Prussian blue analogues in sodium-ion batteries: comparison with lithium technologies, recent advances, and prospects

With the increasing global demand for energy storage systems, there is a growing interest in the development of new solutions for this sector. While lithium-ion technology has long dominated the battery market, significant natural resource limitations of their component materials have prompted a noticeable shift towards other battery chemistries in both science and industry. In recent years, there has been extensive research on sodium-ion batteries (SIBs) as a cheaper and more sustainable alternative. This work compiles the recent advancements in Prussian blue materials, known for offering the highest energy density in SIBs. The presentation not only covers the main properties of these materials for sodium batteries, but also delves into their chemistry and mechanisms.