Method of obtaining LiCoO2 cathode material

摘要

The object of the invention is how to obtain LiCoO2 cathode material for use in lithium ion batteries. The way LiCoO2 cathode material is obtained is by precipitating cobalt carbonate in the presence of polyvinylpyrrolidone from inorganic cobalt salt using an aqueous solution of potassium carbonate or sodium in the molar amount 1:1 -2:1 relative to cobalt salt. The precipitation is carried out at the 60-90-C temperature until pH 8-10 is reached at the rate of mixing 400-800 and/or min. At the end of the dosing, the sediment is aged for one to three hours at the 60-90-C temperature.mixing at the same time as the speed 400 -800 obr./min. The resulting sediment is then filtered and rejected with water,Then it dries and calcins to cobalt oxide at temperatures 400-600-C. In the next step, the obtained oxygen material is impregnated with an aqueous solution of lithium hydroxide, so that the molar ratio: lithium/cobalt is within range 1,00 -1,05. The final stage is the calcination of the obtained cathode material precursor at temperatures 700-900-c.