22results about How to "High phase purity" patented technology

The invention discloses a method for preparing high-purity uranium carbide microspheres by a microfluidic-assisted internal gelation process, which comprises the following steps of: designing a uranium glue solution component containing carbon black to obtain a uranium glue solution which is stable for a long time at room temperature and quickly gelates at high temperature; the preparation method comprises the following steps: preparing gel microspheres with uniform size by using a uranium glue solution as a micro-fluidic dispersion phase through a micro-fluidic assisted inner gel process; the pore structure in the gel microspheres is maintained through washing and soaking with propylene glycol monomethyl ether, so that the crack-free gel microspheres are obtained; the UC nuclear fuel microspheres which are uniform in size, good in sphericity degree and high in phase purity are prepared through the carbon thermal reduction reaction of the non-cracking gel microspheres under the optimized sintering schedule, and development of ultrahigh-temperature gas cooled reactor nuclear fuel is expected to be promoted.

The invention discloses a CCTO dielectric ceramic, and belongs to the technical field of dielectric ceramic synthesis. Calcium nitrate tetrahydrate, copper nitrate trihydrate, tetrabutyl titanate and niobium oxalate hydrate are used as raw materials, a precursor solution is prepared according to the molar ratio of calcium to copper to titanium to niobium being 1: 3: 4-x: x, the PH is adjusted, colloid obtained after aging is dried and ground, then high-temperature sintering is conducted in a muffle furnace, tabletting is conducted after the colloid is mixed with an adhesive, annealing is conducted, and finally the high-density, good-uniformity and high-temperature-resistant titanium-titanium alloy is obtained. And the single-doped CaCu3Ti (4-x) NbxO12 ceramic sample has the advantages of low dielectric loss and high dielectric constant.

The invention belongs to the technical field of sodium ion battery materials, and particularly relates to a method for preparing a mixed type phosphate sodium ion positive electrode material by using a chelating agent to assist transition metal salt. The preparation method comprises the following steps: preparing a phosphorus source, a sodium source and transition metal oxalate according to the stoichiometric ratio of a P element, a sodium element and an M element in Na4Mx (PO4) 2P2O7, then adding the phosphorus source, the sodium source and the transition metal oxalate together with a carbon source and a chelating agent into deionized water, uniformly mixing, grinding, collecting precursor powder, and sintering to obtain the mixed phosphate sodium ion positive electrode material. The transition metal oxalate is adopted, no impurity phase is introduced in the preparation process, the chelating agent is used for auxiliary preparation, the problem of non-uniform mixing of the raw materials is solved, the obtained mixed phosphate sodium ion positive electrode material has excellent cycle stability, and support is provided for industrial preparation of the sodium ion battery mixed phosphate positive electrode material.

The invention discloses a precursor for a polyanionic sodium ion battery positive electrode material and a preparation method of the precursor. The chemical general formula of the precursor is NaxMyHzOa (POb) c.mH2O, wherein M is a transition metal element Fe and / or Mn; the relationship among x, y, z, a, b and c is x + 3y + z-2a + 5c-2b * c = 0, and the value range of m is greater than or equal to 0. The precursor for the polyanionic sodium ion battery positive electrode material and the preparation method thereof have the characteristics of high phase purity, high compaction density, excellent electrochemical performance, low cost and wide system applicability.

The invention discloses a high-conductivity sodium ion battery positive electrode material / organic conductive polymer composite material and a preparation method thereof, and the preparation method comprises the following steps: S1, preparation of a chain product: adding water into an organic conductive polymer monomer for dissolving, adjusting the pH value of the solution to be acidic, adding an oxidizing agent, and stirring to obtain the chain product; inducing an organic conductive polymer monomer to generate a polymerization reaction to form a chain product; s2, preparation of precursor slurry: adding a sodium source, an iron source and a sulfur source into the solution for forming the chain product, and fully dissolving to form uniform precursor slurry; s3, preparation of precursor powder: drying the precursor slurry to realize solid-liquid separation so as to obtain dried precursor powder; and S4, high-temperature sintering: calcining the precursor powder in a protective atmosphere, and naturally cooling to obtain the Na < 2 + x > Fe < 2-x > (SO4) 3 / organic conductive polymer composite positive electrode material. The preparation method has the characteristics of high electronic conductivity, low specific surface area, high compaction density and excellent electrochemical performance.

