Li(NCM)O2係 二次電池 工程스크랩의 炭素還元處理에 의한 리튬回收 및 NCM 粉末의 浸出擧動
Recovery of Lithium and Leaching Behavior of NCM Powder by Carbon Reductive Treatment from Li(NCM)O2 System Secondary Battery Scraps
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초록
Li(NCM)O2계 폐리튬전지 공정 스크랩의 재활용 연구의 일환으로서 리튬화합물의 회수와 NCM전구체를 제조하기 위한 침출거동에 대하여 살펴보았다. 우선 탄소를 이용하여 층상 구조의 NCM계 산화물 분말을 분해시켰으며, 600oC 이상의 탄소반응으로 리튬은 탄산리튬으로 변화시켰다. 탄산리튬은 수세 후 농축과정을 거쳐 순도 99% 이상의 탄산리튬 분말로 회수하였다. 그리고 탄소에 의한 환원 반응율은 800oC에서 약 88%을 나타내었으며, 탄소환원 처리 후 분말에 대한 황산 침출 결과, 2M 이상의 황산농도에서 코발트, 니켈, 망간의 침출율은 99% 이상이었다.
Abstract
A study on the recovery of lithium and leaching behavior of NCM powder by carbon reduction for NCM-system Li-ion battery scraps was conducted. First of all, the oxide powders of NCM-system with layer structure were decomposed by carbon, lithium was converted to lithium carbonate by carbon reaction at above 600oC. The lithium carbonate powders with 99% purity were manufactured by washing method with water and concentration process for NCM powder after carbon reduction. The reaction yield was approximately 88% at 800oC by carbon reduction. At this time, leaching efficiency at 2M sulfuric acid concentration was over 99% for cobalt, nickel and manganese.
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