108results about How to "Doping achieved" patented technology

The invention relates to the field of graphene electrode materials, and in particular relates to a doped graphene electrode material, a macro preparation method as well as an application of the doped graphene electrode material in a high-capacity high-multiplying-power lithium ion battery. In the invention, graphene is taken as a raw material. The preparation method comprises the following steps: controlling the temperature rising speed rate through shielding gas; introducing gas containing nitrogen or boron elements in different concentrations at high temperature so as to realize the doping of heteroatoms of the graphene, and get the nitrogen or boron doped graphene; mixing the doped graphene, conductive carbon black and a bonding agent; adding a solvent; coating the mixture on a current collector after grinding; taking the mixture after drying, shearing and tabletting as a working electrode; adding electrolyte containing a lithium salt by taking a lithium plate as a counter electrode /reference electrode; assembling into a button-type lithium ion half-battery in a glove box; and carrying out constant current charge and discharge tests under the condition of high current density. According to the invention, the electrode stability of the material under the condition of high current density is improved, and the fact that the doped graphene has higher specific capacity and excellent cycle performance in a shorter time is realized.

The invention provides a bismuth oxyhalide light-emitting material with doped rare earth ions and a preparation method of the bismuth oxyhalide light-emitting material with the doped rare earth ions. The chemical formula of the bismuth oxyhalide light-emitting material with the doped rare earth ions is Bil-x-yEuxReyOM, wherein the x is 0.001-0.5, the y is 0-0.5, the M is one or more of Cl, Br and I, and the Re is any one or more of Tb, Ce, Nd, Dy, Sm, Pr, Lu, Er, Tm, Yb, Gd, Ho and La. The preparation method of the bismuth oxyhalide light-emitting material with the doped rare earth ions comprises the steps that (1) bismuth nitrate, rare earth nitrate and halogenated potassium are weighed, and a solution is prepared; (2) thermal treatment is carried out on the obtained solution to obtain produced materials, washing is carried out, thermal treatment is carried out again, and the bismuth oxyhalide light-emitting material with the doped rare earth ions can be obtained, wherein the chemical formula of the bismuth oxyhalide light-emitting material with the doped rare earth ions is Bil-x-yEuxReyOM. The bismuth oxyhalide light-emitting material with the doped rare earth ions can effectively achieve doping, has the good light-emitting characteristic, and is high in absorption efficiency and excitation efficiency to ultraviolet light and light of the visible light waveband, simple in preparation method, easy to control, low in cost of raw materials and low in resultant temperature of the high-temperature solid state method.

The invention relates to a method for realizing controlled doping of nano silicon quantum dots, which belongs to the technical field of nano photoelectronic devices. The method comprises the steps of preparing a doped amorphous silicon film, preparing a doped amorphous silicon multilayer film, preparing doped nano silicon quantum dots in virtue of laser radiation, and the like. The invention provides a preparation method for convenient, rapid and effective controlled doping of the nano silicon quantum dots, and the method has short processing time, does not damage a film and a substrate in a nanosecond level, and is compatible with the current micro-electronics processing technology. In the implementation process, the method mainly adopts a high-energy laser to irradiate the surface of the film to obtain the nano silicon quantum dots with uniform size, simultaneously realize the controlled doping of impurity concentration and improve the photoelectric property of the film. The doped nano silicon quantum dots prepared by the method have wide application prospect in the fields of future nanoelectronics, nano photoelectronic devices and the like.

