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Electrochemically active nanocomposites of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals with improved electrode performance

Title
Electrochemically active nanocomposites of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals with improved electrode performance
Authors
Han S.Y.Kim I.Y.Lee S.-H.Hwang S.-J.
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2012
Journal Title
Electrochimica Acta
ISSN
0013-4686JCR Link
Citation
vol. 74, pp. 59 - 64
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Electrochemically active nanocomposites consisting of Li 4Ti 5O 12 2D nanosheets and SnO 2 0D nanocrystals are synthesized by the crystal growth of tin dioxide on the surface of 2D nanostructured lithium titanate. According to powder X-ray diffraction and electron microscopic analyses, the rutile-structured SnO 2 nanocrystals are stabilized on the surface of spinel-structured Li 4Ti 5O 12 2D nanosheets. The homogeneous hybridization of tin dioxide with lithium titanate is confirmed by elemental mapping analysis. Ti K-edge X-ray absorption near-edge structure and Sn 3d X-ray photoelectron spectroscopy indicate the stabilization of tetravalent titanium ions in the spinel lattice of Li 4Ti 5O 12 and the formation of SnO 2 phase with tetravalent Sn oxidation state. The electrochemical measurements clearly demonstrate the promising functionality of the present nanocomposites as anode for lithium secondary batteries. The Li 4Ti 5O 12-SnO 2 nanocomposites show larger discharge capacity and better cyclability than do the uncomposited Li 4Ti 5O 12 and SnO 2 phases, indicating the synergistic effect of nanocomposite formation on the electrode performance of Li 4Ti 5O 12 and SnO 2. The present experimental findings underscore the validity of 2D nanostructured lithium titanate as a useful platform for the stabilization of nanocrystalline electrode materials and also for the improvement of their functionality. © 2012 Elsevier Ltd.
DOI
10.1016/j.electacta.2012.03.175
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자연과학대학 > 화학·나노과학전공 > Journal papers
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