Figure 5: STEM imaging and charge mapping.
From: Phase evolution for conversion reaction electrodes in lithium-ion batteries
(a) Pristine NiO nanosheet. (b) NiO nanosheet with a 50% SOC (discharging). (c) NiO nanosheet with a fully discharged state. (d) NiO nanosheet with a 50% SOC (charging). (e) NiO nanosheet with a full cycle. (f–i) Charge mapping for a localized region with a 50% SOC, where (f), (g), (h) and (i) are STEM image, combined mapping profile, Ni ‘0’ mapping (green) and Ni ‘2+’ mapping (red), respectively. (j–l) EELS line profile, where (j), (k) and (l) are STEM image, EELS spectra and Ni ‘0’/Ni ‘2+’ concentration profiles, respectively. The arrows in (b) and (d) indicate the propagation direction of NiO-to-Ni and Ni-to-NiO conversions, respectively. The scale bars are 100 nm, 50 nm, 50 nm, 50 nm, 100 nm, 20 nm and 5 nm in (a), (b), (c), (d), (e), (f) and (j), respectively.
