Sunny Wang1,Edward Barks1,William C. Chueh1
Stanford University1
Sunny Wang1,Edward Barks1,William C. Chueh1
Stanford University1
Current constriction phenomena pose significant challenges at the Li metal interface of solid state batteries. Typically these effects are associated with contact loss and void formation during Li metal stripping. In this work, we use current biased and pressure dependent electrochemical impedance spectroscopy measurements alongside finite element modelling to clarify the different origins of constriction impedance at the Li metal interface. We show that constriction impedance is not solely derived from void formation and ionically resistive surface layers can also generate the same response. The relation between constriction and conductivity is also emphasized; ionically resistive components can significantly increase the constriction resistance in solid state batteries even with identical contact geometries.