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Issue 23, 2017, Issue in Progress
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Intercalation behaviour of magnesium into natural graphite using organic electrolyte systems

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Abstract

The focus of this study is on the investigation of electrochemical intercalation and deintercalation behaviour of Mg2+ into natural graphite electrodes in organic electrolyte. We used as a conductive salt magnesium bis(trifluoromethylsulfonyl)imide (Mg(TFSI)2) dissolved in N,N-dimethylformamide (DMF) as organic solvent. By utilization of conductivity measurements within a broad temperature range (−20 °C to +60 °C), a conductivity maximum is to be found at a concentration of 0.5 M for all temperatures. Thus, in this study all electrochemical investigations dealing with magnesiation of graphite anodes are made with the electrolyte system 0.5 M Mg(TFSI)2/DMF. In three electrode cells (Swagelok© T-cells) we obtain cathodic and anodic currents, which are highly reversible and last for more than 100 cycles showing a coulombic efficiency above 98%. SEM images reveal a non-destructive intercalation of cationic species into graphite and the formation of a magnesiated graphite intercalation compound is confirmed by ex situ XRD diffraction measurements.

Graphical abstract: Intercalation behaviour of magnesium into natural graphite using organic electrolyte systems

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Publication details

The article was received on 16 Dec 2016, accepted on 20 Feb 2017 and first published on 02 Mar 2017


Article type: Paper
DOI: 10.1039/C6RA28300D
Citation: RSC Adv., 2017,7, 14168-14175
  • Open access: Creative Commons BY-NC license
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    Intercalation behaviour of magnesium into natural graphite using organic electrolyte systems

    C. God, B. Bitschnau, K. Kapper, C. Lenardt, M. Schmuck, F. Mautner and S. Koller, RSC Adv., 2017, 7, 14168
    DOI: 10.1039/C6RA28300D

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