carbon base material, and carrying out carbon coating in a rotary kiln, the method is simple, and the obtained negative electrode material has a double-layer coating structure, a relatively low specific surface area and relatively high mechanical strength, and is suitable for large-scale production. And the rapid volume expansion of the buffer silicon nanoparticles in the repeated lithiation / lithium removal process is facilitated, so that the negative electrode material has relatively high capacity and cycle performance.

The invention discloses an ultra-stable anti-bioadhesion coating as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The coating provided by the invention comprises a component A and a component B, the component A comprises nanoparticles, carboxyl silicone oil, a silane coupling agent and a solvent; the component B comprises a base material and a solvent; the nano-particles comprise at least one of silicon nano-particles, iron nano-particles or zinc nano-particles; the base material comprises epoxy resin. Through cooperation of the component A and the component B, the carboxyl silicone oil and the functionalized nanoparticles are combined and embedded into a matrix material, the formed coating can be used for preparing an ultra-stable anti-bioadhesion coating, the stability is good, the durability is good, adhesion of blood components, protein, bacteria, cells and the like can be effectively reduced, and the anti-bioadhesion performance of the coating is improved. The coating and the coating prepared from the coating have good application prospects in implantable medical equipment.

The invention discloses a porous silicon-carbon composite negative electrode material, a one-step preparation method, a lithium ion battery and application, and belongs to the technical field of lithium ion battery materials, the method comprises the following steps: mixing a silicon source, magnesium powder, a carbon source and a soluble pore forming agent to obtain mixed powder; performing high-energy mechanical ball milling on the mixed powder in an inert atmosphere, and performing acid pickling, high-temperature carbonization treatment, cooling, water washing, suction filtration and drying to obtain the porous silicon-carbon composite negative electrode material; the porous silicon-carbon composite negative electrode material comprises a porous shell formed by amorphous porous carbon and a porous core formed by silicon nanoparticles embedded in the porous shell, the mechanical collision energy generated in the high-energy mechanical ball milling process triggers the low-temperature magnesiothermic reduction reaction between the silicon source and the magnesium powder, the carbon source is attached to the surfaces of silicon particles while the silicon particles are generated, and silicon synthesis, carbon coating and pore forming are synchronously achieved. The silicon-based negative electrode has the advantages of high initial coulombic efficiency, high specific capacity, excellent cycle stability and rate capability, and effectively solves the problems of volume expansion and large-scale preparation of the silicon-based negative electrode.

The invention provides a silicon-based material and a preparation method thereof, a lithium ion battery monomer, a battery device and a power utilization device, the silicon-based material comprises a porous carbon matrix and silicon nanoparticles located in pores of the porous carbon matrix, the surface of each silicon nanoparticle is provided with a silicon oxide passivation layer formed through a passivation reaction, the ratio of the ID / IG of the silicon-based material to the ID / IG of the porous carbon matrix before the passivation reaction is (0.95-1.05): 1; the mass multiple of the Si element and the C element in the silicon-based material is recorded as A, the mass multiple of the Si element and the C element before the passivation reaction is recorded as B, and the ratio of A to B is (0.95-1.05): 1. According to the invention, the thermal safety performance, the cycle performance and the rate capability of the lithium ion battery monomer can be improved.

The invention relates to the technical field of lithium battery materials, and particularly discloses a spherical silicon-carbon negative electrode material and a preparation method and application thereof, and the spherical silicon-carbon negative electrode material comprises an inner core and a coating layer coating the inner core; the inner core comprises porous hard carbon doped with nitrogen element and a carbon layer coated outside the porous hard carbon, and silicon nanoparticles are deposited in the porous hard carbon; and the coating layer is a trimethyl aluminum functionalized polyethylene oxide cross-linked network coating layer. The spherical silicon-carbon negative electrode material provided by the invention is coated by the methylaluminum functionalized polyethylene oxide cross-linked network, the coating layer can provide a transmission channel for ions, promote the transmission of the ions and facilitate the enhancement of the lithium storage performance of the negative electrode material, and the high-strength three-dimensional network structure can effectively inhibit the volume expansion of the silicon-carbon negative electrode material, so that the lithium storage performance of the negative electrode material is improved. And the particles are prevented from cracking or powdering.

