Mechanically Shaped Two-Dimensional Covalent Organic Frameworks Reveal Crystallographic Alignment and Fast Li-Ion Conductivity

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• 作者：Demetrius A. Vazquez-Molina ; Gavin S. Mohammad-Pour ; Chain Lee ; Matthew W. Logan ; Xiangfeng Duan ; James K. Harper ; Fernando J. Uribe-Romo
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：August 10, 2016
• 年：2016
• 卷：138
• 期：31
• 页码：9767-9770
• 全文大小：307K
• 年卷期：0
• ISSN：1520-5126

文摘

Covalent organic frameworks (COFs) usually crystallize as insoluble powders, and their processing for suitable devices is thought to be limited. We demonstrate that COFs can be mechanically pressed into shaped objects having anisotropic ordering with preferred orientation between hk0 and 00l crystallographic planes. Five COFs with different functionality and symmetry exhibited similar crystallographic behavior and remarkable stability, indicating the generality of this processing. Pellets prepared from bulk COF powders impregnated with LiClO<sub>4sub> displayed room temperature conductivity up to 0.26 mS cm<sup>–1sup> and high electrochemical stability. This outcome portends use of COFs as solid-state electrolytes in batteries.