通过整合六金属高熵氧化物提高锂硫电池性能

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-04-13 DOI:10.1016/j.matlet.2025.138580

Hassan Raza , Sana Ullah , Awais Akhtar , Ghulam Abbas Gohar , Idris Temitope Bello , Ali Raza , Arslan Ahmed

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引用次数: 0

摘要

锂硫电池可以为电动汽车提供高能量密度。然而，它们的使用受到穿梭效应和缓慢的氧化还原动力学的阻碍，需要多金属电催化剂。采用MOF模板制备了一种新型高熵氧化物（Fe-HEO），并将其作为硫载体和电催化剂。Fe-HEO促进了多硫化物锂（LPS）活性位点的锚定，改善了氧化还原转化动力学。因此，Fe-HEO@S在0.1C时表现出高的放电容量（~ 1264mAh g - 1），并在500次循环（1C）后保持~ 616mAh g - 1，每个循环的衰减率较小，为0.08%。它还表现出卓越的倍率能力（在2C时约715mAh g−1）和73%的可逆性。本工作重点介绍了六金属HEO的制备，展示了Li-S电池优异的电化学性能。

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Enhancing lithium-sulfur battery performance through the integration of six-metal high entropy oxides

Lithium sulfur (Li-S) batteries could provide high energy density for electric vehicles. Nonetheless, their uses are hindered by the shuttle effect and slow redox kinetics, necessitating multi-metal electrocatalysts. A novel high entropy oxide (Fe-HEO) is fabricated using MOF template with six metals and used as sulfur host and electrocatalyst. The Fe-HEO facilitated active sites for lithium polysulfides (LPS) anchoring and improved redox conversion kinetic. Thus, Fe-HEO@S exhibited a high discharge capacity (∼1264mAh g⁻¹ at 0.1C) and maintained ∼ 616mAh g⁻¹ after 500 cycles (1C) with smaller decay rate of 0.08 % per cycle. It also demonstrated exceptional rate capability (∼715mAh g⁻¹ at 2C) and 73 % reversibility. This work highlights the fabrication of six metal HEO and showcases the excellent electrochemical performance of Li-S batteries.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive