332 results about "Metal ion doping" patented technology

The invention discloses a lithium titanate-carbon composite nano-material, a preparation method thereof and application thereof. The method comprises the following steps: 1) statically spinning lithium titanate sol, or lithium titanate sol doped with a conductive substance or lithium titanate sol doped with metal ions to obtain a thin film, wherein the conductive substance is conductive metal or conductive carbon; and 2) heat treating the thin film in inert atmosphere to obtain the lithium titanate-carbon composite nano-material. The lithium titanate-carbon composite nano-material provided by the invention has a standard one-dimensional morphological structure, high crystallinity, high conductivity and high safety performance, and has high lithium ion diffusion speed and high electronic conductivity when applied as the cathode material of the lithium ion battery. Moreover, the lithium titanate-carbon composite nano-material has high charge/discharge capacity, excellent high-current charge/discharge performance and stable cycling performance. The 10c charge/discharge capacity is 125mAh/g, the 40C charge/discharge capacity reaches 95mAh/g, and the retention rate of the high-current 40C charge/discharge capacity within 3000 times reaches 85 percent.

This invention relates to a method for preparing olivine-type phosphate-series lithium ion battery anode material. The method comprises: mixing one or more of ferrous salt solution, cobalt salt solution and manganese salt solution with oxalic acid or oxalate (precipitating agent) aqueous solution to obtain composite oxalate precursor, uniformly mixing with lithium source and phosphorus source by ball milling, and reacting in inert or weak-reductive atmosphere to obtain olivine-type phosphate-series lithium ion battery anode material. The method utilizes co-precipitation method for metal ion doping, and realizes molecular level uniform mixing among different ions. The obtained olivine-type phosphate-series lithium ion battery anode material has uniform chemical and physical compositions. The average particle size can be controlled within 0.3-10 mu.m. The first charge and discharge cycle specific capacity can reach 150 mAh/g at 0.1 C rate and room temperature. The livine-type phosphate-series lithium ion battery anode material has such advantages as high cycle performance and high charge/discharge performance.

The present invention relates to a transition metal-doped carbon fluorescent quantum dot preparation method, which comprises: dissolving a metal chelating agent and a transition metal salt in an organic solvent, carrying out a solvothermal reaction, and carrying out concentration purification after the reaction to prepare the transition metal-doped carbon fluorescent quantum dots having good water solubility. According to the present invention, the operation of the method is simple, the metal ion doping on the carbon fluorescent quantum dots can be achieved without harsh reaction conditions or large instruments, such that the characteristic that the long wavelength fluorescence emission is not easily achieved by the general carbon dots can be achieved; the obtained carbon fluorescent quantum dots have characteristics of good water solubility, wide fluorescence emission range, and maximum emission wavelength change along with concretion change; and with the characteristics of the preparation method, the prepared transition metal-doped carbon fluorescent quantum dots provide great application values in the fields of biological labeling sensing and medical imaging, photoelectricity, light-emitting device preparation, and the like.

Provided are a resistance random access memory including a resistance layer having a metal oxide and/or a metal ion dopant, which may be deposited at room temperature and which may have variable resistance characteristics, and a method of manufacturing the same.

The invention relates to a battery anode material and discloses a metal ion doping and carbon coating jointly modified lithium ion battery anode material, which comprises a lithium iron phosphate anode substrate synthesized by using LiOH.H2O and FePO4.4H2O, and is characterized in that: the lithium iron phosphate anode substrate contains at least one metal ion which may be Mn<2+>, Ni<2+>, Co<3+>, Cu<2+>, Zn<2+>, Zr<4+>, Al<3+>, Sn<4+>, Nb<5+>, Mg<2+> or Ti<4+>; and the surface of the lithium iron phosphate anode substrate is uniformly coated with carbon. In the lithium ion battery anode material, the metal ion is doped at the lithium position to produce a lithium ion vacancy in the crystal lattice of the lithium iron phosphate, so the electron conductivity and ionic diffusion coefficient of the lithium ion battery anode material are improved and the discharge capacity and the circulation stability of the lithium ion battery anode material are improved. The method for manufacturing metal ion doping and carbon coating jointly modified lithium ion battery anode material is simple, easy to implement, obvious in effect and low in cost.

