Dear Colleagues,

While Li ion batteries are currently considered as the most promising technology for electric vehicle propulsion, the development of alternative and complementary battery chemistries and technologies is of great importance, especially aiming at large-scale applications, e.g., for stabilizing the power grid, where the cost (in €/kWh) and sustainability are crucial indicators. Indeed, the implementation of Li based technologies on a large scale are increasingly questioned, since the controversial debates on lithium, cobalt, and nickel availability and moreover the cost cannot be ignored. Presently there is a growing interest on Post-Lithium (Sodium, Magnesium, etc.) and All-Solid-State battery technologies. But there are several challenges to be overcome before Post-Lithium and Solid-State battery technologies become viable for large scale solutions, such as high energy and power density, increased lifetime and safety, etc. Physio-chemical and mechanical properties of electrolyte or electrode materials and their interfaces/Interphases are the key parameters for the optimization of battery performance in these technologies. The efficient transport of ions and/or electrons in electrolyte and electrode materials is necessary for obtaining high power density. The characteristics of the interphases and understanding their properties, specifically the composition, distribution, and electronic and ionic properties of the cathode/electrolyte and anode /electrolyte interfaces are the key to fabricate a stable interface. In addition, a full-scale characterization methods are necessary to explore, diagnose, and understand the cell operations under static and dynamic conditions. Complete understanding of electrode and electrolyte materials and their interfaces is essential to make a practical high-energy density post-lithium and solid-state battery technologies. This special issue will collect the most recent developments and emerging trends in the field of Post-Lithium and Solid-State battery technologies.

Dr. Vinayan Bhaghavathi Parambath
Guest Editor

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• Post-Lithium ion battery  (Sodium, Magnesium, Calcium, Potassium, Aluminum, Zinc etc.)
• Metal-Sulfur battery
• Solid-electrolytes
• Electrode/electrolyte interfaces 
• Advanced characterization techniques for batteries