Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Effect of Carbon on Electrode Characteristics of $LiCoO_2$ Resynthesis

$LiCoO_2$의 재합성시(再合成時) 전극특성(電極特性)에 미치는 탄소(炭素)의 영향(影響)

  • Lee, Churl-Kyoung (School of Material & System Engineering, Kumoh National Institute of Technology) ;
  • Park, Jeong-Kil (School of Material & System Engineering, Kumoh National Institute of Technology) ;
  • Sohn, Jeong-Soo (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
  • 이철경 (금오공과대학교 신소재시스템공학부) ;
  • 박정길 (금오공과대학교 신소재시스템공학부) ;
  • 손정수 (한국지질자원연구원 자원활용소재연구부)
  • Published : 2007.12.27
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Abstract

The mechanical process followed by hydrometallurgical treatment has been developed in order to recover cobalt and lithium from spent lithium ion battery. In the previous study, a citrate precursor combustion process to prepare cathodic active materials from the leaching solution was elucidated. Resynthesis of electrode materials should be more valuable in spent battery recycling. Conventional slurry mixing of $LiCoO_2$ and carbon cannot make uniform distribution, and therefore the cathode cannot reach the theoretical charge-discharge capacity and is easily degraded during the charge-discharge cycling. In this study, ultra-fine $LiCoO_2$ powders has been prepared by modification of the combustion process and fabricated the enhanced cathode by modification of mixing method of $LiCoO_2$ and carbon added.

폐리튬이온전지의 리싸이클링을 위하여 폐전지의 기계적 처리에 의한 Co의 농축과 습식처리에 의한 Co의 회수기술이 개발되었다. 전 연구에서는 폐전지 리싸이클링의 부가가치를 향상시키기 위하여 Co 농축 침출액으로부터 양극활물질을 재합성하는 공정으로 citrate precursor combustion법을 제안하고 가능성을 확인하였다. 기존의 전극제조 공정에서는 활물질인 $LiCoO_2$와 첨가제인 탄소의 비중 및 크기 차이로 균일한 혼합이 이루어지지 않으므로 충방전 용량이 이론용량에 비하여 매우 낮고 또한 싸이클이 반복될수록 용량이 크게 감소하는 경향을 보였다. 본 연구에서는 합성된 $LiCoO_2$ 전극특성을 향상시키는 일환으로 합성공정의 개선을 통하여 초미립 $LiCoO_2$을 합성하였으며, 탄소 첨가시 혼합법의 개선에 의하여 우수한 충방전 특성을 갖는 리튬전지용 양극을 개발하였다.

Keywords

References

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