Understanding the short circuit in solid-state batteries
Summary
Max Planck researchers explain how dendrites form in solid-state batteries during charging and penetrate the ceramic electrolyte, causing short circuits. Using cryogenic vacuum tests and micromechanical modeling, they show hydrostatic stress in lithium dendrites drives brittle fracture of the solid electrolyte, and discuss strategies to prevent cracking, such as tougher electrolytes, voids to deflect dendrites, and protective coatings.