The In-Situ Synthesis of a 3D SnS/N-Doped Graphene Composite with Enhanced Electrochemical Performance as a Low-Cost Anode Material in Sodium Ion Batteries

Materials

Ning-Jing Song¹  Canliang Ma² 

[1] College of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China;Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Institute of Molecular Science, Shanxi University, Taiyuan 030006, China;

关键词: SnS/N-doped graphene;    sodium ion battery;    in-situ synthesis;    phase transformation;   

DOI  :  10.3390/ma12122030

来源: DOAJ

【 摘 要 】

SnS/N-doped graphene (SnS/NG) composites are promising anode materials for sodium ion batteries. Generally, SnS is synthesized from SnCl₂·2H₂O. However, SnCl₂·2H₂O is not suitable for large-scale production due to its high price. Compared with SnCl₂·2H₂O, SnCl₄·5H₂O has a lower price, more stable chemical properties and better water solubility. Until now, there have been no related reports on the synthesis of SnS from SnCl₄·5H₂O. In this work, the fabrication of SnS/NG in a facile, two-step process, which combines a hot water bath and thermal annealing and uses SnCl₄·5H₂O as a precursor, is described. The mechanism of phase transformation in the direct synthesis of SnS from Sn⁴⁺ is also discussed in detail. Applying our methodology, SnS nanoparticles were grown in-situ on graphene sheets and wrapped by N-doped graphene sheets to form a 3D SnS/NG composite. With 35.35% content of graphene in the SnS/NG composite, the reversible specific capacity remained at 417.8 mAh/g at 1000 mA/g after 100 cycles, exhibiting a high specific capacity and good cycling stability. In addition, the composite also had an excellent rate performance, with a specific capacity of 366.9 mAh/g obtained even at 5000 mA/g. Meanwhile, the fast sodium storage kinetics of SnS/NG were also analyzed, providing some theoretical support for further study.

【 授权许可】

Unknown