39results about "Titanates" patented technology

The invention relates to a sodium electrode layered oxide and a preparation method and application thereof. The sodium electrode layered oxide comprises a positive electrode material and a coating layer on the particle surface of the positive electrode material, the coating layer comprises perovskite and sodium metaaluminate. The sodium electrode layered oxide provided by the invention has a uniform composite coating layer comprising perovskite and sodium metaaluminate, and by combining interface gradient doping, the cycling stability of a positive electrode material under high voltage can be remarkably improved.

The invention provides an anion-doped perovskite type titanate material and a preparation method and application thereof, the structural formula of the anion-doped perovskite type titanate material is AxByTiOzN1-z, A is an alkali metal element, B is a rare earth element, N is an anion element, 0 lt; x is less than or equal to 1, 0lt; y < = 1, 0lt; z < = 4. The prepared anion-doped perovskite type titanate material is applied to a negative electrode of a lithium ion battery, and compared with a traditional perovskite type titanate material, the anion-doped perovskite type titanate material has better fast charging performance and power characteristics, ultra-long cycle life and excellent safety.

The application relates to an aluminum-doped lithium titanate-coated ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: adding metal salt solution, precipitant solution and complexing agent solution into a bottom liquid in parallel flow, and performing a coprecipitation reaction under stirring conditions; after the coprecipitation reaction is completed, the temperature and stirring speed are kept unchanged, aluminum-titanium solution, precipitant solution and ammonia solution are continuously mixed in parallel flow, and a spherical hydroxide is obtained after the reaction is completed; solutes in the aluminum-titanium solution include aluminum salt, titanium salt and hydrogen peroxide; a lithium source is mixed with the spherical hydroxide, and preheating treatment and heat treatment are sequentially performed to obtain the aluminum-doped lithium titanate-coated ternary positive electrode material. The preparation method adds the aluminum-titanium solution in the coprecipitation reaction process, forms an aluminum-doped lithium titanate precursor, and thus the aluminum-doped lithium titanate-coated ternary positive electrode material is obtained through heat treatment, and the interface stability is improved.

The present invention relates to a potassium magnesium titanate capable of increasing the friction coefficient of a high load region when used in a friction material, the potassium magnesium titanate being represented by the compositional formula KxMg0. 4Ti1. 6O4-y in which x is 0.1 < = x < = 0.6 and y = (0.8-x) / 2, the ratio (Ia / Ib) of the peak area (Ia) at 100 cm <-1 > to 165 cm <-1 > to the peak area (Ib) at 215 cm <-1 > to 1-325 cm <-1 > in the Raman spectrum of the potassium magnesium titanate being 0.03 or more, and the ratio (Ia / Ib) of the peak area (Ib) at 215 cm <-1 > to 325 cm <-1 > being 0.03 or more. The ratio (Ic / Ib) of the peak area (Ic) at 785 cm <-1 > to 900 cm <-1 > to the peak area (Ib) at 215 cm <-1 > to 325 cm <-1 > is 0.40 or less.

The invention discloses a method for preparing a flaky PbTiO3 template, and relates to the technical field of PbTiO3 preparation, and the method comprises the following steps: preparing pure flaky Bi4Ti3O12, preparing a flaky PbBi4Ti4O15 precursor, preparing flaky PbTiO3, and preparing the pure flaky PbTiO3 template. According to the preparation method, flaky Bi4Ti3O12 is prepared from TiO2 and Bi2O3, flaky PbBi4Ti4O15 is prepared from the flaky Bi4Ti3O12, PbO and TiO2, flaky PbTiO3 is prepared from PbBi4Ti4O15 and PbO, a PbTiO3 template with a complete and stable flaky crystal structure is prepared based on a three-step molten salt method, the PbTiO3 template does not react with a matrix at high temperature, lead-based crystal grains are induced by the flaky PbTiO3 template to form oriented growth, and the textured lead-based piezoelectric ceramic is successfully formed. And the shortages existing in the traditional method are solved.

