13 results about "Nickel phosphate" patented technology

The invention discloses a niobium-doped and carbon nanotube continuously coated lithium iron nickel phosphate material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The niobium source and the phosphorus source are added step by step, the concentration gradient distribution of the niobium element in the material is realized, and niobium is preferentially doped in the [100] crystal orientation through three-section temperature control sintering, so that the bulk phase conductivity and the lithium ion mobility are remarkably improved, and the capacity loss caused by excessive doping is avoided while the lattice structure is stabilized. In addition, the carbon nanotubes and the nitrogen-containing carbon source have a synergistic effect, Li-N-C covalent bonds are formed on the surface of the material, the interface stability is enhanced, the interface side reaction is effectively inhibited, and the surface conductivity is improved. According to the method, through double modification of doping and coating, the problems of low conductivity and poor cycling stability of the lithium iron nickel phosphate material are successfully solved, and the final product shows excellent rate capability and long cycle life.

The present invention relates to ternary lithium nickel phosphate glasses and a process for their production. The invention also relates to the preparation and use of said glasses as active materials for positive electrodes, particularly in metal-ion batteries, as well as to said active materials and electrodes per se. (no figure)

The invention relates to a preparation method of lotus seedpod-based activated carbon with improved low-temperature adsorbability, which comprises the following steps: (S1) crushing lotus seedpod, washing with water, and drying to obtain lotus seedpod powder; (S2) the lotus seedpod powder is added into steeping liquor, steeping activation is conducted at the temperature of 80-100 DEG C in a closed state, and the steeping liquor is a mixed aqueous solution prepared from phosphoric acid, nickel-bipyridine complex salt and a non-ionic surface active agent according to the mass ratio of 100: (15-25): (1-3); after dipping activation is finished, adding a thiol reducing agent, and then performing freeze drying to obtain a precursor; and (S3) carbonizing, washing and drying the precursor in an inert atmosphere to obtain the lotus seedpod-based activated carbon with improved low-temperature adsorbability. The prepared lotus seedpod-based activated carbon overcomes the problems that active sites of a traditional material are easy to agglomerate and sensitive to temperature, shows excellent low-temperature adsorption characteristics, and is suitable for efficient adsorption of cadmium heavy metal ions in water in a low-temperature environment.

The invention belongs to the field of inorganic functional materials, and particularly relates to a basic nickel carbonate modified material and a preparation method thereof.The method comprises the steps that nickel nitrate hexahydrate is dissolved in deionized water, urea and cetyltrimethylammonium bromide are added, the mixture is heated and stirred mildly, and stirring is performed to obtain a basic nickel carbonate modified material; then adding a specially-made polyaminophenylboronic acid nickel complex and a cobalt-nickel phosphate ethanediamine hybrid material, performing ultrasonic dispersion to form a mixed solution, and then performing hydrothermal reaction, centrifugal washing and vacuum drying to obtain a final product. The two special modified compounds are respectively prepared through a coordination reaction regulated by ammonia water and a hybridization reaction under high-temperature and high-pressure conditions. The modified material prepared by the method has a unique microstructure and enhanced physical and chemical properties, shows excellent application prospects in the fields of electrochemical energy storage, electro-catalytic water and environmental remediation, and particularly, the comprehensive performance of the material is remarkably improved due to the high specific surface area, abundant active sites and a stable structure.

The application belongs to the technical field of water electrolysis hydrogen evolution in neutral solution, and provides a preparation method of copper@molybdenum modified nickel phosphate nanorod array. The material is a core-shell structure nanorod array obtained by depositing molybdenum modified nickel phosphate on copper nanowire. The nanorod array is prepared by combining the preparation processes of immersion method, electro-reduction method and electrodeposition method. The addition of molybdenum and the nanorod structure can effectively improve the conductivity of the catalyst, improve the electron transfer capacity, increase the number of exposed active sites of the catalyst, and promote the hydrogen evolution activity of the catalyst in the neutral solution. When the current density is 10 and 100 mA / cm 2 , the minimum overpotential required for water electrolysis hydrogen evolution is 35 and 195 mV, respectively, which is much lower than that of the hydrogen evolution electrocatalyst prepared by directly loading molybdenum modified nickel phosphate on the surface of the copper foam without molybdenum modification. At the same time, when the current density is -10 mA / cm 2 , the catalyst can be stably operated for at least 25 hours.

The present invention relates to a method for treating mechanical parts (2, 3) having a functional surface (8) made of NiP intended to be in frictional contact with another functional surface, the method comprising the step of oxidizing and / or phosphate-chloriding the functional surface (8) in order to artificially form an oxide layer (9) and / or a phosphate layer (10) on the functional surface (8), the phosphate layer (10) being a layer of nickel phosphate or zinc phosphate.

