Chemomechanics: friend or foe of the AND problem of solid-state batteries?

Solid state electrolytes are widely considered as the enabler of lithium metal anodes for safe, durable and high energy density rechargeable lithium ion batteries. Despite the promise, failure mechanisms associated with solid state batteries are not well-established, largely due to limited understanding of the chemomechanical factors governing them. We focus on the recent developments in understanding the solid state aspects including the effects of mechanical stresses, constitutive relations, fracture, void formation and outline the gaps in literature. We also provide an overview of the manufacturing and processing of solid state batteries in relation to chemomechanics. The gaps identified provides concrete directions towards the rational design and development of failure resistant solid state batteries.