TY  - JOUR
AU  - Wagner, Ralf
AU  - Streipert, Benjamin
AU  - Kraft, Vadim
AU  - Reyes Jiménez, Antonia
AU  - Röser, Stephan
AU  - Kasnatscheew, Johannes
AU  - Gallus, Dennis Roman
AU  - Börner, Markus
AU  - Mayer, Christoph
AU  - Arlinghaus, Heinrich Franz
AU  - Korth, Martin
AU  - Amereller, Marius
AU  - Cekic-Laskovic, Isidora
AU  - Winter, Martin
TI  - Counterintuitive Role of Magnesium Salts as Effective Electrolyte Additives for High Voltage Lithium-Ion Batteries
JO  - Advanced materials interfaces
VL  - 3
IS  - 15
SN  - 2196-7350
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2017-02820
SP  - 1600096 -
PY  - 2016
AB  - Further development of high voltage lithium-ion batteries requires electrolyte formulations stable against oxidation or measures to generate a protective cathode/electrolyte interface (CEI) film. In the frame of this work, the actually counterintuitive concept of using metal ions as electrolyte additives to stabilize the CEI has proven to be successful. The addition of 1 wt% magnesium bis(trifluoromethanesulfonyl)imide (Mg(TFSI)2) as electrolyte additive to a conventional LiPF6/organic carbonate electrolyte suppresses the oxidative decomposition of the bulk electrolyte as displayed in improved capacity retention, increased Coulombic efficiencies, and reduced self-discharge of LiNi1/3Mn1/3Co1/3O2 (NMC111)/Li half cells charged to the elevated upper cutoff potential of 4.6 V versus Li/Li+ at 20 °C. Moreover, the addition of Mg(TFSI)2 shows no adverse effect on the cycling performance of graphite anodes, as observed by good long-term cycling results of NMC111/graphite full cells. Ex situ analysis via X-ray photoelectron spectroscopy, scanning electron microscopy, time-of-flight secondary ion mass spectrometry, and electron energy loss spectroscopy of the harvested NMC111 electrodes after cycling indicate that the addition of Mg2+ ions leads to the formation of a CEI layer as a result of an increased hydrolysis reaction of the PF6 – anion.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000383782400005
DO  - DOI:10.1002/admi.201600096
UR  - https://juser.fz-juelich.de/record/829003
ER  -