Extended Data Fig. 3
From: Glassy Li metal anode for high-performance rechargeable Li batteries
Cryogenic STEM image (a), EELS Mapping (b) and spectra (c) of EDLi obtained at 0.5 mA cm-2 for 2h. The EELS mapping (b) is based on the intensity EELS spectra ranging from 53.5 eV to 58.5 eV (highlighted by the blue square in c), which contains the characteristic metallic/elemental Li K-edge threshold at about 55 eV. c presents the EELS spectra taken from Area 1 and Area 2 (labeled in b) representing the feature of highly crystalline Li and glassy Li respectively. Due to the presumed same SEI on the surface of Area 1 and Area 2, they show similar extended fine structure of Li K-edge after 60 eV. Both of them have the obvious characteristic metallic/elemental Li K-edge threshold at about 55 eV while the highly crystalline Li Area 1 shows a peak with slightly higher intensity than the glassy Li Area 2. This is reasonable due to the different degree of order/disorder structure in these two areas. It is worth to noting that it is difficult to obtain the higher-resolution STEM mapping due to the radiation damage caused by the high-energy beam used for STEM scanning even at cryogenic temperature.
