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  • 08월 28일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Hydrothermal Synthesis and Electrochemical Characterization of the 3D Hierarchical Spheres of lithium manganese oxide Nanoplates

등록일
2008년 8월 12일 11시 46분 29초
접수번호
1288
발표코드
36P260포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅳ>
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
백자연, 하형욱, 황성주
이화여자대학교 화학·나노과학과, Korea
We have synthesized the 3D hierarchical assembly of spinel(LiMn2O4) nanoplates and layered 0D nanocrystalline (LiMnO2) homologue through a low temperature hydrothermal treatment for nanostructured lithium manganese oxides in an aqueous basic medium. According to powder X-ray diffraction and electron microscopic analyses, the 3D spheres composed of spinel nanoplates could be prepared from the hydrothermal reaction between excess LiOH and layered δ-MnO2 nanostructures whereas the hydrothermal alkali treatments for the 1D nanowires of α-MnO2 led to the synthesis of the well-crystalline layered 0D nanocrystals. Mn K-edge X-ray absorption spectroscopy clearly demonstrated that tetravalent manganese ions are stabilized in the octahedral site of nanostructured layered lattice, whereas spinel nanoplate has lower average oxidation state of >+3.5. According to electrochemical measurements, the obtained nanostructured materials showed better electrode performance compared with bulk LiMn2O4 and bulk LiMnO2. The present study clearly demonstrated that the phase transformation of the nanostructured α-MnO2 and δ-MnO2 precursors can provide useful routes to nanostructured lithium manganese oxides with various dimensionality and morphologies.

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