Effect of secondary phase on thermal behaviour and solid-state ion conduction in lithium doped N-ethyl-N-methylpyrrolidinium tetrafluoroborate organic ionic plastic crystal
Effect of secondary phase on thermal behaviour and solid-state ion conduction in lithium doped N-ethyl-N-methylpyrrolidinium tetrafluoroborate organic ionic plastic crystal
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第二相对锂掺杂N-乙基-N-甲基吡咯烷鎓四氟硼酸盐有机离子塑料晶体热行为和固态离子传导的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Howlett
中科院分区：
文献类型：
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作者：
N. Iranipour;Daniel Gunzelmann;A. Seeber;J. Vongsvivut;A. Hollenkamp;M. Forsyth;P. Howlett
本文研究了有机离子塑料晶体N-乙基-N-甲基吡咯烷四氟硼酸盐[C2mpyr][BF_4]的平衡相行为和锂盐（四氟硼酸锂）的影响。除了纯OIPC的平衡相变之外，在添加锂盐（10摩尔%和20摩尔% LiBF 4）之后观察到新的转变，这显著改变了材料的离子传导行为。衰减全反射（ATR）FTIR光谱结果表明，随着锂盐含量的增加，锂离子与OIPC基体之间的分子相互作用增强。变温X-射线衍射图揭示了在低温结构中以及在它们在加热扫描中的转变过程中，在含锂离子的OIPC的微观结构内存在第二相和三元相。宽谱线NMR数据与XRD和DSC观察结果一致，表明环境中锂盐含量的增加对每种离子组分（C2mpyr+、BF 4 −和Li+）的动力学变化有影响。
An investigation of the equilibrium phase behaviour and the effect of lithium salt (lithium tetrafluoroborate) on the organic ionic plastic crystal (OIPC), N-ethyl-N-methylpyrrolidinium tetrafluoroborate [C2mpyr][BF4] is described. In addition to the equilibrium phase transformations of the pure OIPC, new transitions were observed after the addition of the lithium salt (10 mol% and 20 mol% LiBF4), which significantly altered the ion conduction behaviour of the material. Attenuated total reflectance (ATR) FTIR spectroscopic results indicated that the molecular interactions between the lithium ion and the OIPC matrix were intensified with increasing lithium salt content. Variable temperature X-ray diffractograms revealed the existence of secondary and ternary phases within the microstructure of lithium ion containing OIPCs in the low temperature structures and during their transformations across the heating scans. Wide-line NMR data were consistent with the results obtained from XRD and DSC observations, indicating environments with varying dynamics for each of the ionic components (C2mpyr+, BF4− and Li+) by increased lithium salt content.