约束结构和扩展层间距对MoS2/C高效倍率和循环性能的协同效应

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

Materials Letters Pub Date : 2025-09-26 DOI:10.1016/j.matlet.2025.139536

Yu Fu , Renhong Song , Kun Zhang , Yujun Chen , Lijun Chen , Qianqiu Tian , Wenbin Hu

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引用次数: 0

摘要

过渡金属硫化物（tms）是一种很有前途的全固态锂电池（ASSLBs）正极材料，但其电子导电性差，体积膨胀严重。我们通过简单的水热合成法制备了具有扩展层间距（0.71 nm）的MoS2/C纳米球。放射状排列的纳米片结构最大化了电化学活性边缘位置，而扩展的中间层增强了Li+扩散动力学。原位形成的碳层提供了双重好处：抑制体积变化的结构限制和提高电子导电性。MoS2/C纳米球在1C下循环250次后提供385.1 mAh g - 1的卓越容量，大大优于大块MoS2和MoS2纳米片。这种结合层间扩展、分层形态和碳约束的协同设计为高性能ASSLBs阴极建立了有效的策略。

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Synergistic effects of confinement structure and expanded interlayer spacing on MoS2/C towards high-efficient rate and cycle performance

Transition-metal sulfides (TMSs) are promising cathode materials for all-solid-state lithium batteries (ASSLBs) but suffer from poor electronic conductivity and severe volume expansion. We developed MoS₂/C nanospheres featuring expanded interlayer spacing (0.71 nm) through facile hydrothermal synthesis. The radially arranged nanosheet architecture maximizes electrochemically active edge sites, while the expanded interlayers enhance Li⁺ diffusion kinetics. The in-situ formed carbon layer provides dual benefits: structural confinement to suppress volume changes and improved electronic conductivity. The MoS₂/C nanospheres deliver exceptional capacity of 385.1 mAh g⁻¹ after 250 cycles at 1C, substantially outperforming bulk MoS₂ and MoS₂ nanosheets. This synergistic design combining interlayer expansion, hierarchical morphology, and carbon confinement establishes an effective strategy for high-performance ASSLBs cathodes.

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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