73 results about "Metal ion doping" patented technology

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention discloses light-driven toxin-enriched composite hydrogel as well as a preparation method and application thereof. The composite hydrogel comprises light-driven hydrogel and detection hydrogel, the light-driven hydrogel is agarose hydrogel doped with Au (at) Ag core-shell nano particles; the detection hydrogel is a double strand formed by an okadaic acid aptamer and a complementary sequence cDNA thereof, and a double strand formed by a domoic acid aptamer and a complementary sequence DNAzyme thereof, the hairpin H1 is used for modifying a quenching group BHQ2 at the 3'end, the hairpin H2 is used for modifying a fluorophore Cy3 at the neck part, the hairpin H3 is used for modifying a fluorophore FAM and a quenching group BHQ1 at the two ends respectively, and the metal ion doped agarose hydrogel is used for catalyzing DNAzyme cyclic shearing; and the photo-thermal driving unit is positioned on the detection function unit. According to the present invention, with the composite system of upper layer photo-thermal enrichment and lower layer dual-signal detection, the rapid and high-sensitivity simultaneous detection of the okadaic acid and the domoic acid is achieved through the combination of the photo-thermal transpiration effect and the HCR and DNAzyme cyclic shearing reaction;

The invention provides application of a metal ion doped aminated graphene oxide membrane material in catalyzing CO2 to synthesize cyclic carbonate. The metal ion doped aminated graphene oxide membrane material has an acidic catalytic site and an alkaline catalytic site at the same time, and a two-dimensional interlayer channel of the metal ion doped aminated graphene oxide membrane material also has a confinement effect. In the process of catalyzing a CO2 / epoxy compound cycloaddition reaction, epoxy compound molecules entering a two-dimensional interlayer confinement channel of the metal ion doped aminated graphene oxide membrane material are subjected to efficient ring opening under the combined action of organic amine molecules and metal ions and react with CO2; and finally, realizing CO2 high-efficiency (the reaction time is less than or equal to 5 minutes, and the conversion rate of the epoxy compound is 75-100%) synthesis of the cyclic carbonate under the conditions of room temperature and low pressure (greater than 0.1 MPa and less than or equal to 1 MPa).

This invention discloses a core-shell structured lithium-rich manganese-based cathode material with the general formula Li. 1+a Mn x Co y Ni z O 2‑b‑d (XO c ) b X d It has a core-shell structure, with the core being a disordered polyanion-doped lithium-rich manganese-based material, Li. 1+a Mn x Co y Ni z O 2‑b (XO c ) b The outer shell is made of lithium-rich manganese-based material Li, which is doped with gradient non-metallic ions. 1+ a Mn x Co y Ni z O 2‑d X d This application also provides a method for preparing a core-shell structured lithium-rich manganese-based cathode material. The method employs a combination of rapid Joule heating and surface plasma cleaning to prepare the aforementioned core-shell structured lithium-rich manganese-based cathode material, achieving a bulk disordered structure design with polyanion doping and a core-shell structure with surface gradient non-metallic ion doping. Specifically, the bulk polyanions can immobilize transition metal elements to suppress their migration to the lithium layer, reducing harmful consumption of active sites and stabilizing the crystal structure. Furthermore, the strong bond energy between the surface non-metallic elements and the transition metal elements can suppress transition metal dissolution during cycling, reducing irreversible oxygen oxidation and inhibiting harmful phase transitions.

The disclosure provides a metal ion doped lithium iron phosphate material and a preparation method and application thereof, and relates to the technical field of lithium batteries. The metal ion doped lithium iron phosphate material comprises flaky lithium iron phosphate and metal ions doped on the flaky lithium iron phosphate, and the flaky lithium iron phosphate has a porous structure. The method comprises the following steps: using an organic metal compound as a deposition raw material to deposit a carbon layer and metal oxide particles on the surface of a porous Fe2O3 flaky precursor to obtain a composite material; mixing the composite material, a lithium source and a phosphorus source according to a stoichiometric ratio, and then drying and sintering to obtain an M-LiFePO4 material. The M-LiFePO4 prepared by the disclosure has good uniformity and is not prone to agglomeration, inherits the two-dimensional flaky morphology of the precursor material and has a porous structure, has good rapid charging and discharging capacity, and improves the rate performance of the lithium iron phosphate material through doping of metal ions.

