期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 5, 页码 1490-1493出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201409530
关键词
carbon nanotubes; electrochemistry; lithium-ion batteries; nanoparticles; tin anode
资金
- U.S. Department of Energy [DE-EE0003208]
- Johnson Controls, Inc.
Tin is a promising anode candidate for next-generation lithium-ion batteries with a high energy density, but suffers from the huge volume change (ca. 260%) upon lithiation. To address this issue, here we report a new hierarchical tin/carbon composite in which some of the nanosized Sn particles are anchored on the tips of carbon nanotubes (CNTs) that are rooted on the exterior surfaces of micro-sized hollow carbon cubes while other Sn nanoparticles are encapsulated in hollow carbon cubes. Such a hierarchical structure possesses a robust framework with rich voids, which allows Sn to alleviate its mechanical strain without forming cracks and pulverization upon lithiation/de-lithiation. As a result, the Sn/C composite exhibits an excellent cyclic performance, namely, retaining a capacity of 537 mAhg(-1) for around 1000 cycles without obvious decay at a high current density of 3000 mAg(-1).
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