2D Confined Alloying‐Type SnS Anode Enabled by van der Waals Interaction for Fast and Long‐Life Sodium Storage

作者：Shuai Li, Hao Nie, Keyan Hu, Yuting He, Youtan Pan, Wen Chen, Haibang Zhang, Chong Zheng, Fuqiang Huang · 发表于：Small · 年份：2025 · DOI：10.1002/smll.202511428 · 被引用次数：4 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、MXene and MAX Phase Materials

Abstract Sodium ion batteries (SIBs) are facing a shortage of anode materials with high‐capacity, durable, and high‐rate performance. SnS is a promising alloying‐type anode with high theoretical capacity, but still faces serious problems such as large volume expansion and sluggish ion transport kinetics. Herein, a van der Waals interaction strategy is proposed by atomically disperse SnS into interlayers of 2D 2D NbS 2 frameworks to form (SnS) 1.18 NbS 2 . In situ and ex situ analyses reveal the multistep reversible reaction processes during the charging (formation of layered structure NbS 2 confining amorphous SnS, (SnS) Amorphous NbS 2 ) and discharging (precipitation of fracture‐resistant Na 9 Sn 4 in the ionic‐conductive Na 0.67 NbS 2 /Na 2 S matrix) processes. Consequently, the (SnS) 1.18 NbS 2 anode exhibits a capacity of 943 mAh cm −3 at 0.44 C after 150 cycles, and retains 667 mAh cm −3 at 11 C after 2500 cycles with 100% capacity retention. The assembled (SnS) 1.18 NbS 2 || Na 3 V 2 (PO 4 ) 3 full cell maintains ≈100% capacity retention over 1000 cycles at 15 C. The full cell also exhibits good low‐temperature performance at −20 °C with a capacity retention of 100% after 1200 cycles at 1 C. The proposed van der Waals interaction strategy for stabilizing fast and high‐capacity Na + storage offers a viable pathway for practical SIBs.