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Volume 176, 2014
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In situ TEM study of the Li–Au reaction in an electrochemical liquid cell

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Abstract

We study the lithiation of a Au electrode in an electrochemical liquid cell using transmission electron microscopy (TEM). The commercial liquid electrolyte for lithium ion batteries (1 M lithium hexafluorophosphate LiPF6 dissolved in 1 : 1 (v/v) ethylene carbonate (EC) and diethyl carbonate (DEC)) was used. Three distinct types of morphology change during the reaction, including gradual dissolution, explosive reaction and local expansion/shrinkage, are observed. It is expected that significant stress is generated from lattice expansion during lithium–gold alloy formation. There is vigorous bubble formation from electrolyte decomposition, likely due to the catalytic effect of Au, while the bubble generation is less severe with titanium electrodes. There is an increase of current in response to electron beam irradiation, and electron beam effects on the observed electrochemical reaction are discussed.

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Submitted
01 Jul 2014
Accepted
24 Jul 2014
First published
24 Jul 2014

Faraday Discuss., 2014,176, 95-107
Article type
Paper
Author version available

In situ TEM study of the Li–Au reaction in an electrochemical liquid cell

Z. Zeng, Wen-I. Liang, Y. Chu and H. Zheng, Faraday Discuss., 2014, 176, 95
DOI: 10.1039/C4FD00145A

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