Multiple Accessible Redox-Active Sites in a Robust Covalent Organic Framework for High-Performance Potassium Storage

Covalent organic framework (COF) materials with porous character and robust structure have significant applied implications for K-ion battery (KIB) anodes, but they are limited by the low reversible capacity and inferior rate capability. Here, based on theoretical calculations, we identified that a porous bulk COF featuring numerous pyrazines and carbonyls in the π-conjugated periodic skeleton could provide multiple accessible redox-active sites for high-performance potassium storage. Its porous structure with a surface-dominated storage mechanism enabled the fast and stable storage of K-ions. Its insolubility in organic electrolytes and small volumetric change after potassiation ensured a robust electrode for…

• NN
  National Natural Science Foundation of China

  Awards: 22101099, 22150004, 22109052, 21731002, 21975104
• CU
  Central University Basic Research Fund of China

  Award: 11621033
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Award: 2022B1515020001