Study on Selective Lithium Leaching Effect on Roasting Conditions of the Waste Electric Vehicle Cell Powder

Abstract

Recently, the use of lithium ion battery(LIB) has increased. As a result, the price of lithium and the amount spent lithium on ion battery has increased. For this reason, research on recycling lithium in waste LIBs has been conducted. In this study, the effect of roasting for the selective lithium leaching from the spent LIBs is studied. Chemical transformation is required for selective lithium leaching in NCM LiNixCoyMnzO2) of the spent LIBs. The carbon in the waste EV cell powder reacts with the oxygen of the oxide at high temperature. After roasting at 550 ~ 850 C in the Air/N2 atmosphere, the chemical transformation is analysed by XRD. The heat treated powders are leached at a ratio of 1:10 in D.I water for ICP analysis. As a result of XRD analysis, Li2CO3 peak is observed at 700 C. After the heat treatment at 850 °C, a peak of Li2O was confirmed because Li2CO3 · Received : November 1, 2019 · Revised : November 19, 2019 · Accepted : November 25, 2019 § Corresponding Author : Seong Ho Son (E-mail : shson@kitech.re.kr) Surface R & D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea cThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited. 80 정연재 ·손성호 ·박성철 ·김용환 ·유봉영 ·이만승 J. of Korean Inst. Resources Recycling Vol. 28, No. 6, 2019 is decomposed into Li2O and CO2 over 723 °C. The produced Li2O reacted with Al at high temperature to form LiAlO2, which does not leach in D.I water, leading to a decrease in lithium leaching ratio. As a result of lithium leaching in water after heat treatment, lithium leaching ratio was the highest after heat treatment at 700 C. After the solid-liquid separation, over 45 % of lithium leaching was confirmed by ICP analysis. After evaporation of the leached solution, peak of Li2CO3 was detected by XRD.