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Journal of Chemistry
Volume 2019, Article ID 7980204, 10 pages
https://doi.org/10.1155/2019/7980204
Research Article

Carbonate Solvents and Ionic Liquid Mixtures as an Electrolyte to Improve Cell Safety in Sodium-Ion Batteries

1Applied Physical Chemistry Laboratory (APCLAB), VNU HCM-University of Science, 227 Nguyen Van Cu street, District 5, Ho Chi Minh City, Vietnam
2Biomass Laboratory, VNU HCM-University of Technology, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam
3Department of Physical Chemistry, Faculty of Chemistry, VNU HCM-University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam

Correspondence should be addressed to P. L. M. Le; nv.ude.sumch@gnuhplml

Received 2 April 2019; Revised 7 June 2019; Accepted 25 June 2019; Published 24 July 2019

Academic Editor: Francisco Javier Deive

Copyright © 2019 T. D. Vo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ionic liquid-based electrolytes proved to be effective in terms of alleviating the safety problems associated with lithium/sodium ion batteries, especially for large-scale applications, due to their superior thermal stability and nonflammability. The main disadvantage of ionic liquids is their relatively high viscosity. Adding a suitable amount of organic “thinning” solvents could be a potential solution for this problem: while the electrolyte viscosity is greatly reduced, the electrochemical properties and thermal stability remain almost as good as those of pure ionic liquid. In this study, electrolyte mixtures based on 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) (EMI-TFSI) and carbonate solvents (EC-PC) were prepared. The electrochemical compatibility in half-cell configuration with respect to sodium metal anode of various electrode materials, including SnS/C, hard carbon (HC), and Na0.44MnO2, was evaluated. Moreover, the thermal stability, the flammability, and the conduction mechanism of such electrolyte mixtures were also explored and discussed.