86results about "Chromium compounds" patented technology

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M1]x[M2](1−x)[Nb]y[O]z, wherein: M1 and M2 are different; M1 represents one or more of Ti, Mg, V, Cr, W, Zr, Mo, Cu, Fe, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Te, Se, Si, Sb, Y, La, Hf, Ta, Re, Zn, In, or Cd; M2 represents one or more of Mg, V, Cr, W, Zr, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; and wherein x satisfies 0<x<0.5; y satisfies 0.5≤y≤49 z satisfies 4≤z≤124.

The invention discloses a chromium-site high-entropy chromium lithium titanate material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The crystal structure of the chromium-site high-entropy chromium lithium titanate material is a single spinel solid solution phase, and the chemical general formula of the chromium-site high-entropy chromium lithium titanate material is Li (Cr < 1-x-y-z-w > V < x > Fe < y > Mn < z > Al < w >) TiO4. According to the preparation method, chromium trioxide serves as an oxidizing agent, carbohydrate serves as a reducing agent, and rapid synthesis is achieved through a one-step combustion method. The process is simple and efficient, and the prepared chromium-site high-entropy chromium lithium titanate material has relatively high specific capacity and excellent cycling stability and can be applied as a lithium ion battery negative electrode material. According to the invention, the problems of limited theoretical capacity and poor rate capability of the existing chromium lithium titanate material are effectively solved, and a new way is provided for developing a high-performance lithium ion battery negative electrode material.

An object is to provide a copper-chromium oxide spinel having excellent dispersibility in a resin composition and excellent adhesion to plating, and a resin composition and a resin molded article containing the copper-chromium oxide spinel. Specifically, provided is a copper-chromium oxide spinel with a particle size distribution spread SPAN = (D90 - D10) / D50 of 2 or less where, in volume-converted particle size distribution obtained by a laser diffraction and scattering method, particle sizes with a cumulative frequency from a smaller particle size side of 10%, 50%, and 90% are D10, D50, and D90, respectively.

The present invention relates to an oxygen ion conductor material with high oxygen ion conductivity in the medium and low temperature range and a preparation method thereof. The chemical composition of the material is represented by: Bi4(V 1‑y M y ) x O 11+z , wherein M is a metal cation, 1.7≤x≤2.2 and x≠2, 0<y≤0.3, and z depends on the neutral balance of the metal cation composition. The modified bismuth vanadate Bi4 (V 1‑y M y ) x O 11+z Materials have simple preparation process, low cost, stable structure and high conductivity, among which Bi4(V 0.9 Cu 0.1 ) 1.9 O 10.465 At 300℃, the grain conductivity is 10 ‑2 S / cm level, the total ionic conductivity of ceramics reaches 1.2×10 ‑3 S / cm, which is about 1 order of magnitude higher than the current highest value reported in the literature, and can meet the application requirements of medium and low temperature oxide fuel cells and oxygen sensors.

A method for the resource utilization of chromium-containing sludge involves conditioning, decomposition, and roasting of the sludge. During roasting, a non-oxidizing atmosphere is introduced for protection, ensuring that chromium (Cr) is enriched in the residue in a non-toxic, non-volatile, low-valence state, thus producing high-value-added calcium-chromium sand. Simultaneously, sulfur-containing flue gas is collected during roasting to produce sulfuric acid or sodium sulfite, preventing sulfur diffusion and air pollution. This significantly reduces hazardous solid waste emissions from related production processes and lowers hazardous waste disposal costs. This method achieves both the harmless treatment of chromium-containing sludge and the comprehensive resource utilization of chromium, calcium, and sulfur within the sludge.

The present invention discloses a method for preparing a spinel-type lithium chromium titanate negative electrode material, which belongs to the field of lithium-ion battery electrode materials. The present invention grinds a low-valent compound of solid chromium or metallic chromium powder with a solid titanium compound, a solid lithium-containing compound, and a solid carbohydrate evenly, adds a trace amount of liquid medium to continue grinding and mixing, and then performs a thermal decomposition treatment; the material is taken out and cooled, then ground for a second time, and then placed in a muffle furnace for a second calcination. After cooling, it is ground and carbonized to obtain a spinel-type lithium chromium titanate negative electrode material. The method of the present invention has low preparation cost, is easy to operate and control, has a low reaction temperature, a high yield of the target product, good uniformity, and stable electrochemical performance, and can effectively solve the problem that the existing LCT preparation method is relatively complex and costly.

