Hybrid Tin Oxide Nanowires as Stable and High Capacity Anodes for Li-Ion Batteries

In this report, we present a simple and generic concept involving metal nanoclusters supported on metal oxide nanowires as stable and high capacity anode materials for Li-ion batteries. Specifically, SnO2 nanowires covered with Sn nanoclusters exhibited an exceptional capacity of >800 mAhg−1 over...

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Bibliographic Details
Published in:Nano letters 2009-02, Vol.9 (2), p.612-616
Main Authors: Meduri, Praveen, Pendyala, Chandrashekhar, Kumar, Vivekanand, Sumanasekera, Gamini U, Sunkara, Mahendra K
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
Quantum wires
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Summary:In this report, we present a simple and generic concept involving metal nanoclusters supported on metal oxide nanowires as stable and high capacity anode materials for Li-ion batteries. Specifically, SnO2 nanowires covered with Sn nanoclusters exhibited an exceptional capacity of >800 mAhg−1 over hundred cycles with a low capacity fading of less than 1% per cycle. Post lithiation analyses after 100 cycles show little morphological degradation of the hybrid nanowires. The observed, enhanced stability with high capacity retention is explained with the following: (a) the spacing between Sn nanoclusters on SnO2 nanowires allowed the volume expansion during Li alloying and dealloying; (b) high available surface area of Sn nanoclusters for Li alloying and dealloying; and (c) the presence of Sn nanoclusters on SnO2 allowed reversible reaction between Sn and Li2O to produce both Sn and SnO phases.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl802864a