The invention belongs to the technical field of lithium ion batteries, in particular to a preparation method of a composite solid electrolyte separator, comprising the following steps: 1) coating thesurface of a solid electrolyte powder with a metal oxide layer by an atomic layer deposition method; 2) hot pressing the solid electrolyte powder coated with metal oxide layer at 200-1400 DEG C and cooling to room temperature to obtain the composite solid electrolyte membrane. The invention also provides a composite solid electrolyte membrane prepared by adopting the preparation method. The invention also provides a lithium ion battery, comprising a positive electrode, a negative electrode and a composite solid electrolyte separator between the positive electrode and the negative electrode. Bycoating the surface of the solid electrolyte with the metal oxide, the invention can prevent the metal oxide from reacting with air or water, can also be doped and used as a high-temperature sintering auxiliary agent, which is favorable for lowering the sintering temperature, shortening the sintering time, improving the density, and the metal ion doping is favorable for improving the ionic conductivity.

The invention relates to a class of titanium dioxide photocatalysts, in particular to a low-temperature preparation method of visible light-responsive titanium dioxide transparent aqueous sol doped with metal ions. The titanium inorganic salt and the metal inorganic salt as a dopant are dissolved in water together to form a mixed solution; wherein, the molar ratio of the metal ion in the metal inorganic salt as a dopant to the titanium ion in the titanium inorganic salt is 0.001~ 0.2; then dropwise add inorganic lye until the pH of the mixed solution is about 7-11 to obtain a composite titanic acid precipitate, wash the composite titanic acid precipitate with water and filter, then disperse with hydrogen peroxide aqueous solution, at a temperature of 50-100 Heating at ℃ for 1-24 hours to obtain a transparent aqueous sol of titanium dioxide doped with metal ions. The low-temperature preparation method of the metal ion-doped titanium dioxide transparent water-based sol avoids the problem of environmental pollution, and the obtained sol is transparent, neutral and water-based, and has good photocatalytic effect under visible light.

The invention relates to a synergistically modified lithium-iron-phosphate positive active material enveloped with a graphene three-dimensional network and doped with metal ions and a preparation method of the lithium-iron-phosphate positive active material. The preparation method comprises the following steps of: dispersing graphene or graphene oxide together with lithium iron phosphate doped with the metal ions into a solution, mixing uniformly by agitation and ultrasound, drying to obtain a lithium iron phosphate material compounded with graphene or graphene oxide and doped with the metal ions, and then annealing at high temperature to obtain the synergistically modified lithium-iron-phosphate positive active material enveloped with the graphene three-dimensional network and doped with the metal ions. Compared with a traditional modified lithium battery enveloped with carbon and doped with conductive macromolecules, a lithium-ion secondary battery adopting the positive active material has the characteristics that the battery capacity is high, the charging and discharging cycle performance is excellent, the service life is long, the cycle stability is good, and the industrial application value is extremely great.

The present invention belongs to the technological field of a high energy battery, in particular to the technological field of an anode material used by a synthetic lithium ion battery. The present invention relates to a method of synthesizing a lithium iron (11) phosphate or modifying the lithium iron (11) phosphate by a chemical reaction in a microwave oven. The present invention is characterized in that adopting an atmoseal to protect the isolated air overcomes the disadvantage that a reducer can remain in the production when a solid-phase reducing agent is added directly to synthesize the lithium iron (11) phosphate material. The lithium iron (11) phosphate LiFePO4 can be synthesized and the lithium iron (11) phosphate can be modified LiFe1-xMxPO4 (M is equal to La, Co, Ni, Mn, Cr, Cu, Nd, Pr, Gd, C, Ce, Mo; x is more than or equal to 0 and less than or equal to 1) by combining the microwave synthesis with a so-gel, a coprecipitation and a hydrothermal synthesis and adopting a metal doping, a metal ion doping, a carbon doping and others.

