TY  - JOUR
AU  - Wagner, Ralf
AU  - Korth, Martin
AU  - Streipert, Benjamin
AU  - Kasnatscheew, Johannes
AU  - Gallus, Dennis R.
AU  - Brox, Sebastian
AU  - Amereller, Marius
AU  - Cekic-Laskovic, Isidora
AU  - Winter, Martin
TI  - Impact of Selected LiPF $_{6}$ Hydrolysis Products on the High Voltage Stability of Lithium-Ion Battery Cells
JO  - ACS applied materials & interfaces
VL  - 8
IS  - 45
SN  - 1944-8252
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2017-02803
SP  - 30871 - 30878
PY  - 2016
AB  - Diverse LiPF6 hydrolysis products evolve during lithium-ion battery cell operation at elevated operation temperatures and high operation voltages. However, their impact on the formation and stability of the electrode/electrolyte interfaces is not yet investigated and understood. In this work, literature-known hydrolysis products of LiPF6 dimethyl fluorophosphate (DMFP) and diethyl fluorophosphate (DEFP) were synthesized and characterized. The use of DMFP and DEFP as electrolyte additive in 1 M LiPF6 in EC:EMC (1:1, by wt) was investigated in LiNi1/3Mn1/3Co1/3O2/Li half cells. When charged to a cutoff potential of 4.6 V vs Li/Li+, the additive containing cells showed improved cycling stability, increased Coulombic efficiencies, and prolonged shelf life. Furthermore, low amounts (1 wt % in this study) of the aforementioned additives did not show any negative effect on the cycling stability of graphite/Li half cells. DMFP and DEFP are susceptible to oxidation and contribute to the formation of an effective cathode/electrolyte interphase as confirmed by means of electrochemical stability window determination, and X-ray photoelectron spectroscopy characterization of pristine and cycled electrodes, and they are supported by computational calculations.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000388429600024
DO  - DOI:10.1021/acsami.6b09164
UR  - https://juser.fz-juelich.de/record/828986
ER  -