Carbothermic Reduction Roasting of Cathode Active Materials Using Activated Carbon and Graphite to Enhance the Sulfuric-Acid-Leaching Efficiency of Nickel and Cobalt

Carbothermic reduction-roasting tests of NCM (nickel, cobalt, and manganese) cathode active materials with carbon sources such as activated graphite followed by sulfuric acid leaching were performed to investigate the effects roasting temperature, molar mixing ratio sources, type materials. When virgin NCM622 roasted carbon, peaks Ni Co metals observed in XRD data. The efficiencies Li, Ni, Co, Mn increased over 99.9% within 120 min all samples at 600 °C–900 °C, but, beginning leaching, more slowly increasing temperature. decreased decreasing but than ratios. These results indicate that can enhance improve conventional process using hydrogen peroxide.