Ionic liquid modified mesoporous silica (SAB-15) as an effective polysulfide reservoir for high-performance lithium sulfur batteries

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Vol. 33; no. 4; p. 103530
• Main Authors: Fan, Xuliang, Zhang, Yongfei, Wang, Yongyin, Chen, Fang, Hui, Yonghai
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2022
• Subjects: Carbon nanotube; Electrostatic force; Ionic liquid; Mesoporous silica; Sulfur cathode; Carbon nanotube; Sulfur cathode; Mesoporous silica; Ionic liquid; Electrostatic force
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2022.103530

[Display omitted] •The cation modified SBA-15 could exhibit a strong electrostatic attraction with polysulfides.•The Im-SBA-15/CNT/S cathode exhibits a steady cycle performance.•The Im-SBA-15/CNT composite is a promising sulfur host material for high-performance sulfur cathode. To restrict the polysulfide migration effectively, the fabrication of sulfur host material with strong polysulfide adsorption is necessary. Herein, we grafted the cation on SBA-15 surface to achieve the high-efficiency polysulfide reservoir through electrostatic force and the derived Im-SBA-15/CNT hybrid could exhibit a promising application potential as a host material for sulfur cathode owing to the strong polysulfide adsorption of Im-SBA-15 and the successful electron conduction of CNT. As a result, the Im-SBA-15/CNT/S composite delivers a superior electrochemical performance. Even after 350 cycles, Im-SBA-15/CNT/S cathode also could show a capacity of 682.3 mAh/gsulfur with no obvious capacity fading. This work demonstrates a promising polysulfide suppression strategy for high-performance sulfur cathode.