352results about "Nickel oxides/hydroxides" patented technology

The invention discloses a lithium iron manganese phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the lithium iron manganese phosphate positive electrode material at least comprises lithium iron manganese phosphate particles and a coating layer coating the lithium iron manganese phosphate particles; the raw material of the coating layer comprises an aluminum fluoride embedded poly (ethylenedioxythiophene)-lithium polystyrene sulfonate compound. And the coating layer can be used as a physical barrier to form dynamic interface protection, so that dissolution of manganese and erosion of electrolyte are directly inhibited, and side reaction between the electrolyte and the positive electrode material is reduced. Meanwhile, a more flexible transmission channel is provided for lithium ions and electrons, the conductivity of the positive electrode material is enhanced while the transmission efficiency of the lithium ions is improved, and the lithium manganese iron phosphate positive electrode material with stable structure, high rate capability and cycling stability is obtained.

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 invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

A particulate nanocomposite material comprising, as determined by X-ray diffraction (XRD): elemental carbon (C); elemental nickel (Ni) in a cubic crystalline phase; a cubic nickel oxide (NiO) crystalline phase; an orthorhombic calcium borate (CaB2O4) crystalline phase; and, a magnesium borate (MgB2O4) crystalline phase. The porous particulate nanocomposite is characterized in that, based on the total number of atoms in the particulate nanocomposite material: the atomic concentration of carbon is from about 1 atomic percent (at. %) to about 10 at. %; the atomic concentration of nickel is from about 1 at. % to about 10 at. %; the atomic concentration of boron (B) is from about 1 at. % to about 10 at. %; the atomic concentration of magnesium (Mg) is from about 5 at. % to about 15 at. %; and, the atomic concentration of calcium (Ca) is from about 1 at. % to about 10 at. %.

The invention provides chlorine-doped nickel oxide, a preparation method and application thereof and a photoelectric device, and relates to the field of photoelectric materials.The preparation method of the chlorine-doped nickel oxide comprises the following steps that S10, an aqueous solution of nickel salt and chlorine salt is obtained, an alkaline solution is dropwise added, centrifugation is conducted, and a coprecipitate is obtained; s20, washing, drying and roasting the coprecipitate to obtain chlorine-doped nickel oxide; wherein the molar ratio of the nickel salt to the chlorine salt is (10-20): (1-4). In the technical scheme provided by the invention, the nickel salt and the chlorine salt are co-precipitated to generate a co-precipitate of nickel hydroxide and chloride, and then the co-precipitate is washed, dried and roasted to prepare the chlorine-doped nickel oxide, so that the hole mobility of the chlorine-doped nickel oxide is improved; the alkaline solution is dropwise added for coprecipitation, so that the particle size of the coprecipitate can be reduced, and the nanoscale chlorine-doped nickel oxide is prepared, so that the dispersity of the chlorine-doped nickel oxide in a mobile phase is improved, and the chlorine-doped nickel oxide can be applied to preparation of a hole transport film and improvement of the uniformity of the hole transport film.

A process for the production of a mixed metal hydroxide material for use as a cathode active material precursor is described, wherein the process utilizes cavitation to produce high quality materials through elimination of some processing steps and ingredients. In particular, a method of producing a mixed metal hydroxide material combining a first metal, a second metal, an oxidant and a liquid to form a reaction slurry is disclosed. The method may include applying cavitation to the liquid prior to the formation of the reaction slurry and / or applying cavitation to the liquid when the liquid is part of the reaction slurry. A method of forming an active material and a mixed metal hydroxide material for use as an active material precursor is also disclosed.

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.

The invention provides a purification method of a metal oxide, a photoelectric device comprising the metal oxide and electronic equipment, in the purification method of the metal oxide, a first amine compound and a second amine compound are sequentially adopted to carry out ligand exchange on the metal oxide, so that the metal oxide is converted into an oil-phase metal oxide, therefore, impurities dissolved in the polar solvent are removed, and the purity of the metal oxide is improved; when the metal oxide prepared by the purification method of the metal oxide is applied to a photoelectric device, the service life of the photoelectric device is prolonged, and the performance stability of the photoelectric device is improved.