The invention discloses a high-performance long-cycle lithium iron phosphate positive electrode material and a preparation method thereof, and solves the technical problem of poor long cycle performance of existing lithium iron phosphate due to non-uniform and unstable carbon layer network. The preparation method comprises the following steps: S1, mixing and ball-milling iron phosphate A and iron phosphate B with different specific surface areas, lithium carbonate, a carbon source, an organic polymer dispersant and a metal ion doping agent to form precursor slurry; s2, drying the precursor slurry to obtain a precursor yellow material; s3, performing primary calcination on the precursor yellow material in an inert gas atmosphere to obtain lithium iron phosphate powder, and crushing the lithium iron phosphate powder; s4, uniformly mixing the crushed lithium iron phosphate with a carbon source, a nitrogen-containing organic matter and a metal ion doping agent, and carrying out spray drying after ball milling; and S5, carrying out secondary calcination on the spray-dried material in an inert gas atmosphere to obtain the lithium iron phosphate with the nitrogen atom-doped carbon coating layer. The lithium iron phosphate positive electrode material has the advantages of stable structure, good long cycle performance and the like.

The invention relates to a preparation method and application of a tooth antibacterial and mineralized dual-function anti-caries material. The anti-caries material provided by the invention comprises two components, namely a mineralizing solution I and a mineralizing solution II. The mineralization liquid I contains polyelectrolyte and soluble salt of antibacterial metal cations; and the mineralization liquid II contains phosphate and fluoride. The pH values of the two mineralizing solutions are both 9.5 + / -0.5. During use, the surface of a demineralized tooth is firstly cleaned, the mineralizing liquid I and the mineralizing liquid II are sequentially coated, flushing is performed after each action for 15 minutes, 1-3 cycles are performed every day, and continuous treatment is performed for 7-14 days. Through polyelectrolyte template guiding and antibacterial metal ion doping, a biomimetic mineralization layer with an antibacterial function is formed on the surface of the demineralized tooth, and the dual functions of antibacterial and remineralization are achieved. The material can significantly recover the mechanical properties of teeth, the elastic modulus and hardness recovery rates respectively reach 68.6% and 62.5%, the dental caries score is reduced by 70% or more, and the dental caries prevention material has an excellent dental caries prevention effect and a clinical application prospect.

The application provides a positive electrode material and a preparation method thereof, an electrochemical device and an electronic equipment, and particularly relates to the technical field of batteries. 1+x M 1‑x O2, wherein 0 3+ and Zr 4+ , the anion includes F ‑ , and the alkali metal ion includes Na + . The application can effectively improve the problems of low first coulomb efficiency, serious voltage attenuation and poor safety of the lithium-rich layered positive electrode material.

The invention discloses a high-capacity aromatic pinene formaldehyde adsorbent and a preparation method thereof, the adsorbent comprises a meso-porous silicon substrate, pinene covalently grafted on the meso-porous silicon substrate and metal ions doped in the meso-porous silicon substrate, pinene is alpha-pinene or beta-pinene, the pinene and hydroxyl contained in the meso-porous silicon substrate form a covalent bond through a silane coupling agent, and the metal ions are doped in the meso-porous silicon substrate. The grafting amount of pinene is 5-15 wt%, the metal ions are one or more of Zn < 2 + >, Cu < 2 + > and Ni < 2 + > and exist in the form of metal oxides or metal hydroxylates, and the doping amount of the metal ions is 0.5-3 wt%.

The invention discloses an alkylation catalyst and application thereof in raspberry ketone synthesis, and the preparation method of the catalyst comprises the following steps: (1) pretreatment: washing ion exchange resin with an alcohol solvent to remove impurities, and drying to obtain pretreated resin; (2) hydrophobization treatment: carrying out hydrophobization treatment on the resin pretreated in the step (1) and silane, and then washing and drying to obtain hydrophobized modified resin; and (3) metal ion doping: dipping the hydrophobic modified resin in a metal ion solution for doping, and then filtering, washing and drying to obtain the modified acidic cation exchange resin catalyst. When the catalyst is applied to raspberry ketone synthesis, the catalytic activity, the selectivity and the stability of the catalyst are superior to those of a traditional method and an unmodified catalyst, and the catalyst has remarkable industrial application value.

