Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Relationship between Particle Density and Electrochemical Properties of Spherical LiMn2-xMxO4 (M = Al, Mg, B) Spinel Cathode Materials

구형 스피넬계 LiMxMn2-xO4 (M = Al, Mg, B) 양극소재의 입자치밀도와 전지성능간의 상관관계에 대한 연구

  • Kim, Kyoung-Hee (Advanced Batteries Research Center, Korea Electronic Technology Institute) ;
  • Jung, Tae-Gyu (Advanced Batteries Research Center, Korea Electronic Technology Institute) ;
  • Song, Jun-Ho (Advanced Batteries Research Center, Korea Electronic Technology Institute) ;
  • Kim, Young-Jun (Advanced Batteries Research Center, Korea Electronic Technology Institute)
  • 김경희 (전자부품연구원 차세대전지연구센터) ;
  • 정태규 (전자부품연구원 차세대전지연구센터) ;
  • 송준호 (전자부품연구원 차세대전지연구센터) ;
  • 김영준 (전자부품연구원 차세대전지연구센터)
  • Received : 2011.09.19
  • Accepted : 2012.03.12
  • Published : 2012.05.31
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Abstract

Spherical lithium manganese oxide spinel, $LiMn_{2-x}M_xO_4$ (M = Al, Mg, B) prepared by wet-milling, spray-drying, and sintering process has been investigated as a cathode material for lithium ion batteries. As-prepared powders exhibit various surface morphologies and internal density in terms of boron (B) doping level. It is found that the dopant B drives the growth of the primary particle and minimizes the surface area of the powder. As a result, the dopant enhances the internal density of the particles. Electrochemical tests demonstrated that the capacity of the synthesized material at 5 C could be maintained up to 90% of that at 0.2 C. The cycle performance of the material showed that the initial capacity was retained up to 80% even after 500 cycles under the high temperature of $60^{\circ}C$.

본 연구에서는 습식분쇄, 구형화 분무건조 및 열처리 공정을 통해 구형의 $LiMn_{2-x}M_xO_4$(M = Al, Mg, B) 스피넬계 양극소재를 합성하고, 이의 전기화학적 성능을 평가하였다. $MnO_2$ (Tosoh, 91.94%), $Li_2CO_3$ (SQM, 97%), $MgCO_3$ (Aldrich, 99%), $Al(OH)_3$ (Aldrich, 99%) 및 $B_2O_3$ (Aldrich, 99%)를 원료로 사용하였으며, 분무건조공정에서 전구체의 구형화도 증가를 위해 PAAH 바인더를 첨가하였다. 200~500 nm 크기로 분쇄된 혼합 슬러리 용액으로부터 분무건조법을 통해 구형의 전구체를 제조하고, 이를 다양한 조건에서 열처리하여 최종 스피넬계 $LiMn_{2-x}M_xO_4$ (M = Al, Mg, B) 양극소재를 제조하였다. 제조된 구형의 $LiMn_{2-x}M_xO_4$ (M = Al, Mg, B) 양극재료는 이종원소 치환량, 특히 Boron 치환량에 따라 입자 표면 및 내부의 치밀도가 변화하는 것을 확인할 수 있었으며, 치밀도가 증가함에 따라 소재의 출력특성이 향상되었으며, 최적 조성의 양극소재는 상온 5 C 용량이 0.2 C 용량 대비 90% 이상이 됨을 확인하였다. 또한 표면의 치밀도도 증가함에 따라 $60^{\circ}C$ 고온 충방전 조건에서 수명특성이 향상되어 500회 사이클 이후에도 초기용량의 80% 이상을 유지하였다.

Keywords

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