Construction of a fast Li-ion path in a MOF-derived Fe3O4@NC sulfur host enables high-rate lithium–sulfur batteries. Issue 31 (18th July 2022)

• Record Type: Journal Article
• Authors: Zhao, Yifang; Wu, Lian; Yu, Yue; Dai, Yongqiang; Liao, Bing; Pang, Hao
• Is Part Of: Dalton transactions. Volume 51:Issue 31(2022)
• Page Start: 11665
• Page End: 11674
• Publication Date: 2022-07-18
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt01876d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : With an effective ion path structure and sufficient N-doping in the carbon skeleton, the MOF-derived Fe3O4@NC exhibited potential as the cathode in high-rate lithium–sulfur batteries. Abstract : Besides the adjustment of the active centres, the precisely designed microstructures of the carbon hosts also play a significant role in improving the battery performance. Herein, MOF-derived Fe3 O4 @NCs were prepared through a molten salt-assisted calcination method at different carbonization temperatures. Compared with the materials obtained at 700 °C, LK450 calcined at a lower temperature of 450 °C maintains suitable pore sizes and more N-doping and exhibits excellent Li-ion transport performance. Thus, the S/LK450 cathode can achieve an outstanding rate performance of up to 5 C (∼528 mA h g −1 ) and an extremely low capacity decay of 0.037% per cycle after 500 cycles at 1C. Notably, even with a high sulfur loading (4.0 mg cm −2 ), the S/LK450 cathode can still deliver a high capacity of 673 mA h g −1 at 0.2C after 100 cycles. Briefly, this work demonstrates the superiorities to prepare the samples at relatively low carbonization temperatures, which guarantee a better ion path structure and sufficient N-doping in the carbon skeleton.