Electrochemical Na + storage properties of SnO 2 /graphene anodes in carbonate-based and ionic liquid electrolytes

Hung Ching Chen, Jagabandhu Patra, Sheng Wei Lee, Chung Jen Tseng, Tzi Yi Wu, Ming Hsein Lin, Jeng-Kuei Chang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Electrolyte formulations are vital for the proper functioning of Na-ion batteries. A systematic study is conducted to optimize the electrolyte for a SnO 2 /graphene anode, which is prepared via a supercritical-CO 2 -assisted synthesis method. The effects of a propylene carbonate (PC) and ethylene carbonate (EC) solvent combination and a fluoroethylene carbonate (FEC) additive on the electrode charge-discharge properties are examined. Incorporations of EC and FEC promote the formation of a more robust solid electrolyte interphase layer, improving the cyclic stability of the electrode compared to that found for an electrode in a PC-only electrolyte containing 1 M NaClO 4 salt. Nevertheless, at 60 °C, an N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid electrolyte clearly outperforms the PC/EC/FEC carbonate-based electrolyte in terms of electrode capacity, rate capability, and cyclic stability. This work indicates that the electrode sodiation/desodiation performance remarkably depends on the electrolyte composition, which should be optimized for various application demands and operation temperatures of batteries.

Original languageEnglish
Pages (from-to)13776-13784
Number of pages9
JournalJournal of Materials Chemistry A
Volume5
Issue number26
DOIs
StatePublished - 1 Jan 2017

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