TY  - JOUR
AU  - Qi, Xin
AU  - Tao, Liang
AU  - Hahn, Hendrik
AU  - Schultz, Carola
AU  - Gallus, Dennis Roman
AU  - Cao, Xia
AU  - Nowak, Sascha
AU  - Röser, Stephan
AU  - Li, Jie
AU  - Cekic-Laskovic, Isidora
AU  - Rezaei Rad, Babak
AU  - Winter, Martin
TI  - Lifetime limit of tris(trimethylsilyl) phosphite as electrolyte additive for high voltage lithium ion batteries
JO  - RSC Advances
VL  - 6
IS  - 44
SN  - 2046-2069
CY  - London
PB  - RSC Publishing
M1  - FZJ-2017-02824
SP  - 38342 - 38349
PY  - 2016
AB  - The tris(trimethylsilyl) phosphite (TMSPi) is considered as an ideal electrolyte additive for lithium ion batteries. In this work, its positive effect as well as its failure mechanism in a LiPF6 containing electrolyte was studied by means of selected electrochemical, structural and analytical techniques. The LiNi0.5Co0.2Mn0.3O2/graphite cells with TMSPi as electrolyte additive were cycled between 2.8 and 4.6 V. Thanks to the compact cathode electrolyte interphase formed by the oxidative decomposition of TMSPi in a freshly prepared TMSPi containing electrolyte, both the discharge capacity and the cycling stability of cells were enhanced. However, our results also show that TMSPi actually reacts with LiPF6 at room temperature. TMSPi is consumed by this spontaneous reaction after aging for certain time. In addition, a part of the fluorophosphates, generated from the hydrolysis of LiPF6, is bonded to one or two TMS groups, causing a decrease in the fluorophosphate content in the CEI film. Consequently, the cycling stability of the lithium ion cells with aged TMSPi containing electrolyte deteriorates. The obtained results offer important insights into the practical application of TMSPi, which means that TMSPi can only be used as an effective additive in a freshly prepared LiPF6 containing electrolyte.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000374495400106
DO  - DOI:10.1039/C6RA06555D
UR  - https://juser.fz-juelich.de/record/829007
ER  -