The invention relates to a preparation method and antibacterial application of an adjustable manganese-based Prussian blue analogue. Through metal ion doping and lattice engineering regulation and control, a manganese element is introduced into a Prussian blue frame structure, and controllable regulation of the doping amount and optimization of a crystal structure are realized. The prepared material has excellent photothermal conversion capability and multienzyme simulation activity, and shows a photothermal-enzyme synergistic enhancement effect under the irradiation of near-infrared light. In-vitro studies show that the material can efficiently inhibit the growth of gram-negative bacteria; animal experiments further verify that the composition has a remarkable curative effect in infected wound repair. The invention not only provides a preparation method of a nano material with controllable metal doping, but also provides a novel photo-enzyme synergistic treatment method for drug-resistant bacterium infection treatment.

The invention relates to the field of lithium ion battery positive electrode materials, and particularly discloses a preparation method and application of a co-doped ferrous phosphate precursor material.The preparation method comprises the steps that an antioxidant solution and a salt solution containing doped metal ions are added into a ferrite solution, and an iron source mixed solution is obtained; mixing and reacting a phosphorus source, an iron source and an alkaline solution to obtain blue ferrous phosphate slurry; and then filtering, washing, drying and crushing to obtain the doped ferrous phosphate precursor material. According to the invention, doping and morphology regulation and control are integrated in a single reaction system through a metal ion doping process, so that the preparation process is greatly simplified, and the compaction density and the rate capability of the prepared lithium iron phosphate positive electrode material are remarkably improved.

The invention discloses an alkaline secondary battery positive electrode cobaltate-doped additive and a preparation method and application thereof, the cobaltate-doped additive is composed of metal ion-doped cobaltate represented by a general formula MxN1-xCoO2, and the cobaltate-doped additive is prepared from a recycled waste lithium cobaltate positive electrode material as a raw material, the preparation method comprises the following steps: mixing a cobalt-containing intermediate with an M-containing metal compound and an N-containing metal compound according to a stoichiometric ratio, calcining, and adding the prepared additive into an alkaline secondary battery positive electrode as a performance enhancing component. According to the invention, high-valued recycling of the waste lithium battery material is realized, the process is green and environment-friendly, and the obtained additive can significantly improve the cycle life, rate capability and structural stability of alkaline secondary batteries such as nickel-hydrogen, zinc-nickel and the like, and has significant economic benefits and environmental benefits.

The application discloses a kind of metal ion doped dimanganese trioxide, preparation method and application thereof, manganese salt and metal nitrate are dissolved in glycerol and isopropyl alcohol, the ratio of manganese salt, metal nitrate and glycerol is (0.5-2) mmol: (0.1-0.5) mmol: (4-8) mL, to obtain mixed solution;The mixed solution is kept at 160-200 DEG C, and then the precipitate in the obtained reaction liquid is separated and then washed, dried, to obtain metal ion doped manganese glycerate;Metal ion doped manganese glycerate is calcined at 700-800 DEG C in oxygen atmosphere, to obtain metal ion doped dimanganese trioxide, by metal ion doping, adjust the electronic structure of dimanganese trioxide, improve the conductivity and optimize the ion transmission characteristics, to realize higher specific capacity, longer cycle life and better charge-discharge performance.

The application relates to the technical field of ferroelectric thin film multi-state memory, in particular to a multi-state memory based on a quasi-two-dimensional perovskite ferroelectric thin film and a preparation method thereof. The multi-state memory comprises, from bottom to top, a substrate, a patterned conductive bottom electrode, a multi-state storage layer and a top electrode; the multi-state storage layer is a metal ion doped quasi-two-dimensional perovskite ferroelectric thin film, and under the control of an applied electric field, the multi-state storage layer shows multiple light emission intensities for representing multiple information recording states. The material of the quasi-two-dimensional perovskite in the metal ion doped quasi-two-dimensional perovskite ferroelectric thin film comprises (CHA)2CsPb2Br7, (BA)2CsPb2Br7 or (BA)2CuCl4, and the metal ion comprises but is not limited to any one of Mn, Er and Tm. The multi-state memory has the advantages of high integration level and strong controllability; under ultraviolet excitation, different voltages can be applied to show different light emission intensities, and multi-state light information storage is realized.

