Potassium-Ion Batteries: Key to Future Large-Scale Energy Storage?

The demand for large-scale, sustainable, eco-friendly, and safe energy storage systems are ever increasing. Currently, lithium-ion battery (LIB) is being used in large scale for various applications due to its unique features. However, its feasibility and viability as a long-term solution is under question due to the dearth and uneven geographical distribution of lithium resources. It is in this context that alternative energy storage systems become significant. Potassium-ion battery (KIB) is one of the latest entrants into this arena. Researchers have demonstrated that this technology has the potential to become a competing technology to the LIBs and sodium-ion batteries (NIBs). This review summarizes the research progress achieved in this technology including electrode materials, electrolyte, and binders, etc., along with a brief discussion about the future prospects and opportunities.