Arrays of Sealed Silicon Nanotubes As Anodes for Lithium Ion Batteries

Title
Arrays of Sealed Silicon Nanotubes As Anodes for Lithium Ion Batteries
Author(s)
송태섭Jianliang Xia[Jianliang Xia]이진헌[이진헌]이동현[이동현]권문석[권문석]최재만[최재만]Jian Wu[Jian Wu]두석광[두석광]장혁[장혁]박원일[박원일]장동식[장동식]김한수[김한수]Yonggang Huang[Yonggang Huang]Keh-Chih Hwang[Keh-Chih Hwang]John A. Rogers[John A. Rogers]백운규[백운규]
Keywords
HIGH-CAPACITY; SECONDARY BATTERIES; NEGATIVE ELECTRODE; SI ANODE; NANOWIRES; PERFORMANCE; INSERTION; CELLS
Issue Date
201005
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.10, no.5, pp.1710 - 1716
Abstract
Silicon is a promising candidate for electrodes in lithium ion batteries due to its large theoretical energy density. Poor capacity retention, caused by pulverization of Si during cycling, frustrates its practical application. We have developed a nanostructured form of silicon, consisting of arrays of sealed, tubular geometries that is capable of accommodating large volume changes associated with lithiation in battery applications. Such electrodes exhibit high initial Coulombic efficiencies (i.e., >85%) and stable capacity-retention (>80% after 50 cycles), due to an unusual, underlying mechanics that is dominated by free surfaces. This physics is manifested by a strongly anisotropic expansion in which 400% volumetric increases are accomplished with only relatively small (<35%) changes in the axial dimension. These experimental results and associated theoretical mechanics models demonstrate the extent to which nanoscale engineering of electrode geometry can be used to advantage in the design of rechargeable batteries with highly reversible capacity and long-term cycle stability.
URI
http://hdl.handle.net/YU.REPOSITORY/22434http://dx.doi.org/10.1021/nl100086e
ISSN
1530-6984
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공과대학 > 신소재공학부 > Articles
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