The present invention belongs to the technical field of nitrate reduction, and provides a copper-based perovskite nanofiber, a preparation method thereof, and application thereof in electrocatalytic reduction of nitrate. La(NO3)3·6H2O, Co(NO3)2·6H2O, and Cu(NO3)2·3H2O are added to a mixed solvent and stirred to obtain a precursor solution; the precursor solution is electrostatically spun to obtain nanofibers, and the nanofibers are calcined to obtain copper-based perovskite nanofibers. The LaCu x Co 1‑x O3 perovskite nanofibers are used as electrocatalysts for the electrocatalytic reduction of nitrate to produce ammonia. Copper-based perovskite nanofibers provide abundant active sites and contact areas in the electrocatalytic reduction of nitrate, have excellent performance in the electrocatalytic reduction of nitrate, have good cycle stability, practicality and long-term development prospects, and can solve the problem of excessively high nitrate content in wastewater.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a lithium lanthanum titanate epitaxial growth and titanium / lanthanum doping regenerated waste lithium cobalt oxide positive electrode material and a preparation method thereof.La3 + and Ti4 + gradient doping layers are arranged in regenerated lithium cobalt oxide particles, and the regenerated lithium cobalt oxide particles are formed through a three-dimensional crack network of waste lithium cobalt oxide; a Li < 3x > La < 2 / 3-x > TiO3 coating layer is epitaxially grown on the surface of the particle; the gradient doping layer broadens a lithium ion transmission channel, and the Li3xLa2 / 3-xTiO3 coating layer is used as a fast ion channel. According to the invention, a sol-gel method is used, a lithium source, a titanium source and a lanthanum source are uniformly attached to the surface of a material, and then high-temperature sintering is carried out, so that epitaxial growth of Li3xLa2 / 3-xTiO3 and gradient doping of La3 + / Ti4 + are realized while material structure repair is completed. A three-dimensional fast ion channel is provided for the deintercalation and intercalation of Li < + >, and the regenerated lithium cobalt oxide positive electrode material with excellent electrochemical performance is obtained.

This invention relates to the field of sodium-ion battery technology, specifically to Na... 0.86 Cu 0.43 Ti 3.57 O8 nanowires, their preparation method, and their application in sodium-ion batteries. This invention aims to solve the problems disclosed in the prior art regarding Na... 0.86 Cu 0.43 Ti 3.57 To address the technical shortcomings of high preparation temperatures and poor safety in existing O8 material preparation methods, a method for preparing Na using electrospinning is provided. 0.86 Cu 0.43 Ti 3.57 A new method for producing O8, and the resulting Na 0.86 Cu 0.43 Ti 3.57 O8 nanowires are used as anode materials for Na-ion batteries.

The embodiment of the invention relates to a solid electrolyte material and a preparation method and application thereof, and the preparation method comprises the following steps: adding a source A, a source B, a source C, a source D, a source E and a source H into a first solvent, and carrying out first ball-milling mixing to obtain mixed slurry; carrying out spray drying treatment on the mixed slurry to obtain a precursor material; placing the precursor material in sintering equipment for sintering treatment to obtain the oxide solid electrolyte; ball-milling, washing and drying a second solvent, alkali metal salt and the oxide solid electrolyte for the second time, so that dangling bonds are exposed on the surface of the oxide solid electrolyte, nitrile groups, ester groups and / or ether bonds in the second solvent can be chemically bonded with the dangling bonds, and a coating layer is formed on the surface of the oxide solid electrolyte, therefore, the solid electrolyte material is obtained.

The invention belongs to the technical field of sensors, and discloses a gas sensitive material and a preparation method thereof, a solid electrolyte gas sensor and a refrigerator. The gas sensitive material comprises AxBy (TiO3) n, x: y = (1-100): (1-100), n is greater than or equal to 1 and less than or equal to 400, and A and B respectively comprise any one of Fe, Co, Ni, Cu, Zn, Mn and Cd. By adopting the gas sensitive material provided by the invention, the sensitivity, selectivity and service life of the solid electrolyte gas sensor can be improved.

The present application provides a modified electrolyte and a preparation method therefor, an electrode material, and a battery. The modified electrolyte comprises a basic electrolyte and metal particles attached to the surface of the basic electrolyte; the material of the metal particles comprises one or more of a nickel element, a copper element, a tin element, an iron element, a cobalt element and a precious metal element. According to the modified electrolyte provided by the present application, a specific solid electrolyte is used as the basic electrolyte, the surface of the basic electrolyte is modified with the metal particles, the electronic conductivity of the modified electrolyte is effectively improved by means of cooperation of the basic electrolyte and the metal particles, and the positive electrode material containing the modified electrolyte can simultaneously improve the effective transmission of ions and electrons, such that the battery having the positive electrode material has both low interface impedance and good electrochemical performance.

