Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Characteristics of LiMn2O4 Cathodes Synthesized from Various Precursors of Manganese Oxide and Manganese Hydroxide

다양한 형태 및 구조의 망간산화물 및 망간수산화물 전구체로부터 합성한 LiMn2O4양극의 전기화학적 특성 연구

  • Lee, Jong-Moon (Division of Energy System Research, Ajou University) ;
  • Kim, Joo-Seong (Division of Energy System Research, Ajou University) ;
  • Hong, Soon-Kie (Division of Energy System Research, Ajou University) ;
  • Lee, Jeong-Jin (Division of Energy System Research, Ajou University) ;
  • Ahn, Han-Cheol (Division of Energy System Research, Ajou University) ;
  • Cho, Won-Il (Energy Storage Research Center, Korea Institute of Science and Technology) ;
  • Mho, Sun-Il (Division of Energy System Research, Ajou University)
  • 이종문 (아주대학교 에너지시스템학부) ;
  • 김주성 (아주대학교 에너지시스템학부) ;
  • 홍순기 (아주대학교 에너지시스템학부) ;
  • 이정진 (아주대학교 에너지시스템학부) ;
  • 안한철 (아주대학교 에너지시스템학부) ;
  • 조원일 (한국과학기술연구원 에너지융합연구단) ;
  • 모선일 (아주대학교 에너지시스템학부)
  • Received : 2012.08.02
  • Accepted : 2012.08.30
  • Published : 2012.08.31
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Abstract

The $LiMn_2O_4$ cathodes for lithium ion battery were synthesized from various precursors of manganese oxides and manganese hydroxides. As the first step, nanosized precursors such as ${\alpha}-MnO_2$ (nano-sticks), ${\beta}-MnO_2$ (nano-rods), $Mn_3O_4$ (nano-octahedra), amorphous $MnO_2$(nano-spheres), and $Mn(OH)_2$ (nano-plates) were prepared by a hydrothermal or a precipitation method. Spinel $LiMn_2O_4$ with various sizes and shapes were finally synthesized by a solid-state reaction method from the manganese precursors and LiOH. Nano-sized (500 nm) octahedron $LiMn_2O_4$ showed high capacities of 107 mAh $g^{-1}$ and 99 mAh $g^{-1}$ at 1 C- and 50 C-rate, respectively. Three dimensional octahedral crystallites exhibit superior electrochemical characteristics to the other one-dimensional and two-dimensional shaped $LiMn_2O_4$ nanoparticles. After 500 consecutive charge discharge battery cycles at 10 C-rate with the nano-octahedron $LiMn_2O_4$ cathode, the capacity retention of 95% was observed, which is far better than any other morphologies studied in this work.

리튬이온전지의 양극소재인 $LiMn_2O_4$를 다양한 모양과 크기의 망간산화물 및 망간수산화물 전구체를 사용해서 합성하였다. 첫 번째 단계로 수열합성법이나 침전법을 사용하여 ${\alpha}-MnO_2$, ${\beta}-MnO_2$, $Mn_3O_4$, amorphous $MnO_2$ 및 $Mn(OH)_2$ 등의 전구체를 합성하였고, 두 번째 단계로 이들 전구체로부터 고상법을 사용하여 다양한 형태의 $LiMn_2O_4$를 제조하였다. 합성된 $LiMn_2O_4$의 특성은 주사전자현미경과 XRD Rietveld구조분석을 통해 확인하고, Li coin cell로 조립하여 전극특성을 측정하였다. 500 nm크기의 팔면체(nano-octahedron) $LiMn_2O_4$가 1 C-rate와 50 C-rate에서 각각 107 mAh $g^{-1}$, 99 mAh $g^{-1}$의 높은 전지용량을 나타내며, 다양한 방전전류에서 가장 우수한 전기화학적 특성을 보인다. 3차원 팔면체 결정입자가 1차원 막대모양이나 2차원 판상모양의 다른 형태의 $LiMn_2O_4$보다 구조적 안정성도 우수한 것으로 평가된다. 또한 10 C-rate의 높은 전류로 500회 충 방전이 진행된 후에도 nano-octahedron $LiMn_2O_4$는 단지 5%의 용량감소(95% capacity retention)로 우수한 전극특성을 나타냈다.

Keywords

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