Addressing these challenges requires a combination of materials design, synthesis techniques, and understanding of the fundamental mechanisms governing ion transport in crystalline materials. Strategies such as doping, nanostructuring, and interface engineering can be employed to enhance the ion mobility and improve the performance of crystalline materials in batteries. Still, it should be noted that typically the properties within the crystalline parts of a macroscopic material represent a lower bound for the ion mobility. Hence a material which already has a low ion mobility as a single crystal should be disregarded as a promising material with respect to its migration properties. Figure : Schematic illustration of the relevant scales and configurations explored within a battery material. The method utilized to calculate ion transport properties in the respective length scales are indicated by grey arrows, namely Density Functional Theory (DFT) and Molecular Dynamics (MD) simulations. The experimental techniques employed to directly probe ion transport are also aligned with their corresponding length scales. The figure illustrates the diverse range of scales, from atomic to mesoscale, and the corresponding configurations occurring in a battery. Investigating battery materials in such a way will lead to improve performance characteristics for future battery generation.