170results about "Nickel oxides/hydroxides" patented technology

The invention relates to the technical field of wave-absorbing materials, in particular to a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material. The invention provides a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material, which comprises the following steps of: etching titanium aluminum carbide powder through a LiF / HCl mixture, and performing ultrasonic stripping to prepare a uniform dispersion of MXene nanosheets; the preparation method comprises the following steps: dispersing MXene nanosheets in a solution of water and absolute ethyl alcohol, and adding a pyrrole monomer and a FeCl3. 6H2O aqueous solution for reaction; after the reaction, washing is performed to obtain a PPy-MXene composite material; the preparation method comprises the following steps: by taking NiCl2. 6H2O as a nickel source and sodium oxalate as a precipitator, preparing NiO nanowires by adopting a hydrothermal method combined with a calcining process; the invention discloses a preparation method of an MXene-NiO-PPy ternary composite wave-absorbing material.According to the method, the MXene-NiO-PPy ternary composite wave-absorbing material with rich heterogeneous interfaces and a porous micro-nano structure is constructed, cooperation of dielectric loss, magnetic loss and interface polarization loss is achieved, and finally the light, efficient and broadband wave-absorbing performance is obtained.

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

A positive electrode active material may include a first positive electrode active material comprising a first lithium transition metal composite oxide and having an average particle diameter D50 from 9 µm to 20 µm and may comprise a second positive electrode active material comprising a second lithium transition metal composite oxide and having an average particle diameter D50 from 1 µm to 8 µm. A particle diameter D20 of the positive electrode active material may be from 1.0 µm to 5.0 µm.

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

An active material for a positive electrode comprises tertiary particles (3). Each of the tertiary particles (3) comprises secondary particles (2). Each of the secondary particles (2) comprises primary particles (1). Each of the primary particles (1) comprises lithium manganese iron phosphate.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

Method for producing electronic grade nickel sulfate from nickel powder, crystallization apparatus, and control thereof The present invention provides a method for producing nickel sulfate, and nickel sulfate produced thereby. The process includes acid leaching, copper removal, acid adjustment, concentration, cooling crystallization, drying and sieving, and secondary leaching. Oxidation In the calcination furnace, the temperature is 400 to 700°C, and 1 kg of compressed air is used for each kilogram of nickel powder. ~5m 3 The reaction time is 1.0 to 2.5 hours, and the temperature during acid immersion is controlled to 45 to 70°C. Then, add dilute sulfuric acid to control the pH to 0.5-1.5 and react for 1-3 hours. The copper removal is to replace the copper with nickel powder, and the acid conditioning is to use nickel hydroxide or The pH is adjusted to 2.5-4.5 using nickel carbonate, and the filtrate is concentrated by The cooling crystallization method is to obtain nickel sulfate crystals and return the mother liquor to the concentrate. Drying and sieving is to add the undersieved material to the crystallizer as seed crystals, and secondary leaching is to Dilute sulfuric acid is added to the leaching slag, and it is reacted with nickel sulfate or hydrogen peroxide until nickel is less than 0.1%. If the first stage is full, the second leaching is continued. The crystallizer is a crystallizer that is connected in series with a second-stage crystallizer and a third-stage crystallizer. A crystallization frame, an oscillator provided under the crystallization frame, and an oscillator provided at the exit end of the crystallization frame. The crystallization frame is a rectangular parallelepiped. The bottom of the ribs are evenly spaced, with a cross section of a circular arc. The distance between two adjacent ribs is S is 1 / 25 to 1 / 15 of the width of the crystallization frame, and either the width b or the height h of the rib The width of the crystallization frame is 1 / 100 to 1 / 150 of the width of the crystallization frame. It does not add any new impurity ions, and does not add any oxidizing agent. The nickel sulfate crystal particles produced are uniform and are free of the static generation. This avoids caking of very large particles, irregularly shaped particles and crystals.

The invention discloses a method for preparing vinyl chloride by electrocatalytic dechlorination of 1, 2-dichloroethane, a working electrode of the method takes a metal oxide as a catalyst, and the metal oxide is selected from at least one of the following metal oxides: Pd, Mn, Fe, Co, Ni, Cu, Ru and Mo. According to the invention, the metal oxide powder is used as the electrocatalyst, the catalyst is coated on the electrode material to prepare the working electrode, the working electrode is applied to electrocatalytic dechlorination reaction of 1, 2-dichloroethane, vinyl chloride can be generated at high selectivity at room temperature, a new way is opened up for production of vinyl chloride by electrocatalytic dechlorination, and the method has wide application prospect. And a green and low-cost solution is provided for efficient synthesis of vinyl chloride.

