期刊
NANO ENERGY
卷 62, 期 -, 页码 154-163出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.030
关键词
Sodium-ion battery; Nickel sulfide; Metal-organic framework; Nitrogen-doped carbon; Anode
类别
资金
- National Natural Science Foundation of China [21421001, 21531005]
- Programme of Introducing Talents of Discipline to Universities [B18030]
Nickel sulfides are suitable anode materials for sodium-ion batteries (SIBs) because of their moderate cost and high theoretical capacity. Nevertheless, low cycling stability and rate performance caused by volume expansion and inferior electronic conductivity during the charge/discharge process still hamper their development. Herein, Ni3S2 nanoparticles uniformly embedded in N-doped carbon nanosheets (Ni3S2@C) are synthesized by sulfuration of a Ni-based metal-organic framework (Ni-MOF), followed by coating with polypyrrole (PPy). The PPy protects Ni3S2 particles from aggregation, and is converted to N-doped carbon shell during the annealing process. The nano-sized structure accelerates reaction kinetics and minimizes stress/strain caused by volume changes. The N-doped carbon nanosheets connect the transmission pathway of the electrons, and buffer the volume change during the electrochemical reaction. As expected, NiSx@C-600 delivers superior sodium storage performance with a high discharge capacity of 432.8 mA h g(-1) at 0.2 A g(-1) over 100 cycles and remarkable rate capacity of 371.6 mA h g(-1) at a high rate of 6.4 A g(-1). To the best of our knowledge, the obtained nanosheets exhibit the best rate performance among current Ni3S2 composites. The proposed method for enhancing conductivity and doping heteroatom by using PPy provides a novel insight to design SIB anodes with superior performance.
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