Hexafluorophosphate anion intercalation into graphite electrode from sulfolane/ethylmethyl carbonate solutions

Hexafluorophosphate anion intercalation into graphite electrode from sulfolane/ethylmethyl carbonate solutions

The electrochemical behaviour of graphite positive electrode has been tested in the electrolyte solutions of 1moldm−3 LiPF6 dissolved in mixed solvents of sulfolane (SL) and ethylmethyl carbonate (EMC). The suppression of PF6− anion intercalation into graphite by SL has been demonstrated. Moreover,...

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Veröffentlicht in:Electrochimica acta 2016-01, Vol.189, p.9-15
Hauptverfasser: Fan, Hui, Gao, Jichao, Qi, Li, Wang, Hongyu
Format: Artikel
Sprache:eng
Schlagworte:
Anions
Carbonates
Cycles
Electrodes
Electrolytes
Ethylmethyl carbonate
Graphite
Graphite intercalation compounds
Hexafluorophosphate
Intercalation
Solvation effect
Solvents
Sulfolane
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Zusammenfassung:The electrochemical behaviour of graphite positive electrode has been tested in the electrolyte solutions of 1moldm−3 LiPF6 dissolved in mixed solvents of sulfolane (SL) and ethylmethyl carbonate (EMC). The suppression of PF6− anion intercalation into graphite by SL has been demonstrated. Moreover, the favourable effect of EMC on PF6− insertion into graphite in SL-based solutions has been verified by ex situ XRD, ex situ Raman, and electrochemical tests. Furthermore, improved long-term cycling performance of graphite positive electrode has been obtained in solutions with suitable ratios of SL and EMC.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2015.12.078