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
Author(s)
송태섭Huanyu Cheng[Huanyu Cheng]Heechae Choi[Heechae Choi]Jin-Hyon Lee[Jin-Hyon Lee]Hyungkyu Han[Hyungkyu Han]Dong Hyun Lee[Dong Hyun Lee]Dong Su Yoo[Dong Su Yoo]Moon-Seok Kwon[Moon-Seok Kwon]Jae-Man Choi[Jae-Man Choi]Seok Gwang Doo[Seok Gwang Doo]Hyuk Chang[Hyuk Chang]Jianliang Xiao[Jianliang Xiao]Yonggang Huang[Yonggang Huang]Won Il Park[Won Il Park]Yong-Chae Chung[Yong-Chae Chung]Hansu Kim[Hansu Kim]John A. Rogers[John A. Rogers]Ungyu Paik[Ungyu Paik]
Keywords
FIELD-EFFECT TRANSISTORS; SEMICONDUCTOR NANOWIRES; HIGH-CAPACITY; AB-INITIO; GERMANIUM; ELECTRODES; POINTS; GROWTH
Issue Date
201201
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.6, no.1, pp.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
http://hdl.handle.net/YU.REPOSITORY/30050http://dx.doi.org/10.1021/nn203572n
ISSN
1936-0851
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공과대학 > 신소재공학부 > Articles
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