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

Lei Zhang; Jiayu Li; Yuhao Huang; Dandan Zhu; Hongyu Wang

doi:10.1021/acs.langmuir.9b00262

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

Langmuir. 2019 Mar 19;35(11):3972-3979. doi: 10.1021/acs.langmuir.9b00262. Epub 2019 Mar 8.

Authors

Lei Zhang^{1

2}, Jiayu Li^{1

2}, Yuhao Huang^{1

2}, Dandan Zhu^{1

2}, Hongyu Wang^{1

2}

Affiliations

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , 5625 Renmin Street , Changchun 130022 , China.
² School of Applied Chemistry and Engineering , University of Science and Technology of China , Hefei 230026 , China.

PMID: 30811939
DOI: 10.1021/acs.langmuir.9b00262

Abstract

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.