Synthesis of high-density nickel cobalt aluminum hydroxide by continuous coprecipitation method

Spherical nickel cobalt aluminum hydroxide (Ni _0.80Co _0.15Al _0.05-hydroxide, NCA) was prepared by a continuous coprecipitation method. A new design of the Al solution and the feeding method was applied, which enabled to prevent rapid precipitation of Al(OH) ₃ and to obtain spherical NCA with large enough particle size and high density. The active material (LiNi _0.80Co _0.15Al _0.05O ₂ or LNCA) prepared from it showed higher tap-density than that made from NCA prepared by general processes, and homogeneity of Al-distribution was also improved. It is expected that the electrode density of lithium ion batteries adopting LNCA could be improved with the new process proposed in this study.