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This can be achieved by developing a percolating pathway in the solid electrolyte or by increasing the mobility of the carrier ions. We demonstrate the ability of high-entropy metal cation mixes to improve ionic conductivity in a compound, which leads to less reliance on specific chemistries and enhanced synthesizability. Our work is the first to solve this problem by designing a solid electrolyte with not just one metal but with a team of affordable metals. In experiments at Berkeley Lab and UC Berkeley, the researchers demonstrated the new solid electrolyte by synthesizing and testing several lithium-ion and sodium-ion materials with multiple mixed-metals. The next step in this research is to apply the new approach to explore and discover novel solid electrolyte materials that can improve battery performance even further.