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Averting cracks caused by insertion reaction in lithium–ion batteries

Published online by Cambridge University Press:  31 January 2011

Yuhang Hu ,
Xuanhe Zhao  and
Zhigang Suo
Zhigang Suo*
Affiliation:
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
*
a)Address all correspondence to this author. e-mail: suo@seas.harvard.edu
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Abstract

In a lithium-ion battery, both electrodes are atomic frameworks that host mobile lithium ions. When the battery is being charged or discharged, lithium ions diffuse from one electrode to the other. Such an insertion reaction deforms the electrodes and may cause the electrodes to crack. This paper uses fracture mechanics to determine the critical conditions to avert insertion-induced cracking. The method is applied to cracks induced by the mismatch between phases in LiFePO4.

Keywords

Fracture
Type
Materials Communications
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1007 - 1010
Copyright
Copyright © Materials Research Society 2010

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