Fe3C@C composite fiber mats prepared by electrospinning with heat treatment and their application to Li-S batteries
Belgibayeva A. Zhuang Y. Taniguchi I.
1 November 2024Elsevier B.V.
Materials Letters
2024#374
The main challenges facing Li-S batteries stem from the low conductivity of sulfur and the dissolution of lithium polysulfides. This study addresses these issues by synthesizing Fe3C@C nanofibers through electrospinning followed by heat treatments, which are then applied as an interlayer in Li-S cells. The pre-oxidation temperature is adjusted to achieve the desired material properties, in which Fe3C nanoparticles are embedded in graphitic carbon nanofibers, resulting in a high specific surface area and mesopore volume. This configuration provides excellent polysulfide adsorption and catalytic properties for their further conversion. Consequently, when used as an interlayer, the electrochemical performance of the cell, including discharge capacity (first: 1174 vs. 850 mAh g−1 at 0.1 C), stability (852 vs. 400 mAh g−1 after 100 cycles), and rate-capability (620 vs. 100 mAh g−1 at 2 C), is significantly enhanced compared to cells without interlayer.
Electrospinning , Interlayer , Iron carbide , Lithium-sulfur batteries , Nanofibers
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Department of Chemical Science and Engineering, Tokyo Institute of Technology, Tokyo, 152-8552, Japan
National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Chemical Science and Engineering
National Laboratory Astana
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