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Lu et al. Advanced Rechargeable Lithium Batteries FIGURE 2 | (A–C) SEM images and (D) TEM image of NC@SWCNTs. (E) STEM image of NC@SWCNTs and the corresponding mapping images. FIGURE 3 | (A) XRD patterns of NC@SWCNTs@S, NC@SWCNTs@Se0.3S0.7, NC@SWCNTs@Se0.2S0.8, NC@SWCNTs@Se0.1S0.9 and NC@SWCNTs@Se. (B) Raman spectra of NC@SWCNTs@Se0.3S0.7, NC@SWCNTs@Se0,2S0.8 and NC@SWCNTs@Se0.1S0.9. stretching vibrations, (Chen et al., 2019; Pham et al., 2019). With increasing Se content in Se1-xSx, the strength of Se-Se and Se-S bonds are simultaneously increased, whereas the strength of S-S bonds are gradually decreased. Thus, it could be concluded that Se1-xSx composites are successfully synthesized. To further inspect the Se1-xSx content and thermal stability of NC@SWCNTs@Se1-xSx composites, TGA tests are performed as shown in Supplementary Figure S3. According to TG results, NC@SWCNTs@S and NC@SWCNTs@Se exhibit the lowest and highest onset decomposition temperatures of ∼130 and ∼300°C, Frontiers in Chemistry | www.frontiersin.org 4 July 2021 | Volume 9 | Article 738977PDF Image | Supercritical CO2 Synthesis of Freestanding Se1-xSx Foamy Cathodes for High-Performance Li-Se1-xSx Battery
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