A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

The present invention discloses a method for preparing carbon-intercalated potassium magnesium titanate, comprising the following steps: immersing flaky potassium magnesium titanate in an acid solution containing copper ions with a pH of 3 to 5 for 1 to 24 hours; washing the solution until neutral to obtain a neutral solution; adding polyethanolamine to an alkaline potassium permanganate solution to obtain an alkaline solution of polyethanolamine; gradually adding the alkaline solution of polyethanolamine dropwise to the neutral solution, reacting at 60 to 80°C for 1 to 12 hours; washing the solution until neutral, and calcining it at 800 to 1000°C for 2 to 12 hours to obtain the carbon-intercalated potassium magnesium titanate. The present invention finds that when the carbon-intercalated potassium magnesium titanate is used as a friction material, the brake noise caused by friction between the carbon-intercalated potassium magnesium titanate and the brake disc is significantly reduced.

Provided is a magnesium potassium titanate capable of increasing, when used in a friction material, the coefficient of friction of the friction material in a high-load region. A magnesium potassium titanate is represented by a composition formula KxMg0.4Ti1.6O4-y [where 0.1 ≤ x ≤ 0.6 and y = (0.8-x) / 2], wherein, in terms of Raman spectrum, a ratio (Ia / Ib) of a peak area (Ia) in a range of 100 cm-1 to 165 cm-1 to a peak area (Ib) in a range of 215 cm-1 to 325 cm-1 is not less than 0.03 and a ratio (Ic / Ib) of a peak area (Ic) in a range of 785 cm-1 to 900 cm-1 to the peak area (Ib) in the range of 215 cm-1 to 325 cm-1 is not more than 0.40.

The technical field of a NMBT basic system unit with topological insulator phase transition characteristics The present invention relates to the multi-disciplinary field of electronic materials, and describes a composite molecular structure composed of different physical properties of manganese-based NdBaMnO3 (NM) and titanium-based BaNdTiO3 (BT), and NMBT particles and thin film structures composed of the same, a NMBT basic system unit, which has the technical and method of topological insulator phase transition characteristics under the action of an electric field, and the occurrence of the giant magnetoresistance effect, anomalous Hall effect and abnormal dielectric effect at room temperature.

Methods of manufacturing polyoxotitanates, polymer-polyoxotitanate composite materials and novel polyoxotitanates are provided. The invention enables spectral conversion of sunlight towards longer wavelengths, which is beneficial for increasing 5 available photons for photosynthesis.

The present application provides a preparation method of magnesium niobate, comprising: mixing MgO and Nb2O5 uniformly by wet ball milling, and drying to obtain a mixed powder; water-quenching the mixed powder after raising its temperature to 1500 °C to 1700 °C in 1 h to 3 h to obtain solid particles of core-shell structure encapsulations; and raising the temperature of the solid particles to 1000 °C to 1200 °C and holding the temperature to obtain the magnesium niobate. The present application provides solid particles of a core-shell structure encapsulation through a water-quenching process, then raising the temperature of the obtained particles rapidly and sintering, MN with high purity, high stability, high homogeneity of both Mg2+ and Nb5+ components, and high reactivity is obtained, which is conducive to fully mix MgNb2O6, PbO and TiO2 to form the liquid phase at high temperature and thus form raw materials for PMNT crystals growth with better purity and homogeneity, further contributing to obtain a PMNT single crystal with a single perovskite structure, high purity and excellent piezoelectric properties, and thus improving the yield.

The application provides a lithium-rich manganese-based positive electrode material modified by ammonium fluorotitanate and a preparation method thereof. The molecular formula of the lithium-rich manganese-based positive electrode material is xLi2MnO3·(1-x)LiMO2, M is one or more of transition metals Ni, Co and Mn, and 0x<1. The preparation method is as follows: first, the lithium-rich manganese-based positive electrode material and ammonium fluorotitanate are uniformly mixed by a solid-phase method or a liquid-phase method, and then annealing is performed under an inert atmosphere to obtain the lithium-rich manganese-based positive electrode material modified by ammonium fluorotitanate. The material surface of the application integrates double-element (titanium and fluorine) doping, spinel phase and oxygen vacancies, and the first cycle coulomb efficiency and cycle performance of the lithium-rich manganese-based positive electrode material are improved. The performance improvement is attributed to the strong integrated surface, in which the oxygen vacancies remove the surface unstable oxygen and inhibit the irreversible oxygen release, and the titanium and fluorine doping helps to stabilize the surface structure of the material. The preparation method is simple in operation, environment-friendly, non-toxic and harmless, and has strong economic adaptability, and is conducive to industrial application.

