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

Łodziana, Zbigniew
Wołczyk, Anna
Published in Journal of power sources. 2018, vol. 404, p. 7-12
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 electrolyteNa-ion batteryStructural disorderNa-ion conductivitySolid state cyclic voltammetryCloso-hydroborate carba-hydroborate mix
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Research group Groupe Cerny
Swiss National Science Foundation: 200020_172503
European Commission: ECOSTORE
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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 https://archive-ouverte.unige.ch/unige:112120

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Deposited on : 2018-12-07

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