Cobalt hydroxide material and lithium cobalt oxide material as well as preparation method and application thereof

The invention belongs to the field of lithium ion batteries, and relates to a cobalt hydroxide material and a lithium cobalt oxide material as well as a preparation method and application thereof. The preparation method of the cobalt hydroxide material comprises the following steps: respectively and continuously introducing a cobalt source solution, a chelating agent solution and an alkali solution into a reaction kettle for chelation reaction, controlling the feeding amount of the cobalt source solution to be 8-20L/h, the feeding amount of the chelating agent solution to be 0.1-5L/h, and the feeding amount of the alkali solution to control the pH value of the system to be 10.8-11.5, the chelating agent solution contains ammonium dihydrogen phosphate and ammonia water at the same time, after the particle size distribution is stable, collecting overflow tank slurry, and sequentially filtering, washing and drying the slurry to obtain the cobalt hydroxide material. The lithium cobalt oxide material obtained by t