Ionic liquid based electrolytes for sodium-ion batteries: Na+ solvation and ionic conductivity
Ionic liquid based electrolytes for sodium-ion batteries: Na+ solvation and ionic conductivity
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DOI：
10.1016/j.jpowsour.2013.06.153
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发表时间：
2014-01-01
影响因子：
9.2
通讯作者：
Johansson, Patrik
中科院分区：
文献类型：
--
作者：
Monti, Damien;Jonsson, Erlendur;Johansson, Patrik
采用介电谱、差示扫描量热法、密度法、粘度法和拉曼光谱等多种表征技术对咪唑鎓-TFSI离子液体（EMIm-TFSI和BMIm-TFSI）与相应钠盐（NaTFSI）混合制备的离子液体（IL）基钠离子（Na+）电池电解质进行了研究。钠离子传导电解质表现出优异的离子电导率，在室温下高达5.5mS cm（-1），以及-86 ° C至150 ° C的有用的热窗口。更详细地，由Na+-TFSI络合物的DFT计算支持的拉曼数据分析允许我们确定钠离子溶剂化和电荷载流子性质作为盐浓度的函数。将结果与相应Li系统的数据进行比较，虽然此类电解质基本上形成[Li（TFSI）（2）]（-）作为主要Li+载体，但钠系统似乎主要形成[Na（TFSI）（3）]（2-）络合物。讨论了对电导率和粘度的影响以及钠离子电池实施的后果。(C)2013爱思唯尔有限公司版权所有。
Ionic liquid (IL) based sodium-ion (Na+) battery electrolytes obtained by mixing imidazolium-TFSI ILs (EMIm-TFSI and BMIm-TFSI) with the corresponding sodium salt (NaTFSI) have been investigated using a wide range of characterization techniques: dielectric spectroscopy, differential scanning calorimetry, densitometry, viscometry, and Raman spectroscopy. The sodium ion conducting electrolytes exhibit excellent ionic conductivities, up to 5.5 mS cm(-1) at room temperature, and a useful thermal window of -86 degrees C to 150 degrees C. In more detail, Raman data analysis supported by DFT calculations on Na+-TFSI complexes, allow us to determine the sodium ion solvation and charge carrier nature as a function of salt concentration. The results are compared to data for the corresponding Li systems and while such electrolytes essentially form [Li(TFSI)(2)](-) as the main Li+ carrier, the sodium systems seem to dominantly form [Na(TFSI)(3)](2-) complexes. The effects on conductivity and viscosity and the consequences for sodium-ion battery implementation are discussed. (C) 2013 Elsevier B.V. All rights reserved.