1 Introduction Solid-state batteries are emerging as an alternative to conventional liquid-electrolyte batteries, but are not immune to the volume changes associated with cell failure and capacity fading that are present in both those types of cells.[1-3] In fact, the impact on performance is more severe for solid-state cells.[1, 4] Lithium-ion battery electrodes expand and contract during charge and discharge, in some cases leading to cracking of the active material particles, reducing...