High-Performance Regenerated LiNi0.6Co0.2Mn0.2O2 Cathode Material Realized by Argon-Oxygen Mixed Gas Calcination

With the increasing energy problems and environmental pollution, lithium-ion batteries have gradually become the preferred power source for new energy vehicles due to their high energy density. With the global popularity of lithium-ion batteries, the heavy metal pollution and resource waste caused by spent batteries are becoming more and more obvious, and as a result, research on recycling treatment and resource utilization technology is critical. In this study, the leaching treatment of waste ternary cathode materials was carried out by using a H 2 SO 4 -H 2 O 2 leaching system, and the recycled metal elements were used as raw materials for subsequent synthesis. The NCM622 precursor (Ni 0.6 Co 0.2 Mn 0.2 (OH) 2 ) and Li 2 CO 3 were prepared by the co-precipitation method, and the high-performance NCM622-type (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) cathode materials were regenerated by argon-oxygen mixed gas calcination at 850°C after pre-oxidation treatment. The materials exhibited excellent electrochemical performance, with capacity retention as high as 91% after 100 cycles at 0.2C current density, thus demonstrating the ability of this process to achieve high-performance regeneration of NCM622-type cathode materials.