Issue 31, 2022

Construction of a fast Li-ion path in a MOF-derived Fe3O4@NC sulfur host enables 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 Fe3O4@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.

Graphical abstract: Construction of a fast Li-ion path in a MOF-derived Fe3O4@NC sulfur host enables high-rate lithium–sulfur batteries

Supplementary files

Article information

Article type
Paper
Submitted
14 Jun 2022
Accepted
06 Jul 2022
First published
11 Jul 2022

Dalton Trans., 2022,51, 11665-11674

Construction of a fast Li-ion path in a MOF-derived Fe3O4@NC sulfur host enables high-rate lithium–sulfur batteries

Y. Zhao, L. Wu, Y. Yu, Y. Dai, B. Liao and H. Pang, Dalton Trans., 2022, 51, 11665 DOI: 10.1039/D2DT01876D

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