Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 3, Pages 418-421Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.01.008
Keywords
Lithium ion battery; Anode material; Germanium; Mesoporous
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Funding
- National Basic Research Program of China [2007CB209702, 2009CB623506]
- NSFC [20890122, 20873028, 20721063]
- Shanghai Committee of Science and Technology [08DZ2270500, 09QH1400400]
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Mesoporous Ge was prepared by mechanochemical reaction of GeO2 and Mg powders followed by an etching process with HCl solution. It was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and charge-discharge measurement. With a pore-distribution concentrated around 10 nm, the product presents a BET surface area of 49.98 m(2)/g. When using as an anode material for lithium ion battery, the mesoporous Ge exhibits a reversible capacity of 950 mA h/g and retains a capacity of 789 mA h/g after 20 cycles at a current density of 150 mA/g. The cycleability is significantly improved compared with non-porous Ge. (C) 2010 Elsevier B.V. All rights reserved.
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