We propose to use muons to probe the diffusion processes which occur within a battery anode during cycling in an all solid-state battery. Such solid-state battery configurations present safer alternatives to current organic-based liquid electrolyte cells which are flammable and operate within a limited voltage window. However, issues remain with optimising lithium diffusion across the solid electrolyte-electrode interface in all solid-state cells. In operando muon spectorsocpy studies will provide a truly local probe of the lithrium diffusion dynamics in solid-state battery components. This represents the first study of its kind and will ultimately provide the community with a battery cell and protocol for in operando muon measurements for batteries.