Figure 4.

(A) Schematic illustration of preparation and structure of the covalent sulfur–carbon composite synthesized with CS₂ and red phosphorus and the corresponding long cycle performance at 0.8C. Figure 4A was reprinted with permission from [36]. Copyright 2020, The American Chemical Society. This content is not subject to CC BY 4.0. (B) Schematic representation of the synthesis processes of C‐BSA, C‐BDSA, and SC‐BDSA and the cyclic performance and Coulombic efficiency of the activated SC‐BDSA electrode for Na–S battery system at 2500 mA·g⁻¹ for 1000 cycles. Figure 4B was reprinted with permission from [37], T. Wu et al. "Controllable Chain-Length for Covalent Sulfur–Carbon Materials Enabling Stable and High-Capacity Sodium Storage", Adv. Energy Mater., with permission from John Wiley and Sons Copyright © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This content is not subject to CC BY 4.0. (C) Cycling performance of Se_0.08S_0.92@pPAN and S@pPAN in an ether electrolyte. Figure 4C was republished with permission of The Royal Society of Chemistry, from [38] ("Effect of eutectic accelerator in selenium-doped sulfurized polyacrylonitrile for high performance room temperature sodium–sulfur batteries" by L. Wang et. al., J. Mater. Chem. A, vol. 7, © 2019); permission conveyed through Copyright Clearance Center, Inc. This content is not subject to CC BY 4.0”.