The invention discloses application of a perovskite-based titanate adsorbent to enrichment of strontium by using an ion exchange method and an electrochemical switch ion exchange method, and belongs to the technical field of strontium-containing wastewater treatment. The strontium ion adsorbent is titanate of a Ruddlesden-Popper type perovskite structure, contains rare earth metal Ln and variable valence metal Ti, has a [Ln2Ti3O10] n2n-layered framework, and alkali metal ions are arranged between layers, and the strontium ion adsorbent can deeply remove < 90 > Sr in actual acid waste liquid generated in the industrial production process. After the strontium ion adsorbent is prepared into a working electrode, strontium ions in a water body can be enriched through an electrochemical switch ion exchange method, the strontium ion adsorbent has high adsorption capacity and good selectivity in neutral and acid solutions, and regeneration and recycling of the working electrode can be achieved through change of applied potential.

Provided are titanium oxide particles having excellent solar reflectance. The titanium oxide particles contain titanium dioxide, and a value calculated by standard deviation / average particle diameter × 100 of the titanium oxide particles is 30% or less. A method for producing titanium oxide particles includes a mixing step of mixing a titanium compound, a molybdenum compound, and a potassium compound and / or a sodium compound to form a mixture, and a firing step of firing the mixture, wherein a molar ratio of Mo / M1 (where M1 represents Na and K) in the mixture is more than 0.5.

The present invention relates to a formulation for preparing an optical metal oxide layer, comprising a polyoxometallate (POM) complexed with metal oxide nanoparticles (NP); a process for preparing an optical metal oxide layer using the formulation; and an optical device comprising the optical metal oxide layer.

Provided are titanium oxide particles having excellent solar reflectance. The titanium oxide particles contain titanium dioxide, and a value calculated by standard deviation / average particle diameter × 100 of the titanium oxide particles is 30% or less. A method for producing titanium oxide particles includes a mixing step of mixing a titanium compound, a molybdenum compound, and a potassium compound and / or a sodium compound to form a mixture, and a firing step of firing the mixture, wherein a molar ratio of Mo / M1 (where M1 represents Na and K) in the mixture is more than 0.5.

The application discloses a preparation method of a ferroelectric nano PbTiO3 semiconductor material based on positive electrode polarization and application of the ferroelectric nano PbTiO3 semiconductor material in photoelectrochemical cathodic protection. The preparation method of the ferroelectric nano PbTiO3 semiconductor material comprises the following steps: (1) mixing TiO2, PbNO3 and an aqueous KOH solution to obtain a suspension, and then performing a hydrothermal reaction to obtain single-domain ferroelectric PbTiO3; (2) dispersing the single-domain ferroelectric PbTiO3 in ethanol to form a suspension; dropping the suspension on FTO glass, drying, and then performing first calcination; then dropping anhydrous alcohol solution of TiCl4, drying again, and then performing second calcination to obtain PTO after necking treatment; and finally performing positive electrode polarization in a saturated potassium chloride solution to obtain the ferroelectric nano PbTiO3 semiconductor material. The hydrothermal method is used to synthesize the ferroelectric nano material PbTiO3 which has a relatively negative conduction band potential, a large self-polarization intensity and a high Curie temperature; the internal electric field of the ferroelectric material effectively separates charges and holes, and promotes the ability of photoelectrochemical cathodic protection.

The invention provides an ultrahigh-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: providing a precursor material which is nickel-cobalt-manganese hydroxide with a nickel molar ratio of 90% or more; the precursor material is subjected to wet doping, doping elements comprise Sr and La, and a first intermediate material is obtained; mixing the first intermediate material with a lithium source, and performing first sintering to obtain a second intermediate material; carrying out wet coating on the second intermediate material by using a first coating material, and carrying out second sintering to form a third intermediate material, the first coating material comprising lithium lanthanum titanate and Li3PO4; and coating the third intermediate material with a second coating material, and performing third sintering to obtain the ultrahigh-nickel ternary positive electrode material, the second coating material comprising boric acid and / or boron oxide. The ultrahigh-nickel ternary positive electrode material prepared by the invention has excellent structural stability, shows good material conductivity and relatively high cyclicity, and has good electrical performance.

The present invention belongs to the technical field of preparation and application of photocatalysts, and specifically relates to Bi2Ti2O7 nanofiber photocatalysts, preparation methods and applications thereof. The preparation method of the Bi2Ti2O7 nanofiber photocatalyst described in the present invention comprises the following steps: adding bismuth acetate to a mixed solution of glacial acetic acid and methanol to obtain solution A; adding tetrabutyl titanate to acetylacetone and methanol to obtain solution B; adding solution B dropwise to solution A to obtain solution C; adding polyvinyl pyrrolidone to solution C to obtain a precursor solution; loading the precursor solution into a syringe, performing electrostatic spinning, and simultaneously irradiating with infrared light to obtain precursor nanofibers; calcining the precursor nanofibers to obtain a Bi2Ti2O7 nanofiber photocatalyst. The Bi2Ti2O7 nanofiber photocatalyst prepared by the present invention has a single-phase structure, a large specific surface area, and good dispersibility. The present invention also provides applications of the catalyst.