This invention discloses a method for preparing bimetallic site-regulated metal-organic framework adsorbents and their application in capturing low-concentration toluene. The method uses MIL-101(Cr) as the substrate material and employs a solvothermal method to introduce Al in situ during the synthesis process. 3+ By regulating Al 3+ With Cr 3+ A bimetallic coordination structure was constructed using a specific molar ratio to obtain an Al-MIL-101(Cr) dual-site modified material. This material retains its original crystal framework structure and incorporates Al-O coordination structures and polymorphic porous structures within the framework, increasing the number of Lewis acid active sites. The material prepared in this invention is suitable for the adsorption of volatile organic compounds (VOCs) in the concentration range of 0-1000 ppm, and is particularly suitable for the adsorption treatment of low concentrations of toluene. This invention achieves multi-site synergistic regulation of MOF materials through a combination of metal ion doping and structural modulation, providing a new technical approach for the design of adsorption materials for low-concentration organic pollutants.

The application discloses a kind of anticorrosion functional composite fillers, preparation method and application, preparation method includes: respectively with fly ash, lamellar material as main filler, it is uniformly mixed with aniline, oxidizing agent, metal ion dopant, acid dopant, ethanol and water, after a certain time of reaction, functional fly ash filler and functional lamellar filler are prepared;Functional fly ash filler and functional lamellar filler are prepared under the action of chemical modifier and have long-acting anticorrosion filler with specific orientation.The application adopts the above-mentioned anticorrosion functional composite filler, preparation method and application, fly ash, lamellar material, metal oxide are compounded into functional filler with long-acting corrosion inhibition effect, and it is applied to water-based paint system, and excellent shielding performance and catalytic passivation activity are given to coating.

The invention belongs to the technical field of material synthesis and electro-catalysis, and particularly relates to a metal ion doped nickel phosphide catalyst and a preparation method and catalytic application thereof.The preparation method comprises the steps that salt containing metal ions, a nickel source, an organic ligand and a solvent are fully mixed, then a carrier is added, a hydrothermal reaction is conducted, and a metal ion doped Ni-organic ligand precursor is obtained; and then the metal ion doped Ni-organic ligand precursor is subjected to phosphating treatment, and the metal ion doped nickel phosphide is obtained. The preparation method of the material is simple, the prepared material simultaneously has alkaline hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) catalytic activity, and compared with traditional Pt and Ru-based catalysts, the use amount of Ru is reduced, the cost is reduced, and higher HER and UOR activity and stability are achieved. By coupling HER with UOR for hydrogen production, the problem of high energy consumption of full water splitting is solved thermodynamically, and the method has higher industrial application value.

The invention discloses a metal ion doped hard carbon material with a graphene coating and a preparation method and application thereof, the metal ion doped hard carbon material with the graphene coating is prepared through the steps of hard carbon precursor treatment, pre-carbonization treatment, metal salt mixing and in-situ growth, and the metal ion doped hard carbon material with the graphene coating can be used for preparing a sodium ion battery negative electrode material. The doping of different graphene coatings can be realized by selecting different types of liquid carbon sources, and the thickness of the graphene coating can be regulated and controlled by adjusting the carbonization treatment time or the gas flow rate of the liquid carbon source steam, so that the doped metal ions are effectively protected, the electrode structure is effectively stabilized, the reaction active sites are protected, and the electrochemical performance is improved. And the stability and the conductivity of the hard carbon material are remarkably improved.

The application discloses a composite material and a preparation method and quantum dot light emitting diode thereof, wherein the composite material comprises three-dimensional graphene and zinc oxide nanoparticles or metal ion doped zinc oxide nanoparticles loaded on the three-dimensional graphene. In the composite material, the zinc oxide nanoparticles or the metal ion doped zinc oxide nanoparticles are loaded in the three-dimensional graphene, so that the three-dimensional graphene can improve the conductivity of the composite material on one hand and effectively avoid the agglomeration between the zinc oxide nanoparticles or between the metal ion doped zinc oxide nanoparticles on the other hand; and the three-dimensional graphene also has good rigidity and good ductility, and can improve the film forming uniformity of the composite material.

The application discloses a kind of graphical substrate and its preparation method, LED epitaxial wafer.Preparation method includes: providing sapphire substrate;Sapphire substrate includes the substrate body and metal ion doping layer being arranged in layers, and the side surface of metal ion doping layer deviating from substrate body is sapphire substrate front;Mask layer is formed on sapphire substrate front;Using exposure developing process, mask layer is patterned to form mask pattern;Based on mask pattern, using dry etching process, sapphire substrate is etched to form multiple protruding structures on sapphire substrate front, and metal ions are doped in protruding structure.This application, metal ion doping layer can absorb light into sapphire substrate inside when exposure, avoid appearing secondary exposure phenomenon, improve mask pattern uniformity;Metal ion doped in protruding structure, can adjust the carrier concentration of epitaxial film layer, reduce the non-radiation process of extra electron in chip, improve the overall performance of chip.

