TY  - JOUR
AU  - Murmann, Patrick
AU  - Mönnighoff, Xaver
AU  - von Aspern, Natascha
AU  - Janssen, Pia
AU  - Kalinovich, Nataliya
AU  - Shevchuk, Michael
AU  - Kazakova, Olesya
AU  - Röschenthaler, Gerd-Volker
AU  - Cekic-Laskovic, Isidora
AU  - Winter, Martin
TI  - Influence of the Fluorination Degree of Organophosphates on Flammability and Electrochemical Performance in Lithium Ion Batteries: Studies on Fluorinated Compounds Deriving from Triethyl Phosphate
JO  - Journal of the Electrochemical Society
VL  - 163
IS  - 5
SN  - 1945-7111
CY  - Pennington, NJ
PB  - Electrochemical Soc.
M1  - FZJ-2017-07606
SP  - A751 - A757
PY  - 2016
AB  - Three symmetric substances originating from triethyl phosphate were specifically synthesized with varying degree of fluorination at the side chain. Different concentrations of each phosphate were evaluated as co-solvent with regard to their flammability and the electrochemical cycling performance. With higher degree of fluorination and a higher amount of the phosphate in the electrolyte, the self-extinguishing time (SET), a value to determine and compare the flammability of electrolytes, could be significantly lowered to yield a non-flammable electrolyte mixture. A specifically designed SET device is introduced, which offers more accurate results due to lowered standard deviations by minimizing random and systematic errors. As the application of phosphates as co-solvents results in a trade-off in cycling performance, a thorough determination in regard to the ionic conductivity, the anodic oxidation stability and the compatibility with anode and cathode material was carried out in half- and full-cells. The manuscript strives to establish a deeper understanding of the influence that the utilization of phosphates as co-solvents entail with special focus on the fluorination degree. It could be shown that the partially fluorinated phosphate offers the best cycling results and therefore the lowest trade-off in performance, while a severe improvement in SET could be achieved compared to the reference electrolyte.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000370866700023
DO  - DOI:10.1149/2.1031605jes
UR  - https://juser.fz-juelich.de/record/840040
ER  -