In situ formation of a Li ₃ N-rich interface between lithium and argyrodite solid electrolyte enabled by nitrogen doping

N-doped lithium argyrodites exhibit a remarkable critical current density of 1.52 mA cm ⁻² . The Li ₃ N-containing SEI layer between Li and N-doped electrolyte helps solid-state batteries demonstrate prominent cycling stability and rate performance.