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나노 구조 물리 연구단
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Hollow carbon nanospheres/silicon/alumina core-shell film as an anode for lithum-ion batteries

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Title
Hollow carbon nanospheres/silicon/alumina core-shell film as an anode for lithum-ion batteries
Author(s)
Bing Li; Fei Yao; Jung Jun Bae; Jian Chang; Mihai Robert Zamfir; Duc Toan Le; Duy Tho Pham; Hongyan Yue; Young Hee Lee
Publication Date
2015-01
Journal
SCIENTIFIC REPORTS, v.5, no., pp.7659 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Hollow carbon nanospheres/silicon/alumina (CNS/Si/Al2O3) core-shell films obtained by the deposition of Si and Al2O3 on hollow CNS interconnected films are used as the anode materials for lithium-ion batteries. The hollow CNS film acts as a three dimensional conductive substrate and provides void space for silicon volume expansion during electrochemical cycling. The Al2O3 thin layer is beneficial to the reduction of solid-electrolyte interphase (SEI) formation. Moreover, as-designed structure holds the robust surface-to-surface contact between Si and CNSs, which facilitates the fast electron transport. As a consequence, the electrode exhibits high specific capacity and remarkable capacity retention simultaneously: 1560 mA h g21 after 100 cycles at a current density of 1 A g21 with the capacity retention of 85% and an average decay rate of 0.16% per cycle. The superior battery properties are further confirmed by cyclic voltammetry (CV) and impedance measurement.
URI
http://pr.ibs.re.kr/handle/8788114/828
DOI
10.1038/srep07659
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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