Polymerized Ionic Liquids: Correlation of Ionic Conductivity with Nanoscale Morphology and Counterion Volume,ACS Macro Letters

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Polymerized Ionic Liquids: Correlation of Ionic Conductivity with Nanoscale Morphology and Counterion Volume
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-08-16 00:00:00 , DOI: 10.1021/acsmacrolett.7b00335
Ciprian Iacob ₁ , Atsushi Matsumoto ₂ , Marissa Brennan ₁ , Hongjun Liu ₃ , Stephen J Paddison ₃ , Osamu Urakawa ₂ , Tadashi Inoue ₂ , Joshua Sangoro ₃ , James Runt ₁

Affiliation

The impact of the chemical structure on ion transport, nanoscale morphology, and dynamics in polymerized imidazolium-based ionic liquids is investigated by broadband dielectric spectroscopy and X-ray scattering, complemented with atomistic molecular dynamics simulations. Anion volume is found to correlate strongly with T_g-independent ionic conductivities spanning more than 3 orders of magnitude. In addition, a systematic increase in alkyl side chain length results in about one decade decrease in T_g-independent ionic conductivity correlating with an increase in the characteristic backbone-to-backbone distances found from scattering and simulations. The quantitative comparison between ion sizes, morphology, and ionic conductivity underscores the need for polymerized ionic liquids with small counterions and short alkyl side chain length in order to obtain polymer electrolytes with higher ionic conductivity.

中文翻译：

聚合离子液体：离子电导率与纳米级形态和反离子体积的相关性

通过宽带介电光谱和 X 射线散射，辅以原子分子动力学模拟，研究了化学结构对聚合咪唑基离子液体中离子传输、纳米级形态和动力学的影响。发现阴离子体积与跨越超过 3 个数量级的与T _g无关的离子电导率密切相关。此外，烷基侧链长度的系统性增加导致T _{g降低约十年}-独立的离子电导率与散射和模拟发现的特征骨架到骨架距离的增加相关。离子尺寸、形态和离子电导率之间的定量比较强调需要具有小反离子和短烷基侧链长度的聚合离子液体，以获得具有更高离子电导率的聚合物电解质。

更新日期：2017-08-16

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