Indonesia, July 8 -- Potassium-ion batteries could have a higher energy density than sodium-ion batteries. This is important for large-scale energy storage such as for renewable energy. In a review published in Science and Technology of Advanced Materials, researchers have surveyed the battery technologies that will be vital for a sustainable green transition. Eunho Lim and colleagues at Korea's Dongguk University discuss recent advances and challenges, and point towards the research needed to develop an alternative to lithium-ion batteries. Although lithium-ion batteries have been invaluable in the electronics revolution-powering laptops, smartphones, electronic vehicles, and much more-their expanding use faces a critical challenge. Lith...