1results 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.