Ionic Liquid-Based Electrolytes Containing Surface-Functionalized Inorganic Nanofibers for Quasisolid Lithium Batteries
Ionic Liquid-Based Electrolytes Containing Surface-Functionalized Inorganic Nanofibers for Quasisolid Lithium Batteries
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DOI：
10.1021/acsomega.6b00480
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发表时间：
2017-03
期刊：
影响因子：
4.1
通讯作者：
Takahiro Yuuki;Y. Konosu;M. Ashizawa;T. Iwahashi;Y. Ouchi;Y. Tominaga;Rie Ooyabu;H. Matsumoto;Hidetoshi Matsumoto
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文献类型：
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作者：
Takahiro Yuuki;Y. Konosu;M. Ashizawa;T. Iwahashi;Y. Ouchi;Y. Tominaga;Rie Ooyabu;H. Matsumoto;Hidetoshi Matsumoto
在本研究中，表面氨基功能化的二氧化硅纳米纤维(f-SiO2Nf，平均直径分别为400和1000 nm)被用作离子液体(IL)基准固体电解质的一维填料。在含有双(三氟甲磺酰基)锂(LiTFSA)的IL(1-乙基-3-甲基咪唑双(三氟甲磺酰基)酰胺，EMITFSA)中加入f-SiO_2Nf后，分散良好的一维纳米膜很容易在IL中形成三维网络结构，起到物理交联剂的作用，并增加了复合材料的粘度，从而在NFS3.5wt%的含量下提供了准固态。流变学测试表明，所制备的复合材料在40~150℃范围内呈现“凝胶状”特征，在室温附近表现出较高的离子电导率，约为10~(-3)S厘米~(-1)。为了考察f-SiO2NFS在复合材料中的相加作用，还估算了锂的迁移数。结果表明，稀释剂非晶玻璃提高了复合材料的迁移数。此外，含有所制备复合材料的准固态锂离子电池在高温(125℃)下表现出较高的倍率特性和良好的循环性能。
In the present study, surface amino-functionalized silica nanofibers (f-SiO2NFs, average diameter = 400 and 1000 nm) are used as one-dimensional (1-D) fillers of ionic liquid (IL)-based quasisolid electrolytes. On adding f-SiO2NFs to an IL (1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide, EMITFSA) containing lithium bis(trifluoromethanesulfonyl)-amide (LiTFSA), the well-dispersed 1-D nanofillers easily form a three-dimensional network structure in the IL, function as physical cross-linkers, and increase the viscosity of the composites, consequently providing a quasisolid state at a 3.5 wt % fraction of the NFs. Rheological measurements demonstrate that the prepared composites exhibit “gel-like” characteristics at 40–150 °C. All prepared composites show high ionic conductivities, on the order of 10–3 S cm–1, around room temperature. To investigate the additive effect of f-SiO2NFs in the composites, the lithium transference numbers are also evaluated. It is found that thinner NFs enhance the transference numbers of the composites. In addition, quasisolid lithium-ion cells containing the prepared composites demonstrate relatively high rate characteristics and good cycling performance at high temperature (125 °C).