327results about "Nanotechnology" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

This invention discloses a method for fabricating a highly sensitive long-wavelength infrared superconducting single-photon detector. It fully utilizes and amplifies the acoustic mismatch effect between the superconducting thin film and the substrate to achieve phonon localization enhancement on the superconducting nanowires. The effect of this innovative design is to increase the energy utilization rate of long-wavelength infrared photons on the superconducting nanowires, thereby improving the response sensitivity of the superconducting nanowires to long-wavelength infrared photon signals. Compared to existing designs that reduce the cross-sectional size of the superconducting nanowires, create holes beneath the nanowires, or increase the buffer layer, this invention is easier to implement and has higher scalability.

The application relates to the technical field of sodium ion batteries, and particularly discloses a negative electrode sheet based on an anodic aluminum foil and a preparation method thereof, which comprises: a honeycomb-shaped porous current collector including a pure aluminum foil layer and a nano-porous aluminum oxide layer, wherein the nano-porous aluminum oxide layer is obtained by sequentially performing anodic oxidation and acid corrosion on the aluminum foil current collector; a first coating layer, which is a high-specific-energy phosphorus-doped material and is embedded in the porous structure of the nano-porous aluminum oxide layer; and a second coating layer, which is made of hard carbon material and is coated on the first coating layer. In the application, the aluminum foil is treated by anodic oxidation to obtain a honeycomb-shaped nano-porous aluminum oxide layer, and then the thickness and pore size of the oxide layer are regulated by acid corrosion treatment, so that the surface roughness of the aluminum foil is improved, the adhesion between the electrode sheet and the current collector is improved, and the volume expansion of the phosphorus-based material is inhibited through the embedding design of the first coating layer, thereby improving the cycle stability and safety of the battery.

The application relates to the technical field of nanomaterial preparation, and particularly discloses a carbon nanotube preparation method based on carbon source and plasma time sequence cooperation and a carbon nanotube. In the gas phase deposition process, carbon source gas is input in a pulse mode, and a pulse type plasma is synchronously applied, wherein the carbon source input pulse and the plasma output pulse are time-differently matched, the carbon source supply window and the plasma action window form a non-fully-synchronized time sequence coupling relationship, the carbon source activation, transportation, deposition and structure reconstruction process are controlled in the time dimension, and meanwhile, the carbon source gas is introduced from a position close to the plasma action area to maintain the pulse opening and closing characteristics. The method can improve the growth selectivity of the carbon nanotube, reduce the defect density, and is suitable for controllable preparation of single-wall carbon nanotubes. The single-wall carbon nanotube with a semiconductor content greater than or equal to 83% can be prepared with high selectivity, and the product has the advantages of few defects, high purity and high yield.

The application discloses an optoelectronic device, a preparation method thereof and a display device. The optoelectronic device comprises a first electrode, a photoelectric functional layer, a carrier functional layer and a second electrode which are stacked in sequence, wherein the carrier functional layer comprises inorganic nanoparticles, the inorganic nanoparticles have a sheet structure, and the average sheet diameter of the sheet structure is greater than or equal to 50 nm. The optoelectronic device has high light emitting efficiency.

The present invention provides a method for placing the tip (106) of a probe (1106) of a nanomanipulator (104) onto a sample (102, 1102), particularly in a vacuum. The probe (1106) includes a cantilever (108) and a tip (106) attached thereto. The nanomanipulator (104) further includes an excitation unit (1110), the probe (1106) being mechanically coupled to the excitation unit (1110). The method includes the following steps: - when the tip (106) is not in contact with the sample (102), by providing a harmonic... A resonant drive signal (1010) is used to oscillate the probe (1106); - during a first approach phase, the first distance along the z-direction between the tip (106) and the sample (102) is reduced until at least one of a first set of stop conditions is met, wherein the first set of stop conditions includes detecting a shift in the frequency of the resonant drive signal (1010) used during the first approach phase; and - the first approach phase is terminated when the at least one of the first set of stop conditions is met, and the resonant drive signal (1010) is deactivated.