The invention discloses an Er<3+>/Yb<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+>/Yb<3+> co-doped monocrystal; the molecular formula is LiY(1-x-y)ErxYbyF4, wherein x is greater than or equal to 0.008 and less than or equal to 0.085, and y is greater than or equal to 0.002 and less than or equal to 0.170; the segregation coefficients of Yb<3+> and Er<3+> in the yttrium lithium fluoride are about 1, and efficient intermediate infrared laser of 2.7 microns can be output; and the yttrium lithium fluoride monocrystal has high transmittance of intermediate infrared laser, has better thermal, mechanical and chemical stabilities than those of glass state materials and has the characteristics of low phonon energy, high optical transmittance of wavebands with width of 300-5500nm, less color center forming amount, low thermal lens effect and the like, thereby being more easily processed and more suitably used in laser devices. In the preparation method disclosed by the invention, a sealing crucible falling technology is used, so that the operation is simple; the raw material is fluorated at high temperature in a sealed water-free and oxygen-free environment, so that the crystal is isolated from air and water vapor during the growth; and therefore, the high-quality Er<3+>/Yb<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

Aluminum magnesium acid indium fluorescence undercoat is a mixture of a rare earth ionic or transition-metal ionic. The fluorescence undercoat is made of mixing aluminum magnesium acid scandium host crystal with rare earth ionic instead of scandium ionic or transition-metal ionic instead of aluminum or magnesium ionic. The ways of making the fluorescence undercoat can be divided into five methods: pull method, temperature gradient method, crucible fall method, heat change method or floating-zone method. The advantages of making white glowing diode by the fluorescence undercoat are: increases the stability of radiant capacity of the components, simplifies the making article of the white glowing diode, decreases the cost and increases the glowing efficiency of white glowing diode.

The invention relates to a method for preparing a manganese-doped regeneration lithium iron phosphate positive electrode material. The method includes steps of 1), calcining waste lithium iron phosphate battery positive electrode materials, then stripping the lithium iron phosphate battery positive electrode materials from positive electrode current collectors, and sieving the lithium iron phosphate battery positive electrode materials to obtain waste positive electrode materials; 2), supplementarily adding lithium sources, iron sources, manganese sources and phosphorus sources into the wastepositive electrode materials according to the contents of elements in the waste positive electrode materials to allow a final molar ratio of the lithium sources to the iron sources to the manganese sources to the phosphorus sources to be 1.05:(0.9-0.99):(0.01-0.1):1, adding carbon sources into the waste positive electrode materials according to 1-25% of theoretical lithium iron phosphate output mass, carrying out wet ball-milling to obtain uniform mixtures; 3), calcining the uniform mixtures under the protection of inert atmosphere at the temperatures of 600-750 DEG C for 2-10 hours to obtainthe manganese-doped regeneration lithium iron phosphate positive electrode material. The method has the advantages that the method is simple in process and easy to scale up, the manganese-doped regeneration lithium iron phosphate positive electrode material prepared by the method is narrow in particle size distribution, good in electric conductivity, high in specific capacity, stable in cycle andexcellent in rate capability, and the method is suitable for industrially recycling waste lithium iron phosphate battery positive electrode materials on a large scale.

The invention discloses a magnetic alpha-Fe2O<3-[delta]>C<[delta]>/FeVO<4-x+[delta]>C<x-[delta]> heterojunction photocatalyst, a preparation method and applications thereof. The preparation method comprises the following steps: taking FeCl3.6H2O as the iron source and NH4VO3 as the vanadium source, evenly stirring, adjusting the pH to 7.5-8.5, adding glucose to obtain a precursor solution; subjecting the precursor solution to a hydrothermal reaction, and burning the reaction product so as to obtain the magnetic alpha-Fe2O<3-[delta]>C<[delta]>/FeVO<4-x+[delta]>C<x-[delta]> heterojunction photocatalyst. In the provided preparation method, the C element in glucose is doped into the crystal lattices of FeVO4 and Fe2O3, thus the controllable change of relative contents of C element in the two phases can be achieved; the electron-cavity separation rate, photocatalytic efficiency, and application stability of the photocatalyst are effectively improved; at the same time, the magnetic performance of the heterojunction photocatalyst is improved in a certain degree, and thus the magnetic recovery of the photocatalyst becomes more easier.

