Exceptional Sodium-Ion Storage by an Aza-Covalent Organic Framework for High Energy and Power Density Sodium-Ion Batteries

• DOI: 10.1021/acsami.0c20915
• Publication Date: 2021-03-22T15:43:10Z
• Authors: Mohammad K. Shehab; K. Shamara Weerar...; Tony Huang; Ka Un Lao; Hani M. El-Kaderi
• Keywords: Covalent organic framework; Power density; Sodium-ion battery

Redox-active covalent organic frameworks (COFs) are a new class of material with the potential to transform electrochemical energy storage due well-defined porosity and readily accessible redox-active sites COFs. However, combining both high specific capacity density in COF-based batteries remains considerable challenge. Herein, we demonstrate exceptional performance Aza-COF rechargeable sodium-ion (SIBs). is microporous 2D COF synthesized from hexaketocyclohexane 1,2,4,5-benzenetetramine by condensation reaction, which affords phenazine-decorated channels theoretical 603 mA h g–1. The Aza-COF-based electrode exhibits an average (550 g–1), (492 W kg–1) at 0.1 C, power (1182 40 C. attributed swift surface-controlled redox processes rapid diffusion inside porous electrode. Rate capability studies showed that battery also performs well current rates: 1 C (363 5 (232 10 (161 20 (103 g–1). In addition, long-term cycling stability test revealed very good retention (87% C) Coulombic efficiencies near unity over 500 cycles.