The invention discloses a titanate nanotube composite type photocatalyst as well as a preparation method and application thereof. A metal ion doped titanate nanotube photocatalyst with the one-dimensiional tubular structure is obtained by using anatase TiO2 and metal ion acetate as raw materials through hydrothermal and an ion exchange method; in addition, the CdS/titanate nanotube composite type photocatalyst with the one-dimensiional tubular structure is obtained by using the anatase TiO2, Cd(NO3)2.4H2O and thioacetamide as raw materials through one-step hydrothermal. The titanate nanotube composite type photocatalyst is used for the photocatalytic selective oxidation of alcohols for the first time and has high catalytic efficiency. The titanate nanotube composite type photocatalyst is simple to prepare, is used for the selective oxidation of the alcohols by using visible light as driving energy and oxygen as an oxidizing agent and is beneficial to the sustainable development of environments and energy sources.

The invention relates to a method for synthesizing manganese phosphate lithium sol-gel doped with other metal ions. The method comprises the following steps: (1) dissolving a lithium source compound, a manganese source compound, a metal ion compound, a carbon source compound, a phosphorus source compound and a complexing agent in deionized water, wherein the molar ratio of the complexing agent to the lithium source compound is 0.5-2.5; (2) stirring a settled solution strongly and evaporating the solution until a viscous substance is obtained, and performing drying and ball milling on the viscous substance in a blasting drying box to obtain a mixed powder; and (3) transferring the mixed powder into a ceramic boat, and performing calcinations under the atmosphere of indifferent gas under the temperature of 500-800 DEG C for 1-24 hours to obtain a manganese phosphate lithium product doped with other metal ions. The method provided by the invention has the advantgages of improving the electric conductivity of materials effectively and largely improving the cycle performance of materials, has also the advantages of good evenness of the synthesized manganese phosphate lithium sol-gel doped with the other metal ions, low production cost, simple operation and easiness to realize commercialized production.

The metal ion mixed with TiO2 transparent optical catalyst lotion features in 0. 5-10% TiO2, mixed with V, Tin, Zn, Fe, OP emulsifier 1-10% with the rest being water, comprising a making of titanic chloride water solution, hydrolysis to generate TiO2+, VO3+, Sn4+, Zn2+, Fe3+ or Ce3+ compound oxidation deposit, low temperature complexing, hydrolysis to get the metal mixed nanometer TiO2 transparent catalyst lotion. It uses cheap titanium tetrachloride and ammonium vanadate, white copperas, Fe2cl3,tin tetrachloride as the inorganic material, using low temperature complex hydrolysis to allow higher ability to mix, expanding spectral response zone. Its maximum advantage is the direct use of sun light or fluorescent lamp, realizing complete degradation of organic pollutants, improving the speed and efficiency of photochemical catalysis and degradation for environmental purification.

The invention discloses composite lithium manganese phosphate serving as a lithium ion battery anode material. The composite lithium manganese phosphate serving as the lithium ion battery anode material comprises lithium manganese phosphate matrix, metal ions are doped into the lithium manganese phosphate matrix, the adding amount of the metal ions is 0.001 to 0.2 times stoichiometric ratio of the lithium manganese phosphate matrix, Ti3SiC2 is doped and coated outside the lithium manganese phosphate matrix, the coating amount of the Ti3SiC2 is 0.1 to 30 percent of the mass of the matrix, the specific surface area of the composite lithium manganese phosphate is 3 to 50 m<2>/g, and the tap density is 0.9 to 1.8 g/cm<3>. The invention also provides a preparation method of the composite lithium manganese phosphate and a lithium ion battery using the composite lithium manganese phosphate as the anode material.

The invention relates to a preparation technique of a doped photocatalyst of mesoporous nanocrystalline titanium oxide, in particular to a method of preparing non-metallic ion-doped photocatalyst of mesoporous nanocrystalline titanium oxide by two hydrothermal processes. By adopting the invention, mesoporous structured nanocrystalline titanium oxide doped with non-metallic elements can be acquired; a preparation method of doping (nitrogen-doping and iodine-doping) and effectively combing the non-metallic elements with mesoporous structure is adopted, which is characterized in that proper dopant is selected and two hydrothermal processes are carried out: seed crystal of titanium oxide is acquired in the first hydrothermal process and added with the dopant; seed crystal acquired in the first hydrothermal process is utilized. The mesoporous structure can be obtained through self assembly, and then the mesoporous structured nanocrystalline titanium oxide doped with non-metallic elements is acquired. The photocatalyst thus prepared has the advantages of a big-ratio superficial area, small grain size, and high visible absorption, etc., and as the mesoporous structure constructed by nanocrystalline particles has good auto-deposition effect, the invention can hopefully be applied in water processing.

