5 years ago

In Situ Construction of 3D Interconnected FeS@Fe3C@Graphitic Carbon Networks for High-Performance Sodium-Ion Batteries

In Situ Construction of 3D Interconnected FeS@Fe3C@Graphitic Carbon Networks for High-Performance Sodium-Ion Batteries
Qinghong Wang, Can Guo, Wenchao Zhang, Zaiping Guo, Chao Wang, Yajie Liu
Iron sulfides have been attracting great attention as anode materials for high-performance rechargeable sodium-ion batteries due to their high theoretical capacity and low cost. In practice, however, they deliver unsatisfactory performance because of their intrinsically low conductivity and volume expansion during charge–discharge processes. Here, a facile in situ synthesis of a 3D interconnected FeS@Fe3C@graphitic carbon (FeS@Fe3C@GC) composite via chemical vapor deposition (CVD) followed by a sulfuration strategy is developed. The construction of the double-layered Fe3C/GC shell and the integral 3D GC network benefits from the catalytic effect of iron (or iron oxides) during the CVD process. The unique nanostructure offers fast electron/Na ion transport pathways and exhibits outstanding structural stability, ensuring fast kinetics and long cycle life of the FeS@Fe3C@GC electrodes for sodium storage. A similar process can be applied for the fabrication of various metal oxide/carbon and metal sulfide/carbon electrode materials for high-performance lithium/sodium-ion batteries. 3D interconnected FeS@Fe3C@graphitic carbon networks are constructed via a chemical vapor deposition method followed by a sulfuration process. The unique nanostructure endows the FeS@Fe3C@GC composite with high discharge capacity, good rate capability, and excellent cycling stability as anode for sodium-ion batteries. The strategy can be extended to the fabrication of other metal oxide/carbon and metal sulfide/carbon electrode materials.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201703390

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