Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 26, Pages 6367-6373Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.06.004
Keywords
Nanocomposite; Tin-Antimony based composite; Anode materials; Lithium secondary batteries; Electrochemistry
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Funding
- Seoul National University [R11-2002-102-00000-0]
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At present, graphite (LiC6: 372 mAh g(-1), 840 mAh cm(-3)) is used as the anode material for lithium-ion batteries. However, methods to enhance the energy density, cyclability, initial Coulombic efficiency, and rate capability of lithium-ion batteries are still actively being researched. Here, we report a simple. fast, and novel method for transforming micron-sized Sn and Sb powders into ca. 10 nm- and 2-3 nm-sized SnSb crystallites by mechanochemical synthesis and electrochemical reactions, respectively. These nanocrystallites are uniformly distributed in an amorphous carbon matrix, resulting in a SnSb/C nanocomposite structure. The fabricated SnSb/C nanocomposite showed excellent electrochemical properties, such as a high energy density (1 st charge: 706 mAh g(-1)), long cyclability (ca. 550 mAh g-1 over 300 cycles), good initial Coulombic efficiency (ca. 81%). and a fast rate capability (1C: 590 mAh g(-1), 2C: 550 mAh g(-1)). (c) 2009 Elsevier Ltd. All rights reserved.
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