Preparation method for nanosized lithium colbolt oxide cathode material and application thereof

The present invention belongs to the technical field of lithium ion battery positive electrode materials, and disclosed are a preparation method for a nano lithium cobalt oxide positive electrode material and the use thereof. The preparation method comprises the following steps: mixing a carbonate solution and a dispersant until uniform, adding a cobalt salt solution for reaction, then aging and filtering same, removing filter residues and drying same to obtain nano CoCO3 powder, then calcining same to obtain a Co3O4 precursor, mixing the Co3O4 precursor with a lithium salt, then sintering, cooling, crushing and sieving same to obtain the nano lithium cobalt oxide positive electrode material. The present invention has the main advantages of the synthesis process of nano CoCO3 being simple and easy to control, the process being short, particularly fine temperature control not being needed, and conditions such as the pH value also not needing to be accurately controlled during the reaction process. The present invention is suitable for large-scale industrial production.