A method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy, a plasmonic gold prism array arranged on a substrate for digital surface enhanced Raman spectroscopy, and a method of using a plasmonic gold prism array that is arranged on a substrate for digital surface enhanced Raman spectroscopy are disclosed. The method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy includes depositing more than one layers of chromium and gold onto a plasmonic substrate comprising a monolayer of polystyrene beads and removing the monolayer of polystyrene beads under sonication in ethanol.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M][Nb]y[O]z; wherein the active electrode material is oxygen deficient; wherein M consists of one of Mg, Cr, W, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; y satisfies 0.5≤y≤49; and z satisfies 4≤z≤124.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure (11) occupies 80% by volume or more, and has a crystallite size of 70 nm or less.

This provides a new material that exhibits negative thermal expansion. [Solution] The negative thermal expansion material is Ti (3) 2-x M x O3(M contains at least one element selected from Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, La, Ta, W, Bi, 0

The invention relates to a class of electrochemical energy storage materials and a preparation method and application thereof. A porous metal oxide-based electrochemical energy storage material at least comprises a host metal oxide with a hierarchical pore structure; wherein, the host metal oxide is a single crystal, quasicrystal, or twin crystal structure with ordered atomic lattice arrangement, the crystal is rich in oxygen atom vacancy defects, the structural general formula is MxOy-z, wherein M is selected from one or more combinations of niobium element, molybdenum element, titanium element, vanadium element, manganese element, iron element, cobalt element, nickel element, copper element, zinc element, tungsten element, tantalum element, and zirconium element; and 1≤x≤2, 1≤y≤5, and 0.1≤z≤0.9, preferably Nb2O5-z.

The present application relates to modified lithium ion positive electrode material and its manufacturing method, and lithium ion battery. A modified lithium ion positive electrode material is provided, which comprises a positive electrode material body and a surface coating layer, wherein the chemical composition of the surface coating layer is high-entropy solid-state electrolyte Li7La3(M x M1 a M2 b M3 c …Mi j )2O 12 , wherein M is Zr or Ti, and x>0; M1, M2, M3…Mi are elements other than Li, La, Zr and Ti, i is a positive integer and 5≤i≤10, a, b, c…j are stoichiometric coefficients of each element, a, b, c…j≥0, and x+a+b+c+…+j=1. The present application further improves the ion conductivity at the interface by high-entropy of the solid-state electrolyte, and further reduces the problem of energy density reduction caused by surface coating by lithium enrichment.

The invention provides a wide-band-gap ferromagnetic insulator material. The chemical formula of the wide-band-gap ferromagnetic insulator material is Cd2CrSbO6. The invention also provides a method for preparing the wide-band-gap ferromagnetic insulator material, which comprises the following steps: (1) sufficiently grinding and mixing CdO, Cr2O3 and Sb2O5 in a protective gas atmosphere to obtain a mixture; (2) sealing and wrapping the mixture, and then carrying out heating and pressurizing treatment; and (3) cooling and depressurizing the treated product obtained in the step (2). The ferromagnetic insulator material Cd2CrSbO6 disclosed by the invention has a potential application value in spintronics devices.

This invention discloses a copper-chromium catalyst, its preparation method, and its application. The preparation method of the catalyst includes: (1) mixing polylactic acid with dichloromethane and ethanol to obtain a polymer solution, adding a soluble copper salt to it, stirring, and obtaining a spinning solution; (2) using a coaxial electrospinning nozzle to perform electrospinning with the obtained spinning solution, and collecting the obtained solid; (3) placing the obtained solid in an ethanol solution of trimesic acid to react, washing and drying after the reaction, and collecting the obtained solid; (4) dissolving a soluble chromium salt in ethanol and reacting it with the obtained solid, then washing and drying, and collecting the obtained catalyst precursor; (5) calcining the obtained catalyst precursor to obtain an unformed catalyst, then pressing it into tablets to obtain the copper-chromium catalyst. This catalyst can improve the conversion rate and selectivity of the catalyst in the hydrogenation of dimethyl maleate to prepare 1,4-butanediol and co-production of γ-butyrolactone and tetrahydrofuran.

Doped titanium niobate is provided, which has a chemical structure of Ti(1-x)M1xNb(2-y)M2yO(7-z)Qz or Ti(2-x′)M1x′Nb(10-y′)M2y′O(29-z′)Qz′, wherein M1 is Li, Mg, or a combination thereof; M2 is Fe, Mn, V, Ni, Cr, or a combination thereof; Q is F, Cl, Br, I, S, or a combination thereof; 0≤x≤0.15; 0≤y≤0.15; 0.01≤z≤2; 0≤x′≤0.3; 0≤y′≤0.9; and 0.01≤z′≤8.

