Se-Regulated MnS Porous Nanocubes Encapsulated in Carbon Nanofibers as High-Performance Anode for Sodium-Ion Batteries

作者：Puwu Liang, Duo Pan, Xiangyun Hu, Ke Yang, Yangjie Liu, Zijing Huo, Bo Zheng, Lihong Xu, Junhua Xu, Zhenhai Wen · 发表于：Nano-Micro Letters · 年份：2025 · DOI：10.1007/s40820-025-01767-4 · 被引用次数：26 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

Abstract Manganese-based chalcogenides have significant potential as anodes for sodium-ion batteries (SIBs) due to their high theoretical specific capacity, abundant natural reserves, and environmental friendliness. However, their application is hindered by poor cycling stability, resulting from severe volume changes during cycling and slow reaction kinetics due to their complex crystal structure. Here, an efficient and straightforward strategy was employed to in-situ encapsulate single-phase porous nanocubic MnS 0.5 Se 0.5 into carbon nanofibers using electrospinning and the hard template method, thus forming a necklace-like porous MnS 0.5 Se 0.5 -carbon nanofiber composite (MnS 0.5 Se 0.5 @N-CNF). The introduction of Se significantly impacts both the composition and microstructure of MnS 0.5 Se 0.5 , including lattice distortion that generates additional defects, optimization of chemical bonds, and a nano-spatially confined design. In situ/ex-situ characterization and density functional theory calculations verified that this MnS 0.5 Se 0.5 @N-CNF alleviates the volume expansion and facilitates the transfer of Na + /electron. As expected, MnS 0.5 Se 0.5 @N-CNF anode demonstrates excellent sodium storage performance, characterized by high initial Coulombic efficiency (90.8%), high-rate capability (370.5 mAh g −1 at 10 A g −1 ) and long durability (over 5000 cycles at 5 A g −1 ). The MnS 0.5 Se 0.5 @N-CNF //NVP@C full cell, assembled with MnS 0.5 Se 0.5 @N-CNF as anode and Na ...