Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11020224 | Journal of Power Sources | 2018 | 6 Pages |
Abstract
The novel compound Na2-x(CB11H12)x(B12H12)1-x shows a fast ionic Na conductivity of 2â¯mSâ¯cmâ1 at room temperature, reaching the superionic regime above 333â¯K. A low activation energy of 314â¯meV, in a thermodynamically and electrochemically stable structure, suggest its usage as a potential solid electrolyte in future all-solid 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 4.1â¯V vs. Na+/Na). The symmetrical cell featuring NaSn alloy-based electrodes shows reversible Na+ shuttling with limited polarization after more than 700 operating hours.
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Authors
Matteo Brighi, Fabrizio Murgia, Zbigniew Åodziana, Pascal Schouwink, Anna WoÅczyk, Radovan Äerný,