Department of Chemistry, University of Central Florida , 4111 Libra Drive, Orlando, Florida 32816, United States.
Department of Chemistry and Biochemistry, University of California-Los Angeles , 607 Charles E. Young Drive East, Los Angeles, California 90095, United States.
J Am Chem Soc. 2016 Aug 10;138(31):9767-70. doi: 10.1021/jacs.6b05568. Epub 2016 Jul 28.
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 LiClO4 displayed room temperature conductivity up to 0.26 mS cm(-1) and high electrochemical stability. This outcome portends use of COFs as solid-state electrolytes in batteries.
共价有机骨架（COFs）通常结晶为不溶性粉末，人们认为其加工成合适的器件受到限制。我们证明 COFs 可以通过机械压制形成具有各向异性有序的形状物体，具有 hk0 和 00l 晶面之间的择优取向。具有不同功能和对称性的五种 COFs 表现出相似的结晶行为和显著的稳定性，表明这种加工方法具有普遍性。用 LiClO4 浸渍的大块 COF 粉末制备的颗粒显示出高达 0.26 mS cm(-1) 的室温电导率和高电化学稳定性。这一结果预示着 COFs 可作为电池中的固态电解质使用。