The invention provides a functional layer solid-phase precursor, a fuel electrode, a preparation method of the functional layer solid-phase precursor, a preparation method of the fuel electrode, a solid oxide fuel cell or an electrolytic tank, and belongs to the technical field of functional materials. The functional layer solid-phase precursor provided by the invention is obtained by solid-phase synthesis of raw materials including a NiO solid-phase precursor and first gadolinium-doped cerium oxide, and the mass ratio of the NiO solid-phase precursor to the first gadolinium-doped cerium oxide is (7-12): 1; the NiO solid-phase precursor is obtained by sol-gelation and first calcination of a mixed aqueous solution containing Ni salt, a pore forming agent and a chelating agent. The functional layer solid-phase precursor provided by the invention can be used for preparing a fuel electrode with high conductivity, and the fuel electrode is suitable for a solid oxide fuel cell or an electrolytic tank and has excellent electrochemical performance.

The present invention relates to a cathode active material precursor that can realize a cathode active material in a single particle form even when heat-treated at a low temperature, and specifically relates to a cathode active material precursor including one or more selected from a first cathode active material precursor having a composition represented by Chemical Formula 1 described in the present specification and containing a composite transition metal in a single particle form, a second cathode active material precursor having a composition represented by Chemical Formula 2 described in the present specification, and a third cathode active material precursor having a composition represented by Chemical Formula 3 described in the present specification, a method for producing a cathode active material using the same, and a cathode active material produced thereby.

Provided is a positive electrode active material that has improved charge / discharge cycle characteristics at a high capacity of a non-aqueous electrolyte secondary battery. The positive electrode active material that is included in the non-aqueous electrolyte secondary battery includes a lithium transition metal composite oxide, said lithium transition metal composite oxide containing Ni and Sr, and including secondary particles that are formed by flocculation of primary particles. In an element concentration distribution of a cross-section of the lithium transition metal composite oxide that is obtained using time-of-flight secondary ion mass spectrometry, the Gini coefficient of Sr on the secondary particle surface is 0.85 or less, the Gini coefficient of Sr in the secondary particle interior is 0.7 or less, and the ratio ISr_OUT / ISr_IN of the standardized strength ISr_OUT of the Sr on the secondary particle surface to the standardized strength ISr_IN of the Sr in the secondary particle interior is 1-5 inclusive.

To provide a method that can perform a process from generating clean treated water at a level that can be discharged to discharging the treated water at a low cost for the treated water containing sodium hypochlorite, and a catalyst suitable for the method.SOLUTION: A production method for composite powder comprises: stirring and mixing nickel oxide (II) powder in water in the presence of nickel ions and an oxidizing agent to produce a composite nickel oxide powder; and ozonating the composite nickel oxide powder in the water at pH 9-13 at 60-90°C in the presence of iron ions (II).SELECTED DRAWING: None

The objective is to provide titanium dioxide-containing nanoparticles that can achieve excellent power conversion efficiency (PCE), a dispersion containing the nanoparticles, a thin film containing the nanoparticles, and a photoelectric conversion element that includes the nanoparticles in a hole transport layer. [Solution] The nanoparticles of the present invention are nickel oxide nanoparticles, having a particle size smaller than 20 nm, a nickel valency of 2.1 or more and 2.4 or less, and an electrical resistivity of 2.0 × 10⁻⁶ 5 The nanoparticles of the present invention are characterized by having a density of Ω·cm or less. Preferably, the transmittance of the nanoparticles of the present invention is higher than 90% in the wavelength band of 380 nm to 400 nm. Preferably, the nanoparticles of the present invention are used in the hole transport layer of a perovskite solar cell.

An electrochemical device includes a positive electrode plate. The positive electrode plate includes a positive active material layer. The positive active material layer includes a positive active material. After the electrochemical device is discharged, a molar fraction of an M1 element in the positive active material included in the positive electrode plate in a fully discharged state is a. The M1 element includes Ni, Co, and Mn. A molar fraction of Ni in the positive active material is b. A molar fraction of Mn in the positive active material is c. A molar fraction of an M2 element in the positive active material is d. The M2 element includes at least one of Na, K, or Mg. The value of b / a is 0.4 to 0.6, the value of c / a is 0.4 to 0.6, and the value of d / a is 0.04 to 0.06.

A method of preparing a metal oxide nanoparticle represented by Formula 1 includes: forming a first composition including a nickel-containing precursor and an M-containing precursor, and heat-treating the first composition, wherein the M-containing precursor includes at least one halogen element:         Formula 1     Ni1-xMxO wherein, in Formula 1, x satisfies the condition of 0 <x<1, and M includes at least one metal element.