The invention provides a multi-doped graphene composite nano material and a preparation method and application thereof. The method comprises the steps that dispersion liquid of graphene oxide, urea, pyrophosphate and silicon dispersion liquid, a selenium hydrazine hydrate dispersion liquid, a sodium molybdate saturated aqueous solution and the like serve as raw materials to realize multi-doping ofnitrogen, phosphorus, silicon and molybdenum selenide to graphene, and the obtained multi-doped graphene composite nano material can improve the reaction dynamics of carbon, provides more active sites for energy storage, has excellent visible light absorption performance, can fully utilize sunlight to carry out photocatalytic degradation on environmental pollutants, and has good photocatalytic performance. After heteroatoms are doped, the reactivity of the graphene oxide or the graphene is improved, so that further doping of the residual heteroatoms is facilitated; moreover, the interaction among the heteroatoms further improves the doping stability.

The invention discloses a preparation method of a porous nitrogen-doped graphene/carbon nanotube composite conductive agent. The preparation method comprises the steps of inoculating phanerochaete chrysosporium into a seed expansion culture solution for aerobic culture to obtain a seed liquid; adding the seed liquid and a graphene suspension liquid into a nutrition limitation culture solution, and dispersing the product subjected to constant-temperature shaking culture and processing in deionized water to obtain a nanopore graphene oxide suspension liquid; mixing the product and a carbon nanotube suspension liquid, performing ultrasonic processing, adding the mixed suspension liquid to an anaerobic denitrifying bacteria culture solution, and inoculating denitrifying bacteria seed liquid for anaerobic culture to obtain the porous nitrogen-doped graphene/carbon nanotube composite conductive agent. A two-step green preparation method is employed, a toxic reagent is not used, the preparation method has the advantages of moderate and controllable reaction process and low cost, and is easy to promote, and the prepared porous nitrogen-doped graphene/carbon nanotube composite conductive agent can be widely applied into the fields of a lithium ion battery and the like.

The invention discloses a preparation method of a lithium and nitrogen co-doped diamond film. The preparation method comprises the following steps: coating a layer of suspension liquid containing a lithium source on the surface of a substrate on which a diamond film is pre-deposited; after drying, putting into a reaction chamber of a heater chemical vapor deposition system, heating in a hydrogen atmosphere to melt powder containing the lithium source and allowing lithium to be dispersed in diamond; subsequently further depositing the lithium and nitrogen co-doped diamond film in a nitrogen-containing atmosphere by adopting a heater chemical vapor deposition method. The lithium and nitrogen co-doped diamond film has low surface work function, is liable to emit electrons under the effect of heat and the effect of an electric field, and can be applied to thermo-electron energy transforming components and field emission display components.

The invention discloses a method for rapid solvent-free preparation of heteroatom-doped graphitized carbon with high specific surface area. The method comprises the following steps: carrying out grinding and mixing on organic sulfonate and/or organic phosphonate and oxygen-containing organic polymer; then putting a mixture in protective atmosphere, and carbonizing at high temperature; washing and drying a carbonized product to obtain the heteroatom-doped graphitized carbon with the high specific surface area and mesopore and micropore structures. The method has the advantages of simple operation, no need of solvent, high yield and controllable heteroatom content; in addition, the production cost is greatly reduced, and industrial production is facilitated.

The invention relates to a preparation method of nitrogen-sulfur co-doped porous graphene by means of a supramolecular template method. According to the preparation method of the nitrogen-sulfur co-doped porous graphene by means of the supramolecular template method, graphene oxide is used as a raw material, a complex of the graphene oxide and melamine trimeric thiocyanate is obtained through supramolecular polymerization between the melamine and the trimeric thiocyanate, then the melamine trimeric thiocyanate is removed by calcination, and the nitrogen-sulfur co-doped porous graphene is prepared. According to the preparation method of the nitrogen-sulfur co-doped porous graphene by means of the supramolecular template method, compared with the prior art, a pore-forming agent or template agent is not needed to be introduced additionally, heteroatom precursors involved are all cheap industrial raw materials, so that the advantages of simple operation, low production cost and the like are achieved, the porous graphene is obtained, while nitrogen-sulfur co-doping is further achieved, and the obtained nitrogen-sulfur co-doped porous graphene has excellent electrochemical properties.

