In situ real-time gravimetric and viscoelastic probing of surface films formation on lithium batteries electrodes

Vadim Dargel, Netanel Shpigel, Sergey Sigalov, Prasant Nayak, Mikhael D. Levi, Leonid Daikhin and Doron Aurbach ()
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Vadim Dargel: Bar-Ilan University
Netanel Shpigel: Bar-Ilan University
Sergey Sigalov: Bar-Ilan University
Prasant Nayak: Bar-Ilan University
Mikhael D. Levi: Bar-Ilan University
Leonid Daikhin: Tel Aviv University
Doron Aurbach: Bar-Ilan University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract It is generally accepted that solid–electrolyte interphase formed on the surface of lithium-battery electrodes play a key role in controlling their cycling performance. Although a large variety of surface-sensitive spectroscopies and microscopies were used for their characterization, the focus was on surface species nature rather than on the mechanical properties of the surface films. Here we report a highly sensitive method of gravimetric and viscoelastic probing of the formation of surface films on composite Li4Ti5O12 electrode coupled with lithium ions intercalation into this electrode. Electrochemical quartz-crystal microbalance with dissipation monitoring measurements were performed with LiTFSI, LiPF6, and LiPF6 + 2% vinylene carbonate solutions from which structural parameters of the surface films were returned by fitting to a multilayer viscoelastic model. Only a few fast cycles are required to qualify surface films on Li4Ti5O12 anode improving in the sequence LiPF6

Date: 2017
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DOI: 10.1038/s41467-017-01722-x

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