Battery technology is constantly changing, and the concepts and applications of these changes are rapidly becoming increasingly more important as more and more industries and individuals continue to make “greener� choices in their energy sources.  As global dependence on fossil fuels slowly wanes, there is a heavier and heavier importance placed on cleaner power sources and methods for storing and transporting that power.  Battery technology is a huge part of this global energy revolution. Potassium-ion batteries were first introduced to the world for energy storage in 2004, over two decades after the invention of lithium-ion batteries.  Potassium-ion (or “K-ion�) batteries have many advantages, including low cost, long cycle life, high energy density, safety, and reliability. Potassium-ion batteries are the potential alternative to lithium-ion batteries, fueling a new direction of energy storage research in many applications and across industries. Potassium-ion Batteries: Materials and Applications explores the concepts, mechanisms, and applications of the next-generation energy technology of potassium-ion batteries. Also included is an in-depth overview of energy storage materials and electrolytes. This is the first book on this technology and serves as a reference guide for electrochemists, chemical engineers, students, research scholars, faculty, and R&D professionals who are working in electrochemistry, solid-state science, material science, ionics, power sources, and renewable energy storage fields.