The invention provides an oxygen-vacancy-rich Bi5O7I microsphere piezoelectric-photocatalyst and a preparation method thereof, and belongs to the technical field of light pressure concerted catalysis, and the preparation method comprises the following steps: mixing Bi (NO3) 35H2O and PEG 6000 powder, dissolving in absolute ethyl alcohol, uniformly stirring, dropwise adding a NaI solution, uniformly stirring again, sequentially washing and drying to obtain a dried product, and calcining the dried product to obtain the oxygen-vacancy-rich Bi5O7I microsphere piezoelectric-photocatalyst. The Bi5O7I microsphere piezoelectric-photocatalyst rich in oxygen vacancy is obtained; according to the invention, richer oxygen vacancies are introduced into the Bi5O7I powder, the spectral absorption range of the piezoelectric-photocatalyst is expanded, and the concentration of current carriers is improved by utilizing the capturing effect of the oxygen vacancies on electrons, so that the photocatalytic, piezoelectric catalytic and light-pressure synergistic catalytic efficiency of the piezoelectric-photocatalyst is improved; the oxygen-vacancy-enriched Bi5O7I microsphere piezoelectric-photocatalyst prepared by the preparation method disclosed by the invention has efficient organic dye degradation performance, and the catalytic effect of the oxygen-vacancy-enriched Bi5O7I microsphere piezoelectric-photocatalyst is far superior to that of pure-phase Bi5O7I powder.

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

The invention discloses a precursor for a high-compaction polyanionic sodium ion battery positive electrode material and a preparation method thereof, the chemical general formula of the precursor is MxPOy.mH2O, M is a transition metal element Fe and / or Mn, and the value range relation of x, y and m is 0.4 lt; xlt; y is equal to 3.5 / 3.75; m > = 0. The precursor for the high-compaction polyanionic sodium ion battery positive electrode material and the preparation method of the precursor have the characteristics of high compaction density, high phase purity, capability of meeting different system requirements, excellent electrochemical performance and low cost.

The invention discloses a method for preparing a multi-element carbide ceramic nanowire by a molten salt method. The multi-element carbide ceramic nanowire is prepared from the following raw materials: a carbon nanotube, potassium halide and IVB group metal powder, the method for preparing the multi-element carbide ceramic nanowire by the molten salt method comprises the following steps: mixing preparation raw materials and sintering. The preparation method is simple and feasible, and can be used for industrial production; in addition, the prepared multi-component carbide ceramic nanowire is high in phase purity and uniform in distribution.

The application discloses a preparation method of a polyanionic sodium ion battery positive electrode material, and comprises the following steps: S1, preparation of a precursor solution: a transition metal M source, an acid solution and a complexing agent are mixed and dissolved to form a precursor solution; S2, preparation of a pre-oxidized precursor solution: an oxidizing agent is added to the solution to generate a pre-oxidized precursor solution; S3, preparation of M(OH)x precipitation: a pH value of the pre-oxidized precursor solution is adjusted so that transition metal ions in the solution are precipitated in the form of M(OH)x; S4, preparation of a precursor powder: the M(OH)x precipitation, a sodium source, a phosphorus source and a carbon source are mixed wetly to obtain a precursor slurry; S5, drying of the precursor powder: the precursor slurry is dried and separated to obtain a dried precursor powder; and S6, high-temperature sintering: the precursor powder is sintered at a high temperature to obtain a polyanionic material. The polyanionic sodium ion battery positive electrode material has the characteristics of excellent electrochemical performance, high compaction density and low cost.

The invention relates to a preparation method of single-component rare earth fluorescent powder, which comprises the following steps of: mixing yttrium chloride, europium chloride and terbium chloride serving as rare earth raw materials in proportion, preparing a ligand solution, dripping the ligand solution into a rare earth mixed solution, and coprecipitating to obtain the rare earth fluorescent powder. The preparation method is easy and convenient to operate and simple in process, the obtained fluorescent powder is uniform in ligand structure, few in impurity, high in color purity and high in luminous efficiency, meanwhile, the proportion of rare earth raw materials can be adjusted according to actual requirements, fluorescent powder with different colors is obtained, and the color gamut of the product is wide. The method is an ideal method for preparing the rare earth fluorescent powder.

The invention belongs to the technical field of luminescent materials, and discloses green fluorescent powder as well as a preparation method and application thereof. The chemical formula of the green fluorescent powder is CaY (1-x) GaO4: xCe < 3 + >, and x is more than or equal to 0.02 and less than or equal to 0.2. Due to the specific composition, the green fluorescent powder disclosed by the invention not only can be used in the field of non-contact optical temperature measurement, but also can be used in the field of indoor illumination. When being applied to optical temperature measurement, the optical temperature sensor has the advantages of quick effect, high resolution, high sensitivity, high temperature resistance, no need of direct contact with an object and the like. And after being mixed with a blue light chip and commercial red fluorescent powder, the light-emitting material can be used as a warm white light LED device, and has the advantages of low cost and stable performance, and the obtained warm white light LED device has a good light-emitting effect.

