期刊
JOURNAL OF POWER SOURCES
卷 554, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.232333
关键词
SnSe; SnTe heterostructure; Porous carbon nanofibers; High-level self-N-Doping; Sodium ion batteries
This work presents a general and effective method for efficient sodium ion storage by constructing SnSe/SnTe nanodots in a nitrogen-doped mesoporous carbon matrix. The unique architecture provides high electronic/ion conductivity and reduces the volume change of the electrode materials, resulting in rapid kinetics and a robust structure. Additionally, the SnSe/SnTe heterostructure promotes charge transfer kinetics, while the high-level nitrogen doping induces abundant defective sites for sodium ion storage.
Sodium ion batteries (SIBs) have been considered as a promising candidate to supersede lithium ion batteries, however, the lack of suitable electrode materials for efficient Na-storage still hinders its practical use. Hence, this work reports a general and effective way to in-situ construction of heterostructured SnSe/SnTe nanodots encapsulated in nitrogen-doped mesoporous carbon matrix (SnSe/SnTe@N-CNFs). In such unique architecture, the porous N-CNFs matrix cannot only provide high electronic/ion conductivity but also alleviate the volume change of SnSe and SnTe, leading to rapid kinetics and robust structure, whereas the ultrasmall SnSe/SnTe heterostructure with built-in interfacial driving force can promote charge transfer kinetics. Meanwhile, the abundant defective sites induced from high-level N-doping is beneficial to Na+ storage. Besides, the formed Sn-C,
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