Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Phase Change of Nanorod-Clustered $MnO_2$ by Hydrothermal Reaction Conditions and the Lithium-ion Battery Cathode Properties of $LiMn_2O_4$ Prepared from the $MnO_2$

수열합성 조건에 따른 나노로드 클러스터형 $MnO_2$의 상변화와 이를 이용한 $LiMn_2O_4$의 리튬이온전지 양전극 특성

  • Kang, Kun-Young (Research Team of Power Control Devices, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Choi, Min Gyu (Research Team of Power Control Devices, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Lee, Young-Gi (Research Team of Power Control Devices, Electronics and Telecommunications Research Institute(ETRI)) ;
  • Kim, Kwang Man (Research Team of Power Control Devices, Electronics and Telecommunications Research Institute(ETRI))
  • 강근영 (한국전자통신연구원 융합부품소재부문 전력제어소자팀) ;
  • 최민규 (한국전자통신연구원 융합부품소재부문 전력제어소자팀) ;
  • 이영기 (한국전자통신연구원 융합부품소재부문 전력제어소자팀) ;
  • 김광만 (한국전자통신연구원 융합부품소재부문 전력제어소자팀)
  • Published : 2011.10.01
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Abstract

Nanorod-clustered $MnO_2$ precursors with ${\alpha}$-, ${\beta}$-, and ${\gamma}$-phases are synthesized by hydrothermal reaction of $MnSO_45H_2O$ and $(NH_4)S_2O_8$. The formation of nanorod-clustered ${\beta}-MnO_2$ is particularly confirmed under the conditions of high reactant concentration and hydrothermal reaction at $150^{\circ}C$. The spinel $LiMn_2O_4$ nanorod-clusters are also prepared by lithiating the $MnO_2$ precursors, varying the concentration of lithiating agent ($LiC_3H_3O_2{\cdot}2H_2O$) and heat treatment temperature, and characterized for use as cathode material of lithium-ion batteries. As a result, the nanorod-clustered $LiMn_2O_4$ prepared from the ${\beta}-MnO_2$ at higher $LiC_3H_3O_2{\cdot}2H_2O$ concentration and the annealing at $800^{\circ}C$ is proven to show the cubic spinel structure and to achieve the high initial discharge capacity of 120 mAh/g.

$MnSO_45H_2O$와 $(NH_4)S_2O_8$의 수열반응으로 1차원 나노로드들이 침상으로 클러스터화된 구조의 $MnO_2$를 제조하고 그 모폴로지와 결정성을 분석하였다. 수열반응의 조건에 따라 ${\alpha}$-, ${\beta}$-, ${\gamma}-MnO_2$ 등의 전구체가 제조될 수 있는데, 고농도 반응물 및 높은 수열합성 온도($150^{\circ}C$)에서 전기화학적 활성이 우수한 나노로드 클러스터 ${\beta}-MnO_2$의 생성을 확인하였다. 또한 리튬화제 $LiC_3H_3O_2{\cdot}2H_2O$의 농도와 열처리 온도를 변화시키면서 $MnO_2$를 리튬화하여 스피넬계 $LiMn_2O_4$를 제조하고 리튬이온전지 양전극으로서의 특성을 조사하였다. 결과적으로 나노로드 클러스터형 ${\beta}-MnO_2$로부터 고농도 리튬화제와 $800^{\circ}C$ 열처리를 통해 제조한 $LiMn_2O_4$가 정방형 스피넬에 가장 가까운 구조임을 확인하였으며, 120 mAh/g의 우수한 초기 방전용량을 나타내었다.

Keywords

References

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