fig12

Figure 12. (A) Schematic of synthesis of Sn@NC composite and its (B) TEM image; (C) Long cycling performance of composite anodes at 5.0 A·g^-1 in the DEGDME-based electrolyte. Quoted with permission from Yang et al.^[108]; (D) Composition/nanostructure of SEIs probed by cryo-TEM and XPS. (a-f) HAADF STEM and TEM images of SEIs in (a, c, and e) NaBF₄/EC/DMC and (b, d and f) NaBF₄/diglyme with SAED as insets in (c and d). Note that the insets in (e and f) are the enlarged HRTEM and FFT images for the SEI layer region; (E) Cyclic stability of Sn microparticle electrodes; (F and G) The first three discharge/charge curves. Quoted with permission from Huang et al.^[110]. SnO₂@PDA: The SnO₂ nanorods were further encapsulated by dopamine; Sn@NC: 3D flower-like architecture consisting of nitrogen-doped carbon-coated tin nanorods; TEM: transmission electron microscopy; DEGDME: diethylene glycol dimethyl ether; SEIs: solid electrolyte interphases; XPS: X-ray photoelectron spectroscopy; HAADF: high-angle annular dark field; STEM: scanning transmission electron microscopy; TEM: transmission electron microscopy; EC: ethylene carbonate; DMC: dimethyl carbonate; SAED: selected area electron diffraction; HRTEM: high-resolution transmission electron microscopy; FFT: fast Fourier transform.