Advances in Electrolyte Chemistry for Enhanced Potassium Storage of Graphite Anodes

ABSTRACT Potassium‐ion batteries (PIBs) are promising for large‐scale energy storage due to the abundance and low cost of potassium resources. The successful deployment of graphite anodes, a leading candidate owing to their suitable capacity, low working potential, and mature manufacturing, is fundamentally governed by electrolyte chemistry. This review provides a focused examination of electrolyte design strategies specifically aimed at overcoming the key challenges of graphite anodes in PIBs, including substantial volume expansion, sluggish interfacial kinetics, and unstable solid electrolyte interphase (SEI) formation. We systematically analyze the roles of potassium salts, solvents, and functional additives in organic liquid electrolytes (OLEs) in tailoring SEI composition, suppressing solvent co‐intercalation, and enhancing the cycling stability of graphite. Advances in non‐liquid systems, such as solid‐state electrolytes (SSEs) and quasi‐solid‐state electrolytes (QSSEs), are also discussed in the context of their potential to improve safety and interfacial compatibility with graphite. Furthermore, we delve into the underlying mechanisms linking electrolyte solvation structure, interfacial chemistry, and the electrochemical behavior of graphite anodes, with particular attention to low‐temperature performance. Finally, we outline existing challenges and propose future research directions to guide the rational design of next‐generation electrolytes for high‐performance, graphite‐based PIBs.