Issue 26, 2017

Electrochemical Na+ storage properties of SnO2/graphene anodes in carbonate-based and ionic liquid electrolytes

Abstract

Electrolyte formulations are vital for the proper functioning of Na-ion batteries. A systematic study is conducted to optimize the electrolyte for a SnO2/graphene anode, which is prepared via a supercritical-CO2-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 NaClO4 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.

Graphical abstract: Electrochemical Na+ storage properties of SnO2/graphene anodes in carbonate-based and ionic liquid electrolytes

Supplementary files

Article information

Article type
Paper
Submitted
13 Apr 2017
Accepted
28 May 2017
First published
20 Jun 2017

J. Mater. Chem. A, 2017,5, 13776-13784

Electrochemical Na+ storage properties of SnO2/graphene anodes in carbonate-based and ionic liquid electrolytes

H. Chen, J. Patra, S. Lee, C. Tseng, T. Wu, M. Lin and J. Chang, J. Mater. Chem. A, 2017, 5, 13776 DOI: 10.1039/C7TA03226A

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