Review—Recent Advances in Understanding Potassium Metal Anodes

In the recent years, together with sodium, potassium-based batteries are raising a considerable attention as a possible alternative for replacing lithium batteries. This concise review gives an insight in the particularities of the interphases (solid electrolyte interphase) and interfaces (dendrite growth) in battery cells where potassium metal is in contact with liquid electrolytes, based on available theories and very recent experimental evidence. In addition, the electrochemical background of issues occurring in solid-state batteries with K metal anodes are touched upon.