This invention discloses a bimetallic ion-doped sodium vanadium fluorophosphate cathode material and its preparation method, belonging to the technical field of secondary battery cathode materials. The chemical formula of the sodium vanadium fluorophosphate cathode material of this invention is Na. 3‑x Mg x V 2‑y Ti y (PO4)2F3, where 0.01≤x≤0.03, 0.025≤y≤0.075. This invention, through synergistic optimization of the composition and preparation method of sodium vanadium fluorophosphate cathode material, promotes selective titanium doping at vanadium sites and selective magnesium doping at sodium sites, effectively improving the specific capacity, cycle stability, and rate performance of the cathode material. Therefore, sodium-ion batteries assembled using the cathode material of this invention exhibit superior overall performance, demonstrating good capacity retention under both high and low current density conditions, providing an effective way to improve the performance of sodium-ion battery cathode materials.

The present disclosure provides a thin film self-assembled from polymer(s), where the thin film includes a metal ion so it can further undergo ion exchange to incorporate an ion or blend of ions. Methods for making these thin films, subsequently top coating them so they can be freed from their original substrate, and methods of using these thin films are also disclosed.

This invention relates to a mud-based molecular sieve-supported α-MnO2 catalyst based on a dual regulation of acid treatment and metal impregnation. The method uses activated mud as raw material, synthesizing Na-type ZSM-5 molecular sieves via hydrothermal crystallization, followed by ion exchange to obtain H-type molecular sieves. Subsequently, α-MnO2 is loaded, and the acidity of the framework is adjusted through weak acid treatment to optimize the pore environment, improve the dispersibility and active site exposure of α-MnO2, and increase Mn content. 4+ The content of Cu promotes the generation of surface lattice oxygen and enhances the driving force of redox cycles. Further through Cu... 2+ Fe 3+ Ce 3+ Doping with metal ions enhances oxygen migration and catalytic oxidation capabilities. This catalyst exhibits excellent low-temperature activity, resistance to poisoning, and structural stability in the low-temperature catalytic oxidation of VOCs in oil fields. The process conditions are mild and environmentally friendly, and the raw materials are widely available, making it promising for industrial applications, particularly suitable for waste resource recovery and VOCs pollution control.

The invention relates to the fields of rare earth metal ions, reversed-phase colloid dispersion systems, doped nanocrystals and the like, in particular to a method for realizing rare earth metal ion core-shell doped zinc cadmium sulfide nanocrystals. The preparation method comprises the following steps: mixing aminated poly N-isopropylacrylamide, matrix metal salt, an aqueous solution of first rare earth metal salt and a solvent, and performing ultrasonic crushing to form a water-based nano reactor containing a first rare earth ion doped precursor; the preparation method comprises the following steps: carrying out ultrasonic pulverization on a poly (N-isopropylacrylamide)-polyethylene glycol amino copolymer, a matrix metal salt, an aqueous solution of a second rare earth metal salt and a solvent to form a water-based nano reactor containing a second rare earth metal ion doped precursor; mixing the two nano reactors, and performing high-pressure homogenization and nanocrystallization to form colloid; and adding the colloid into a sulfide aqueous solution, and sintering to obtain the rare earth metal ion core-shell doped nanocrystal. The rare earth metal ion doped nanocrystalline prepared by the method is of a core-shell structure, the diameter is 10-20 nanometers, and the thickness is 2-5 nanometers.

The application relates to the technical field of electromagnetic wave absorbing nanocomposites, and discloses a NiCo 2‑x Fe x S4@MoS2 electromagnetic wave absorbing material and a preparation method thereof. When the material is prepared, MoS2 is wrapped outside the NiCo2S4 crystal phase, the interface polarization is increased by adding MoS2 nanosheets while the metal ion doping introduces dipole polarization, so that the obtained NiCo 2‑x Fe x S4@MoS2 electromagnetic wave absorbing material has a hollow vacancy in the internal structure, effectively reducing the weight of the NiCo 2‑x Fe x S4@MoS2 electromagnetic wave absorbing material; meanwhile, when MoS2 is synthesized by using a hydrothermal method, a 1T@2H composite phase is combined, the phase structure is more complex, the product performance is improved through defects, vacancies and hollows, the product has the advantages of internal hollow, light weight, good wave absorbing performance and thin, wide, light and strong, and the problems that existing electromagnetic wave absorbing materials are difficult to realize the target of being thin, wide, light and strong are solved.