The invention discloses a preparation method of a sharpened monocrystal high-voltage spinel lithium nickel manganese oxide cathode material. The preparation method comprises the steps that (1) a lithium source, a nickel source, a manganese source, dopants, a fluxing agent and organic acid are mixed evenly; (2) a heating furnace is heated up to 80-300 DEG C and subjected to heat preservation, thena mixed material obtained in the step (1) is put into the heating furnace to be subjected to heat preservation for 0.5-30 h at the temperature, and a low-temperature eutectic mixture is formed; and (3) the low-temperature eutectic mixture obtained in the step (2) is placed into the heating furnace at the preset temperature of 300-700 DEG C to be heated and ignited, then sintered and naturally cooled with the furnace, and thus the sharpened monocrystal high-voltage spinel lithium nickel manganese oxide cathode material is obtained. The preparation method is simple in process, high in efficiencyand low in equipment requirement, the raw material mixing level of a liquid phase combustion method can be reached, raw material splashing in the liquid phase combustion method ignition process is further avoided, and large-scale production is easy to realize.

The invention discloses a negative electrode lead plaster of a lead-acid storage battery. The negative electrode lead plaster comprises the following components: lead powder, short fibers, lignin, humic acid, barium sulfate, barium-doped carbon nitride, a carbon material, purified water and dilute sulfuric acid in a mass addition ratio of 100:(0.05-0.5):(0-1.0):(0-1.0):(0-2.0):(0.1-1.0):(0-1.0):(10-15):(6-10). A barium-doped carbon nitride additive is added into the negative electrode lead plaster, so that the sulfation of the negative electrode plate is avoided, and the effect of prolonging the service life of the lead-acid battery is achieved; and the negative plate prepared by the method has higher partial charge state cycle life and static charging acceptance than a common negative plate.

The invention discloses a titanium tantalate-based photocatalyst doped with niobium and vanadium as well as a preparation method and application of the titanium tantalate-based photocatalyst, and belongs to the field of inorganic photocatalytic materials. According to the stoichiometric ratio of TiTa18-x-yNbxVyO47, wherein x and y are respectively the molar volumes of Nb<5+> doped and substitutedTa and V<5+> doped and substituted Ta, x is 0.1 to 5.4 and y is 0.1 to 2, raw materials containing Ti<4+>, Nb<5+>, Ta<5+> and V<5+> are weighed, a proper amount of a compound containing Li<+> ions isweighed as a sintering aid, and the pure phase titanium tantalate-based photocatalyst doped with niobium and vanadium is obtained by adopting a stepped sintering process. According to the invention, the titanium tantalate-based photocatalyst is obtained by doping the Nb with the V and the absorption in a visible light range is enhanced; meanwhile, lattice disturbance greatly improves the separation efficiency of photo-induced charge and enhances the photocatalytic ability. The titanium tantalate-based photocatalyst doped with niobium and vanadium is simple in preparation technology, low in cost, good in stability of photocatalytic materials, and capable of degrading organic pollutants under the irradiation of ultraviolet light and near ultraviolet light, and especially degrading the organic pollutants in water, thereby facilitating environmental protection.

The invention discloses sisal-based nitrogen and phosphorus co-doped activated carbon, and further discloses a preparation method of the sisal-based nitrogen and phosphorus co-doped activated carbon.The method comprises the following steps: sequentially subjecting sisal fibers to impregnating, drying, carbonizing, activating, washing and drying in a mixed solution to obtain the sisal-based nitrogen and phosphorus co-doped activated carbon. The mixed solution is prepared by adding potassium hydroxide, a hydrogen peroxide solution, urea and potassium phosphate into deionized water. The invention further provides application of the sisal-based nitrogen and phosphorus co-doped activated carbon. The sisal fibers are treated by a one-step method, so that the sisal-based nitrogen-phosphorus co-doped activated carbon prepared from the sisal fibers is of a hierarchical porous structure and has a reasonable specific surface area and excellent electrical properties.

