This research and reference text will provide comprehensive coverage of the fundamentals of electrochemical capacitors, including metal properties, the mechanisms of different types of capacitor and their function at low-temperatures and under flexible conditions. The current research status and future challenges will also be discussed, filling a gap for an authoritative and comprehensive reference to the field. There will be a particular focus on the electrode materials and electrolytes used in electrochemical capacitors since they are two key factors that influence their performance. The book will discuss the structural design of electrode materials and the latest research in the development of electrode materials and electrolytes, including carbon materials, battery anodes, battery cathodes, aqueous electrolytes and organic electrolytes. The text will be an essential reference for researchers working on electrochemical capacitors, particularly those who are new to the field. The contents and chapters are clearly structured, which will enhance the value of the book