This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1016/j.elecom.2016.08.003 in citations.
New insights into the uptake/release of FTFSI − anions into graphite by means of in situ powder X-ray diffraction
New insights into the uptake/release of FTFSI − anions into graphite by means of in situ powder X-ray diffraction
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 io...
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Personal Name(s): | Meister, Paul |
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Schmuelling, Guido / Winter, Martin (Corresponding author) / Placke, Tobias (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 |
Published in: | Electrochemistry communications, 71 (2016) S. 52 - 55 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2016
|
DOI: |
10.1016/j.elecom.2016.08.003 |
Document Type: |
Journal Article |
Research Program: |
Electrochemical Storage |
Publikationsportal JuSER |
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. |