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

Coralie Forestier (1, 2, 3) , Piotr Jankowski (4) , Agnieszka Wizner (1, 2) , Carine Davoisne (1, 2) , Grégory Gachot (2, 1) , Lucas Sannier (3) , Sylvie Grugeon (1, 2) , Patrik Johansson (5) , Michel Armand (2) , Stéphane Laruelle (1, 2)

1 RS2E - Réseau sur le stockage électrochimique de l'énergie
2 LRCS - Laboratoire réactivité et chimie des solides - UMR CNRS 7314
3 Technocentre Renault [Guyancourt]
4 Warsaw University of Technology [Warsaw]
5 Chalmers University of Technology [Göteborg]

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+.

Mots clés: Li-ion battery; SEI; Additives; DFT; Vinyl ethylene carbonate; Dicyano ketene alkylene acetal

Domaines: Chimie inorganique

Coralie Forestier, Piotr Jankowski, Agnieszka Wizner, Carine Davoisne, Grégory Gachot, et al.. Comparative investigation of solid electrolyte interphases created by the electrolyte additives vinyl ethylene carbonate and dicyano ketene vinyl ethylene acetal. Journal of Power Sources, 2016, 345, pp.212 - 220. ⟨10.1016/j.jpowsour.2017.01.131⟩. ⟨hal-01473626⟩