Sulfur-induced porous carbon nanofibers composite SiO as bifunctional anode for high-performance Li-ion storage

• Published in: Journal of materials science 2022-03, Vol.57 (10), p.5954-5963
• Main Authors: jin, Mengjing, Zhou, Hongyan, Sun, Guowen, Zhao, Jianguo, Li, Jian
• Format: Article
• Language: English
• Subjects: Annealing; Anodes; Carbon fibers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Electric properties; Electrode materials; Electrolytes; Energy Materials; Ion storage; Lithium ions; Materials Science; Nanofibers; Polymer Sciences; Povidone; Solid Mechanics; Specific surface; Sulfur; Sulfur compounds; Surface area
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-07022-0

Non-conductivity and volume expansion are the main factors hindering the development of SiO anode materials. To solve these problems, in this work, a bifunctional anode was prepared with sulfur-induced SiO embedded carbon nanofibers (SiO–S–CNFs) by the electrospinning method and followed by annealing. Benefitting from the good conductance of CNFs, SiO–S–CNFs showed fast kinetics during charging and discharging. The introduction of sulfur powder during annealing formed a porous CNFs skeleton, further increasing the specific surface area of CNFs and effectively inhibiting the volume expansion of SiO. The large specific surface area also increased the contact between the electrode and the electrolyte and exposed more reaction sites of SiO. Results show that the reversible capacity of the cell was 376 mAh g −1 after 500 cycles at 1 A g −1 . The SiO–S–CNFs electrode exhibited a high reversible capacity of 598 and 204 mAh g −1 at current densities from 0.1 to 2 A g −1 , respectively. This work offers a feasible and simple method to ameliorate the electrochemical stability of silicon-based composite LIBs electrodes.