Stable cycling of NaFePO4 cathodes in high salt concentration ionic liquid electrolytes
Version 2 2024-06-05, 03:41Version 2 2024-06-05, 03:41
Version 1 2018-11-27, 10:42Version 1 2018-11-27, 10:42
journal contribution
posted on 2024-06-05, 03:41 authored by M Hilder, Patrick HowlettPatrick Howlett, D Saurel, H Anne, M Casas‐Cabanas, M Armand, T Rojo, DR MacFarlane, Maria ForsythMaria Forsyth© 2018 Elsevier B.V. Highly concentrated solutions of sodium bis(fluorosulfonyl)imide (NaFSI) with a series of bis(fluorosulfonyl)imide-based ionic liquids incorporating either alkyl phosphonium or alkoxy ammonium cations (P111i4FSI:NaFSI, P1i4i4i4FSI:NaFSI), N2(2O2O1)3FSI:NaFSI) are combined with NaFePO4 cathodes to demonstrate excellent cycling performance with respect to potential range, rate capability, cycle life and elevated temperature stability. With a capacity of 85 mAhg−1 and a capacity retention of 95% over 100 cycles (50 °C, C/2) P111i4FSI:NaFSI matches or outperforms conventional organic solvent based electrolytes as well as other ionic liquid electrolytes in terms of capacity, elevated temperature performance and cycle stability. The electrolyte conductivity does not correlate with the capacity, suggesting that this is not the primary factor determining the cell performance. The solid electrolyte interphase determines the cycle stability with SEM and XPS techniques suggesting the presence of NaOH, Na2S and NaF on the Na metal surface post cycling.
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Journal
Journal of Power SourcesVolume
406Pagination
70-80Location
Amsterdam, The NetherlandsPublisher DOI
ISSN
0378-7753eISSN
1873-2755Language
EnglishPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, ElsevierPublisher
ELSEVIER SCIENCE BVUsage metrics
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Science & TechnologyPhysical SciencesTechnologyChemistry, PhysicalElectrochemistryEnergy & FuelsMaterials Science, MultidisciplinaryChemistryMaterials ScienceSODIUM SECONDARY BATTERYCHARGE-DISCHARGE PERFORMANCEPOSITIVE ELECTRODEELECTROCHEMICAL PERFORMANCEPHYSICOCHEMICAL PROPERTIESENERGY-STORAGELOW-COSTBEHAVIORCHEMISTRYNACRO23401 Analytical chemistry3406 Physical chemistry3499 Other chemical sciences
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