A silicon-carbon composite material and a preparation method therefor, a negative electrode and a battery specifically relate to the field of battery technologies. The silicon-carbon composite material is composed of silicon-carbon composite material particles, wherein the silicon-carbon composite material particles include a C / C composite porous material and silicon nanoparticles located in pore channels and on a surface of the C / C composite porous material; the C / C composite porous material includes a first carbon material and a second carbon material; the first carbon material is a porous carbon matrix, and the second carbon material is distributed throughout an interior of the C / C composite porous material and further throughout the silicon-carbon composite material. For the silicon-carbon composite material provided, by introducing the second carbon material to prepare the C / C composite porous material, a strong and tough electroconductive network is formed between the C / C composite porous material and the silicon nanoparticles, thereby avoiding silicon from losing contact with the carbon matrix material when changing in volume, and further improving electronic and ionic conductivities of the silicon-carbon composite material, and prolonging service lifetime of the material.

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a high-capacity silicon-carbon negative electrode material and a preparation process thereof. The preparation process comprises the following steps: preparing biomass activated carbon with the total pore volume of 1.0-1.3 cm < 3 > / g and the compressive strength of 20-40 Mpa; depositing silicon nanoparticles in pores and on the surface of the porous carbon matrix by adopting a fluidized bed chemical vapor deposition process to obtain a silicon-carbon core material; depositing a thin carbon layer on the surface of the silicon-carbon core material by taking acetylene as a carbon source; and carrying out secondary carbon coating by adopting a rotary furnace to form the silicon-carbon negative electrode material. According to the silicon-carbon negative electrode material prepared by the process, the mechanical stability and the cycling stability of the material are improved; meanwhile, the large-pore-volume porous activated carbon provides sufficient deposition space for the silicon nanoparticles, the reversible capacity is effectively improved, and volume expansion of silicon in the circulation process can be remarkably inhibited.

The invention provides a preparation method of dendritic mesoporous silicon bionic nanoparticles loaded with RNA (Ribonucleic Acid) molecules, which comprises the following steps: preparing dendritic mesoporous silicon nanoparticles DMSNs by adopting a double-phase layering method, dissolving a surfactant CTAC and a catalyst TEA in water to serve as a water phase solution, dissolving ethyl silicate TEOS in cyclohexane to serve as an oil phase, slowly dropwise adding the oil phase into the water phase, and reacting for 2-4 hours to obtain the dendritic mesoporous silicon bionic nanoparticles loaded with the RNA molecules. The DMSNs nanoparticles are obtained; amino groups are introduced to the surfaces of DMSNs through gamma-aminopropyltriethoxysilane APTES so as to enhance electrostatic attraction to nucleic acid, and after a surfactant template is removed, the DMSNs are mixed with RNA molecules in ribozyme-free water; meanwhile, a cytoplasmic membrane is harvested by using a hypotonic method, and the dendritic mesoporous silicon bionic nanoparticles loaded with the RNA molecules are prepared through ultrasonic treatment and polycarbonate film extrusion. The method is simple and convenient, and has a wide application prospect in RNA delivery.

The invention discloses a porous silicon carbon negative electrode material, a preparation method thereof and a battery. A matrix of the porous silicon carbon negative electrode material is porous carbon, a conductive layer is deposited in pores of the porous carbon, a fast ion layer is deposited on the surface of the conductive layer, a silicon nanoparticle layer is deposited on the outer side of the fast ion layer, and carbon coating layers are deposited on the surface of the porous carbon and among silicon nanoparticles. According to the method, the conductive layer is firstly deposited, then the fast ion layer is deposited, and a Li reaction place is changed from point-to-point contact of silicon particles and porous carbon into surface-to-surface contact of the conductive layer and the conductive ion layer, so that a Li < + > desolvation barrier and electronic impedance of a substrate are greatly reduced.

The invention discloses a hard carbon silicon-based negative electrode material and a preparation method and application thereof. The preparation method of the hard carbon silicon-based negative electrode material comprises the following steps: mixing silicon nanoparticles with a polyacrylonitrile solution A to obtain a mixture A, drying the mixture A, and carbonizing to obtain a primary carbon-coated material; and mixing the primary carbon-coated material with a polyacrylonitrile solution B to obtain a mixture B, drying the mixture B, and carbonizing to obtain the hard carbon silicon-based negative electrode material. According to the hard carbon silicon-based negative electrode material and the preparation method thereof, the surfaces of the silicon particles are subjected to two-time carbon coating, and compared with single-time carbon coating, the obtained hard carbon silicon-based negative electrode material has higher conductivity, lower impedance and higher capacity retention ratio.

