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Synergetic Effect of Ethyl Methyl Carbonate and Trimethyl Phosphate on BF4 Intercalation into a Graphite Electrode

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journal contribution
posted on 27.02.2019 by Lei Zhang, Jiayu Li, Yuhao Huang, Dandan Zhu, Hongyu Wang
LiBF4–ethyl methyl carbonate (EMC)-based solutions have not been successfully employed in dual-ion batteries (DIBs) mainly on account of few solvated BF4 intercalations into graphite positive electrodes. In this article, trimethyl phosphate (TMP) is introduced into 1 M LiBF4–EMC solution as the electrolyte solution for DIBs, thus revealing a synergetic effect in which the discharge capacity for the anion storage using 1 M LiBF4–EMC/TMP (8:2 by vol) (ca. 26.7 mA h g–1) is far superior to that for the batteries using 1 M LiBF4–EMC (ca. 2.7 mA h g–1) or 1 M LiBF4–TMP (ca. 1.1 mA h g–1). In this case, the effects of TMP on LiBF4 in 1 M LiBF4–EMC/TMP electrolyte solutions are explored by conventional electrochemical tests, ex situ X-ray diffraction, in situ Raman spectroscopy, and nuclear magnetic resonance.

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