Provided in the present disclosure is amorphous iron phosphate. The X-ray diffraction pattern of the amorphous iron phosphate has a first diffraction peak θ1 and a second diffraction peak θ2 at 19-21° and 28-30°, respectively, and the ratio of the peak intensity I1 of the first diffraction peak to the peak intensity I2 of the second diffraction peak is 0.8-0.91. The amorphous iron phosphate is spherical or sphere-like particles. Further provided are a preparation method for the amorphous iron phosphate, and anhydrous iron phosphate prepared on the basis of the amorphous iron phosphate.

This invention discloses a method for preparing lignin nanoparticles with uniform particle size and its applications. The method involves fully dissolving industrial lignin in an aqueous solution of inorganic salts in acetone, filtering, and then adding an aqueous solution of inorganic salts of the same concentration to complete self-assembly, resulting in a dispersion of lignin nanoparticles with uniform particle size. Centrifugation yields the lignin nanoparticles with uniform particle size. This invention provides a simple, easily controllable, and highly reproducible nanoparticle preparation method. Furthermore, compared to mechanical methods, interfacial crosslinking, and emulsion methods for preparing lignin nanoparticles, it offers advantages such as significantly shortened process flow and reduced costs, demonstrating potential for large-scale industrial production.

This invention relates to the field of lithium battery anode material technology, specifically a polymer sieving interface silicon-carbon anode material for all-solid-state batteries, its preparation method, and its application. It comprises a porous carbon material matrix with micropores / mesoporous pores of 1-5 nm in diameter. A silicon-carbon composite matrix is ​​first formed by depositing a 1-2 nm diameter nano-silicon layer within the pores of the porous carbon material matrix. Then, a polymer layer is deposited on the surface of the silicon-carbon composite matrix to form a silicon-carbon anode material with nano-confined pores and a polymer sieving interface layer of 2-50 nm thickness and an elastic modulus of 0.1-15 GPa. The polymer layer is formed by cross-linking and polymerizing at least one polymerizable monomer containing ether bonds with at least one cross-linking agent. The preparation process is simple and mature, showing great promise for industrialization. It solves the problems of interface instability and slow ion transport kinetics in existing technologies, meeting the operating requirements under low external pressure conditions, enabling all-solid-state batteries to possess both high specific energy and long cycle life.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

The application relates to a three-dimensional hollow network structure boron nitride, and a main process of a preparation method thereof is as follows: taking citric acid, sodium borate and strontium carbonate as raw materials, a boron-containing precursor is obtained through a sol-gel method; then, the boron-containing precursor is pre-nitridated under a nitrogen-containing atmosphere to obtain a pre-nitridation product; next, the pre-nitridation product is uniformly mixed with ammonium borate and ammonium chloride through ball milling, and then is placed into a high-pressure reaction kettle to react, so that the three-dimensional hollow network structure boron nitride is obtained. The three-dimensional hollow network structure boron nitride prepared by the application has a connected network structure formed by multiple cavity units, has high purity, provides a new idea for preparation of a hollow boron nitride structure, and has a good application prospect in the fields of gas adsorption, water pollution treatment, hydrogen storage and a drug carrier.

The application provides a reduced graphene oxide powder, which is obtained through carbonization after twice oxidation-reduction processes. After one-time low-degree oxidation-reduction and secondary high-degree oxidation, large-diameter graphene is inserted deeper in the oxidation process, and the oxidation is more sufficient, so that the reduced graphene oxide with low powder resistivity and high specific surface area is obtained.

The application provides a metal organic framework material patterning additive manufacturing method, and relates to the technical field of additive manufacturing.The application proposes a new strategy of MOF micro-nano additive manufacturing based on mechanical chemical fixation and hydrothermal conversion, and the application utilizes the mechanical friction effect of a friction pair on the surface of a base material to fix metal oxide precursor micro-nano structures in a preset track in a directional and quantitative manner, so as to form an accurate patterned prototype; then, the fixed precursor is reacted with an organic ligand through a hydrothermal reaction, so as to be directionally converted into a corresponding MOF structure.The application implements the patterning construction of the precursor and the conversion of the MOF in steps, so as to not only ensure the fineness of the precursor structure, but also ensure the sufficiency and crystallinity of the MOF conversion.The whole process does not need a mask, does not need electron beam exposure, and does not need a developing solution treatment, has low requirements on equipment, is simple to operate, has a cost significantly lower than that of a traditional photolithography technology, and has good material universality and base adaptability.

