New insights into the uptake/release of FTFSI − anions into graphite by means of in situ powder X-ray diffraction

Meister, Paul; Schmuelling, Guido; Placke, Tobias; Winter, Martin

doi:10.1016/j.elecom.2016.08.003

Journal Article

FZJ-2017-02818

New insights into the uptake/release of FTFSI − anions into graphite by means of in situ powder X-ray diffraction

Meister, P.FZJ* ; Schmuelling, G. ; Winter, M. (Corresponding author)FZJ* ; Placke, T. (Corresponding author)

2016
Elsevier Science Amsterdam [u.a.]

Electrochemistry communications 71, 52 - 55 (2016) [10.1016/j.elecom.2016.08.003]

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Please use a persistent id in citations: doi:10.1016/j.elecom.2016.08.003

Abstract: The redox-amphoteric character of graphite enables its utilization as intercalation host for various types of cations and anions to form either donor-type or acceptor-type graphite intercalation compounds (GICs), respectively. While the donor-type GIC LiC6 is commonly used in the field of lithium ion batteries, acceptor-type GICs were suggested for application in dual-ion cells. In this contribution, the electrochemical intercalation/de-intercalation of fluorosulfonyl-(trifluoromethanesulfonyl) imide (FTFSI−) anions into graphite was studied for dual-ion cells during a cyclic voltammetry experiment using in situ powder X-ray diffraction. For the GICs, a series of most dominant stages could be assigned and the periodic repeat distance as well as the FTFSI− gallery height/gallery expansion were determined. The obtained dominant stage numbers of the formed GICs were correlated to cell voltage ranges. Upon charge, a transition of the different stages was observed, while upon discharge stage 1 was still preserved for a broad voltage range. These novel findings indicate different mechanisms for the uptake and release of the anions.

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