The C─S/C═S Bonds Synergistically Modify Porous Hollow‐Carbon‐Nanocages Anode for Durable and Fast Sodium‐Ion Storage
Huiyan Feng, Zhendong Liu, Fei Wang, Lingxiao Xue, Linqing Li, Chong Ye, Chengzhi Zhang, Quanbing Liu, Jun Tan
Abstract
Abstract Sulfur doping in carbonaceous anode is a popular method to improve the sodium storing performance. Regulating the C/S bond effect of carbon atom with doped sulfur atom could understand and develop superior carbonaceous anode for sodium‐ion batteries. Therefore, this study designed porous hollow carbon nanocages with synergistically‐doped C/S bonds (C‐S/C = S) by secondary‐sulfidation. The secondary‐sulfidation is conducive to the different bond formation of sulfur atom with carbon skeleton and adjust the structure via removed other groups. Thus, the C‐S/C = S anode with synergistically C‐S and C = S bonds delivered a reversible capacity of 307 mAh g‐1 at 1.0 A g −1 with initial coulomb efficiency of 80.15%, a stable cycle life of 2000 cycles, and a fast charge capability of 186 mAh g −1 at 20.0 A g −1 in sodium‐ion batteries. Through characterization and simulation results, the doped C‐S/C = S bonds creates more active sites and ion diffusion channels in carbon skeleton for enhancing the fast and durable kinetics of sodium‐ion. This work provides deep insights into C/S bonds effect of carbon anode material for developing fast charge stability sodium‐ion batteries.