Pre-intercalated Sodium Ions Enhance Sodium Storage of MoS2 Anode by Mitigating Structural Dissociation

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-01-25 DOI:10.1021/acs.nanolett.4c05645

Mingjun Cen, Rui Yan, Xinyu Luo, Huibin Liu, Bin Chen, Shuya Zhang, Wenchao Peng, Yang Li, Qicheng Zhang, Xiaobin Fan

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Abstract

Molybdenum disulfide (MoS₂) is a promising anode for sodium-ion batteries (SIBs) due to its high theoretical capacity and layered structure. However, a poor reversible conversion reaction and a low initial Coulombic efficiency (ICE) limit its practical application. This study systematically investigated the potential of pre-intercalated sodium ions molybdenum disulfide (Na-MoS₂) as an anode material for SIBs. Because of the mitigation of MoS₂ structural dissociation and effective replenishment of active sodium ions, Na-MoS₂ delivered an outstanding capacity of 507.7 mAh g^–1 after 2000 cycles at 5 A g^–1, along with an ICE of 95.30%. Pre-intercalating sodium ions can expand interlayer spacing and modulate electronic structure, allowing Na-MoS₂ to have greater tolerance to the electrochemical intercalation/extraction process. Furthermore, the conversion reaction of Na-MoS₂ has a higher Gibbs free energy, implying its structural dissociation is thermodynamically unfavorable. This work provides a new perspective on the study of transition metal dichalcogenide electrode materials for SIBs.

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预嵌入的钠离子通过减轻结构解离提高MoS2阳极的钠储存

二硫化钼（MoS2）具有较高的理论容量和层状结构，是一种很有前途的钠离子电池负极材料。但其可逆转化反应差，初始库仑效率低，限制了其实际应用。本研究系统地研究了预插层二硫化钼钠离子（Na-MoS2）作为sib负极材料的潜力。由于减缓了MoS2的结构解离和活性钠离子的有效补充，在5 A g-1下循环2000次后，Na-MoS2提供了507.7 mAh g-1的出色容量，以及95.30%的ICE。预插层钠离子可以扩大层间间距和调制电子结构，使Na-MoS2对电化学插/萃取过程具有更大的耐受性。此外，Na-MoS2的转化反应具有较高的吉布斯自由能，表明其结构解离在热力学上是不利的。本研究为sib过渡金属二硫化物电极材料的研究提供了新的思路。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.