Pre-intercalated Sodium Ions Enhance Sodium Storage of MoS 2 Anode by Mitigating Structural Dissociation

作者：Mingjun Cen, Rui Yan, Xinyu Luo, Huibin Liu, Bin Chen, Shuya Zhang, Wenchao Peng, Yang Li, Qicheng Zhang, Xiaobin Fan · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.4c05645 · 被引用次数：32 · 研究领域：Advancements in Battery Materials、MXene and MAX Phase Materials、Semiconductor materials and interfaces

Molybdenum disulfide (MoS 2 ) 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-MoS 2 ) as an anode material for SIBs. Because of the mitigation of MoS 2 structural dissociation and effective replenishment of active sodium ions, Na-MoS 2 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-MoS 2 to have greater tolerance to the electrochemical intercalation/extraction process. Furthermore, the conversion reaction of Na-MoS 2 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.