The invention discloses a method for realizing metal ion doping and metal oxide surface coating to modify a ternary cathode material jointly by a one-step method, which comprises the following steps:S1. mixing a complexing agent and a ternary cathode material to be dissolved in a solvent, and continuing stirring reaction after ultrasonic wave treatment; 2, adding a metal ion salt solution to be doped and coated into the mixed solution in S1 drop by drop under the stirring state, and continuing stirring e reaction; S3, heating the mixed solution in S2, continuing stirring until the solvent iscompletely volatilized to obtain a mixed powder body; S4, calcinating the powder body obtained in S3 at 400-600 DEG C for 4-6h, and cooling to room temperature to obtain the modified material. The invention adopts a simple process and a method assisted by a complexing agent to prepare a modified ternary cathode material doped with elements on the surface layer and coated on the surface layer of the material in one step. Doping effectively inhibits the crystal structure transformation of the surface layer of the material during the cycle, and the coating layer prevents the direct contact with the electrolyte, inhibits the occurrence of side reactions, and improves the cycling stability of the material. By optimizing the synthesis process, the cost can be effectively saved, and the method has great application prospects.

The invention discloses a preparation method of a sulfide-graphene composite material photoelectric catalyst. The preparation method comprises the following steps: first, dispersing graphene oxide powder in water to obtain a graphene oxide dispersion liquid; then, adding soluble metal salt into the dispersion liquid, stewing the liquid, washing precipitates, and drying and grinding the precipitates to obtain metal ion-doped graphene oxide powder; dispersing the powder into deionized water again, stirring the powder, adding a sulfide precursor salt solution, adding thiourea, stirring the materials, obtaining a reaction product according to a one-step hydrothermal method, naturally cooling the product to room temperature, centrifugally washing the reaction product, and drying the product toobtain solid powder. The preparation method of a sulfide/graphene compound is simple; metal ions are used as an interface connection agent for sulfide and the surface of the graphene and a seed layerfor sulfide growth, so that uniform dispersion of a sulfide sheet layer is promoted, and stacking of the sulfide sheet layer is inhibited; a large specific surface area can provide a plurality of active sites, so that the catalysis performance of a composite material is effectively improved.

The invention discloses a preparation method for a lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material. The preparation method comprises the following steps: (1) preparing a V(1-m)MmPO4/C precursor pre-coated with carbon and mingled with metal ions by a carbon thermal reduction method, wherein the M is Cr<3+>, Al<3+>, Y<3+> and Fe<3+>; (2) performing mixed dispersion on the obtained V(1-m)MmPO4/C precursor and dispersion serosity in which a lithium source, a fluorine source, a phosphorus source and grapheme (FLG) are in a stoichiometric proportion under an alcohol system so as to obtain mixed pulp; (3) after performing drying treatment on the obtained mixed pulp, performing high-temperature sintering treatment under the protection of inert gas so as to obtain the lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material mingled with the metal ions and jointly modified by the graphene and cracking carbon. According to the invention, the technology is simple, and the obtained lithium vanadium phosphate and fluorination lithium vanadium phosphate composite positive pole material has excellent multiplying power, an excellent cycle performance and a wide application prospect in the field of lithium ion batteries.

The invention relates to a CdS buffer layer of a film solar battery and a preparation method. A cadmium-containing compound and a sulfur-containing compound carry out a chemical reaction, a compound or a solution containing metal ions is added into the reaction, the metal ions are doped, and a CdxM[1-x]S film is prepared and is used as the buffer layer material of a copper-indium-gallium-selenium(CIGS) series film solar battery. On the one hand, the invention reduces the use quantity of Cd in the material, reduces the problem of metal pollution of cadmium and is beneficial to environmental protection; on the other hand, the invention can effectively regulate the bandgap of the buffer layer material by doping, thereby enhancing the photoelectric conversion efficiency of the copper-indium-gallium-selenium series film solar battery.