The invention discloses a nanometer silicon-based negative electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion battery negative electrode materials. The invention relates to a preparation method of a nano silicon-based negative electrode material, which comprises the following steps: uniformly mixing silicon nanoparticles, a surface modifier and a solvent to prepare a surface modification reaction suspension of nano silicon, carrying out stirring reaction, centrifugally separating out bottom precipitate, and drying to obtain surface-modified nano silicon; dispersing the surface-modified nano silicon into a methanol solution, adding zinc nitrate and 2-methylimidazole, dissolving the zinc nitrate and the 2-methylimidazole to obtain a uniform suspension, performing stirring reaction, performing centrifugal separation to obtain bottom precipitate, and washing and drying the precipitate to obtain composite material powder; and sintering the composite material powder in a reducing atmosphere to obtain the nano silicon-based negative electrode material. The problems of poor structure uniformity, insufficient pore structure optimization, high cost and complexity, weak interface bonding and the like are solved.

The invention relates to a monkey pox virus nano vaccine based on an STING agonist and silicon nanoparticles as well as a preparation method and application of the monkey pox virus nano vaccine. The nano vaccine comprises a monkey pox virus antigen, the silicon nanoparticles and the STING agonist, the monkey pox virus antigen is combined to the surface of the silicon nanoparticle through a DogTag-DogCatcher system; the STING agonist is connected to the surface of the monkey pox virus antigen. The monkey pox virus antigen is covalently coupled with the silicon nanoparticles, and the antigen is displayed on the surfaces of the particles in a specific spatial orientation manner, so that the multivalence and accessibility of the antigen are enhanced, the shielding effect of the silicon nanoparticles on epitopes of the antigen is reduced, and the immune response induced by the vaccine is higher than that of a monomer immunogen protein.

The invention discloses a solid-state battery negative electrode material and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The preparation method comprises the following steps: uniformly mixing silicon nanowires, silicon nanoparticles, a carbon nanofiber precursor material and a solvent, preparing a negative electrode material precursor by adopting electrostatic spinning, and carrying out pre-oxidation treatment and carbonization treatment to prepare the solid-state battery negative electrode material, wherein the mass ratio of the silicon nanowires to the silicon nanoparticles is 1: (0.1-4). According to the invention, the silicon nanowires and the silicon nanoparticles are cooperated, and the carbon nanofibers are used as a carrier to form a three-dimensional network structure, so that the diffusion path, anisotropic stress distribution and crushing resistance of Li can be shortened, the cycle performance is improved, and the carbon nanofibers not only improve the mechanical stability of Si in the cycle process, but also provide good conductivity for the electrode. The problems of volume change and low conductivity of the silicon negative electrode material in the use process are effectively solved, and the interface stability of the silicon negative electrode material and a solid electrolyte material is enhanced.

The invention discloses a silicon-carbon composite negative electrode material with silicon coated by porous carbon as well as a preparation method and application of the silicon-carbon composite negative electrode material, silicon nanoparticles (50-100nm) are taken as a core and are uniformly coated by a porous carbon layer derived from a zeolite imidazate framework material to form a core-shell structure (Si-C), and a silicon / carbon dual-phase coexisting composite material is constructed. The material is further doped with Ni, Co or Zn elements in situ, so that the conductivity and the catalytic activity are improved. The preparation method comprises the following steps: (1) carrying out solvothermal synthesis on a Ni / Co / Zn-ZIF precursor; (2) mixing the silicon nanoparticles with a ZIF precursor, and performing gradient carbonization (350-800 / 900 DEG C) to form a carbon-coated silicon structure; and (3) compounding with a conductive agent and a binder to prepare the negative pole piece. The silicon-carbon composite material disclosed by the invention has high silicon loading capacity (40-60wt%), and the first-circle discharge capacity reaches 1650mAh / g. The material is suitable for high-energy-density lithium ion batteries, and has the advantages of simple process, low cost and large-scale production.

A composition of matter includes silicon nanoparticles having nanopores disperse among the silicon nanoparticles, wherein the silicon nanoparticles have an average particle size of less than about 12 nm, and the nanopores have an average size of less than about 10 nm. An anode material includes a micron-sized assembly of silicon nanoparticles having an average particle size of less than about 12 nm, wherein the silicon nanoparticles are spaced by nanopores having average pore size of less than about 10 nm, and wherein the anode material is made by: dispersing the silicon nanoparticles in a solvent; and evaporating the solvent from the silicon nanoparticles to provide an evaporation-induced assembly of the silicon nanoparticles.

