Electrochemical potassium storage explores the principles, materials, and technological developments of a variety of battery technologies based on electrochemical potassium storage. It covers the principles of potassium-ion batteries (organic and aqueous electrolytes), potassium metal batteries, potassium-sulfur (selenium) batteries, and potassium-oxygen batteries, as well as the development of the electrode materials of these batteries and the understanding of electrochemical cell operations. Batteries using potassium ions as the charge carrier to store energy operate via different electrochemical processes and have different features of materials electrochemistry compared to lithium-based batteries. Thus, battery technologies based on electrochemical potassium storage exhibit different performance strengths, potentially having diverse market applications. This is particularly important for the search for environmentally and economically sustainable alternatives to conventional lithium-ion batteries in a wide range of applications. This book presents the state-of-the-art development of potassium-based batteries and in-depth discussion on their structure-to-performance relationships. – Addresses the urgent need to develop sustainable energy storage technologies beyond lithium- Describes the fundamental principles of a variety of potassium-based battery chemistries- Analyzes the structure-to-performance relationship of various potassium-based battery materials- Provides insights into the structural designs of materials and electrodes for potassium-based batteries