In the first part of this talk we describe a scheme to visualize Li deposition in the confined space inside carbon nanotubules (CNTs) to mimic Li deposition dynamics inside solid electrolyte (SE) cracks, where the high-strength CNT walls mimic the mechanically strong SEs. We observed that the deposited Li propagates as a creeping solid in the CNTs, presenting an effective pathway for stress relaxation. When the stress-relaxation pathway is blocked, Li deposition-induced stress reaches GPa level and causes CNT fracture. Mechanics analysis suggests that interfacial lithiophilicity critically governs Li deposition dynamics and stress relaxation.  In the second part of this talk we describe a meso-scale SSB inside a FIB-SEM for in-situ observation of of Li-deposition-induced cracking of SEs at the nm scale.  We show that metallic Li propagate predominantly through grains, rather than around them.  Cracks appear to nucleate within single-crystal grains beneath the electrode surface.  The cracks propagate to the surface creating bowl-shaped cracks.  Li deposition follows the pathways created by the cracks.