자원리싸이클링 (Resources Recycling)

  • 제24권6호
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  • Pages.9-16
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  • 2015
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  • 2765-3439(pISSN)
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  • 2765-3447(eISSN)
한국자원리싸이클링학회 (The Korean Institute of Resources Recycling)
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리튬이차전지 양극활물질의 암모니아 침출액에서 공침법에 의한 활물질 전구체의 합성에 대한 암모니아 농도의 영향

The Effect of NH3 Concentration during Co-precipitation of Precursors from Leachate of Lithium-ion Battery Positive Electrode Active Materials

  • 박상혁 (세종대학교 에너지자원공학과) ;
  • 구희숙 (세종대학교 에너지자원공학과) ;
  • 이경준 (전자부품연구원 차세대전지센터) ;
  • 송준호 (전자부품연구원 차세대전지센터) ;
  • 김수경 (한국지질자원연구원) ;
  • 손정수 (한국지질자원연구원) ;
  • 권경중 (세종대학교 에너지자원공학과)
  • Park, Sanghyuk (Department of Energy and Mineral Resources Engineering, Sejong University) ;
  • Ku, Heesuk (Department of Energy and Mineral Resources Engineering, Sejong University) ;
  • Lee, Kyoung-Joon (Korea Electronics Technology Institute, Advanced Batteries Research Center) ;
  • Song, Jun Ho (Korea Electronics Technology Institute, Advanced Batteries Research Center) ;
  • Kim, Sookyung (Urban Mine Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Sohn, Jeongsoo (Urban Mine Department, Korea Institute of Geoscience and Mineral Resources) ;
  • Kwon, Kyungjung (Department of Energy and Mineral Resources Engineering, Sejong University)
  • 투고 : 2015.06.05
  • 심사 : 2015.10.19
  • 발행 : 2015.12.30
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초록

폐리튬이차전지 양극재 재활용기술에 있어 침출과정을 통해 회수된 유가금속을 다시 원하는 조성의 전구체로 재합성하는 공침공정은 필수적이다. 본 연구에서는 고용량 특성의 Ni-rich 조성인 $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ (NCM 622) 양극재의 전구체 재합성 시 암모니아가 불순물로서 미치는 영향을 확인하는 공침실험을 수행하였다. SEM 및 EDS 분석결과 양극재 전구체 최적 합성조건(금속염 용액 농도 2 M 기준 암모니아수 농도 1 M)에서 암모니아 농도가 증가할수록 원하는 조성의 전구체가 제조되지 않음을 확인하였다. Ni의 설계함량인 60 mol%를 기준하여 암모니아수 농도 1 M ~ 4 M 조건에서 각각 100%, 98%, 95%, 87%에 해당하는 공침효율을 보여주었다. 또한 제조된 전구체 입자들의 구형화도, 균일도 및 크기분포특성 등의 형상학적 특징을 확인하였다.

In a recycling scheme of spent lithium ion batteries, a co-precipitation process for the re-synthesis of precursor is essential after the leaching of lithium ion battery scraps. In this study, the effect of ammonia as impurity during the co-precipitation process was investigated in order to re-synthesize a precursor of Ni-rich cathode active material $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ (NCM 622). As ammonia concentration increases from 1 M (the optimum condition for synthesis of the precursors based on 2 M of metal salt solution) to 4 M, the composition of obtained precursors deviates from the designed composition, most notably for Ni. The Ni co-precipitation efficiency gradually decreases from 100% to 87% when the concentration of ammonia solution increases from 1 M to 4 M. Meanwhile, the morphological properties of the obtained precursors such as sphericity, homogeneity and size distribution of particles were also investigated.

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