Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Study on Structural Change and Improvement of Electrochemical Properties by Co-precipitation Condition of Li[Ni0.8Co0.15Al0.05]O2 Electrode

Li[Ni0.8Co0.15Al0.05]O2 전극의 공침 조건을 통한 구조적 변화와 전기적 특성의 향상 고찰

  • Im, Jung-Bin (Department of Nano Polymer Science & Engineering, Chungju National University) ;
  • Son, Jong-Tae (Department of Nano Polymer Science & Engineering, Chungju National University)
  • 임정빈 (충주대학교 나노고분자 공학과) ;
  • 손종태 (충주대학교 나노고분자 공학과)
  • Received : 2011.03.30
  • Accepted : 2011.05.23
  • Published : 2011.05.31
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Abstract

[ $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$ ]cathode material for lithium secondary battery is obtained using co-precipitation method. To determine the optimal metal solution concentration value, the CSTR coprecipitation was carried out at various concentration values(1-2 mol/L). The surface morphology of coated samples was characterization by SEM(scanning electron microscope) and XRD (X-Ray Diffraction)analyses. Impedance analysis and cyclic voltammogram presented that internal resistance of the cell was dependent upon the concentration of metal solution. such data is very helpful in determining the optimal content of metal solution concentration to enhancing electrochemical property by adjusting powder size distribution and crystal structure.

본 연구에서는 리튬 이차 전지의 양극 재료인 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$을 공침법(co-precipitation)을 활용하여 성공적으로 합성하였다. 이때 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$의 금속염 농도를 실험 변수로 하여 합성 조건을 변화 시키면서 금속염 농도 변화로 인한 전지 특성의 영향을 분석하였다. SEM(scanning electron microscope)과 XRD (X-Ray Diffraction) 분석결과 금속염의 농도(2몰/L)가 높을 경우 분말의 균일성과 구조의 결정성이 떨어져 전지 특성이 저하되는 현상이 발생하였다. 균일성과 결정성을 향상시키기 위하여 금속염의 농도(1몰/L)를 줄여 합성 한 결과 입도의 미분이 적고 균일성이 및 구조적 결정성이 증가됨을 확인하였다. 또한 충/방전 용량, C-rate, 사이클 등 전기화학적 특성에서도 상대적으로 우수한 특성을 보였다. 이러한 측정 결과를 바탕으로 $Li[Ni_{0.8}Co_{0.15}Al_{0.05}]O_2$ 물질의 금속염 농도에 따른 영향을 종합적으로 고찰하였다.

Keywords

References

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