Issue 2, 2017

Ether-based solvents significantly improved electrochemical performance for Na-ion batteries with amorphous GeOx anodes

Abstract

We have previously synthesized highly amorphous GeOx powder by a soft chemical method and demonstrated its performance in electrochemical Na insertion–extraction reactions. However, electrolyte decomposition caused large irreversible capacity decay in the first charge–discharge, leading to poor cycling ability. Electrolyte decomposition was accelerated by the large volume change of amorphous GeOx during charge–discharge. Herein, we report the use of ether-based solvents in Na-ion batteries with amorphous GeOx anodes. XPS measurements were used to evaluate the surface state of the electrode after cycling. The surface layer of the electrolyte decomposition products was thin and mainly composed of Na alkoxide. Thus, the electrochemical performance of this system was greatly improved owing to the significant suppression of electrolyte decomposition. Consequently, electrolytes using ether-based solvents are strong candidates for practical use in Na-ion batteries.

Graphical abstract: Ether-based solvents significantly improved electrochemical performance for Na-ion batteries with amorphous GeOx anodes

Supplementary files

Article information

Article type
Paper
Submitted
14 Sep 2016
Accepted
13 Oct 2016
First published
13 Oct 2016

Phys. Chem. Chem. Phys., 2017,19, 1003-1009

Ether-based solvents significantly improved electrochemical performance for Na-ion batteries with amorphous GeOx anodes

T. Kajita and T. Itoh, Phys. Chem. Chem. Phys., 2017, 19, 1003 DOI: 10.1039/C6CP06354C

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