作者:Djamila Benrabah、Daniel Baril、Jean-Yves Sanchez、Michel Armand、Gary G. Gard
DOI:10.1039/ft9938900355
日期:——
The high ionic conductivity of alkali-metal salts complexed with poly(oxyethylene)(POE) has stimulated wide research on solid polymer electrolytes. Differential scanning calorimetry (DSC), cyclic voltammetry and conductivity measurements have been used to explore the fundamental electrochemical characteristics of two new promising Li salts: Li[(CF3SO2)2N](LiTFSI) and Li[(CF3SO2)3C](LiTriTFSM). A study of the ionic conductivity of membranes containing various concentrations of lithium salts as a function of temperature reveals that, when compared with all the other salts used so far, these new compounds markedly improve the conductivities, essentially as a consequence of lower crystallinity. The voltammograms between â0.2 and 3.9 V vs. Li+/Li° show that the three anhydrous complexes POEâLiTFSI, POEâLiTriTFSM and POEâ50%LiTFSIâ50%LiTriTFSM have a wide electrochemical stability window.
碱金属盐与聚(氧乙烯)(POE)络合后具有高离子电导率,这激发了人们对固体聚合物电解质的广泛研究。差示扫描量热法(DSC)、循环伏安法和电导率测量法被用于探索两种前景广阔的新型锂盐的基本电化学特性:Li[(CF3SO2)2N](LiTFSI)和Li[(CF3SO2)3C](LiTriTFSM)。一项对含有不同浓度锂盐的膜的离子电导率随温度变化的研究表明,与迄今为止使用的所有其他盐相比,这些新化合物显著提高了电导率,这主要是由于结晶度较低。在0.2至3.9 V vs. Li+/Li°之间的伏安图显示,三种无水络合物POE-LiTFSI、POE-LiTriTFSM和POE-50%LiTFSI-50%LiTriTFSM具有较宽的电化学稳定性窗口。