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Density modulated multilayer silicon thin films as li-ion battery anodes

Published online by Cambridge University Press:  20 July 2012

M. Taha Demirkan ,
Xin Li ,
Bingqing Wei  and
Tansel Karabacak
M. Taha Demirkan
Affiliation:
Department of Applied Science, University of Arkansas at Little Rock, Little Rock, AR 72204
Xin Li
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark, DE 19716
Bingqing Wei
Affiliation:
Department of Mechanical Engineering, University of Delaware, Newark, DE 19716
Tansel Karabacak
Affiliation:
Department of Applied Science, University of Arkansas at Little Rock, Little Rock, AR 72204
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Abstract

In this work, we demonstrate a new density modulated multilayered silicon thin film anode approach that can provide a robust high capacity electrode for Li-ion batteries. These films have the ability to tolerate large volume changes due to their controlled microstructure. Silicon films with alternating layers of high/low material density were deposited using a DC sputtering system. Density of the individual layers was controlled by simply changing the working gas pressure during sputtering. Samples of Si films having thicknesses of 460 nm with different number of high/low density layers have been deposited on Cu current collectors. The electrochemical performance of the multilayered anode material was evaluated using a galvanostatic battery testing system at C/10 rate. After reaching a stabilized phase the battery cell showed a high coulombic efficiency of 96% to 99% and reversible specific capacity of 666 mAh g-1 (after 100 cycles). Low-density layers are believed to be acting as compliant sheets during volume expansion making the films more durable compared to conventional Si film anodes. The results indicate that density modulated multilayer Si thin films can be used to improve the mechanical properties of Li-ion battery anodes leading to high reversible capacity values even after high number of cycles.

Keywords

thin filmsputteringLi
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1440: Symposium O – Next-Generation Energy Storage Materials and Systems , 2012 , mrss12-1440-o09-47
Copyright
Copyright © Materials Research Society 2012

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