In terms of energy density, some COFs based on n-type moieties have already demonstrated higher specific capacities than those of conventional inorganic cathodes, while high voltages can be achieved by incorporating specific p-type units into the framework. However, the design of COFs with both high capacity and high potential remains a major challenge to give rise to superior energy density. In this sense, redox-bipolar COFs have emerged as promising systems as they allow the combination of electroactive p-and n-type building blocks that can lead to high potential and high capacity at the same time.