Anisotropic MRI contrast reveals enhanced ionic transport in plastic crystals.
Anisotropic MRI contrast reveals enhanced ionic transport in plastic crystals.
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各向异性 MRI 对比揭示了塑料晶体中离子传输的增强。
DOI：
10.1021/ja508290z
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发表时间：
2014
影响因子：
15
通讯作者：
M. Forsyth
中科院分区：
文献类型：
--
作者：
K. Romanenko;Liyu Jin;L. Madsen;J. Pringle;L. O’Dell;M. Forsyth
有机离子塑料晶体（OIPC）作为固态电解质用于电化学装置，如锂离子电池和太阳能和燃料电池是有吸引力的。OIPC提供高离子传导性、不燃性和分子设计的多功能性。然而，OIPC的内在离子输运行为尚未完全了解，其测量的性质在很大程度上取决于热历史。固态磁共振成像实验揭示了一个惊人的图像对比度各向异性敏感的多晶OIPC晶界的取向。探测具有不同热历史的三乙基（甲基）膦双（氟磺酰基）酰亚胺（P1222FSI）样品表明微晶排列的巨大变化。在从熔体缓慢冷却时，微晶在整个样品中表现出优选的取向，导致使用阻抗谱探测的电导率的数量级增加。这项调查描述了一个新的概念窗口和一个新的表征方法，了解多晶畴结构和塑料晶体和其他固态导体的运输。
Organic ionic plastic crystals (OIPCs) are attractive as solid-state electrolytes for electrochemical devices such as lithium-ion batteries and solar and fuel cells. OIPCs offer high ionic conductivity, nonflammability, and versatility of molecular design. Nevertheless, intrinsic ion transport behavior of OIPCs is not fully understood, and their measured properties depend heavily on thermal history. Solid-state magnetic resonance imaging experiments reveal a striking image contrast anisotropy sensitive to the orientation of grain boundaries in polycrystalline OIPCs. Probing triethyl(methyl)phosphonium bis(fluorosulfonyl)imide (P1222FSI) samples with different thermal history demonstrates vast variations in microcrystallite alignment. Upon slow cooling from the melt, microcrystallites exhibit a preferred orientation throughout the entire sample, leading to an order of magnitude increase in conductivity as probed using impedance spectroscopy. This investigation describes both a new conceptual window and a new characterization method for understanding polycrystalline domain structure and transport in plastic crystals and other solid-state conductors.
影响因子：
2.2
作者：
Idiyatullin, Djaudat;Corum, Curt;Garwood, Michael
通讯作者：
Garwood, Michael