The invention belongs to the technical field of neutron shielding materials, and particularly relates to a metal ceramic shielding material for shielding neutrons and gamma rays. The metal ceramic shielding material is a (WxMo1-x) AlB-MAB solid solution phase compound and has a monoclinic cubic crystal structure, and a unit cell of the metal ceramic shielding material is formed by alternately stacking MB units and A atom planes; the compound is composed of elements W, Mo, Al or 6061Al alloy and B, Mo is a solid solution atom of W at the M position, the atomic concentration x of Mo is 5-40 at%, and alloy elements Si and Mg atoms in the 6061Al alloy are mainly at the A position. The compound phase metal ceramic shielding material has extremely high W and B contents, and has excellent shielding characteristics for neutrons and g rays of various energy segments; moreover, the material has dual characteristics of metal and ceramic, namely, the material has good mechanical properties, excellent electric conduction and heat conduction properties and relatively high thermal stability and high-temperature oxidation resistance.

This invention proposes an ABX3 seed-induced crystallization perovskite thin film and a method for preparing the same for photovoltaic cells. The ABX3 seed-induced crystallization perovskite thin film contains potassium stannate. This ABX3 seed-induced crystallization perovskite thin film exhibits high crystallinity and good stability.

This invention discloses a method for preparing a composite polyanionic sodium-ion battery cathode material, relating to the field of sodium-ion battery cathode material technology, including the following steps: S1, preparing in-situ doped ferrous sulfate; S2, preparing a graphene-based dispersion; S3, preparing a modified ferrous sulfate solution; S4, preparing an NFPP precursor; S5, preparing an NFPP cathode material. This invention uses stainless steel pickling waste liquid as raw material, first reducing it by adding elemental iron, then dispersing it in a graphene-based dispersion containing tannic acid to obtain carbon-coated modified ferrous sulfate; preparing the NFPP precursor by co-precipitation; and finally sintering to obtain a composite polyanionic sodium-ion battery cathode material with high compaction density and better electrochemical performance, thus improving the problems of poor conductivity, low compaction, low capacity, low rate capability, and high cost of existing NFPP cathode materials.

The invention belongs to the field of magneto-optical film materials, and particularly relates to a high-phase-purity Ce-doped iron garnet magneto-optical film and a preparation method thereof. The method comprises the following steps: firstly, depositing a layer of YIG film with the thickness of 50-60 nm on a silicon-based substrate as a seed layer through a film preparation process; then, an amorphous Ce: RIG film with the thickness of 10-15 nm is deposited on the YIG, and an amorphous YIG film with the thickness of 1-2 nm is continuously deposited on the amorphous Ce: RIG film; integrally annealing and crystallizing the two layers of amorphous films; and finally, the magneto-optical material film with the required thickness can be obtained by circulating the process of depositing the two layers of amorphous films and integrally annealing and crystallizing. The multi-time deposition annealing magneto-optical thin film material is used, the phase purity of the Ce: RIG thin film and the Ce < 3 + > content in the thin film are improved, compared with a high-temperature deposition and multi-time deposition annealing process, the thermal budget is lower, substrate oxidation can be effectively avoided, the problems of precipitates and element valence states of the silicon-based polycrystalline magneto-optical thin film are solved, and the yield of the silicon-based polycrystalline magneto-optical thin film is improved. And the method has great significance in preparation of the Ce: RIG thin film with high phase purity.

The invention relates to a novel luminescent material with high thermal stability for plant illumination, the chemical general formula of the luminescent material is CaLuGaO4: 0.01 Bi < 3 + >, yEu < 3 + >, and y = 0.01-0.15; the material generates blue-red dual emission under 365 nm effective excitation, the blue-red dual emission is 400-550 nm blue-light broadband emission and 600-700 nm red-light narrow-band emission respectively, the material also has high thermal stability, the emission intensity of the material at the working temperature of 423 K can keep 81.7% of the initial value at the room temperature of 298 K, the blue-red dual emission of the CaLuGaO4: 0.01 Bi < 3 + >, yEu < 3 + > (y = 0.01-0.15) luminescent material is high in absorption spectrum matching degree with chlorophyll a and chlorophyll b, and the luminescent material can be widely applied to the field of luminescent materials. The device can be applied to plant illumination.