The invention discloses a preparation method of a hydro-thermal coupling spray pyrolysis MnO2/graphene electrode material, belonging to the technical field of electrode materials for energy storage systems. The preparation method comprises the following steps: uniformly mixing graphene oxide (GO) prepared by using a Hummer method with an aqueous solution of bivalent manganese salt and a doped metal ion compound, adding a dispersing agent, an oxidant and a surfactant, and ultrasonically dispersing for a certain period of time; putting the mixed solution into a hydrothermal kettle, adjusting the temperature, and keeping for a certain period of time; filtering and washing a reaction product to obtain a precursor; adding the dispersing agent and the surfactant into the precursor, uniformly stirring for mixing, and adjusting the solid-liquid ratio, inlet temperature and outlet temperature to perform spray pyrolysis in order to obtain a metal ion-doped MnO2/graphene nanometer composite electrode material. According to the nanometer composite electrode material prepared by using the method, components are uniform and the batch stability is high.

The invention discloses a metal ion-doped titanium dioxide plate-type photocatalytic microreactor and a preparation method for catalyst thin films in the reactor. The reactor includes a stainless steel plate base; a groove on the stainless steel plate base is used as a single-channel reaction region; an inlet and an outlet respectively communicated with an inlet and an outlet of the single-channel reaction region are arranged on the stainless steel plate base, the inlet is communicated with an inlet pipeline, and the outlet is communicated with an outlet pipeline; one face, having the groove, of the stainless steel plate base and one face of a light-penetrating surface are each loaded with the metal ion-doped TiO2 catalyst thin film; the face, loaded with the catalyst thin film, of the light-penetrating surface is in opposite arrangement with the face, having the groove, of the stainless steel plate base, and has the periphery edges bonded and fixed by a sealing adhesive; an incident light source is arranged above the light-penetrating surface opposite to the groove. By using the device and the method, the light utilization efficiency is higher, and the degradation rate is increased to 2 times of the original degradation rate of an undoped TiO2 catalyst.

The invention relates to a preparation method of a titanium dioxide photocatalyst doped with metal ions. The preparation method comprises the following steps of: firstly, taking 20ml HNO3 solution and adding metal nitrate into the solution to obtain solution A; secondarily, putting the solution A on a magnetic stirrer for heating and stirring, when the solution volatiles to 15ml, dissolving tetrabutyl titanate into the solution A, continuously heating, stirring till TiO2 crystal doped with metal ions is obtained; finally, putting the TiO2 crystal doped with metal ions into a mortar for porphyrization, then sintering in a muffle furnace, naturally cooling the furnace to room temperature and obtaining the titanium dioxide photocatalyst doped with metal ions. The invention utilizes a uniform pyrohydrolysis method to prepare TiO2 doped with metal ions and prepares the needed raw materials into solution, leads the raw materials to be mixed uniformly on ion; and the obtained titanium dioxide photocatalyst doped with metal ions expands the absorption range to sunlight, improves photocatalytic activity and simultaneously enhances antibacterial effect.

The invention discloses a lithium ion battery layered positive electrode material doped with metal ions, and a preparation method thereof. The molecular general formula of the layered positive electrode material is Li1+aM1-a-xMexO2, wherein M is any one or more of Mn, Ni, Co, Al, Cr, Mg, Ca, Zr, Ti, Zn, and Fe, Me is any one or both of Sb and Bi, a is not less than 0 and not more than 1/3, and x is more than 0 and not more than 2/3. The preparation method comprises the following steps: respectively processing metal salt (M + Me + Li) and a precipitating agent to prepare organic solvent solutions with certain concentrations; and mixing the solutions, transferring the obtained mixed solution to a reaction kettle, carrying out a solvothermal reaction, filtering the obtained reaction product, drying the filtered reaction product, and sintering the dried reaction product to obtain the filtration, drying and sintering to obtain the lithium ion battery layered positive electrode material doped with metal ions. The lithium ion battery layered positive electrode material doped with the metal ions Sb and Bi can inhibit the voltage attenuation and increase the rate capacity, and is suitable for lithium ion batteries.