High-Resolution TEM Observation of Sn Nanoparticles on SnO2 Nanotubes 1111
Figure 7. a: Time-series transmission electron microscopy (TEM) images showing the formation of agglomerated Sn nanoparticles (NPs) on the surface of SnO2 nanotubes upon lithiation. As time passes, individual as-formed Sn NPs combine with each other to form into Sn NP agglomerates. (b) Schematic illustration on the suggested agglomeration pathway of Sn NPs on the surface of SnO2, where Sn NPs are nucleated from respective SnO2 grains separated by white lines. c: Magnified high resolution-TEM images and corresponding fast Fourier transform (FFT) patterns of Sn NPs formed on the surface of SnO2. d: Average size and number of Sn NPs with respect to time.
Figure 8. a: High angle annular dark field scanning transmission electron microscopy image of SnO2 nanotube (NT) in graphene liquid cell (GLC) upon lithiation and (b) corresponding electron energy loss spectroscopy (EELS) mapping of the red-lined box in a, showing the formation of SEI layer. c: Corresponding EELS spectrum of the red-lined box in a.
