Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Structural Stability and Electrochemical Properties of Fe Doped Li[Ni0.575Co0.1Mn0.325]O2

Fe을 도핑한 Li[Ni0.575Co0.1Mn0.325]O2의 구조적인 안정성 및 전기화학적 특성

  • Yang, Su-Bin (Department of Nano Polymer Science & Engineering, Korea National University of Transportation) ;
  • Yoo, Gi-Won (Department of Nano Polymer Science & Engineering, Korea National University of Transportation) ;
  • Jang, Byeong-Chan (Department of Nano Polymer Science & Engineering, Korea National University of Transportation) ;
  • Son, Jong-Tae (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
  • 양수빈 (한국교통대학교 나노화학소재공학과) ;
  • 유기원 (한국교통대학교 나노화학소재공학과) ;
  • 장병찬 (한국교통대학교 나노화학소재공학과) ;
  • 손종태 (한국교통대학교 나노화학소재공학과)
  • Received : 2014.02.17
  • Accepted : 2014.05.30
  • Published : 2014.08.31
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Abstract

In this study, a positive-electrode material in a lithium secondary battery $Li[Ni_{0.575}Co_{0.1}Mn_{0.325}]O_2$ was synthesized as precursor by co-precipitation. Cathode material was synthesized by adding iron. The synthesized cathode material was analyzed by scanning electron microscope and x-ray diffraction. The analysis of x-ray diffraction showed that the a-axis and c-axis is increased by doping iron. And $I_{(003)}/I_{(104)}$ is increased and $I_{(006)}+I_{(102)}/I_{(101)}$ is decreased. Through this result, it was confirmed that the structural stability is improved. And impedance measurements show that the charge transfer resistance ($R_{ct}$) is lowered by doping iron. Consequently, electrochemical properties are improved by doping iron. In particular, the cycle characteristics are improved at a high temperature condition (328 K). Structural stabilities are contributing to the cycle properties.

본 연구에서는 리튬 이차전지의 양극 재료인 $Li[Ni_{0.575}Co_{0.1}Mn_{0.325}]O_2$를 공침법(Co-precipitation)으로 전구체를 합성 하였고, 철(Fe)을 도핑 함으로써 양극 활물질을 합성하였다. 합성된 양극 활물질을 시차주사현미경 (SEM, Scanning electron microscope)과 X선-회절분석(XRD, X-ray diffraction)으로 분석하였다. X선-회절분석 결과 철(Fe)을 도핑 함으로써 a축과 c축이 증가하였고, $I_{(003)}/I_{(104)}$의 비가 증가하는 것과 $I_{(006)}+I_{(102)}/I_{(101)}$비가 작아지는 것을 통해 구조적 안정성이 증가하는 것을 확인했다. 전기화학적 특성 측정 결과 사이클 특성이 향상되었고, 임피던스 측정 결과 전하 이동 저항($R_{ct}$) 값이 낮아짐을 통해 전기화학적 분석 결과에서도 철(Fe)을 도핑 하였을 때 개선 된 특성을 나타내었다. 특히, 고온 조건에서 사이클 특성이 개선되는 것을 확인 하였는데, 이는 구조적 안정성이 사이클 특성에 기여하였기 때문이다.

Keywords

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