The invention provides an oxygen-containing small-molecule intercalated hydrotalcite, a rubber composite material, and a preparation method and application of the oxygen-containing small-molecule intercalated hydrotalcite and rubber composite material. The oxygen-containing small molecule intercalated hydrotalcite is obtained by mixing and reacting components including ethanol salt, methoxide and a solvent; the ethanol salt comprises divalent ethanol salt and trivalent ethanol salt; the rubber composite material is prepared from the following components: rubber, oxygen-containing small molecule intercalated hydrotalcite and a vulcanizing agent. The oxygen-containing micromolecule intercalated hydrotalcite prepared by the method has larger interlayer spacing and better dispersity in a rubber matrix, interlayer water can be removed at the temperature of 100 DEG C or below, the influence in the vulcanization process is avoided, and the oxygen-containing micromolecule intercalated hydrotalcite is suitable for a high-temperature vulcanization environment, is used in a rubber composite material and can improve the gas barrier property of the composite material.

The invention relates to a niobium-based near-infrared fluorescent material, which belongs to the field of fluorescent materials and can be represented by a chemical formula (0 < x < = 0.1). The crystal structure of the niobium-based near-infrared fluorescent material is a monoclinic system, and the space group is P12 / m1. Under the excitation of blue light with the wavelength of 447 nm, the main peak of the emission spectrum of the niobium-based near-infrared fluorescent material is 850-860 nm, the full width at half maximum of the emission spectrum is 200-220 nm, and the internal quantum efficiency is 65%-90%, so that the niobium-based near-infrared fluorescent material can be applied to light supplement of night vision equipment.

The invention provides a preparation method of a heterogeneous transition metal chalcogenide material. The preparation method comprises a heating step, a plasma forming step and a deposition step. In the heating step, the chalcogenide solid is heated at a heating temperature to form a chalcogenide gas. In the plasma forming step, reaction gas is introduced to assist the chalcogenide gas in forming chalcogenide plasma. In the deposition step, a substrate is arranged adjacent to the chalcogenide plasma, the substrate comprises a base material and a plating layer, and the chalcogenide plasma and the plating layer are subjected to a deposition reaction at a reaction temperature and a reaction pressure to form the heterogeneous transition metal chalcogenide material with excellent optical characteristics and a surface-enhanced Raman scattering effect. Therefore, the heterogeneous transition metal chalcogenide material can be applied to a surface-enhanced Raman scattering sensor.

The invention belongs to the technical field of stabilization of high-arsenic waste acid, and particularly discloses a method for stabilizing high-arsenic waste acid by using calcium-free roasting chromium slag. Aiming at the problems of long treatment period, large capacity increasing ratio, high secondary pollution risk and the like in the prior art, the method comprises the following steps: drying a byproduct calcium-free roasting chromium slag generated by a chromium salt industrial sodium carbonate roasting process to constant weight; carrying out ball milling on the dried chromium slag subjected to calcium-free roasting; the calcium-free roasting chromium slag powder and the high-arsenic waste acid are uniformly mixed in a reaction kettle for a hydrothermal reaction, and the synergistic stabilization treatment of the calcium-free roasting chromium slag and the high-arsenic waste acid is realized. The strong oxidizing property of Cr (VI) in the chromium slag and the reducibility of As (III) in the waste acid are utilized, and Cr (VI) detoxification and As (III) oxidation are synchronously achieved through an oxidation-reduction reaction; newly generated Cr < 3 + > is combined with H2AsO4 <-> to form a stable mineral phase CrAsO4.

Provided are a negative electrode for a secondary battery, a slurry for a negative electrode, and a method for manufacturing a negative electrode, each of which has improved life characteristics. The negative electrode for a secondary battery contains at least a graphite-based material and a silicon-based material as negative electrode active materials, and a conductive material, the graphite-based material includes a granulated product of artificial graphite and natural graphite, at least a part of the natural graphite in the granulated product is partially flaked to form a flaked portion, and the flaked portion is in contact with the silicon-based material or other granulated product of artificial graphite and natural graphite, or is complexed with the silicon-based material.

