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Role of N-Propyl-N-Methyl Pyrrolidinium bis(trifluoromethanesulfonyl)imide as an electrolyte additive in sodium battery electrochemistry
journal contribution
posted on 2018-11-01, 00:00 authored by C V Manohar, Maria ForsythMaria Forsyth, D R MacFarlane, S MitraElectrolyte compatibility with sodium metal and known sodium-ion battery cathodes is of intense interest recently. In this work, electrolytes including an ionic liquid (IL) additive are formulated and shown to enhance the properties of the well-known Na3V2(PO4)3/C (NVP/C) cathode. NVP/C composite material was synthesized by a carbothermal reduction process and studied in cells containing either organic electrolyte (1 M NaClO4 in PC) or organic electrolyte with added [C3mpyr][NTf2] IL. In an electrolyte containing 5 wt % [C3mpyr][NTf2] IL, the cathode material exhibited a stable capacity of 107.0±0.7 mAh g−1 after 50 cycles at a C/2 rate; in contrast, the capacity obtained with the organic electrolyte was only 85±1 mAh g−1 after 50 similar cycles. In situ impedance spectroscopy revealed that the electrode-electrolyte charge-transfer resistance is lower in the organic electrolyte with IL. Consistent with this finding, XPS, SEM, EDX and TEM results indicate that the interfacial layer formed on the surface of the NVP/C cathode material in the presence of the IL is more compact than that formed in the organic electrolyte, and that reaction between cathode and electrolyte is suppressed by the IL.
History
Journal
Energy technologyVolume
6Issue
11Pagination
2232 - 2237Publisher
WileyLocation
Chichester, Eng.Publisher DOI
ISSN
2194-4288eISSN
2194-4296Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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