This invention discloses a method for preparing hybrid metal halide crystals based on in-situ organic reactions. The method first dissolves bismuth bromide or antimony bromide in a mixed solution of dimethyl sulfoxide and hydrobromic acid. Then, acetone is added to the reaction system, allowing dimethyl sulfoxide and acetone to sequentially generate intermediate and product cations under acidic conditions. These two cations enter the hybrid metal halide crystal lattice as organic components in an independent and mixed manner, thereby achieving a directional structural transformation of three highly correlated types of hybrid metal halides. The transformation rate depends on the system's settling temperature. The compound product prepared by this invention is lead-free, has low toxicity, and yields crystals with high integrity and crystallinity. This method is simple, capable of mass production, and highly suitable for widespread application.

This application discloses a modified sodium iron pyrophosphate cathode material, its preparation method, cathode sheet, secondary battery, and power supply device, belonging to the field of secondary battery technology. The chemical formula of the modified sodium iron pyrophosphate cathode material is Na. x Fe 3‑y M y (PO4) 2‑z‑m (P2O7) 1+z N m @C, where 3.80≤x≤4.0, 0.01≤y≤0.03, 0.005≤z≤0.015, 0.01≤m≤0.03, and N is P2O7. 4‑ H2P2O7² ‑ H3P2O7 ‑ PO3F² ‑ At least one of the following, M is at least one of Sr, Y, W, and Fe. The modified sodium iron pyrophosphate cathode material contains M element and N group. The M element acts on the iron site, and the N group acts on the anionic group framework, so that the modified sodium iron pyrophosphate cathode material has both high phase purity and high compaction density, which synergistically improves the charge-discharge specific capacity and volumetric energy density.

The invention relates to the technical field of batteries, and discloses a preparation method of a lithium nickel manganese oxide positive electrode active material, a battery monomer, a battery device and a power utilization device. The lithium nickel manganese oxide positive electrode active material in the battery monomer comprises a substrate and a coating layer arranged on the surface of the substrate; the matrix comprises single-crystal lithium nickel manganese oxide, the single-crystal lithium nickel manganese oxide is a flaky particle, the length of the flaky particle is 1-5 [mu] m, the width is 1-5 [mu] m, and the thickness is 0.25-1 [mu] m; the coating layer comprises lithium-based oxysalt and / or oxide containing an M element, and the M element is selected from one or more of silicon, boron, aluminum and titanium; in the matrix surface layer, the content of the M element is less than or equal to 100 ppm; wherein the substrate surface layer refers to an area which vertically extends 200nm from the surface of the substrate to the interior of the substrate. The battery monomer provided by the embodiment of the invention has relatively high rate capability and relatively good cycle performance.

The invention discloses an ion exchange resin magnetic material sintering furnace which is used for performing oxygen introduction sintering on a precursor, performing heat preservation on a furnace chamber through an inner heat preservation ring and a heat preservation column core in the heating sintering process, determining a specific temperature stage through a CO detector and adjusting the oxygen introduction amount by adjusting a flashboard air adjusting valve, and is convenient to operate and high in practicability. And the temperature control is not easy to deviate. The furnace is characterized by comprising a furnace body and a furnace door, the furnace door is detachably arranged on the furnace body, the furnace body sequentially comprises a furnace shell, a heat insulation layer, a heating module and a furnace cavity from outside to inside, a gap exists between the heat insulation layer and the furnace shell, an air heat insulation layer is formed, heat escape is reduced, and the heating module is close to the furnace cavity and wraps the furnace cavity. The furnace chamber is rotatably located in the heating module, blades are arranged in the furnace chamber, the blades scatter a precursor in the rotating process of the furnace chamber, and the furnace door comprises an inner heat preservation ring and a heat preservation column core which are used for blocking the furnace chamber and conducting heat preservation on the furnace chamber.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a nano-boron-loaded two-dimensional material compound and a preparation method and application thereof. The preparation method of the nano-boron-loaded two-dimensional material compound comprises the following steps: S1, jointly dissolving boron powder and an etching agent in an organic solvent, carrying out ultrasonication, then adding an antioxidant, stirring, centrifuging, and taking supernate to obtain a nano-boron solution; s2, adding a surfactant into the two-dimensional material single-layer dispersion liquid, uniformly mixing, adding into the nano-boron solution, stirring under the condition of protective gas, and finally drying to obtain the nano-boron loaded two-dimensional material compound. The nano boron loaded two-dimensional material compound provided by the invention has the advantages of simple process, low synthesis temperature, uniform chemical components of synthesized powder, good crystal morphology, high phase purity and the like. And when being used as a negative electrode material, the composite material has a better activation effect on electrochemical inertness of boron, so that the battery has relatively high energy density and power performance.