The present disclosure relates to a cathode lithium supplement agent, its precursor, preparation method and application, belonging to the technical field of lithium supplement agents. The precursor of the cathode lithium supplement agent includes a core material and a shell material coated on the surface of the core material; the core material is a porous spherical material composed of nanosheets, and the core material contains Ni(OH)2; the shell material contains at least one of an oxide of element M and a hydroxide of element M, and M includes at least one of Mn, Co, Cu, Mg, Ca, Fe, Sr, Al and Ti. The shell material of the precursor adsorbs on the core material, can react with a lithium source at a low temperature to generate a lithium-containing metal oxide to wrap on the surface of the core material, and promotes the reaction of the lithium source with Ni(OH)2 to form a good solid solution, thereby playing a role in reducing the sintering temperature and being beneficial to obtaining a high-purity lithium supplement agent material. The cathode lithium supplement agent prepared from this precursor has low hygroscopicity and high stability.

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.

Example embodiments include positive electrode active materials, manufacturing methods thereof, and rechargeable lithium batteries. The positive electrode active material includes a positive electrode active material having a first particle that has a first surface and a second surface and includes a lithium composite oxide, and a first coating layer on the first surface. A surface area ratio of the first surface to the second surface is in a range of about 3:7 to about 8:2. The first coating layer has a cobalt amount that is greater than a cobalt amount of the first particle. The cobalt amount of the first coating layer is in a range of about 30 at % to about 100 at %.

To provide an electrochemically active cathode material for a battery.SOLUTION: An electrochemically active cathode material includes a non-stoichiometric beta-delithiated layered nickel oxide. The non-stoichiometric beta-delithiated layered nickel oxide has a chemical formula. The chemical formula is LixAyNi1+a-zMzO2*nH2O. In the formula, x is approximately 0.02 to 0.20, y is approximately 0.03 to 0.20, a is approximately 0.02 to 0.2, z is approximately 0 to 0.2, and n is approximately 0 to 1. In the chemical formula, A is an alkali metal. The alkali metal includes potassium, rubidium, cesium, and any combination thereof. In the chemical formula, M comprises an alkaline earth metal, a transition metal, a non-transition metal, and any combination thereof.SELECTED DRAWING: Figure 1

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.

The disclosure relates to methods to prepare metal oxide nanoparticles (MONs) from the cathodes of lithium-ion batteries (LIBs), and related compositions and systems. The MONs can be used to improve the properties of drilling fluids, such as those used in underground drilling methods to produce oil and / or natural gas.

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.

An amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material includes an amorphous Si phase, a cubic Co3O4 phase and a cubic NiO phase. Further, the amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material has a granular morphology with an average grain size in a range from 0.5 to 2.5 μm, where the granular morphology includes nanoscale particles aggregated into the granular morphology. Still further, the nanoscale particles have an average particle diameter in a range from 30 to 90 nm. Furthermore, the amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material has an adsorption capacity for ciprofloxacin of greater than or equal to 170 mg / g.

This invention relates to a method for preparing a highly efficient self-supporting oxygen evolution electrocatalyst using a cation exchange method. It addresses the problems of poor conductivity and limited active sites in existing nickel-iron double hydroxide catalysts. The preparation method includes: 1. Preparing a precursor using a hydrothermal method; 2. Immersing the precursor in a chemical bath. This invention is used to prepare a highly efficient self-supporting oxygen evolution electrocatalyst using a cation exchange method.

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 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 present invention discloses a high-nickel ternary cathode material for lithium-ion batteries, its preparation method, and its application. First, a precursor with an elemental concentration gradient structure prepared by a coprecipitation method is mixed with lithium hydroxide. The concentration gradient sample is then rapidly heated using Joule heat from the powdered sample as a heat source. Through short-term control and ultra-fast heating and cooling rates, the interdiffusion of transition metal elements is suppressed, preserving the elemental concentration gradient structure to the greatest extent possible. The high-nickel ternary cathode material's structural design—a high-nickel core and a low-nickel shell—can reduce electrolyte corrosion and side reactions on the material matrix, further improving the cycle life and safety performance of the high-nickel ternary cathode material.

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.

The present invention belongs to the field of catalyst preparation technology, specifically to a method for preparing a CoNiFe-based catalyst for hydrogen production by water electrolysis. A CoNiFe-based precursor is first calcined to obtain a metal oxide powder, which is then mixed with carbon black and ball-milled before secondary calcination to obtain the CoNiFe-based catalyst. This catalyst is then loaded onto a carbon paper surface as a working electrode to construct a three-electrode system for water electrolysis, exhibiting dual catalytic performance for both OER and HER.