| 摘要 |
Disclosed is an aqueous coating method for a high-voltage lithium cobalt oxide positive electrode material. Specifically steps comprise: weighing and taking pure water and adding the pure water to a ball mill to perform ball milling, after ball milling is complete, starting a cycle, and then separately weighing and taking a dispersant and a metal ion compound and adding the dispersant and the metal ion compound to the ball mill to perform cyclic ball milling and dispersion, to complete preparation of a primary slurry; then weighing and taking lithium cobalt oxide and adding the lithium cobalt oxide to the ball mill to perform ball milling and dispersion, to complete preparation of a secondary slurry; after dispersion, the slurry is added to a vacuum drying machine by using a mortar pump to perform drying; and after drying, adding the material to a kiln to perform secondary sintering; and performing screening and metal elimination on the material after secondary sintering, to obtain a required material. For the preparation method disclosed in the present invention, a layer of oxide is coated on a surface of lithium cobalt oxide, thereby improving charging and discharging voltages of a lithium cobalt oxide positive electrode material, and overcoming a defect of undesirable cycling stability of the material during high-voltage charging and discharging, so that the material of the present invention can be used as a 4.4-V positive electrode lithium cobalt oxide material of a lithium ion battery. |
