Comparative investigation of solid electrolyte interphases created by the electrolyte additives vinyl ethylene carbonate and dicyano ketene vinyl ethylene acetal

C. Forestier; Piotr Jankowski; A Wizner; Carine Davoisne; G. Gachot; L. Sannier; S. Grugeon; Patrik Johansson; Michel Armand; S. Laruelle

doi:10.1016/j.jpowsour.2017.01.131

Comparative investigation of solid electrolyte interphases created by the electrolyte additives vinyl ethylene carbonate and dicyano ketene vinyl ethylene acetal
Journal article, 2017

The effect of the replacement of the carbonyl oxygen in VEC additive by =C(CN)(2) in the analogous dicyano ketene vinyl ethylene acetal (DCKVEA) on the electrochemical reduction profile is significant. Yet, the additives were proven, through IR spectroscopy supported by DFT computations, by applying EELS techniques and performing synthesis of a reduction product, to reduce in a similar way. Interestingly, the reduction-induced capacities were found to be quite different and can be explained either by the different properties of the SEI, from lithium carbonate and its malononitrile homologue, or by the different abilities of the two additives to solvate Li+.

Vinyl ethylene carbonate

Additives

Dicyano ketene alkylene acetal

SEI

Li-ion battery

DFT