The present application provides a kind of porous carbon and carbon nanotube combined preparation system and method, including activation fluidized bed, carbonization fluidized bed and carbon nanotube preparation fluidized bed;Activation fluidized bed is filled with energy carbon carrier, after oxygen and activating gas are imported, energy carbon carrier and oxygen occur combustion heat release, make activation fluidized bed temperature rise, first tail gas formed is imported into carbonization fluidized bed filled with carbon particle precursor, carbon particle precursor is carbonized under the action of high temperature carried by first tail gas, and generates carbide particle, and the second tail gas containing C1-C 30 ;Carbide particle is transported to activation fluidized bed, by controlling the gas flow rate of first gas inlet, so that carbide particle is always in the upper part of activation fluidized bed, and makes carbide particle activate in activating gas, and forms porous carbon particle;Second tail gas enters carbon nanotube preparation fluidized bed, and under the action of nanometer metal catalyst, C1-C 30 In it, is converted into carbon nanotube to realize low-cost co-production of porous carbon and carbon nanotube.

Provided are a nitrogen-doped cellulose-based carbon nano-carrier material, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: (1) pretreating a nanocellulose sol to obtain a uniformly distributed nanocellulose solution; (2) freezing the nanocellulose solution and vacuum drying same to obtain a nanocellulose aerogel; (3) pre-carbonizing the nanocellulose aerogel in an inert atmosphere, and cooling same to obtain a nanocellulose carbon aerogel; and (4) placing the nanocellulose carbon aerogel in urea powder, and performing high-temperature vapor deposition in an inert atmosphere to obtain the nitrogen-doped nanocellulose-based carbon nano-carrier material. The selected raw materials of the carbon nano-carrier material in the method are plant fibers, and have strong mechanical strength, wide sources and low costs. The prepared nitrogen-doped cellulose-based carbon nano-carrier material has good surface wettability, excellent electrical conductivity and stable properties.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The application provides a hydrogen sensor and a manufacturing method thereof, and relates to the technical field of gas sensors. The sensor electrode is manufactured based on a carrier, and at least one of microelectronic printing technology, screen printing technology, nanoimprint, spin coating or blade coating, and sputtering or evaporation in microelectronic technology is used to manufacture titanium dioxide and palladium nanoparticles on the sensor electrode, so as to manufacture a gas sensitive layer and form a hydrogen sensor, wherein the gas sensitive layer is connected with the sensor electrode. The hydrogen sensor and the manufacturing method thereof have the advantages of simple process, shortened response time of the hydrogen sensor, and improved sensitivity of the hydrogen sensor.

The application discloses a preparation method of silica with controllable particle size and morphology, and comprises the following steps: 1) mother liquor preparation: uniformly mixing an organic solvent, an alkali catalyst, an acid catalyst and water; 2) B liquid preparation: mixing alkoxy silane and the organic solvent, and stirring for a period of time; 3) particle nucleation: using a peristaltic pump to immerse a feed redistributor into the mother liquor, adding the B liquid into the mother liquor, and performing a silica particle nucleation reaction to obtain a seed solution; 4) particle regrowth: adding water and the alkali catalyst into the seed solution obtained in the step 3) and uniformly stirring; continuously adding the mixed solution of the alkoxy silane and the organic solvent into the seed solution by using the feed redistributor, and performing particle regrowth under stirring; 5) concentration and filtration: performing heating concentration on the sample, removing the organic solvent in the sample, and removing large particles in the sample by filtration. The application can finally control the particle size and morphology of the silica sol by effectively regulating the discharging mode and feeding position of the feed redistributor, and regulating the redistribution state of the feeding liquid in the mother liquor.

