Lithium doped N-methyl-N-ethylpyrrolidinium bis(trifluoromethanesulfonyl)amide fast-ion conducting plastic crystals

Phase Behavior of the [N(C₂H₅)₄][BF₄]-[N(C₃H₇)₄][BF₄] Binary System

“…3,12,[15][16][17] During considerable efforts to increase the ionic conductivity of OIPCs, the method of doping of the salts of target ions into OIPCs has been adopted since it was reported to significantly increase the ionic conductivity up to several orders of magnitude. 5,7,9,[18][19][20][21][22][23] Among these materials, [N-ethyl-N-methylpyrrolidinium][N(SO 2 -CF 3 ) 2 ] was one of the OIPCs to exhibit high ionic conductivity, and doping with Li[N(SO 2 CF 3 ) 2 ] salt to this OIPC was found to result in enhancement in ionic conductivity by twenty times and was very attractive for lithium secondary battery application. 5,19,20 Addition of an inorganic salt to OIPCs has been mainly carried out to introduce mobile ions such as Li + to achieve good ion conduction, whereas mixing two OIPCs is also considered as a method to obtain high ionic conductivity, which typically focuses on the change of their structural and thermal properties.…”

“…5,7,9,[18][19][20][21][22][23] Among these materials, [N-ethyl-N-methylpyrrolidinium][N(SO 2 -CF 3 ) 2 ] was one of the OIPCs to exhibit high ionic conductivity, and doping with Li[N(SO 2 CF 3 ) 2 ] salt to this OIPC was found to result in enhancement in ionic conductivity by twenty times and was very attractive for lithium secondary battery application. 5,19,20 Addition of an inorganic salt to OIPCs has been mainly carried out to introduce mobile ions such as Li + to achieve good ion conduction, whereas mixing two OIPCs is also considered as a method to obtain high ionic conductivity, which typically focuses on the change of their structural and thermal properties. 24 Alkylammonium salts have been attracting attention in structural studies because they exhibit a variety of structural changes during thermal transitions and their highest temperature solid phase is often characterized as IPC phase.…”

Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

“…The iodide salts, for example, are usually solid at room temperature, exhibit fewer phase transitions, and have a higher melting point, compared to salts based on anions with a more delocalized charge such as PF 6 creases as the length of the alkyl group increases, up to a certain length ͑which is dependent on the choice of anion͒. 1,[11][12][13][14][15][16][17] One method for determining the nature of molecular motion in these systems is nuclear magnetic resonance ͑NMR͒ second moment analysis. In order for this analysis to be accurately performed a crystal structure of the compound is desirable, where inter-and intra-molecular distances are known precisely.…”

A novel organosilicon-based ionic plastic crystal as solid-state electrolyte for lithium-ion batteries

“…However, the entropy of melting can be higher for OIPCs because one of its ion species may exhibit rotational motions (Armel et al, 2011). The decreased entropy of LiODFB/[DTMA] [TFSI] suggests that LiODFB might affect the crystallinity of the plastic crystal, probably owing to the formation of solid solutions as observed in LiTFSI-pyrrolidinium family (Forsyth et al, 2000). IPC5 exhibits a similar phase transition entropy as IPC3, having the same doping level of 20%.…”