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Si/Ge Double-Layered Nanotube Array as a Lithium Ion Battery Anode

Title
Si/Ge Double-Layered Nanotube Array as a Lithium Ion Battery Anode
Other Titles
Ge Double-Layered Nanotube Array as a Lithium Ion Battery Anode
Author
백운규
Keywords
silicon; germanium; nanotubes; anode; lithium ion batteries
Issue Date
2012-01
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Citation
ACS NANO, 권: 6, 호: 1, 페이지: 303-309
Abstract
Problems related to tremendous volume changes associated with cycling and the low electron conductivity and ion diffusivity of Si represent major obstacles to Its use in high-capacity anodes for lithium ion batteries. We have developed a group IVA based nanotube heterostructure array, consisting of a high-capacity Si Inner layer and a highly conductive Ge outer layer, to yield both favorable mechanics and kinetics in battery applications. This type of Si/Ge double-layered nanotube array electrode Milks improved electrochemical performances over the analogous homogeneous Si system, including stable capacity retention (85% after 50 cycles) and doubled capacity at a 3C rate. These result stem from reduced maximum hoop strain In the nanotubes, supported by theoretical mechanics modeling, and lowered activation energy barrier for Li diffusion. This electrode technology creates opportunities in the development of group IVA nanotube heterostructures for next generation lithium Ion batteries.
URI
https://pubs.acs.org/doi/abs/10.1021/nn203572n
ISSN
1936-0851; 1936-086X
DOI
10.1021/nn203572n
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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