Understanding the nature of the passivation layer enabling reversible calcium plating

Juan Forero-Saboya , Carine Davoisne , Rémi Dedryvère (1) , Ibraheem Yousef , Pieremanuele Canepa (2) , Alexandre Ponrouch (3)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 NUS - National University of Singapore
3 ICMAB - Institut de Ciència de Materials de Barcelona

As for other multivalent systems, the interface between the calcium (Ca) metal anode and the electrolyte is of paramount importance for reversible plating/stripping. Here, we combined experimental and theoretical approaches to unveil the potential solid electrolyte interphase (SEI) components enabling facile Ca plating. Borates compounds, in the form of cross-linked polymers are suggested as divalent conducting component. A pre-passivation protocol with such SEI is demonstrated and allows to broaden the possibility for electrolyte formulation. We also demonstrated a 10-fold increase in Ca plating kinetics by tuning the cation solvation structure in the electrolyte limiting the degree of contact ion pair.

Domains: Chemical Sciences; Material chemistry

Juan Forero-Saboya, Carine Davoisne, Rémi Dedryvère, Ibraheem Yousef, Pieremanuele Canepa, et al.. Understanding the nature of the passivation layer enabling reversible calcium plating. Energy & Environmental Science, 2020, 13, pp.3423 - 3431. ⟨10.1039/d0ee02347g⟩. ⟨hal-03030874⟩