Fig. 3.

Density, electrical and mechanical properties of the EMm and EM/LMm. a The density of EMm corresponding to porosity. b Compression stress–strain curves of EMm (density: 0.054 g cm⁻³) under different strains. c The conductivity and density of EM/LMm depend on the LM content. d Compressive stress–strain curve of EM/LMm (density: 0.126 g cm⁻³) at 90% strain. e SEM images show deformation of cell structure at the compressive strain of 30% and 70%. f Schematic illustration dynamic elastic behaviors of the EM/LMm upon mechanical compression-releasing. g Mechanical–electrical properties of the EM/LMm under loading–unloading cycles