Abstract
Performance of N-butyl N,N,N-triethylammonium bis(trifluoromethanesulfonyl)-imide (N2224TFSI) as a room temperature ionic liquid (RTIL) containing ethylene carbonate (EC)/diethylcarbonate (DEC) and lithium salt has been investigated as an electrolyte for lithium-ion battery. The electrolyte is highly resistant to fire during direct exposure to the flame, indicating its non-flammable nature. The overall electrochemical window of the ionic liquid (IL) electrolyte is up to 5.7 V vs. Li metal without any solvent decomposition, as confirmed by linear sweep voltammetry (LSV). The electrolyte has low viscosity (32.9 cPs) and high conductivity (5.23 mS cm−1) with effective SEI film-forming ability. The performance of the IL electrolyte has been tested with lithium-ion half cells using LiFePO4 and mesocarbon microbead (MCMB) electrodes, showing good galvanostatic cycling with high capacity retention of about 84 and 90 %, respectively.
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Financial support under the TAP-SUN project (NWP-56) of CSIR is gratefully acknowledged.
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Selvamani, V., Suryanarayanan, V., Velayutham, D. et al. Asymmetric tetraalkyl ammonium cation-based ionic liquid as an electrolyte for lithium-ion battery applications. J Solid State Electrochem 20, 2283–2293 (2016). https://doi.org/10.1007/s10008-016-3248-x
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DOI: https://doi.org/10.1007/s10008-016-3248-x