The application discloses a supported catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly mixing a mixed solution containing yttrium oxide, a ruthenium salt and an iridium salt with hydrochloric acid, and then heating to react to obtain a solid-liquid mixed gel; S2, performing drying treatment on the solid-liquid mixed gel obtained in the step S1 to obtain a solid; S3, crushing the solid obtained in the step S2 to obtain a powder, and placing the powder in a tube furnace to perform calcination treatment, and obtaining a supported hydrogen evolution catalyst after cooling. The preparation method provided by the application is green and safe in a preparation process, and provides an efficient and reliable solution for large-scale preparation of a hydrogen evolution catalyst with excellent performance and long service life.

This invention provides a method for preparing a composite nanofiber electron transport layer and a perovskite solar cell, belonging to the field of perovskite solar cell technology. It solves the problem of numerous defects existing on the surface and inside the electron transport layer of current perovskite solar cells. The method includes the following steps: dissolving PAN and SnCl2 2H2O in DMF to obtain a mixture, stirring the mixture in air for a period of time to form a precursor solution; placing the precursor solution into the syringe of an electrospinning apparatus, resulting in hemispherical droplets appearing at the tip of the syringe; using an electrospinning apparatus to obtain a SnCl2 2H2O:PAN composite fiber film with a diameter of nanometers on a prepared conductive substrate; calcining the prepared SnCl2 2H2O:PAN composite fiber film in air at 200°C to obtain pure SnO2:PAN composite nanofibers; and spin-coating a layer of SnO2 thin film onto both the upper and lower interfaces of the prepared SnO2:PAN composite nanofibers. This invention is applicable to perovskite solar cells.

The application discloses a kind of light information storage methods based on Au-NaYF4:Eu 3+ -Au array, according to the product induced by surface plasmon has the "memory" characteristics to the power induced its transformation, first plating a layer of gold island film on glass substrate, then NaYF4:Eu 3+ Nanoparticle is uniformly dropped on gold island film, and gold is sprayed on its surface to form Au-NaYF4:Eu 3+ -Au three-layer film structure with "memory characteristics", finally, Au-NaYF4:Eu 3+ -Au film surface is written in bright and dark controllable light-emitting array, by changing the power of excitation light to collect the fluorescence imaging of each point in the array, the bright and dark state of each point in the array is obtained and corresponds to digital information, so as to realize data reading.The method is simple and easy to operate, easy to quantify, has good application prospect in secret communication, anti-fake and measurement and control technology, and provides a new idea for data security transmission.

This invention relates to the field of novel nanomaterials and controlled synthesis, and discloses a high-entropy alloy, its preparation method, and its applications, comprising the following steps: preparing ZIF-67 hollow spheres, preparing a Co / NC precursor, preparing a high-entropy alloy precursor, and preparing the high-entropy alloy. This invention uses Co metal particles with nitrogen-doped carbon derived from ZIF-67 as a carrier as a precursor, and successfully introduces Ni, Fe, Cu, and Pt metals through an electro-displacement reaction to prepare NiCoFeCuPt high-entropy alloy nanoparticles, NiCoFeCu alloy nanoparticles, and NiCoFe alloy nanoparticles. The high-entropy alloy of this invention exhibits highly efficient and stable HER catalytic performance under both acidic and alkaline conditions.

The present application relates to the technical field of fracturing aids, and is a high-density medium imbibition improver for fracturing and a preparation method thereof.The high-density medium imbibition improver for fracturing is mainly obtained by compounding oligomers, outer core surfactants and inner core oil, wherein the oligomers are used to improve the submicron pore entry capacity by virtue of the small size of the oligomers; the outer core surfactants are used to give the surface active component sufficient time to occupy the pore wall surface to make the residual oil and the remaining oil be stripped by the surface active component, and then the residual oil and the remaining oil are assisted to be displaced under the capillary force; and the inner core oil is used to reduce the secondary aggregation probability of crude oil, so that the stripped crude oil is kept in the form of being cut to migrate out of the throat, thereby improving the recovery degree of tight oil and remaining oil. Therefore, the high-density medium imbibition improver for fracturing has good ultra-low adsorption capacity, gradual wetting reverse capacity and crude oil disassociation capacity, and has remarkable oil increasing effect by dialysis.

