Facile reduction of pseudo-carbonates: Promoting solid electrolyte interphases with dicyanoketene alkylene acetals in lithium-ion batteries
Journal article, 2016
Dicyanoketene ethylene and propylene acetals, DCKEA and DCKPA respectively, have been investigated as electrolyte additives for Li-ion batteries. The purpose was to assess the changes in reduction behaviour and solid electrolyte interphase (SEI) passivation properties upon replacing the carbonyl group of ethylene carbonate (EC) and propylene carbonate (PC) solvents, respectively, by the slightly more electronegative and highly conjugated =C(CN)(2) group. The experimental reduction potentials and the IR spectroscopy characterisation efforts were further supported by density functional theory (DFT) computations. The two additives were found to, in relatively small amount (0.5 wt%), provide beneficial effects on the capacity retention of 8 mAh cells cycled at 20 and 45 degrees C. Moreover, the additives proved to enhance the thermal stability of the lithiated graphite/electrolyte interface, as deduced from DSC measurements.
cells
graphite anode
Thermal runaway
fluoroethylene
DFT
Additives
low-temperature performance
Dicyanoketene alkylene acetal
carbonate
additives
thermal-stability
vinyl ethylene carbonate
li-ion
density functionals
SEI
elevated-temperature
Li-ion battery
Author
C. Forestier
Centre national de la recherche scientifique (CNRS)
University of Picardie Jules Verne
Renault
Institut National de l'Environnement Industriel et des Risques (INERIS)
Piotr Jankowski
Warsaw University of Technology
Chalmers, Physics, Condensed Matter Physics
L. Coser
University of Picardie Jules Verne
Centre national de la recherche scientifique (CNRS)
G. Gachot
Centre national de la recherche scientifique (CNRS)
University of Picardie Jules Verne
L. Sannier
Renault
Patrik Johansson
Chalmers, Physics, Condensed Matter Physics
M. Armand
University of Picardie Jules Verne
S. Grugeon
Centre national de la recherche scientifique (CNRS)
University of Picardie Jules Verne
S. Laruelle
University of Picardie Jules Verne
Centre national de la recherche scientifique (CNRS)
Journal of Power Sources
0378-7753 (ISSN)
Vol. 303 1-9Areas of Advance
Transport
Energy
Materials Science
Subject Categories
Condensed Matter Physics
DOI
10.1016/j.jpowsour.2015.10.103