The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

A novel photocatalyst Bi2WO6 / NiO / Ag with hierarchical flower-like Z-scheme heterojunction, which exhibited excellent stability and photocatalytic activity over a wide light spectrum, was synthesized. The as-prepared composites were used in the remediation of real oil sands process water (OSPW) and achieved complete removal of aromatics, classical naphthenic acids (NAs). and heteroatomic NAs after 6 h of photocatalytic treatment. The acute toxicity of OSPW was completely eliminated after only 2 hours of treatment. h+, ·OH and O2·—were found to be the major oxidative species in the photocatalytic system. The enhanced photocatalytic efficiency is the result of the unique Z-scheme electron transfer among electron mediator Ag, NiO, and Bi2WO6 and the SPR effect near Ag, which was supported by the DFT calculations of the electronic properties of Bi2WO6 / NiO / Ag heterostructure.

A cathode active material precursor for a lithium secondary battery has a structure of a nickel composite hydroxide. A first peak intensity ratio represented by Equation 1 is 0.5 or more, and a second peak intensity ratio represented by Equation 2 is 0.7 or more. A cathode active material and a lithium secondary battery having a stabilized crystal structure are provided using the cathode active material precursor.

This invention discloses a hydrangea-like NiO@NiMoO4 composite material and its preparation and application, which belongs to the technical field of hydrogen storage materials. This application utilizes a comprehensive combination of hydrothermal, calcination, and ball milling techniques to produce the composite material. The resulting material exhibits a microscopic hydrangea-like spherical morphology with particle diameters of 2-3 μm. When this material was blended with MgH2 to form an MgH2+10 wt% NiO@NiMoO4 composite hydrogen storage material, it began to release hydrogen at 190°C and rapidly released 6.44 wt% H2 within 4.5 min at 300°C, achieving 99.4% of the theoretical hydrogen release amount. This demonstrates that this composite hydrogen storage material has good low-temperature hydrogen storage / desorption mechanical properties, a high hydrogen storage / desorption capacity, and good cycling stability. Overall, this material has great prospects for application in hydrogen storage and may provide a new concept for the research and development of hydrogen storage materials.

The invention discloses a foamed nickel loaded (NiO) 0.75 (MnO) 0.25 porous nanosheet solid solution electrode material and a preparation method and application thereof, relates to the field of material science, nanotechnology and new energy, and utilizes in-situ diffusion and lattice reconstruction of a NiO / Mn3O4 heterojunction obtained by microwave-assisted hydrothermal treatment in a medium-high temperature heat treatment process under specific conditions to prepare a porous nanosheet solid solution electrode material. According to the preparation method, a two-dimensional nanosheet array structure which is uniformly arranged and mutually connected can be induced and converted into a (NiO) 0.75 (MnO) 0.25 porous nanosheet solid solution with a highly porous and uniformly arranged and connected two-dimensional nanosheet array structure, so that the electrochemical accessible surface area is effectively increased, and the charge transfer kinetics is accelerated; therefore, high specific capacity, wide voltage window and excellent cycle durability are shown in an alkaline-condition water system supercapacitor. The method is simple in process, good in repeatability and suitable for large-scale preparation of the high-performance alkaline aqueous supercapacitor electrode material.

A process for preparing metal oxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum. The process comprising:reacting a metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum with lithium hydroxide and optionally a chelating agent to obtain a solid comprising a metal hydroxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum, and a liquid comprising lithium sulfate, the metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum;separating the liquid and the solid from one another to obtain the metal hydroxide;submitting the liquid comprising lithium sulfate to an electromembrane process for converting the lithium sulfate into lithium hydroxide; andreusing at least a first portion of said lithium hydroxide obtained by the electromembrane process for reacting with the metal sulfate;reacting at least a second portion of said lithium hydroxide obtained by the electromembrane process with the obtained metal hydroxide to obtain a mixture of metal hydroxides; androasting said mixture of metal hydroxides to obtain the metal oxide.

To provide: a manufacturing method of inorganic powder using a chemical vapor phase synthetic method, which is capable of increasing a manufacturing yield by suppressing a side reaction, and of increasing stability of continuous steps by preventing a reaction vessel from being closed; and a manufacturing device thereof.SOLUTION: A manufacturing method of inorganic powder using a chemical vapor phase synthetic method according to one embodiment of the present invention comprises the steps of: feeding a precursor; feeding a side reaction prevention gas for preventing a side reaction of the precursor to the precursor; feeding a reaction gas to the precursor; and forming inorganic powder by chemically reacting the precursor with the reaction gas.SELECTED DRAWING: Figure 3

The invention relates to a surface-passivated nickel oxide nano-particle and a preparation method and application thereof, and belongs to the technical field of photoelectric application, the molecular formula of the surface-passivated nickel oxide nano-particle is Ni (OxSyClz), in the formula, y / xlt; 0.1, z / xlt; 0.1 gt, 1.5 gt; x + y + zgt; 1. According to the preparation method disclosed by the invention, the nickel oxide nanoparticles with uniform particle size and passivated surface defects are obtained through continuous and multi-step processing treatment. The surface-passivated nickel oxide nanoparticles are applied to solar cell modules, photoelectric sensors or photoelectric converters.

