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Issue 14, 2015
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Electrochemical in situ investigations of SEI and dendrite formation on the lithium metal anode

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Abstract

This comparative work studies the self-enforcing heterogeneity of lithium deposition and dissolution as the cause for dendrite formation on the lithium metal anode in various liquid organic solvent based electrolytes. In addition, the ongoing lithium corrosion, its rate and thus the passivating quality of the SEI are investigated in self-discharge measurements. The behavior of the lithium anode is characterized in two carbonate-based standard electrolytes, 1 M LiPF6 in EC/DEC (3 : 7) and 1 M LiPF6 in EC/DMC (1 : 1), and in two alternative electrolytes 1 M LiPF6 in TEGDME and 1 M LiTFSI in DMSO, which have been proposed in the literature as promising electrolytes for lithium metal batteries, more specifically for lithium/air batteries. As a result, electrolyte decomposition, SEI and dendrite formation at the lithium electrode as well as their mutual influences are understood in the development of overpotentials, surface resistances and lithium electrode surface morphologies in subsequent lithium deposition and dissolution processes. A general model of different stages of these processes could be elaborated.

Graphical abstract: Electrochemical in situ investigations of SEI and dendrite formation on the lithium metal anode

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Publication details

The article was received on 15 Dec 2014, accepted on 19 Feb 2015 and first published on 19 Feb 2015


Article type: Paper
DOI: 10.1039/C4CP05865H
Phys. Chem. Chem. Phys., 2015,17, 8670-8679
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    Electrochemical in situ investigations of SEI and dendrite formation on the lithium metal anode

    G. Bieker, M. Winter and P. Bieker, Phys. Chem. Chem. Phys., 2015, 17, 8670
    DOI: 10.1039/C4CP05865H

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