2results about How to "Doping achieved" patented technology

This invention discloses an in-situ surface-coated LiF-coated water-resistant 4.7V lithium cobalt oxide cathode material, its preparation method, and its applications. The chemical formula of the cathode material of this invention is Li. 1‑2x‑2y Co 1‑ z Mg x Ni y Al z O2@LiF, where 0≤x≤0.05, 0≤y≤0.05, 0≤z≤0.05, and x, y, and z cannot all be 0; LiF is Li 1‑2x‑2y Co 1‑z Mg x Ni y Al z O2 material coating layer. This invention mixes lithium metal salts, cobalt compounds, and an F-containing dopant to obtain a mixture; the mixture is sintered once at a high temperature, then cooled and ground uniformly, followed by a second sintering and cooling to obtain the in-situ surface-coated water-resistant 4.7V lithium cobalt oxide material. This invention constructs a complete, continuous, and uniformly distributed hydrophobic protective layer on the surface of lithium cobalt oxide particles through in-situ coating technology, effectively blocking the corrosion of the material by electrolyte and moisture; the simultaneously formed elemental doping enhances the metal-oxygen bond binding energy, synergistically improving the bulk structural stability and jointly ensuring the long cycle life of the electrode material.

The invention relates to a preparation method of a Zr-doped RuO2 acidic water electrolysis anode catalyst, which can be realized only by means of room-temperature stirring and subsequent low-temperature annealing: firstly, sufficiently dissolving a metal precursor under a stirring condition, then evaporating a solvent in a vacuum drying oven, and centrifugally washing solid powder for several times; finally, the dried solid powder is placed in a muffle furnace to be annealed, a crucible is taken out to be naturally cooled, and the Zr-doped RuO2 acidic water electrolysis anode catalyst can be obtained. Compared with an existing preparation method, the preparation method provided by the invention is simple and easy to implement, mild in reaction condition, easy to control, high in repeatability and suitable for large-scale production, and solves the technical problems of high cost, complicated process flow, difficulty in batch synthesis and the like of an electrolytic water catalyst in the prior art; the prepared catalyst shows remarkably enhanced catalytic activity and stability in acidic water electrolysis as an anode material, is superior to self-made RuO2 and commercial RuO2, shows good application potential in large-scale water electrolysis, and has a relatively high industrial research prospect.