The application relates to the technical field of carbon material processing, and particularly discloses graphene and a preparation method thereof, the preparation method comprising the following steps: performing first heating treatment on a carbon source material under a first temperature; applying a first electric field to the carbon source material subjected to the first heating treatment to obtain an intermediate product; performing second heating treatment on the intermediate product under a second temperature; applying a second electric field to the intermediate product subjected to the second heating treatment to obtain graphene; wherein the first temperature is not lower than 800 DEG C, the second temperature is not higher than 3000 DEG C and higher than the first temperature; the intensity of the first electric field is not lower than 500 N / C, and the intensity of the second electric field is not higher than 20000 N / C and higher than the intensity of the first electric field. The aforementioned preparation method has the characteristics of wide raw material sources, can effectively reduce the dependence on fossil-based carbon sources, and can obtain graphene with few defects, high crystallinity and excellent electric conductivity under a relatively low activation energy.

This application provides a method for preparing nano-sized orthogonal iron phosphate and a method for preparing lithium iron phosphate cathode materials, relating to the field of electrode materials. The method for preparing nano-sized orthogonal iron phosphate includes: mixing a first ferrous salt solution with a first phosphorus source solution and an oxidant to perform a co-precipitation reaction to obtain amorphous iron phosphate; mixing the amorphous iron phosphate with water to form a slurry, controlling the slurry particle size, and then adding a crystal transformation aid to the slurry, followed by aging under stirring conditions at a pH of 0.8–1.5 to obtain nano-sized orthogonal iron phosphate; wherein the crystal transformation aid includes a second ferrous salt and a second phosphorus source. The iron phosphate prepared in this application is single-crystal nano-sized orthogonal iron phosphate, reducing the grinding pressure at the lithium iron phosphate end. Simultaneously, its unique octahedral structure is more stable than monoclinic iron phosphate produced by conventional processes, with fewer crystal defects and higher lattice integrity, effectively avoiding the generation of magnetic foreign matter during sintering and contributing to the performance of lithium iron phosphate materials.

The application discloses a feeding and heating remote control system for manufacturing nano metal powder, which comprises internet, a switch, and a server computer, and is characterized in that the system further comprises a metal material feeding device, a client APP, a single-chip microcomputer controller, a radar liquid level meter, an infrared thermometer, a high-frequency generator, a plasma power supply, and a high-temperature evaporation device; the server computer comprises CPU programming software and nano metal powder feeding and heating automatic control software; the client APP is a nano metal powder production feeding and heating remote control software, and a control interface of the client APP comprises plasma heating control, inductance heating control, furnace temperature setting, and feeding setting; the feeding setting comprises automatic feeding and manual feeding, and the automatic feeding comprises feeding amount setting and feeding frequency setting; due to the adoption of the internet and the client APP, feeding and heating intelligentization of nano metal powder production can be realized through remote control, production personnel can be saved, occupational hazards of operating personnel under high temperature can be avoided, production cost can be reduced, and the production efficiency of the nano metal powder can be improved.

The preparation of high-value-added aromatic carboxylic acids via CO2 carboxylation coupling through activation of the benzyl C-H bond in alcohols / amines is a green and sustainable pathway to achieve CO2 resource utilization and contribute to carbon neutrality. However, this field currently faces challenges such as poor catalyst selectivity, low CO2 activation efficiency, and a narrow substrate applicability range, making it difficult to meet practical application needs. To address this issue, this patent discovers that in a heterogeneous electrocatalytic system, cuprous selenide (V2), rich in selenium vacancies, can be used... Se -Cu 2‑x Using Se as the core catalyst, it can not only efficiently promote the synergistic activation of benzyl C-H bonds and CO2 carboxylation, significantly improving the overall catalytic activity of the reaction, but also achieve precise chemoselective carboxylation control for different types of substrates. Specifically, this V Se -Cu 2‑x Se electrocatalysts can efficiently and selectively activate the benzyl C-H bond in alcohols and subsequently induce CO2 carboxylation, exhibiting excellent chemoselectivity in the conversion of benzyl alcohol to mandelic acid and its derivatives. Simultaneously, they also demonstrate excellent catalytic performance for amines, selectively catalyzing the carboxylation of amine substrates such as benzylamine with CO2 to directionally generate phenylglycine and aromatic amine-derived carboxylates. Crucially, in addition to typical benzyl alcohol and benzylamine, the substrate applicability of this catalytic system can be extended to various alcohols and amine derivatives, realizing the carboxylation transformation from simple model substrates to diverse functional molecules, providing a new approach for the large-scale preparation of high-value-added aromatic carboxylates.

