Highly Safe Ionic Liquid Electrolytes for Sodium-Ion Battery: Wide Electrochemical Window and Good Thermal Stability

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• 作者：Feng Wu ; Na Zhu ; Ying Bai ; Libin Liu ; Hang Zhou ; Chuan Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：8
• 期：33
• 页码：21381-21386
• 全文大小：434K
• 年卷期：0
• ISSN：1944-8252

文摘

Novel ionic liquid (IL) electrolytes are prepared by mixing 1-ethyl-3-methylimidazolium-bis-tetrafluoroborate (EMIBF<sub>4sub>) with different concentrations of sodium salt (NaBF<sub>4sub>). The as-prepared IL electrolytes display wide electrochemical windows of ∼4 V (1–5 V), which are consistent with the quantum chemical theoretical calculation. The IL electrolyte with 0.1 M NaBF<sub>4sub> shows excellent ionic conductivity, namely, 9.833 × 10<sup>–3sup> S cm<sup>–1sup> at 20 °C. In addition, nonflammability and good thermal stability are exhibited by combustion test and thermogravimetric analysis (TGA), which indicate the high safety of the IL electrolyte.