期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 49, 页码 54644-54652出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15793
关键词
composite; hierarchical structure; transition-metal sulfides; metal-organic frameworks; sodium-ion battery
资金
- City University of Hong Kong through the SRG projects [7005080, 7005285]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE19127]
- China Postdoctoral Science Foundation [2019M663695]
We introduce a hierarchical nanostructure of CoS2/N-doped carbon@MoS2 comprising two transition-metal sulfides CoS2 and MoS2, with enhanced sodium storage performance in sodium-ion batteries. A micron-sized Co metal-organic framework (MOF) is transformed into a CoS2/N-doped carbon composite, followed by a solvothermal growth of MoS2 nanosheets on the surface. The resulting composite material offers several specific advantages for sodium storage: (i) accelerated sodium-ion diffusion kinetics due to its heterogeneous interface; (ii) shortened ion diffusion path and exposed active sites for sodium storage due to its hierarchical nanosheet architecture; and (iii) homogeneous nitrogen doping of the MOF-derived carbon, which is beneficial for electronic conductivity. Due to these merits, this composite exhibits excellent electrochemical performance with a specific capacity of 596 mAh g(-1) after 100 cycles at 0.1 A g(-1) and 395 mAh g(-1) at 5.0 A g(-1).
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