fig2

Figure 2. (A) Raman spectra of freshly annealed LLZO nanofibers from 3 to 246 min of air exposure as depicted on the right; (B-D) Detailed spectra showing peak shifts and intensity changes for (B) LLZO lattice vibrations; (C) Zr-O vibrations; and (D) C-O vibrations in Li₂CO₃; (E) Normalized integration of the Li₂CO₃ peak over time. Kinetics are estimated for pseudo-first-order reactions; (F) Spectra of the Zr-O band for LLZO NFs before and after 16 h of air exposure as well as 16 h of anhydrous treatment with GPS followed by 4 h of air exposure; (G) Comparison of the Zr-O band of freshly annealed LLZO NFs and LLZO NFs treated with GPS under acidified aqueous methanol and anhydrous toluene conditions. Raman shifts of the peak centers are labeled. LLZO: Li₇La₃Zr₂O₁₂; NFs: Nanofibers; GPS: Silane with terminal epoxide group.