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Energies 2013, 6(7), 3481-3505; doi:10.3390/en6073481
Article

Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance

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Received: 3 May 2013; in revised form: 14 June 2013 / Accepted: 3 July 2013 / Published: 15 July 2013
(This article belongs to the Special Issue Li-ion Batteries and Energy Storage Devices)
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Abstract: A new approach to study the chemical stability of electrodeposited lithium on a copper metal substrate via measurements with a fast impedance scanning electrochemical quartz crystal microbalance is presented. The corrosion of electrochemically deposited lithium was compared in two different electrolytes, based on lithium difluoro(oxalato) borate (LiDFOB) and lithium hexafluorophosphate, both salts being dissolved in solvent blends of ethylene carbonate and diethyl carbonate. For a better understanding of the corrosion mechanisms, scanning electron microscopy images of electrodeposited lithium were also consulted. The results of the EQCM experiments were supported by AC impedance measurements and clearly showed two different corrosion mechanisms caused by the different salts and the formed SEIs. The observed mass decrease of the quartz sensor of the LiDFOB-based electrolyte is not smooth, but rather composed of a series of abrupt mass fluctuations in contrast to that of the lithium hexafluorophosphate-based electrolyte. After each slow decrease of mass a rather fast increase of mass is observed several times. The slow mass decrease can be attributed to a consolidation process of the SEI or to the partial dissolution of the SEI leaving finally lithium metal unprotected so that a fast film formation sets in entailing the observed fast mass increases.
Keywords: lithium metal anodes; lithium difluoro(oxalato)borate; LiDFOB; SEI; lithium corrosion; anode stability lithium metal anodes; lithium difluoro(oxalato)borate; LiDFOB; SEI; lithium corrosion; anode stability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Schedlbauer, T.; Hoffmann, B.; Krüger, S.; Gores, H.J.; Winter, M. Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance. Energies 2013, 6, 3481-3505.

AMA Style

Schedlbauer T, Hoffmann B, Krüger S, Gores HJ, Winter M. Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance. Energies. 2013; 6(7):3481-3505.

Chicago/Turabian Style

Schedlbauer, Tanja; Hoffmann, Björn; Krüger, Steffen; Gores, Heiner J.; Winter, Martin. 2013. "Results from a Novel Method for Corrosion Studies of Electroplated Lithium Metal Based on Measurements with an Impedance Scanning Electrochemical Quartz Crystal Microbalance." Energies 6, no. 7: 3481-3505.


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