MULTI-COMPONENT CORROSION INHIBITOR MIXTURE FOR FILM-FORMING BINDERS INTENDED TO PROTECT METALLIC SUBSTRATES. A corrosion inhibitor composition comprises at least two metal polycarboxylate salts and at least one non-lithium metal phosphate salt. The metal polycarboxylate salts may be citrates and / or oxalates. The non-lithium metal phosphate salts may be nickel phosphate or aluminum phosphate.

The invention discloses a preparation method of a lithium nickel phosphate coated lithium nickel manganese oxide positive electrode material, which comprises the following steps: uniformly mixing a lithium nickel manganese oxide precursor and a lithium source, sintering to obtain lithium nickel manganese oxide single crystal particles, mixing the lithium nickel manganese oxide single crystal particles with a phosphate solution to form a nickel-containing phosphate sediment, and carrying out secondary sintering in a protective atmosphere to obtain the lithium nickel phosphate coated lithium nickel manganese oxide positive electrode material. The lithium nickel manganese oxide positive electrode material coated with the lithium nickel phosphate is obtained. According to the method, the initial capacity and the cycle performance of the lithium nickel phosphate coated lithium nickel manganese oxide positive electrode material can be improved, and the preparation method is simple in step, wide in material source, low in cost and more beneficial to popularization and application in production practice.

Provided in the present application are a composite-coated positive electrode material and a preparation method therefor, a positive electrode sheet, a lithium-ion battery and an electric device. The composite-coated positive electrode material comprises an inner core, a first coating layer that coats at least part of the surface of the inner core, and a second coating layer that coats at least part of the surface of the first coating layer, wherein the inner core comprises a lithium nickel manganese oxide; the first coating layer comprises a first coating material, the first coating material comprises one or more of nickel phosphate, manganese phosphate, lithium phosphate, lithium nickel phosphate and lithium manganese phosphate, the first coating material further comprises aluminum, and at least some aluminum atoms occupy nickel sites and / or manganese sites in the crystal structure of the lithium nickel manganese oxide; and the second coating layer comprises a second coating material, and the second coating material comprises lithium phosphate and at least one of lithium metaaluminate and aluminum oxide. The prepared positive electrode material has relatively high capacity and good cycle performance.

Corrosion inhibitor mixes comprising multiple salts. One mix includes zinc citrate, zinc oxalate and magnesium phosphate. A second mix includes the same two zinc salts, nickel oxalate and nickel phosphate. Either mix may be added to a film-forming binder such as a polymer suitable for a paint or primer, to inhibit corrosion, especially when used with a metallic substrate. The resulting product of the inhibitor mix and binder is especially useful in inhibiting corrosion when applied to an aircraft surface.

This invention discloses a high-voltage, high-rate lithium nickel manganese oxide cathode material and its preparation method, comprising the following steps: S1, weighing yttrium source, nickel source, and manganese source according to the stoichiometric ratio of Y:Ni:Mn, dissolving the three raw materials in water respectively, adding yttrium source aqueous solution, nickel source aqueous solution, and manganese source aqueous solution dropwise to citric acid aqueous solution, microwave-assisted heating to control the temperature of the solution at 60℃-80℃, stirring for a period of time, adding sodium bicarbonate aqueous solution and ammonia water to control the pH to 7-8, co-precipitating for a period of time, and then filtering, drying, and ball milling to obtain a preliminary yttrium-doped lithium nickel manganese oxide precursor; S2, mixing the precursor obtained in step S1 with a lithium source, and then calcining, annealing, and pulverizing to obtain a primary lithium nickel manganese oxide cathode material; S3, ball milling nickel phosphate and manganese phosphate into nanoparticles, uniformly coating the surface of the primary lithium nickel manganese oxide cathode material by spray drying, and then drying, calcining, annealing, pulverizing, sieving, and demagnetizing to obtain the lithium nickel manganese oxide cathode material.

The present invention relates to binary nickel phosphate glasses and a process for their production. The invention also relates to the preparation and use of said glasses as active materials for positive electrodes, particularly in metal-ion batteries, as well as to said active materials and electrodes per se. (no figure)

The present disclosure belongs to the field of battery materials, and discloses a coated nickel-rich ternary material and a preparation method and application thereof. The coated nickel-rich ternary material has a chemical formula of LiNixCoyMnzO2·a[M3(PO4)2·bH2O], Where 0.6≤x≤0.8, 0.1≤y≤0.2, 0.1≤z≤0.2, x+y+z=1, 0.01≤a≤0.03, 3≤b≤8, M3(PO4)2·bH2O is at least one selected from the group consisting of nickel phosphate, cobalt phosphate and manganese phosphate; the coated nickel-rich ternary material has a flower-like structure. The preparation method of the present disclosure provides phosphate ions through the prepared phosphate solution, performs coating in a liquid phase environment, and synthesizes the precursor simultaneously by microwave hydrothermal synthesis, which is beneficial to the full contact between the phosphates and the precursor, and ensures the surface of the nickel-rich ternary precursor is uniformly coated with the phosphates. The method is simple and has good coating effect.