For the smooth surface SEI: "Scientific schematic of a flat battery electrode surface with a uniform solid electrolyte interphase (SEI) layer. An AFM tip is scanning the surface with clear vertical and lateral motion. Clean, colorful, and technical drawing." For the rough surface SEI: "Scientific schematic of a rough battery electrode with large particles and uneven SEI layer. An AFM tip struggles to scan due to steep surface topography. Arrows show interrupted tip motion. Clean, colorful, and technical illustration." See more