Recovery of Metals from Spent Lithium-ion Battery by Supercritical Carbon Dioxide with Chelating Ligand

摘要

Technological development decreases the lifetime of electronic equipment,resulting in the waste of lithium-ion batteries(LIBs)and urgent demand of high efficiency recycling processes [1].The supercritical fluids are considering to be an excellent process for recycling metal ions,such as palladium,uranium and so on.The formation of complexes of metal ions with organic matter reduces their polarity,allowing them to be easily dissolved in supercritical CO2 for efficient extraction.Moreover,supercritical CO2 extraction was considered to be an environmentally friendly process because of reducing the amount of organic solvents [2].Here,separation of valuable heavy metal such as Cobalt(Co)from LIBs using supercritical carbon dioxide(SC-CO2)with chelating ligand was investigated.Compared with the conventional method [3],the SCCO2 extraction may enhance the rate of separation due to its low viscosity and high diffusivity.