The present invention provides a method for producing a positive electrode active material for alkali ion secondary batteries, the positive electrode active material containing a large amount of a transition metal, while enabling a battery to operate.　A method for producing a positive electrode active material for alkali ion secondary batteries, the positive electrode active material containing 34% by mole or more of CrO + FeO + MnO + CoO + NiO. This method for producing a positive electrode active material for alkali ion secondary batteries is characterized by comprising: a step for preparing a positive electrode active material precursor that contains crystals; and a step wherein at least some of the crystals are melted and amorphized by irradiating the positive electrode active material precursor with light.

A method for preparing a single-particle type positive electrode active material precursor includes (a) mixing a nickel-based hydroxide and an inactive lithium salt to prepare a mixture; and (b) performing a first heat treatment on the mixture to obtain a nickel-based oxide in a form of single particles. According to some example embodiments, a positive electrode active material precursor and a method for preparing the same, and a method for preparing a positive electrode active material including the same minimize or reduce the production process, thereby ensuring long cycle-life characteristics and improving high-temperature storage characteristics. A rechargeable lithium battery using the positive electrode active material can exhibit high initial charging and discharging capacity and efficiency, and can implement long cycle-life characteristics.

This proposes a minimum core radius for nickel-based metal hydroxide particles having a core-shell gradient (CSG) in which a concentration of nickel in a core portion is constantly maintained and a concentration of nickel in a shell portion is sharply decreased.

The application discloses a kind of NiO hollow microspheres with OER electrocatalytic activity, which is prepared by Mist-CVD method and the average diameter is less than 1.5 µm. The application also discloses a preparation method of the NiO hollow microspheres with OER electrocatalytic activity. The nickel salt and ethanolamine complexing agent (ETA) are dissolved in deionized water to prepare a mixed precursor solution, and the Mist-CVD method is used for preparation to obtain the NiO hollow microspheres with OER electrocatalytic activity. The NiO hollow microspheres with OER electrocatalytic activity and the preparation method thereof use nickel salt and ethanolamine complexing agent (ETA) as mixed precursors, and the Mist-CVD method is used to prepare the NiO hollow microspheres with high OER activity. This method has the advantages of simple process, low raw material cost, mass production, and relatively friendly to the environment.

The present application discloses a nickel-cobalt-manganese ternary positive electrode material nanorod and the use thereof. The chemical general formula of the nickel-cobalt-manganese ternary positive electrode material nanorod is LiNi1-x-y-zCoxMnyAlzO2, where 0<x<1, 0<y<1, and 0≤z≤0.05; the nickel-cobalt-manganese ternary positive electrode material nanorod has a section diameter of 50-200 nm and a length of 0.1-5 μm. In the present application, a mixed metal salt solution of nickel, cobalt, manganese, aluminum and lithium and 8-hydroxyquinoline are subjected to complex-precipitation to generate a precipitate containing nickel, cobalt, manganese, aluminum and lithium, and then the precipitate is calcined to prepare a ternary positive electrode material nanorod. Unlike traditional processes, no ammonia-nitrogen wastewater is generated in the whole process, and an alcohol used in the process can be directly recovered by means of evaporation and condensation, such that the process is environment-friendly.

The invention relates to nickel oxide nanoparticles prepared based on a low-temperature chemical precipitation method and application of the nickel oxide nanoparticles in an inverted perovskite solar cell, and belongs to the technical field of perovskite solar cells. According to the nickel oxide nanoparticles prepared through the low-temperature chemical precipitation preparation method of the nickel oxide nanoparticles, the impurity content (such as NO3 <-> and CO3 < 2->), the ion ratio (such as the ratio of Ni < 3 + > to Ni < 2 + >), the particle size and the dispersity are regulated and controlled through low-temperature control, and then the conductivity, the hole mobility and the surface active sites of a nickel oxide film are regulated and controlled; and finally, the charge transmission performance of the nickel oxide film is improved. Nickel oxide (NiOx) nanoparticles prepared by a low-temperature chemical precipitation method increase the coverage rate of self-assembled molecules on the nanoparticles, promote perovskite crystallization, and improve interface contact between a hole transport layer and a perovskite layer, thereby improving the long-term stability of a buried interface and a device.