Vogl T, Menne S, Balducci A
Institute of Physical Chemistry & MEET Battery Research Center University of Muenster Corrensstr. 28/30, 48149 Muenster, Germany.
Phys Chem Chem Phys. 2014 Dec 7;16(45):25014-23. doi: 10.1039/c4cp03830d.
In this study we investigated the chemical-physical properties of mixtures containing the protic ionic liquid (PIL) N-butyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYRH4TFSI), propylene carbonate (PC) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in view of their use as electrolytes for lithium-ion batteries (LIBs). We showed that these electrolytic solutions might display conductivity and viscosity comparable to those of conventional electrolytes. Depending on the amount of PIL present inside the mixtures, such mixtures might also display the ability to suppress the anodic dissolution of Al. Furthermore, we showed that the coordination of lithium ions by TFSI in PIL-PC mixtures appears to be different than the one observed for mixtures of PC and aprotic ionic liquids (AILs). When used in combination with a battery electrode, e.g. lithium iron phosphate (LFP), these mixtures allow the achievement of high performance also at a very high C-rate.
在本研究中，我们研究了含有质子离子液体（PIL）N-丁基-吡咯烷鎓双（三氟甲磺酰）亚胺（PYRH4TFSI）、碳酸丙烯酯（PC）和双（三氟甲磺酰）亚胺锂（LiTFSI）的混合物的化学物理性质，以期将其用作锂离子电池（LIB）的电解质。我们表明，这些电解液的电导率和粘度可能与传统电解液相当。根据混合物中PIL的含量，此类混合物还可能具有抑制Al阳极溶解的能力。此外，我们表明，TFSI在PIL-PC混合物中对锂离子的配位作用似乎与在PC和非质子离子液体（AIL）混合物中观察到的不同。当与电池电极（如磷酸铁锂（LFP））结合使用时，这些混合物在非常高的C倍率下也能实现高性能。
