Extraction of valuable metals from new type of cathodic active material scrap for lithium ion battery using Supercritical CO2

Abstract

In this study, the metal extraction from spent lithium ion battery waste using scCO2 was investigated. The Cyanex 272, D2EHPA, PC88A, Versatic acid, and DEA ligands were used to extract metal ions in scCO2. Prior to extract metals from solid phase directly, the influences of complexing-agent concentration was studied on divalent metals such as Co2+, Li+, Ni2+, and Mn2+ from leaching solution of spent lithium ion battery waste. The method consists of scCO2/ligands complexation process and metal extraction process at 60oC, 200bar. It is highly probable to have a synergistic effect when a base such as amines is added to a cationic exchanger type extractant such as Cyanex 272, D2EHPA, and PC88A. Selective extraction for cobalt from other metal ions was hardly achieved with those ligands. Therefore, further studies will be carried out to achieve cobalt extraction selectively using effective chelate ligands and also to extract cobalt directly from solid phase.