Solid electrolytes are materials that conduct electricity through the movement of ions, rather than electrons. They are typically used in batteries and fuel cells, providing a medium for ions to travel between the anode and cathode. This allows for efficient energy storage and transfer, making solid electrolytes a key component in advanced energy systems. One of the main advantages of solid electrolytes is their stability and safety compared to liquid electrolytes. They reduce the risk of leakage and flammability, which are common issues in traditional lithium-ion batteries. Research into solid electrolytes, such as those involving sodium or lithium, is ongoing to improve their performance and commercial viability.