期刊
SCIENCE CHINA-MATERIALS
卷 64, 期 4, 页码 820-829出版社
SCIENCE PRESS
DOI: 10.1007/s40843-020-1477-0
关键词
metal-organic frameworks; CoS2; carbon nanotubes; anode; lithium-ion batteries
资金
- National Postdoctoral Program for Innovative Talents [BX20190157]
- China Postdoctoral Science Foundation [2019M660979]
- Fundamental Research Funds for the Central Universities, Nankai University [63201059]
- Program of Introducing Talents of Discipline to Universities [B18030]
- National Natural Science Foundation of China [21421001, 21531005]
- Natural Science Foundation of Tianjin [19JCZDJC37200]
The study successfully prepared an interconnected CoS2/N-doped carbon/carbon nanotube network to enhance its lithium storage performance. N-doped carbon can effectively accommodate the large volume expansion of CoS2 nanoparticles, and the 3D conductive nanostructure design provides adequate electrical/mass transport spacing.
Cobalt disulfide (CoS2) has been considered a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity of 870 mA h g(-1). However, its practical applications have been hampered by undesirable cycle life and rate performance due to the volume change and deterioration of electronic conductivity during the discharge-charge process. In this study, an interconnected CoS2/N-doped carbon/carbon nanotube (CoS2/NC-CNTs-700) network was successfully prepared to boost its lithium storage performance, in which small-size CoS2 nanoparticles were confined by N-doped carbon and uniformly decorated on the surface of CNTs. N-doped carbon can effectively accommodate the large volume expansion of CoS2 nanoparticles. Additionally, the 3D conductive nanostructure design offers adequate electrical/mass transport spacing. Benefiting from this, the CoS2/NC-CNTs-700 electrode demonstrates a long cycle life (a residual capacity of 719 mA h g(-1) after 100 cycles at 0.2 A g(-1)) and outstanding rate performance (335 mA h g(-1) at 5.0 A g(-1)). This study broadens the design and application of CoS2 and fosters the advances in battery anode research.
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