152results about "Chromium compounds" patented technology

The invention discloses a preparation method of a layered oxide material sodium chromite for a sodium-ion battery, which comprises the following steps: directly mixing a reducing sodium source and a hexavalent chromium source as raw materials, and carrying out solid-phase oxidation-reduction reaction to prepare the layered oxide material sodium chromite for the sodium-ion battery. The preparation method of the layered oxide material sodium chromite of the sodium ion battery has the characteristics of simple process and excellent electrochemical performance.

The invention provides a method for preparing an iron-chromium electrolyte and electronic-grade ferrous chloride by using a stainless steel waste liquid. The method comprises the following steps: firstly, adding elemental iron and / or elemental chromium into the stainless steel waste liquid to obtain a chromium-containing ferrous chloride solution; then, sulfide is added, and nickel is removed; adding iron powder to increase the pH value to obtain chromium hydroxide precipitate and a ferrous chloride solution; dissolving chromic hydroxide in hydrochloric acid to obtain a chromic chloride solution; purifying the ferrous chloride solution to obtain an electronic-grade ferrous chloride crystal; and finally, adding a chromium chloride solution, the electronic-grade ferrous chloride crystal and hydrochloric acid according to a certain proportion, and stirring and mixing to obtain the iron-chromium electrolyte. The ferrous chloride prepared by the steps is relatively high in purity and less in waste; meanwhile, the prepared electrolyte is good in electrical property, low in attenuation rate and low in cost, the purpose of comprehensive recycling of resources is achieved, and the general trend of technical improvement is met.

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a metal organic framework packaged polyoxometallate coated ternary positive electrode material and a preparation method thereof. The preparation method of the ternary positive electrode material comprises the following steps: a) preparing metal A salt into a metal A salt solution; the preparation method comprises the following steps: preparing an ammonium molybdate compound into an ammonium molybdate compound solution, heating the ammonium molybdate compound solution to boiling, dropwise adding a metal A salt solution, and after dropwise adding, carrying out a constant-temperature reaction, filtering and recrystallizing to obtain Anderson type polyoxometallate; b) dissolving Anderson type polyoxometallate, a metal B salt and an organic ligand in water, and reacting at a certain temperature to obtain polyoxometallate packaged by a metal organic framework; and c) mixing a positive electrode material and the polyoxometallate packaged by the metal organic framework prepared in the step b) according to a ratio, and carrying out ball milling to obtain the ternary positive electrode material coated by the polyoxometallate packaged by the metal organic framework.

The purpose of the present invention is to provide: a copper-chromium oxide spinel having excellent dispersibility in a resin composition and excellent adhesion to plating; a resin composition containing the copper-chromium oxide spinel; and a resin molded article. Specifically, provided is a copper-chromium oxide spinel in which, in the particle size distribution obtained by a laser diffraction scattering method in terms of volume, when the particle sizes with cumulative frequencies of 10%, 50%, and 90% from the small particle size side are D10, D50, and D90, respectively, the extension of the particle size distribution SPAN = (D90-D10) / D50 is 2 or less.

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 belongs to the technical field of micro-nano composite materials, and particularly relates to a chromium-based bimetallic sulfide-porous carbon composite material and a preparation method and application thereof. The preparation method of the chromium-based bimetallic sulfide-porous carbon composite material provided by the invention comprises the following steps: mixing chromium salt and zinc salt, or chromium salt and manganese salt with a sulfur source, sodium gluconate and a pore-forming agent, and preparing the composite material through heat treatment and vulcanization technologies. The chromium-zinc or chromium-manganese bimetallic sulfide-porous carbon composite material prepared by the preparation method has good structural stability and conductivity, and the cycling stability of a battery can be remarkably improved when the chromium-zinc or chromium-manganese bimetallic sulfide-porous carbon composite material is used as a battery material. The prepared chromium-based bimetallic sulfide-porous carbon composite material has important application value in the field of lithium ion battery electrode materials.

The invention relates to a modified lithium ion positive electrode material, a manufacturing method thereof and a lithium ion battery. The invention provides a modified lithium ion positive electrode material which comprises a positive electrode material body and a surface coating layer, the chemical composition of the surface coating layer is high-entropy solid electrolyte Li < 7 > La < 3 > (M < x > M < 1 > a M < 2 > b M < 3 > c... Mij) 2O12, M is Zr or Ti, and x is greater than 0; m1, M2, M3... Mi are elements other than Li, La, Zr and Ti, i is a positive integer, 5 < = i < = 10, a, b, c... j are stoichiometric coefficients of the elements, a, b, c... j > = 0, and x + a + b + c +... + j = 1. The high entropy of the solid electrolyte is realized, so that the ionic conductivity at the interface is further improved, and the problem of energy density reduction caused by surface coating is further solved through lithium enrichment.

