Data underlying paper: Elucidation of Enhanced Lithium Conductivity in Nanoporous Ionogel Using Solid State NMR

Data supporting findings of paper https://doi.org/10.1002/admi.202201646<br>AbstractNanostructured solid composite electrolyte or nano-SCE, which is composed of an ionic liquid, nanoporous silica, and residuals of immobilized precursor components, shows promising synergistic properties. The ionic conductivity of nano-SCE is in the range of 2–5 mS cm⁻¹, which exceeds the bulk ionic liquid conductivity at ambient temperature, while maintaining characteristics of a solid electrolyte such as having no leakage issues as the ionic liquid is confined, and lower flammability compared to conventional liquid electrolytes. In this study, the underlying mechanism of enhanced conductivity is investigated by using magic angle spinning NMR and NMR relaxometry analysis. Water, one of the volatile precursor molecules has shown to play a key role in the final conductivity and stability at the solid-electrolyte interface, as it enhances the temperature range in which the ionic liquid remains mobile. In line with previous studies, water with lowered mobility is found in the silicon matrix. The activation energies of lithium ion transfer probed by NMR relaxometry, however, do not change as function of water content. The increase in bulk mobility of lithium ions under ambient conditions compared to water-less nano-SCE is found to be the origin of the altered conductivity of this material.

本数据集支撑论文https://doi.org/10.1002/admi.202201646的研究发现。
纳米结构固体复合电解质（nanostructured solid composite electrolyte, 简称nano-SCE）由离子液体、纳米多孔二氧化硅以及固定化前驱体组分残留物构成，展现出优异的协同性能。该材料的离子电导率处于2–5 mS cm⁻¹区间，高于室温下本体离子液体的离子电导率；同时兼具固体电解质的特性：因离子液体被限域而无泄漏问题，且相较于传统液态电解质具有更低的可燃性。
本研究通过魔角旋转核磁共振（magic angle spinning NMR）与核磁共振弛豫分析，探究了电导率提升的内在机制。挥发性前驱体分子之一的水，在最终电导率与固-电解质界面稳定性中发挥关键作用，因其拓宽了离子液体保持流动性的温度区间。与既往研究一致，低迁移率的水被发现存在于硅基基质中。不过，通过核磁共振弛豫分析测得的锂离子转移活化能，并未随水含量发生变化。相较于不含水的nano-SCE，室温条件下锂离子本体迁移率的提升，被认为是该材料电导率改变的根源。