The application discloses a kind of metal ion doped magnetic medium cooperative core-shell structure wave-absorbing material and its preparation method and application.The core layer of the wave-absorbing material described in the application is iron-based material, and the shell layer is a manganese dioxide layer doped with metal ions coated on the surface of the core layer.By using a hydrothermal method to prepare magnetite nanoparticles with uniform size, and using potassium permanganate, manganese sulfate monohydrate and metal salt as reaction raw materials, the application continues to use a hydrothermal method to grow manganese dioxide doped with metal ions on the surface of the magnetite, forming a wave-absorbing material with a core-shell structure.The wave-absorbing material prepared by the application has multiple loss mechanisms such as dielectric loss, magnetic loss, internal reflection and scattering loss, has excellent wave-absorbing performance, and has a wide absorption frequency band, good impedance matching, a simple preparation method, and is suitable for continuous industrial production.

This invention provides a method for preparing and applying a double heterojunction passivated perovskite solar cell interface, relating to the field of perovskite solar cell technology. The method for preparing the perovskite solar cell interface involves modifying a TiO2 thin film transport layer with metal ion doping, preparing a SnO2 thin film on top of this film, and then spin-coating an oxyacid anion layer onto the SnO2 film surface to form a TiO2 / SnO2 / oxyacid anion double heterojunction electron transport layer; or directly adding oxyacid anions to a SnO2 solution to form a TiO2 / SnO2@oxyacid anion double heterojunction electron transport layer. This double heterojunction electron transport layer is applied to the fabrication of perovskite solar devices, superimposed with an interface layer to passivate the interface between the perovskite and the electron transport layer, reduce interface defects, and decrease non-radiative recombination of charge carriers at the interface, thereby improving the efficiency and stability of the perovskite solar cell and enhancing the transport capability of the electron transport layer.

The application belongs to the technical field of biological medicine, and discloses a super-small nanometer radiotherapy sensitizer as well as a preparation method and application thereof. The super-small nanometer radiotherapy sensitizer comprises a super-small hafnium oxide matrix doped with functional metal ions, preferably, the surface of the super-small hafnium oxide matrix doped with functional metal ions has a surface modification layer. The preparation method comprises the following steps: dissolving hafnium source in anhydrous ethanol, adding sufficient trifluoroacetic acid, and constant-temperature stirring, then vacuum rotary evaporation drying to obtain hafnium trifluoroacetate powder; adding the hafnium trifluoroacetate, an organic solution containing metal ions that can be doped into the super-small hafnium oxide matrix and oleylamine into a container and stirring, programmed heating and constant-temperature reaction for a period of time under vacuum or inert gas alternating protection, adding excess ethanol into the container to precipitate after cooling to room temperature, washing and drying the precipitate; then removing the organic matter on the surface of the obtained dry powder to obtain super-small metal ion doped hafnium oxide, i.e. the super-small nanometer radiotherapy sensitizer.

The invention relates to the technical field of lithium ion batteries, in particular to a metal ion doped lithium iron manganese phosphate positive electrode material and a preparation method thereof, which are used for solving the problems of poor electrochemical performance and cycling stability of the existing lithium iron manganese phosphate positive electrode material. According to the preparation method, the electrochemical performance, the cycle performance and the conductivity of the lithium manganese iron phosphate are optimized by doping metal ions niobium-titanium into the lithium manganese iron phosphate, and Nb < 5 + > and Ti < 4 + > cooperate with each other, so that the structural stability and the cycle stability of the material can be effectively improved, the ion migration resistance is reduced, the ion migration capability of the material is enhanced, and the conductivity of the material is improved; the coating of the modified graphene can promote the diffusion of Li < + > in the electrode, improve the rate capability and improve the cycle performance, and the exposure of the crystal face and the fluorine-doped coating of carbon enhance the electrochemical performance of the lithium manganese iron phosphate by accelerating the diffusion of Li < + > and electron transmission.