Provided is a conductive paste for an internal electrode of a layered ceramic capacitor, said conductive paste being capable of maintaining relatively high coverage even if the internal electrode constitutes a thin layer.　The conductive paste is for forming an internal electrode (4, 5) of a layered ceramic capacitor (1) fabricated through a firing step and comprises a conductive metal powder, a ceramic powder, an organic solvent, and an organic binder. The conductive metal powder contains copper. At least a portion of the ceramic powder consists of an ABO3 type oxide having a specific ion radius in which the ratio of the ion radius in the 6-coordination of the element at the A site in ABO3 with respect to the ion radius in the 6-coordination of copper is 0.96-1.04.

A niobium-containing oxide powder that satisfies the following formula (I), wherein, in the following formula (I), when x=0 and y=0, the specific surface area of ​​the niobium-containing oxide powder is 2.3 m 2 / g or more 10m 2 / g or less. A a Ti 2-x M 1 x Nb 14-y M 2 y O 39±z (I) [During the ceremony, A is at least one element selected from the group consisting of Li and Na; M 1 is M IV , (M III 0.5+v M V 0.5-v ), (M V 0.67+v M II 0.33-v ), (M III 0.67+v M VI 0.33-v ), and (M II 0.5+v M VI 0.5-v ) selected from the group consisting of M 2 is M V , (M IV 0.5+w M VI 0.5-w ), (M VI 0.67+w M III 0.33-w ), and (M VI 0.75+w M II 0.25-w ) selected from the group consisting of M II are each independently at least one divalent metallic element, M III are each independently at least one trivalent metallic element; M IVare each independently at least one tetravalent metallic element; M V are each independently at least one pentavalent metallic element; M VI are each independently at least one hexavalent metallic element; 0≦a≦6, -0.05≦v≦0.05, -0.05≦w≦0.05, 0≦x<2, 0≦y<14, 0≦z≦1.

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 invention provides an electrochemical cell, such as a lithium-ion battery, comprising an anode, a cathode, and an electrolyte disposed between the anode and cathode; wherein the anode comprises an oxide comprising niobium as an active anode material, wherein the crystal structure of the oxide comprising niobium corresponds to the crystal structure of MII 2Nb34O87, MIIINb11O29, MIIINb49O124, MIVNb24O62, MVNb9O25, MVINb12O33, H-Nb2O5, or N-Nb2O5; wherein the cell has an N / P ratio >1 as defined in the specification.

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.

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.

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

The present invention provides a method for preparing a rare earth-site-modified hydrotalcite-based oxygen evolution catalyst. The preparation method comprises the following steps: constructing a hydrotalcite precursor with selective metal vacancies by hydrothermal-alkali etching, and then introducing rare earth elements into the hydrotalcite precursor at specific points to obtain a rare earth-precisely modified hydrotalcite-based oxygen evolution catalyst. The hydrotalcite-based oxygen evolution catalyst of the present invention has a stable structure, abundant active sites, excellent oxygen evolution catalytic performance and stability, and has a prospect for large-scale promotion and application.

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 present invention provides a method for resource recovery of chromium-containing electroplating sludge, including the process steps of pigment preparation and metal recovery. Among them, the ceramic pigment is prepared by a solid-phase method using chromium-containing electroplating sludge and calcium-silicon substances as raw materials. The waste liquid generated during the preparation process realizes the cascade recovery of metals through the methods of adding iron powder to reduce and precipitate copper, hydrogen peroxide to oxidize and precipitate iron, and reduction and flocculation to precipitate chromium. The recovered chromium hydroxide can be returned to the raw material electroplating sludge for secondary utilization. The present invention prepares a ceramic pigment with good color rendering effect and excellent acid and alkali resistance through a simple solid-phase reaction method. Moreover, the purity of the grossularite phase Ca3Cr2(SiO4)3 is relatively high, with stable properties, acid and alkali resistance, and at the same time realizes the cascade recovery of metals. The present invention realizes the resource utilization of chromium-containing sludge, a solid hazardous waste, in the field of ceramic pigments. The process is simple, easy to control, environmentally friendly, and the raw materials are cheap and easily available, greatly reducing the production cost and having good economic and environmental benefits.

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 high near infrared reflection inorganic pigment based on non-coloring ion doping and a preparation method and application thereof, the chemical general formula of the pigment is Ba (Mg, B, C, Ti) 12O19, the element B is a coloring ion, and the element C is a non-coloring ion. The method is mainly based on doping of non-coloring ions, the structure and the refractive index of the pigment are changed, and the near-infrared reflection pigment can be prepared by adopting three different methods as required, namely a solid phase method, a combustion synthesis method and a coprecipitation method. Compared with the prior art, the inorganic pigment powder which is low in toxic element content, deep in color, high in near-infrared reflectivity and excellent in heat insulation performance is obtained through a preparation technology which is low in cost, simple in technology and adjustable in color, and the inorganic pigment powder can be widely applied to the fields of building outer wall heat insulation coatings, paint and the like.

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.