59results about How to "Good lamellar structure" patented technology

The present invention relates to the liquid phase synthesis process of Ni-rich positive pole material LiNi1-yCoyO2, where y is 0.2-0.3, for lithium ion cell, and is especially one sol-gel process. With cheap citric acid as chelating agent, solution of ethanol solvent and the water solution of Li salt, Ni salt and Co salt are mixed and concentrated through heating and stirring to form gel; the gel is dried, thermally decomposed, sintered at high temperature, cooled and ground to obtain the submicron level lithium nickelate-cobalate powder. Compared with available technology, the present invention has the advantages of less organic solvent consumption, short synthesis period, simple apparatus, environment friendship, and homogeneous product with excellent electric performance.

The invention discloses a doped lithium ion battery high-voltage NCA positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping trivalent element aluminum and divalent element cobalt to replace element nickel in a positive electrode material to obtain an NCA precursor,adding a dopant M into the precursor, and sintering in a high-pressure oxygen atmosphere to obtain the lithium ion battery positive electrode material. The positive electrode material disclosed by theinvention has very high specific discharge capacity and excellent cycle stability, can meet the high-rate charge and discharge requirements, and can be safely cycled for a long time under high voltage; the positive electrode material is prepared by combining four solution parallel-flow coprecipitation with a high-pressure solid-phase synthesis method, and the prepared product is high in purity, high in crystallization quality, high in product particle density, uniform in distribution, excellent in electrochemical performance and low in manufacturing cost, is an ideal positive electrode material with high energy density and has a wide application prospect.

The invention discloses an ultrahigh-solid-content and high-durability environment-friendly low-surface-treatment epoxy high-build coating and a preparation method thereof, and relates to the technical field of metal surface anti-corrosion treatment. The preparation method comprises the following steps of: well stirring medium-viscosity epoxy resin, low-viscosity epoxy resin, unsaturated polyester resin, acetone, ethanol, modified zinc phosphate, iron oxide red, aluminum paste, mica iron oxide, filler, an adhesion promoter, a high-efficiency dispersant and other auxiliaries in a stirrer, adjusting the viscosity, and mixing a curing agent before construction. The low-surface-treatment coating prepared by the invention is convenient to construct, realizes green application and green use of the green coating, and is suitable for anti-corrosion maintenance of various steel structures and new steel structures.

The invention provides a positive electrode material, a preparation method thereof and a secondary lithium battery. The positive electrode material is characterized in that the chemical general formula of the positive electrode material is LibNi1-x-yCoxAlyMzO2, b is more than or equal to 0.95 and less than or equal to 1.10, x is more than or equal to 0 and less than or equal to 0.15, y is more than or equal to 0.01 and less than or equal to 0.1, z is more than 0 and less than or equal to 0.05, and the element M is a metal element; M elements are distributed inside and on the surface layer of the positive electrode material, the M elements distributed inside the positive electrode material exist in a doping form, and the M elements distributed on the surface layer of the positive electrode material exist in a coating layer form formed by M oxide and / or lithium M composite oxide; and the molar ratio of the internal M element to the surface layer M element is greater than 0.5. The positive electrode material provided by the invention has good high rate capability and thermal stability.

The invention relates to the technical field of preparation of hydrotalcite-like compounds, and discloses a pure cobalt hydrotalcite-like compound and a preparation method thereof. A constant pH precipitation method is adopted, cobalt nitrate serves as a cobalt source, a mixed solution of methyl alcohol and water (the volume ratio is 1: 1-8: 1) serves as a solvent, the cobalt nitrate solution is slowly dropwise added into a sodium carbonate solution at the room temperature, the pH of the solution is adjusted to be 8-12, and the pure cobalt hydrotalcite is obtained through the steps of hydrothermal aging, suction filtration, washing, drying and the like. The hydrotalcite-like compound is single in crystalline phase, regular in structure and good in layered structure and flaky morphology, the average thickness of nanosheets ranges from 5.9 nm to 12.8 nm, and the high crystallinity degree is achieved. The preparation process is simple and easy to operate, the raw materials are cheap and easy to obtain, the preparation conditions are mild, the period is short, the purity and the yield of the hydrotalcite-like compound are high, and quantitative synthesis can be realized.

The invention discloses a nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer and a preparation method and application thereof. The preparation method comprises the steps that shrimp shell pretreatment is conducted, by taking urea or melamine or pyrrole as a nitrogen source and taking shrimp shells subjected to treatment as a raw material, under inert gas flow, low-temperature pre-carbonization is conducted, then, high-temperature pyrolysis is conducted with alkaline matter, acid treatment is conducted at last, and the nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer is obtained. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer prepared through the method has a unique nano ultrathin carbon layer structure, a high specific surface area and a total pore volume, is simple in technology, low in cost, friendly to environment, and has good physical and chemical properties. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer can be applied to a supercapacitor, a secondary battery and gas absorption, and a new way for developing new energy biomass materials is opened up.

The invention provides a cathode material of a Li-ion secondary battery, the general formula is LiNiaMnbCocO2-XFX, wherein the relationships that a is more than or equal to 0.1 and less than or equal to 0.45, b is more than or equal to 0.1 and less than or equal to 0.45, c is more than or equal to 0.1 and less than or equal to 0.45 and a+b+c=1 are satisfied; the relationship that X is more than or equal to 0.001 and less than or equal to 0.2 is satisfied; Li-Ni-Mn-Co-Fl composite oxide is in an R-3m rhombus lamellar structure; and in XRD, the value of R is 0.25-0.42. The invention also discloses a preparation method of the cathode material, which comprises the following steps: adding the mixed solution of nickel salt, cobalt salt and manganese salt and precipitator solution containing fluorion into an agitated reactor to react and precipitate; after the reaction is completed, washing and drying the precipitation, and preparing the precipitation into a precursor; mixing the precursor and composite containing lithium in the proportion of mass of 1:1 to 1.1; and sintering in the environment atmosphere containing oxygen at a high temperature. The cathode material provided by the invention has good cycle performance and easy control of metal ion precipitation.

The invention relates to a preparation method of a high-dispersion supported nano metal Fe-based catalyst and belongs to the technical field of Fe-based catalysts. According to the preparation method, an Mg-LDHs precursor containing an iron coordination ion intercalation is prepared by virtue of an intercalation assembly method; and then, with methane as an air source, iron nano particles are further reduced and multiwalled carbon nano tubes grow out simultaneously in one step by virtue of a chemical vapor deposition method, and thus the magnalium composite metal oxide supported high-dispersion iron-based catalyst containing the iron nano particles coated with the multiwalled carbon nano tubes. The high-dispersion supported nano metal Fe-based catalyst is structurally characterized in that the iron nano particles are supported on the surface of the magnalium composite metal oxide after being coated with the multiwalled carbon nano tubes. By utilizing the preparation method, the chemical stability of active nano metal particles is improved, the gather of the active nano particles is restrained, and the structure stability of the catalyst is improved due to the strong interaction between the multiwalled carbon nano tubes and the iron nano particles. When used as a fenton-like catalyst, the high-dispersion supported nano metal Fe-based catalyst shows good catalytic oxidation performance to organic dyestuff methylene blue, the degradation rate reaches 95.0-100%, and the high-dispersion supported nano metal Fe-based catalyst has potential practical application value.