폐리튬이온전지 양극재에서의 전이금속 회수 및 응용

초록

Recently, to cope with climate change, the lithium-ion battery market is rapidly increasing, focusing on electric vehicles (EVs) and large-capacity energy storage devices (ESSs). Therefore, to stabilize the demand and price of nickel, cobalt, manganese, lithium, etc., used as main raw materials of NCM cathode materials of lithium-ion batteries, research is being conducted to recover useful resources from waste lithium-ion batteries. Research was conducted to recover and recycle nickel and cobalt from the NCM cathode active material disassembled from the 18650 waste battery. First, the aluminum current collector was treated with a 2.5M sodium hydroxide solution to separate the recovered cathode, and then treated with a 4N sulfuric acid solution to obtain an aqueous sulfuric acid solution in which nickel, cobalt, manganese, and lithium were dissolved in ion form. In each step treated with sodium hydroxide solution and sulfuric acid, impurities and solutions were separately analyzed using X-ray diffraction analysis and an inductively coupled plasma spectrophotometer. Thereafter, using a leachate, nickel and cobalt will be plated on various metal materials and used in various ways as electrochemical materials.