Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 1, Pages 349-354Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.06.090
Keywords
LiBOB; Electrolyte; Sn electrodes; Impedance spectroscopy; Li-ion battery
Funding
- University of Ulm-University of Rome Sapienza
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The electrochemical behaviour of Sn electrodes in lithium bis(oxalate)borate (LiBOB)-based electrolyte Li-ion cells is studied by using a carbon-free electrodeposited Sn electrode and a nano-structured Sn-C composite electrode. Cyclic voltammetry, galvanostatic cycling tests, and potentiostatic impedance spectroscopy demonstrate that the presence of carbon promotes the decomposition of the LiBOB-based electrolyte starting at a voltage value of around 1.75V vs. Li/Li+. The LiBOB electrolyte decomposition is probably associated with the formation of a high electrode-electrolyte interphase impedance which limits the rate capability. A reduction of the overall impedance and an increase of the electrode rate capability can be achieved by using a pre-treated (pre-lithiated) Sn-C electrode. It is shown that the pretreatment also reduces the irreversible capacity of the Sn-C electrode and allows to successfully assemble full Li-ion cells. (C) 2010 Elsevier B.V. All rights reserved.
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