32results about How to "Complete crystal structure" patented technology

The invention discloses a cobalt-free lithium-rich manganese-based cathode material as well as a preparation method and application thereof. The cathode material has a chemical formula Li[1+x]Ni[y]Mn[0.8-y]O2 (x is more than 0 and less than 1 / 3 and y is more than 0 and less than 0.8). The preparation method comprises the following steps: preparing a precursor in an ethanol or de-ionized water solvent by adopting a sol-gel method, pre-sintering at the low temperature, performing ball-milling, and performing high-temperature solid-phase sintering to obtain the cathode material. The cathode material prepared by adopting the method is applied to lithium ion batteries, is high in specific discharge capacity (278mAh / g) and energy density, is expected to replace commercialized mainstream products-LiCoO2 cathode materials and lithium iron phosphate power batteries, and becomes a novel material of high-specific-capacity cathode materials for electric vehicles at present.

A process for preparing Co3O4 includes such steps as dissolving Co in nitric acid, hydrochloric acid or sulfuric acid to generate cobolt nitrate (or sulfate, or chloride), dissolving precipitant and complexing agent in deionized water to prepare saturated solution, adding the prepared to solution to reactor, regulating pH=4-5.5, adding complexing precipitant at 35-100 deg.c while stirring, reacting, filtering, washing with deionized water at temp higher than 90 deg.C, calcining at 300-1000 deg.C for 5-25 hr, pulverizing and classifying.

The invention belongs to the field of inorganic compound semiconductor materials, and more particularly relates to a preparation method for improving the quality of gallium nitride crystals. The preparation method comprises the following steps: firstly, dispersing metal gallium salt and a nucleation inducer in a polyvinyl alcohol water solution, adding a water-based adhesive and stirring at a high speed, such that the gallium salt and the nucleation inducer are coated in a gel network structure formed from polyvinyl alcohol; then carrying out high-pressure homogenization to form nano composite gel; uniformly coating the obtained composite gel onto an Si substrate subjected to surface treatment; putting the Si substrate in a tube furnace and drying in a nitrogen atmosphere, and then raising the temperature of the tube furnace to 850 to 1050 DEG C; introducing ammonia to react for 90 to 110min; stopping introducing the ammonia and cooling to room temperature in the nitrogen atmosphere to obtain faint yellow gallium nitride crystals having a regular crystal form. According to the preparation method, the gallium nitride crystals are prepared by coating the composite nano gel formed by the gallium salt and the nucleation inducer onto the Si substrate, such that the gallium nitride crystals are good in surface appearance, regular in crystal form, high in yield and high in purity and have a wide application value.

The invention aims at providing a solid solution type FexCo1-xS2 positive electrode material for thermal batteries, and a preparation method of the solid solution type FexCo1-xS2 positive electrode material. The component contents of a Fe-Co alloy skeleton is precisely controlled by a Raney method, and a FexCo1-xS2 solid solution is synthesized by means of a high temperature solid phase vulcanization method. The preparation method provided by the invention can realize the precise regulation and control of the atomic ratio in a target product simply by changing a feeding proportion, and provides the performance-oriented positive electrode material in a customized way aiming at the electrical performance requirements of the thermal batteries. The solid solution type FexCo1-xS2 positive electrode material obtained by using the preparation method provided by the invention has the characteristics of being controllable in active component content, high in electrode potential, stable in voltage platform, small in polarization internal resistance and high in thermal stability; thermal decomposition temperature of the positive electrode material is not lower than 570 DEG C, and the actual discharge specific capacity is not lower than 1300 As / g.

The invention discloses a preparation method of cerium and praseodymium stabilized zirconia polishing powder. The preparation method comprises the following steps: mixing zirconium carbonate, cerium carbonate, praseodymium carbonate and a hydrochloric acid solution to obtain a mixed solution; adding an alkaline solution into the mixed solution in a stirring state, and carrying out a precipitation reaction to obtain alkaline zirconium carbonate cerium and praseodymium coprecipitation; and carrying out first roasting, smashing and second roasting in sequence on the alkaline zirconium carbonate cerium and praseodymium coprecipitation so as to obtain the cerium and praseodymium stabilized zirconia polishing powder. The two elements of cerium and praseodymium are doped into the zirconia polishing powder, and the polishing powder obtained through first roasting, smashing and second roasting has relatively high removing rate and relatively low micro scratch level, so that the polishing performance of the polishing powder is improved, and the requirements for high-precision and large-diameter optical glass lenses in the market are met.

The invention discloses a method for removing arsenic from an acidic arsenic-containing solution by using an iron salt. The method comprises the following steps: (1) adjusting the pH value of the acidic arsenic-containing solution, stirring and heating the adjusted solution, and adding a ferrous salt to obtain a mixed solution; and (2) adding magnetite to the mixed solution, adding an oxidant, stirring, heating and reacting the obtained solution, and filtering the solution to remove scorodite filter residues in order to complete the removal of arsenic in the acidic arsenic-containing solution.A precipitate obtained after arsenic precipitation of new highly-active crystal seeds is iron arsenate with a good crystal form, and has the advantages of high arsenic content, small size, complete crystal form structure, low toxicity leaching concentration of arsenic, good long-term stability, and easiness in clarification, filtration and separation. The method has the advantages of mild processconditions, simple process, convenience in operation, small dosages of reagents, small amount of arsenic iron residues, low price and low cost of the raw material, and realization of the production of the iron arsenate precipitate-scorodite with the good crystal form from the acidic arsenic-containing solution of copper smelting flue dust.

The invention discloses a layered structure copper-based catalyst and its preparation method and application. The layered structure copper-based catalyst comprises the following components in weight percentage: Cu: 26-65%; ZnO: 22-52%; Al2O3 :6‑22%. The copper-based catalyst with a layered structure of the present invention has a large specific surface area, a small loss of copper and a high degree of dispersion, which is beneficial to the adsorption and activation of reactants, and overcomes the low conversion rate of catalytic carbon dioxide and methanol selectivity of existing carbon dioxide hydrogenation methanol synthesis catalysts. Poor disadvantages.

The invention provides a method for preparing a composite flame retardant of organic acid pillared hydrotalcite by using phosphorus tailings. The method comprises the following steps: washing the high-magnesium phosphorus tailings obtained by phosphate rock flotation, calcining to remove organic matter, and mixing with Inorganic acids are mixed to obtain Ca-containing 2+ , Mg 2+ solution; to the Ca 2+ , Mg 2+ A certain amount of ammonia water is added to the solution to remove impurities, after filtration, a certain amount of aluminum salt solution is added, stirred and mixed, an alkaline solution is added dropwise, reacted, and crystallized to obtain calcium magnesium aluminum hydrotalcite; Add a certain concentration of organic acid sodium salt solution to talc, stir vigorously, react, crystallize, filter, wash until neutral, dry, and grind into powder to obtain organic-inorganic acid pillared hydrotalcite with excellent flame retardancy Flame retardant products. The organic-inorganic chelated flame retardant material obtained by the invention has excellent flame retardancy, and effectively recycles and utilizes valuable elements in the high-magnesium phosphorus tailings, which opens up a new way for the comprehensive utilization of the phosphorus tailings.