The invention discloses a nano chromium oxyfluoride catalyst as well as a preparation method and application thereof, and the catalyst is prepared by taking a chromium source as a precursor, taking small molecular organic acid, a cationic surfactant and a nonionic surfactant as templates, adding a fluorine source and adopting a template agent guiding-solid phase thermal decomposition method. The preparation method comprises the following steps: grinding and mixing a chromium source precursor, a fluorine source and a template agent, reacting the mixture at 100-200 DEG C for 6-48 hours, centrifugally washing the reactant, drying, and sufficiently roasting the dried product in a muffle furnace to obtain the nano chromium oxyfluoride catalyst. The prepared nano chromium oxyfluoride catalyst has extremely high selectivity and stability when applied to a reaction for preparing fluorine-containing olefins (HFOs) through gas-phase HF removal of hydrofluoroalkanes (HFCs), the catalytic selectivity reaches up to 100% (the selectivity of a cis-product Z-HFO-1225ye reaches up to 98%), the catalytic conversion rate reaches 85% or above, and the nano chromium oxyfluoride catalyst has the advantages of being high in conversion rate, high in selectivity, good in stability and suitable for industrial production. The cost is low, and the operation is simple.

The invention discloses an XNbBr4O type compound as well as a design and performance prediction method and application thereof, and belongs to the technical field of transition metal doped niobium oxybromide. Wherein X in the XNbBr4O type compound is vanadium, chromium or cobalt, and the compound has magnetic sequence or ferroelectric distortion regulated and controlled by X element doping. The XNbBr4O type compound disclosed by the invention provides a theoretical basis for designing a novel multiferroic photoelectric device, provides an effective way for rapidly screening a high-performance photoelectric material, and has important scientific significance and application value for guiding subsequent experimental synthesis and device design.

The present invention relates to a modified layered oxide material comprising a C@fluoride@sodium ion layered oxide, wherein the fluoride is a multinary metal fluoride containing an alkali metal. The C in the C@fluoride@sodium ion layered oxide is formed by high-temperature sintering of a cubic phenolic resin. The present invention also discloses a method for preparing the modified layered oxide material, a positive electrode sheet, and a sodium ion battery prepared therefrom. The modified layered oxide material of the present invention can improve the specific capacity, cycle stability, and rate performance of sodium ion batteries.

The present invention relates to the field of metallurgical solid waste resource utilization. Specifically, it relates to a method for selective precipitation and separation of chromium in industrial stainless steel slag and its application. The method for selective precipitation and separation of chromium in industrial stainless steel slag includes: adding the molten chromium-containing stainless steel slag liquid generated during the stainless steel production process into a refining device, where the refining device includes a ladle furnace and / or an induction furnace, adding an alkalinity modifier to the refining device for reaction, so that chromium elements enter the spinel phase and precipitate in a solid state to the bottom of the refining device to form chromium-rich slag; after discharging the liquid chromium-depleted slag above the chromium-rich slag through the slag discharge port of the refining device, performing a first cooling to obtain vitreous silicate; after discharging the chromium-rich slag from the bottom of the refining device, performing a second cooling to obtain chromium-containing spinel. This method can selectively precipitate chromium and separate to obtain chromium-containing spinel and vitreous silicate, realizing high-value utilization of chromium-containing stainless steel slag while fixing chromium.

This invention discloses a core-shell structured rare-earth oxide / gallium oxide composite particle for magnetoresistive thin film preparation and its preparation method. The composite particle comprises a core and a shell, wherein the core is composed of La. 1‑x Ca x The rare-earth oxide precursor powder of TmO3 has a gallium oxide shell. The preparation method includes: first, preparing a homogeneous suspension of the rare-earth oxide precursor powder and liquid gallium metal; then, spreading the precursor powder in the suspension, followed by stirring, multi-stage ultrasonic dispersion, and separation using an inert ceramic scraper to obtain core-shell structured precursor particles coated with liquid gallium metal; finally, sintering to transform the liquid gallium metal into a gallium oxide shell. When used as a thermal resistance evaporation source, the composite particles of this invention effectively solve the problems of compositional shift and evaporation source explosion and splashing caused by vapor pressure differences in multi-component materials. They offer advantages such as flexible component design, good thermal stability, and low preparation cost, making them suitable for preparing magnetoresistive effect composite thin films.

To provide an MRI apparatus equipped with a refrigerating machine which is filled with a cold storage material that has large specific heat and small magnetization in a cryogenic region and has good manufacturability, and has high efficiency and excellent cooling performance.SOLUTION: An MRI apparatus of an embodiment is equipped with a refrigerating machine which accommodates a cold storage material including particles composed of an intermetallic compound with the ThCr2Si2 type structure occupying 80 vol.% or more, the particles having a crystallite size of 70 nm or less. In the cold storage material, in the ThCr2Si2 type structure, a Th site is at least one element selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y, the Cr site is at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni and Cu, and the Si site is at least one element selected from Si and Ge.SELECTED DRAWING: Figure 3