36results about How to "High crystal phase purity" patented technology

The invention relates to synthetic rare earth doped nitric oxide fluorescent powder and a preparation method thereof, which is characterized in that the general chemical formula of the rare earth doped nitric oxide fluorescent powder is A1-xByOzN2 / 3+4 / 3y-2 / 3z : xRe, wherein A is one or the combination of two or more of Ca ion, Sr ion and Ba ion and comes from the oxide, carbonate or nitrate whichcontains A element; B is one or the combination of Si ion and A1 ion, at least contains Si ion and comes from the nitride which contains B element; Re is one or the combination of two or more of Eu ion, Ce ion, Dy ion and Mn ion and comes from the oxide, nitrate or acetate which contains Re element; and the relations of X is more than or equal to 0 and less than 1.0, Y is more than or equal to 1.0 and less than or equal to 2.0 and Z is more than 0 and less than or equal to 2.0 are satisfied. The luminescent material is of stable physical and chemical properties, strong thermal decay resistance and high quantum efficiency, is suitable for excitation of wavelength at 300nm-600nm and is widely applicable in LED lighting and display devices. The fluorescent powder is synthesized through two-step synthesis by taking cheap compounds as the materials and the fluorescent powder synthesized through the method under normal pressure is of pure phase.

The invention provides a sodium iron phosphate pyrophosphate composite material coated with vanadium sodium fluorophosphate and its preparation method and application. By coating the sodium vanadium fluorophosphate on the surface of sodium iron phosphate pyrophosphate, the sodium iron phosphate pyrophosphate material can be effectively solved. Due to the problems of unstable phase transition, slow ion diffusion and poor cycle stability, its application in batteries can make the batteries have higher working voltage, good stability and excellent electrochemical performance.

The invention belongs to the field of electrode materials for sodium ion batteries, and specifically discloses a ferric sodium pyrophosphate phosphorus fluoride@C@RGO composite material. The compositematerial includes reduced graphene oxide and active particles compounded in situ on the surface of the reduced graphene oxide. The active particles are ferric sodium pyrophosphate phosphorus fluoride, and the chemical formula of the ferric sodium pyrophosphate phosphorus fluoride is Na4Fe3PO4P2O7F3. The invention also provides a preparation method and an application of the material. The materialhas the characteristics of high theoretical quantity, high voltage, stable cycling and low cost of raw materials, and has a good prospect of industrialization. It is discovered from the invention that, through the novel active ingredient and the innovative double-carbon in-situ composite morphology, the technical problems of phase transition, poor stability and poor electrical performance of the existing iron-based cathode material can be solved, and the voltage, capacity, rate and cycle stability of the material can be improved.