Germanium–single-wall carbon nanotube anodes for lithium ion batteries
High-capacity thin-film germanium was coupled with free-standing single-wall carbon nanotube (SWCNT) current collectors as a novel lithium ion battery anode. A series of Ge–SWCNT compositions were fabricated and characterized by scanning electron microscopy and Raman spectroscopy. The lithium ion st...
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Published in | Journal of materials research Vol. 25; no. 8; pp. 1441 - 1446 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York, USA
Cambridge University Press
01.08.2010
Springer International Publishing |
Subjects | |
Online Access | Get full text |
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Summary: | High-capacity thin-film germanium was coupled with free-standing single-wall carbon nanotube (SWCNT) current collectors as a novel lithium ion battery anode. A series of Ge–SWCNT compositions were fabricated and characterized by scanning electron microscopy and Raman spectroscopy. The lithium ion storage capacities of the anodes were measured to be proportional to the Ge weight loading, with a 40 wt% Ge–SWCNT electrode measuring 800 mAh/g. Full batteries comprising a Ge–SWCNT anode in concert with a LiCoO2 cathode have demonstrated a nominal voltage of 3.35 V and anode energy densities 3× the conventional graphite-based value. The higher observed energy density for Ge–SWCNT anodes has been used to calculate the relative improvement in full battery performance when capacity matched with conventional cathodes (e.g., LiCoO2, LiNiCoAlO2, and LiFePO4). The results show a >50% increase in both specific and volumetric energy densities, with values approaching 275 Wh/kg and 700 Wh/L. |
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Bibliography: | istex:B45C633E9A7A3464B10942415F50CB637129BB84 ArticleID:00750 ark:/67375/6GQ-8KRT1241-G PII:S0884291400007500 |
ISSN: | 0884-2914 2044-5326 |
DOI: | 10.1557/JMR.2010.0184 |