The invention relates to a copper calcium titanate nanoflower and a preparation method thereof, and belongs to the field of high-dielectric-constant electronic ceramic materials. The size of the copper calcium titanate nanoflower is 100-500 nm, the shape of the copper calcium titanate nanoflower is petal-shaped, and the dielectric constant of the copper calcium titanate nanoflower at 100 Hz is 2 * 10 < 4 >-8 * 10 < 5 >. The preparation scheme of the copper calcium titanate nanoflower comprises the following steps: firstly synthesizing titanium dioxide nanoflower from tetrabutyl titanate and hydrochloric acid through a hydrothermal method; and then synthesizing the copper calcium titanate nanoflower by a hydrothermal method by taking the titanium dioxide nanoflower as a template, copper nitrate trihydrate and calcium nitrate tetrahydrate as raw materials and a phenolic compound as an additive. The copper calcium titanate nanoflower prepared by the method has excellent dielectric properties and petal-shaped morphology, can be widely applied to high-dielectric composite materials, and can also be applied to the field of dielectric capacitors. The preparation process of the copper calcium titanate nanoflower is simple, convenient and easy to implement, low in cost and suitable for industrial continuous and mass production, and the prepared copper calcium titanate nanoflower is excellent in performance, has petal-shaped morphology and can be used for dielectric composite materials.

The invention relates to a material of the formula SnTiO3 having a crystal structure comprising layers, wherein the layers comprise Sn(II) ions, Ti(IV) ions and corner- sharing O6-octahedra, the corner-sharing O6-octahedra form sub-layers, the Ti(IV) ions are located within 2 / 3 of the corner-sharing O6-octahedra to form corner-sharing TiO6-octahedra, the corner-sharing TiO6-octahedra form a honeycomb structure comprising hexagons within the sub-layers, the hexagons have Ti(IV)-voids within, the Sn(II) ions are located above and below the Ti(IV)-voids with respect to the sub-layers and the crystal structure satisfies at least one of the following features (i) and (ii): (i) the Sn(II) ions have a tetrahedral coordination shell, the tetrahedral coordination shell contains three O ions of the layer and an electron lone pair of the Sn(II) ion, the electron lone pair is located in a top position with respect to the three O ions of the layer, (ii) the layers are stacked in a specific manner.

The invention belongs to the technical field of lithium ion battery materials, and discloses a lithium lanthanum titanium oxide material suitable for a negative electrode additive and a preparation method and application of the lithium lanthanum titanium oxide material. The material comprises an inner core and a coating layer coating the surface of the inner core, and the coating layer is an inorganic lithium salt. A nanoscale inorganic lithium salt coating layer with a low-surface-energy crystal face is constructed on the surface of an LLTO material, when the LLTO material serves as a negative electrode additive to be applied to a negative electrode, inorganic lithium salt serves as a nucleation site of an SEI film preferentially, and the SEI film is induced to grow on the surface of the negative electrode in an oriented mode; meanwhile, the inorganic lithium salt has a large number of lattice defects, a large number of uniformly-distributed nucleation centers are provided for lithium ion deposition, formation of an SEI film on the surface of the negative electrode is promoted, and consistency and integrity of SEI formed on the negative electrode are guaranteed; and in cooperation with the LLTO core material, the quality of the SEI membrane is improved, and meanwhile, a lithium ion rapid diffusion channel is constructed at the negative electrode, so that the dynamic performance and the cycle performance of the lithium ion battery are remarkably improved.

The application discloses preparation of a composite metal heterojunction modification material and application of the composite metal heterojunction modification material in a lithium battery. 12 The application first synthesizes Bi4Ti3O 12 -NiCo2S4 heterojunction nanosheet-shaped composite metal sulfide heterojunction material by using a non-aqueous sol-gel casting method, and then uniformly coats the material on one side of a battery diaphragm in a slurry to obtain the composite metal heterojunction modification material. The heterojunction nanosheet structure in the composite metal heterojunction modification material can provide a channel for rapid diffusion of lithium ions, improve interface polarity, increase surface catalytic active sites, optimize affinity to polysulfides, and promote catalytic conversion, so that the rate performance and cycle stability performance of the lithium-sulfur battery are effectively improved.

The present invention relates to a formulation for preparing an optical metal oxide layer, the formulation comprising polyoxometalates (POMs) complexed to metal oxide nanoparticles (NPs); a method for preparing an optical metal oxide layer using said formulation; and an optical device comprising said optical metal oxide layer.