Method for preparing low-anion residual basic cobalt carbonate

The invention provides a method for preparing low-anion residual basic cobalt carbonate. The method comprises the following process steps of: (1) preparing ammonium hydrogen carbonate solution having a concentration being 2.0-3.5mol/L and a cobalt salt solution having a concentration being 1.0-2.0mol/L, respectively; (2) taking the ammonium hydrogen carbonate solution as a reaction base solution, and under the condition of stirring, spraying the cobalt salt solution and the ammonium hydrogen carbonate solution to the reaction base solution in a volume ratio of 1: (0-1.5), keeping the reaction temperature in the range from 55 DEG C to 65 DEG C under control, and keeping the pH value of the solution at 7.0 to 7.5 at the endpoint of reaction; and (3) filtering the solution after reaction, and washing the solid material obtained through filtering by using deionized water 3-5 times, thus obtaining the target product. The product basic cobalt carbonate of the method provided by the invention is low in anion content