TY  - JOUR
AU  - Meister, Paul
AU  - Schmuelling, Guido
AU  - Winter, Martin
AU  - Placke, Tobias
TI  - New insights into the uptake/release of FTFSI − anions into graphite by means of in situ powder X-ray diffraction
JO  - Electrochemistry communications
VL  - 71
SN  - 1388-2481
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2017-02818
SP  - 52 - 55
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000383445000012
DO  - DOI:10.1016/j.elecom.2016.08.003
UR  - https://juser.fz-juelich.de/record/829001
ER  -