The invention relates to the technical field of medicine, in particular to a preparation method and application of a photodynamic-chemotherapy nano platform targeting tumor endogenous YAP1. The nano platform is hollow mesoporous silica nanoparticles (M (at) O-VNPs) loaded with oxaliplatin and VP of a macrophage membrane coating. The preparation method comprises the following steps: S1, synthesizing hollow mesoporous silica nanoparticles; s2, preparing the organic silicon nanoparticles loaded with the Verteporfin, and preparing the organic silicon nanoparticles loaded with the Verteporfin; s3, loading of the oxaliplatin; and S4, extraction and coating of a macrophage membrane. According to the invention, the macrophage membrane wrapped on the surface of the nano platform is utilized to provide good tumor targeting for the M (at) O-VNPs, and by camouflaging the macrophage membrane and the M (at) O-VNPs, not only are recognition and removal of an organism immune system successfully avoided, but also Verteporfin (VP) and oxaliplatin (OXA) can be delivered to a tumor site in a targeting manner, so that the tumor targeting of the drug is remarkably enhanced, and the drug has a good application prospect. The non-specific distribution in healthy tissues is reduced, and the systemic toxicity is reduced.

A silicon-carbon composite negative electrode material containing lithium-rich long-chain composite salt comprises a silicon-carbon composite material slurry, the silicon-carbon composite material slurry comprises a plurality of silicon-carbon composite material particles, and each silicon-carbon composite material particle comprises an element-doped silicon nanoparticle, a first carbon coating layer and a second carbon coating layer, the element-doped silicon nanoparticle is a core, the surface of the element-doped silicon nanoparticle is coated with the first carbon coating layer, the first carbon coating layer is coated with the second carbon coating layer, and the doped element is one or more of IIIA group elements, VA group elements or transition metal elements; the lithium-rich long-chain composite salt comprises a plurality of composite ion bridging structures, and each composite ion bridging structure comprises a plurality of cations, a first anion group and a second anion group, the first anion group and the second anion group form the composite ion bridging structure through the plurality of cations, and the plurality of cations comprise lithium ions.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly discloses a nanometer silicon / high-entropy alloy oxide / carbon composite lithium ion battery negative electrode material with a honeycomb-like three-dimensional hierarchical nanometer structure and a preparation method of the nanometer silicon / high-entropy alloy oxide / carbon composite lithium ion battery negative electrode material. The preparation method comprises the following steps: respectively adding PVP and silicon nanoparticles into deionized water, and stirring for 12-24 hours; adding oxysalts of iron, nickel, cobalt, chromium and manganese with equal molar weight, stirring for 12-24 hours, and then freeze-drying for 24-48 hours; and finally, putting the freeze-dried product into a tubular furnace, and calcining at high temperature in an inert atmosphere to obtain the composite lithium ion battery negative electrode material. A half battery prepared from the composite lithium ion battery negative electrode material prepared by the method has high initial specific discharge capacity and excellent capacity retention ratio, and the preparation method of the composite material is simple and convenient to operate, low in cost and suitable for large-scale production, and provides a new idea for preparation of a silicon-based composite electrode.

The invention discloses a core-shell structure silicon-based negative electrode material, a preparation method thereof and a lithium ion battery, and the preparation method comprises the following steps: (1) depositing an amorphous silicon oxide layer on the surface of a silicon particle to obtain a first product; (2) coating the first product by utilizing a carbon source and a biomass carbon source, and calcining to obtain a second product; (3) depositing a carbon layer on the outer layer of the second product to obtain core-shell structure carbon-coated silicon nanoparticles; and (4) dispersing and mixing the core-shell structure carbon-coated silicon nanoparticles and a carbon source, and carrying out vacuum drying, roasting, crushing and screening to obtain the core-shell structure silicon-based negative electrode material. The deposition in the step (1) and the deposition in the step (3) are both LPCVD (low pressure chemical vapor deposition). The silicon surface is uniformly coated and modified, and a good ion pathway is constructed, so that the silicon-based negative electrode material which is uniform in coating, small in volume expansion, high in ion transmission capability and good in comprehensive performance is formed.