Sulfur and Wavy‐Stacking Boosted Superior Lithium Storage in 2D Covalent Organic Frameworks

• DOI: 10.1002/smll.202405974
• Publication Date: 2024-08-16T04:09:01Z
• Authors: Nana Li; Jinhui Zhu; Chongqing Yang; Senhe Huang; Kaiyue Jiang; Qi Zheng; Yilong Yang; Haiyan Mao; Sheng Han; Lei Zhu; Xiaodong Zhuang
• Keywords: Covalent organic framework

2D conjugated covalent organic frameworks (c-COFs) provide an attractive foundation as electrodes in energy storage devices, but their capability is long hindered by limited ion accessibility within densely π-π stacked interlayers. Herein, two kinds of c-COFs based on dioxin and dithiine linkages are reported, which exhibit distinct in-plane configurations-fully planar undulated layers. X-ray diffraction analysis reveals wavy square-planar networks dithiine-bridged COF (COF-S), attributed to curved C─S─C bonds the linkage, whereas dioxin-bridged (COF-O) features packed fully Theoretical experimental results elucidate that stacking COF-S possesses expanded layer distance 3.8 Å facilitates effective rapid Li