Advances in high entropy doping of Li7La3Zr2O12 (LLZO) garnet solid electrolyte: Properties and feasibility analysis

It is discovered that solid electrolytes have a lower ionic conductivity than liquid electrolytes. Such situations have drawn significant attention in the scientific fields, and various practical solutions have been devised to address them. Doping is frequently employed to increase ionic conductivity to address the intrinsic flaws in solid electrolytes. Most recently, introducing a high-entropy appliance to the doping in the Li7La3Zr2O12(LLZO) garnet structure was considered to be a novel method for the performance enhancement of solid electrolytes. This paper reviewed the state-of-the-art research in the field of high-entropy solid electrolytes. The basic structure of LLZO and migration ways of Li-ions were discussed in detail. The latest approaches involving the use of high-entropy doping were introduced. In addition, the working mechanisms of the high-entropy appliance to improve the ionic conductivity were discussed. Special attention was paid to the practical high-entropy doping system. The effects of structure distortion on the ionic conductive properties such as the site energy overlapping were assessed. Finally, the outlook of the development of high-entropy doping systems was discussed. It can be concluded that all future problems related to atomic and ion diffusion can be started from this result and discussed in the next step.