The invention provides a method for preparing silicon-based rare earth adulterated luminescent material and is characterized in that: the method comprises the following steps: step 1: silicon-based underlay material, or film on silicon-based underlay material is taken; step 2: A layer of silicon-based film including impurity is prepared on the underlay material or the film on the silicon-based underlay material through ion injection or deposition method; step 3: The silicon-based film material on the silicon-based material is crystallized by way of annealing and compound quantum dots containing impurity element are prepared at the same time; step 4: the rare earth ions are adulterated by way of ion injection; step 5: the rare earth ions are activated by way of annealing.

The invention provides a lithium cobalt oxide positive electrode material and a preparation method thereof, the preparation method is characterized in that three elements Ba, Ga and Ru with different modification action mechanisms are doped into a lithium cobalt oxide lattice, and the barium element realizes the purpose of reducing a Li < + > diffusion energy barrier by adjusting a geometric structure and an electronic structure of lithium cobalt oxide; the gallium element plays a role in stabilizing the lattice structure of the lithium cobalt oxide through high binding energy with oxygen; the ruthenium element plays a role in inhibiting charge compensation behavior of oxygen in lithium cobalt oxide under high voltage and irreversible phase change under 4.55 V by reducing an energy level overlapping region of a 3d track of cobalt and a 2p track of oxygen, and under the action of three different regulation mechanisms, the capacity, the cycling stability and the rate capability of the lithium cobalt oxide positive electrode material under high voltage are improved, and meanwhile, the lithium cobalt oxide positive electrode material has wider practical applicability in the aspect of electrochemical energy storage due to the good electrochemical charge-discharge behavior of the lithium cobalt oxide positive electrode material.

The invention relates to a preparation method of a moisture-proof and efficient ozone decomposition agent, the preparation method comprises the step of synchronously carrying out transition metal ion doping and manganese dioxide high-activity crystalline phase conversion, and specifically comprises the following steps: adding a framework material in a process of synthesizing manganese dioxide by a hydrothermal method to obtain a mesoporous manganese dioxide material with a low particle size and a high specific surface area, realizing transition metal ion co-catalyst doping and conversion from a low catalytic activity crystal phase to a high catalytic activity crystal phase of manganese dioxide through a post-treatment reaction, and performing the conventional granulation process on the obtained ozone destroying active component to finally obtain the high-environment-humidity-resistant mesoporous ozone destroying agent. The agent has the advantages that the operation is simple, additional heating is not needed, ozone tail gas is efficiently degraded at low temperature, the cost is low, and excellent catalytic performance can still be kept in a high-humidity environment.

The invention discloses a nitrogen-doped carbon layer-coated cobalt oxide nanosheet and a preparation method and energy storage application thereof. The preparation method comprises the following steps: thermally synthesizing a cobalt oxide nanosheet precursor through a solvent, and then loading a polyvinylpyrrolidone coating layer which is simultaneously used as a nitrogen source and a carbon source on the surface of the cobalt oxide nanosheet precursor; finally, carrying out high-temperature calcination under the protection of an argon atmosphere, and fully utilizing in-situ carbonization and decomposition of polyvinylpyrrolidone to obtain the cobalt oxide nanosheet coated with the nitrogen-doped carbon layer. The material is simple in preparation method, low in cost, easy to control in process and capable of being produced in batches; and when the cobalt oxide nanosheet coated with the nitrogen-doped carbon layer prepared by the invention is used as a lithium ion battery negative electrode material, the cobalt oxide nanosheet has excellent specific capacity and rate capability.