context: A sodium-based analog of 3a, i.e. sodium rhodizonate 3b, was tested by Goodenough et al. with an anode based on a liquid sodium–potassium alloy (NaK). The advantage of this anode is its dendrite-free nature, making it safer compared to pristine potassium. In a DME-based KFSI solution, Qm was ∼120 mA h g−1 at 125 mA g−1, with ∼50 mA h g−1 delivered at 1.25 A g−1. The capacity retention was ca. 75% after 100 cycles.