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Scientific article
English

A mixed anion hydroborate/carba-hydroborate as a room temperature Na-ion solid electrolyte

Published inJournal of Power Sources, vol. 404, p. 7-12
Publication date2018
Abstract

The novel compound Na2-x(CB11H12)x(B12H12)1-x shows a fast ionic Na conductivity of 2 mS cm−1 at room temperature, reaching the superionic regime above 333 K. A low activation energy of 314 meV, in a thermodynamically and electrochemically stable structure, suggest its usage as a potential solid electrolyte in future allsolid Na-ion batteries. Density functional theory simulations indicate the heterovalent anionic mixing to be the responsible in stabilizing a bcc structure, which allows a facile Na+ diffusion already at room temperature. Cyclic voltammetry measurement with a tailored setup for solid-state electrolytes reveals a wide operating window (up to 4.1 V vs. Na+/Na). The symmetrical cell featuring NaeSn alloy-based electrodes shows reversible Na+ shuttling with limited polarization after more than 700 operating hours.

Keywords
  • Solid electrolyte
  • Na-ion battery
  • Structural disorder
  • Na-ion conductivity
  • Solid state cyclic voltammetry
  • Closo-hydroborate carba-hydroborate mix
Research group
Funding
Citation (ISO format)
BRIGHI, Matteo et al. A mixed anion hydroborate/carba-hydroborate as a room temperature Na-ion solid electrolyte. In: Journal of Power Sources, 2018, vol. 404, p. 7–12. doi: 10.1016/j.jpowsour.2018.09.085
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ISSN of the journal0378-7753
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Creation12/05/2018 5:51:00 PM
First validation12/05/2018 5:51:00 PM
Update time03/15/2023 3:12:48 PM
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