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dc.contributor.author황성주-
dc.date.accessioned2016-08-28T12:08:23Z-
dc.date.available2016-08-28T12:08:23Z-
dc.date.issued2009-
dc.identifier.issn1932-7447-
dc.identifier.otherOAK-5930-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/220262-
dc.description.abstractThe porous hierarchical assembly of lithium-rich Li1+xMnO 3-δ 2D nanoplates as well as isolated 0D nanocrystalline homologues has been synthesized via lithiation reactions of nanostructured manganese oxides under hydrothermal conditions. According to powder X-ray diffraction and electron microscopy, a hydrothermal LiOH treatment for nanostructured δ-MnO2 precursor produces a lithium-rich Li 1+xMnO3-δ phase with the nanoworm-like hierarchically assembled 2D nanoplate morphology. After the lithiation reaction under identical conditions, the 1D nanowires of the α-MnO2 precursor are transformed into the 0D nanoparticles of the Li 1+xMnO3-δ phase. The Mn K-edge X-ray absorption spectroscopic analysis for the lithiated materials clearly demonstrated that tetravalent manganese ions are stabilized in octahedral sites of a Li 2MnO3-type layered structure composed of edge-shared MnO6/LiO6 octahedra. From electrochemical measurements, it was found that the lithiated Li1+xMnO3-δ nanostructured materials show much superior electrode performance over the precursor manganese oxides and bulk lithium-rich manganate. The powder X-ray diffraction analyses for the electrochemically cycled derivatives clearly demonstrated that the improvement of electrode performance after lithiation can be attributed to the phase transformation to the Li-rich Li 1+xMnO3-δ phase with high structural stability. On the basis of the present experimental findings, we are able to conclude that the present phase transformation route provides a new method not only to synthesize nanostructured lithium-rich manganese oxides with controllable dimensionality and morphology but also to improve the electrode performance of nanostructured manganese oxides. © 2009 American Chemical Society.-
dc.languageEnglish-
dc.titleHierarchically assembled 2D nanoplates and 0d nanoparticles of lithium-rich layered lithium manganates applicable to lithium ion batteries-
dc.typeArticle-
dc.relation.issue40-
dc.relation.volume113-
dc.relation.indexSCI-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.startpage17392-
dc.relation.lastpage17398-
dc.relation.journaltitleJournal of Physical Chemistry C-
dc.identifier.doi10.1021/jp904072r-
dc.identifier.wosidWOS:000270362100019-
dc.identifier.scopusid2-s2.0-70350028411-
dc.author.googleBaek J.Y.-
dc.author.googleHa H.-W.-
dc.author.googleKim I.-Y.-
dc.author.googleHwang S.-J.-
dc.contributor.scopusid황성주(7404626171)-
dc.date.modifydate20190901081003-
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자연과학대학 > 화학·나노과학전공 > Journal papers
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