Fig. 3: TEM data for the fully discharged and charged α-Fe2O3.
From: Non-equilibrium metal oxides via reconversion chemistry in lithium-ion batteries
TEM results for the α-Fe2O3 sample collected at a–c the beginning of charge (“Li = 0.0”) and d-f the end of charge (“Li = –2.0”). High-resolution TEM images (a) and (d) show that the bcc-Fe lattice is retained with {110} interlayer spacing of about 0.20 nm (Supplementary Fig. 9) in both structures (scale bar in the bottom left corner indicates 10 nm). The preservation of the bcc-Fe ordering is further supported by the indexing in (b) and (e) obtained from fast Fourier transform (FFT) of the highlighted region in (a) and (d). Fourier filtered images (c) and (f) based on FFT exhibit a Fe lattice comparable to the experimental pattern highlighted in (a) and (d).
