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

Tetsuya Kajita, Takashi Itoh

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1003-1009
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number2
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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