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Title: Effect of conducting salts in ionic liquid electrolytes for enhanced cyclability of sodium-ion batteries
Authors: Do, Minh Phuong
Bucher, Nicolas
Nagasubramanian, Arun
Markovits, Iulius
Tian, Bingbing
Fischer, Pauline J.
Loh, Kian Ping
Kühn, Fritz E.
Srinivasan, Madhavi
Keywords: Engineering::Materials
Issue Date: 2019
Source: Do, M. P., Bucher, N., Nagasubramanian, A., Markovits, I., Tian, B., Fischer, P. J., . . . Srinivasan, M. (2019). Effect of conducting salts in ionic liquid electrolytes for enhanced cyclability of sodium-ion batteries. ACS Applied Materials & Interfaces, 11(27), 23972-23981. doi:10.1021/acsami.9b03279
Project: NRF2016NRF-NRF1001-22 
Journal: ACS Applied Materials & Interfaces 
Abstract: The electrochemical performance of ionic liquid electrolytes containing different sodium salts dissolved in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI) evaluated in a half-cell configuration using spherical P2-Na0.6Co0.1Mn0.9O2+z (NCO) cathodes are reported. Among the various electrolytes investigated, sodium bis(fluorosulfonyl)imide (NaFSI) (0.5 M) in BMPTFSI shows the best electrochemical performance with a significant improvement in cycling stability (90% capacity retention after 500 cycles at 50 mA g–1 in a half cell versus Na metal anode) compared with conventional NaClO4 (1 M) in ethylene carbonate/propylene carbonate electrolytes (39% retention after 500 cycles). Cyclic voltammetry (CV) studies reveal that ionic liquid electrolytes are stable up to 4.8 V versus Na/Na+. When NaFSI and NaTFSI are used as conducting salts, X-ray photoelectron spectroscopy results prove that the cathode electrolyte interface (CEI) is composed of components resulting from the decomposition of the TFSI anion and the deposition of the BMP cation. On the other hand, the CEI layer of the electrode cycled in an electrolyte containing NaClO4 in BMPTFSI follows a different pathway of TFSI decomposition and consists mainly of sodium fluoride. Similarly, plating studies were used to understand the stability of different ionic liquids in contact with metallic sodium. It was found that the excellent capacity retention for the electrolyte consisting of NaFSI salt is related to the formation of a stable CEI and solid electrolyte interphase layers.
ISSN: 1944-8244
DOI: 10.1021/acsami.9b03279
Schools: School of Materials Science and Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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