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Analysis of the solid electrolyte interphase on hard carbon electrodes in sodium-ion batteries

Research output: Contribution to journalArticle

DOI

Open Access Status

  • Embargoed (until 7/02/20)

Author(s)

M. Carboni, J. Manzi, A. R. Armstrong, J. Billaud, Sergio Brutti, R. Younesi

School/Research organisations

Abstract

The composition, morphology and evolution of the solid electrolyte interphase (SEI) formed on hard carbon (HC) electrodes upon cycling in sodium-ion batteries are here investigated. A microporous HC was prepared by pyrolysis of D-(+)-Glucose at 1000°C followed by ball-milling. HC electrodes were galvanostatically cycled at room temperature in sodium-ion half-cells using an aprotic electrolyte of 1 M sodium bis(trifluoromethanesulfonyl)imide dissolved in propylene carbonate with 3 wt% fluoroethylene carbonate additive. The evolution of the electrode/electrolyte interface was studied by impedance spectroscopy upon cycling and ex situ by spectroscopy and microscopy. The irreversible capacity displayed by the HC electrodes in the first galvanostatic cycle is probably due to the accumulation of redox inactive NaxC phases and the precipitation of a porous, organic-inorganic hybrid SEI layer over the HC electrodes. This passivation film further evolves in morphology and composition upon cycling and stabilizes after approximately 10 galvanostatic cycles at low current rates.
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Details

Original languageEnglish
JournalChemElectroChem
VolumeEarly View
Early online date7 Feb 2019
DOIs
Publication statusE-pub ahead of print - 7 Feb 2019

    Research areas

  • Sodium battery, Hard carbon, Solid electrolyte interphase, SEI, Fluoroethylene carbonate

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