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All solid state Li-ion batteries employing metallic lithium as an anode offerhigher energy densities while also being safer than conventional liquidelectrolyte based Li-ion batteries. However, the growth of tiny filaments oflithium (dendrites) across the solid state electrolyte layer leads to prematureshorting of cells and limits their practical viability. The microscopicmechanisms that lead to lithium dendrite growth in solid state cells are stillunclear. Using garnet based lithium ion conductor as a model solid stateelectrolyte, we show that interfacial void growth during lithium dissolutionprecedes dendrite nucleation and growth. Using a simple electrostatic model, weshow that current density at the edges of the voids could be amplified by asmuch as four orders of magnitude making the cells highly susceptible todendrite growth after void formation. We propose the use of metallicinterlayers with low solubility and high nucleation overpotential for lithiumto delay void growth. These interlayers increase dendrite growth tolerance insolid state electrolytes without the undue necessity for high stack pressures.

An interlayer with low solubility for lithium enhances tolerance to dendrite growth in solid state electrolytes