In Situ Diffusion Measurements of a NASICON-Structured All-Solid-State Battery Using Muon Spin Relaxation

In situ muon spin relaxation is demonstrated as an emerging technique that can provide a volume-averaged local probe of the ionic diffusion processes occurring within electrochemical energy storage devices function state charge. Herein, we present work on conceptually interesting NASICON-type all-solid-state battery LiM2(PO4)3, using M = Ti in cathode, Zr electrolyte, and Li metal anode. The pristine materials are studied individually found to possess low hopping activation energies ∼50−60 meV competitive Li+ self-diffusion coefficients ∼10–10–10–9 cm2 s–1 at 336 K. Lattice matching cathode electrolyte crystal structures employed for enhance between components attempt minimize interfacial resistance. cell examined by relaxation, providing first example such measurements. This presents opportunity community observe intrinsic dynamics behavior simultaneously nondestructive manner.