Degradation and recyclability. In addition to scalability, another important aspect to take into account in the near future is the end-of-life and recyclability of organic electrodes for the development of sustainable and greener batteries in a circular economy. In this direction, some naturally occurring and biodegradable organic electrode materials have been reported. A more recent example is based on metalfree polypeptide-based batteries, in which redox-active groups such as viologens and nitroxide radicals were incorporated along polypeptide backbones to be used as anode and cathode materials, respectively. The most important feature of such polypeptide-based battery is its high stability during battery operation and on-demand degradation in acidic conditions. The recycling of some organic electrodes has also been recently proposed by using a simple extraction method without decomposition of the material and with high yields. As for COFs, although the biodegradability of some of them has been studied for other applications, 118,119 future studies on the degradation and recycling of COF electrodes should be systematically carried out.