期刊
JOURNAL OF POWER SOURCES
卷 404, 期 -, 页码 7-12出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.09.085
关键词
Solid electrolytes; Structural disorder; Na-ion conductivity; Solid state cyclic voltammetry; Closo-hydroborate carba-hydroborate mix
资金
- Swiss National Science Foundation
- People Program (Marie Curie Actions) of the European Union's Seventh Framework Program FP7/2007-2013 under REA [607040]
- Polish National Science Center Project [2015/17/B/ST3/02478]
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 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 4.1 V vs. Na+/Na). The symmetrical cell featuring Na-Sn alloy-based electrodes shows reversible Na+ shuttling with limited polarization after more than 700 operating hours.
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