전기화학회지 (Journal of the Korean Electrochemical Society)

  • 제16권2호
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  • Pages.59-64
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  • 2013
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  • 1229-1935(pISSN)
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  • 2288-9000(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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리튬 이차전지용 양극활물질 Li[Ni0.6Co0.2Mn0.2]O2의 소성 온도가 전기화학적 특성에 미치는 영향

Effects of Calcinations Temperature on the Electrochemical Properties of Li[Ni0.6Co0.2Mn0.2]O2 Lithium-ion Cathode Materials

  • 유기원 (한국교통대학교 나노고분자공학과) ;
  • 전효진 (한국교통대학교 나노고분자공학과) ;
  • 손종태 (한국교통대학교 나노고분자공학과)
  • Yoo, Gi-Won (Department of Nano Polymer Science & Engineering, Korea National University of Transportation) ;
  • Jeon, Hyo-Jin (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)
  • 투고 : 2013.02.13
  • 심사 : 2013.02.25
  • 발행 : 2013.05.31
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초록

$Na_2CO_3$와 [M($SO_4$)(M = Ni, Co, Mn)]을 사용함으로써, Carbonate 공침 합성법에 의해 $[Ni_{0.6}Co_{0.2}Mn_{0.2}]CO_3$ 전구체를 합성하였다. 합성된 전구체는 공기분위기에서 $Li_2CO_3$와 혼합하여 각각, 750, 850 그리고 $950^{\circ}C$에서 소성되었고, 이로 인한 $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ 양극활 물질의 소성온도가 미치는 영향을 조사하였다. $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$의 구조와 특성은 X-선 회절 분석(XRD), 시차주사현미경(SEM) 그리고 전기화학적 측정으로 분석되었는데, X-선 회절 결과 $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$는 소성온도가 증가함에 따라서 $I_{(003)}/I_{(104)}$는 증가하고 R-factor 는 감소하였으며, 시차주사현미경 결과에서는 1차 입자의 크기가 증가하는 경향을 보였다. 특히, $950^{\circ}C$에서 24시간 동안 소성된 $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$는 가역 용량이 $165.3mAhg^{-1}$[cut-off voltage 2.5~4.3 V, 0.1 C($17mAhg^{-1}$)] 그리고 50번째 충 방전 사이클 [cut-off voltage 2.5~4.3 V, 1 C($170mAhg^{-1}$)]까지 95.4%의 우수한 용량 보존율을 가지면서 가장 우수한 전기화학적 특성을 보여주었다.

Using $Na_2CO_3$ and $MeSO_4$ (Me = Ni, Co and Mn) as starting materials, the precursor of $[Ni_{0.6}Co_{0.2}Mn_{0.2}]CO_3$ has been synthesized by carbonate co-precipitation. The precursor was mixed with $Li_2CO_3$, and calcined at 750, 850, and$950^{\circ}C$ in air. Effect of calcinations temperature on characteristics of $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ cathode materials was investigated. The structure and characteristics of $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ were determined by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and electrochemical measurements. The X-ray diffraction (XRD) results show that the intensity ratio of $I_{(003)}/I_{(104)}$ increased and the R-factor ratio decreased with the increase of calcinations temperature. And Scanning electron microscopy (SEM) result show that the primary particle size increased. Especially, the $Li[Ni_{0.6}Co_{0.2}Mn_{0.2}]O_2$ calcined at $950^{\circ}C$ for 24 H shows excellent electrochemical performances with reversible specific capacity of $165.3mAhg^{-1}$ [cut-off voltage 2.5~4.3 V, 0.1 C($17mAhg^{-1}$)] and good capacity retention of 95.4% after 50th charge/discharge cycles[cut-off voltage 2.5~4.3 V, 1 C($170mAhg^{-1}$)].

키워드

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피인용 문헌

  1. Effect of Calcination Temperatures on the Structure and Electrochemical Characterization of Li(Ni0.5Mn0.3Co0.2)O2as Cathode Material by Supercritical Hydrothermal Synthesis Method vol.16, pp.3, 2013, https://doi.org/10.5229/JKES.2013.16.3.151
  2. The Structural Stability and Electrochemical Properties of Fe Doped Li[Ni0.575Co0.1Mn0.325]O2 vol.17, pp.3, 2014, https://doi.org/10.5229/JKES.2014.17.3.149
  3. Optimization of the synthesis of Low-cobalt Li[Ni0.6Co0.1Mn0.3]O2 for use as cathode materials for lithium-ion batteries vol.66, pp.1, 2015, https://doi.org/10.3938/jkps.66.70