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Sn and SnBi Foil as Anode Materials for Secondary Lithium Battery

Published online by Cambridge University Press:  11 February 2011

Shoufeng Yang ,
Peter Y. Zavalij  and
M. Stanley Whittingham
Shoufeng Yang
Affiliation:
Institute for Materials Research, SUNY-Binghamton University, Binghamton, NY 13902
Peter Y. Zavalij
Affiliation:
Institute for Materials Research, SUNY-Binghamton University, Binghamton, NY 13902
M. Stanley Whittingham
Affiliation:
Institute for Materials Research, SUNY-Binghamton University, Binghamton, NY 13902
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Abstract

In order to better understand the cycling mechanism of metal alloy anodes, and to mitigate the capacity fade observed in lithium battery use a study of simple systems was initiated. Tin foil and tin-bismuth mixtures were chosen because there is no need for conductive diluents or binders so that the intrinsic behavior could be observed. A pure tin foil was found to react rapidly with lithium, ≥ 3 mA/cm2, and with no capacity fade for over 10 cycles. This is better than tin powder or electrodeposited tin. After the first cycle, the foil reacts with Li following a stepwise formation of different alloys as dictated by the thermodynamics. Incorporation of bismuth into the foil increased the capacity fade after the first few cycles, with the eutectic composition Sn0.57Bi0.43 having better capacity retention than the Sn0.5Bi0.5 composition. XRD and SEM-EDS shows that bismuth is rejected from the tin rich phase during lithium insertion and is not reincorporated on lithium removal, just as expected from the phase diagram.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE8.4
Copyright
Copyright © Materials Research Society 2003

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