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Understanding the nature of the passivation layer enabling reversible calcium plating
Sustainable energy conversion & storage systems

Understanding the nature of the passivation layer enabling reversible calcium plating



13 October 2020

Juan Forero-Saboya, Carine Davoisne, Rémi Dedryvère, Ibraheem Yousef, Pieremanuele Canepa * and  Alexandre Ponrouch *. 
Energy Environ. Sci., 2020, Advance Article. 

DOI: 10.1039/D0EE02347G

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.

Understanding the nature of the passivation layer enabling reversible calcium plating

 
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