The application discloses a kind of fast charging type graphite-silicon carbon composite negative electrode interface modification method and lithium ion battery, belong to lithium ion battery technical field.The method includes: (1) providing graphite-silicon carbon composite negative electrode material;(2) on the surface of material by silane coupling agent chemical grafting forms organic-inorganic hybrid intermediate layer;(3) by chemical vapor deposition on the intermediate layer is constructed with lithium ion and electron conductivity nanoscale inorganic coating;(4) by in-situ polymerization is formed on the inorganic layer elastic polymer buffer layer, finally obtains the modified material with " chemical grafting layer-mixed conductive inorganic layer-elastic polymer layer " gradient interface structure.The gradient interface total thickness is 10-20 nm, electronic conductivity 1.0×10-3 S / cm, lithium ion diffusion coefficient is not less than 5.0×10-12 cm2 / s.Lithium ion battery containing the negative electrode is charged to 80% capacity at 25 DEG C, 3C rate required time ≤16 minutes, and capacity retention rate ≥85% after 500 cycles under this fast charging condition.The application constructs rigid and flexible integrated interface by three-step method, gradient transition, synergistically improves the fast charging performance, cycle stability and energy density of silicon-carbon negative electrode.

The invention herein disclosed refers to a method for preparation of glycerol nanocapsules (GNCs), adapted as an additive in a hydrophobic lubricant for improving lubricity in a tribological system, further to a glycerol nanocapsule (GNC) and finally to the respective use. The method comprises the steps of providing a continuous phase comprising at least a polyalphaolefin (PAO) and a dispersed phase comprising at least glycerol (GLY), of - mixing the continuous phase and the dispersed phase and performing high-pressure homogenization with a microfluidizer resulting in a minielmulsion comprising glycerol nanodroplets (GNPs). Further, adding a diisocyanate crosslinking agent (TDI) to the miniemulsion is comprised, leading to a polymerization reaction of the diisocyanate crosslinking agent (TDI) and glycerol (GLY) at the interfaces of the glycerol nanodroplets (GNPs) dispersed in the polyalphaolefin (PAO), resulting in formation of crosslinked glycerol-based polyurethan shells encapsulating a core of unreacted glycerol (GLY). Thereby glycerol nanocapsules (GNCs) are obtained, comprising a core of unreacted glycerol (GLY) encapsulated in a crosslinked glycerol-based polyurethan shell.

This invention discloses a modified graphite anode material for potassium-ion batteries, its preparation method, and its applications. The method includes acidification and intercalation treatment of nano-graphite powder, followed by thermal reduction with hydrazine hydrate to obtain a few-layer graphite material (GNS) with expanded interlayer spacing and abundant defects. The hydrazine hydrate reduction restores the conductivity of graphite while inducing a large number of intrinsic defects, providing additional capacitive potassium storage sites. The resulting material possesses both expanded interlayer channels and abundant defect structures, effectively alleviating the volumetric strain of potassium ion insertion / extraction and significantly improving ion diffusion kinetics. Potassium-ion batteries assembled based on GNS exhibit a reversible capacity exceeding the theoretical value of graphite in conventional low-concentration electrolytes, reaching 500 mA g. ‑1 After 1000 cycles, the capacity retention rate is no less than 87%, demonstrating excellent rate performance and cycle stability. This invention features a simple process and controllable cost, providing a highly promising anode material solution for potassium-ion batteries.