Journal
SMALL
Volume 15, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201805405
Keywords
defects; high rate; long life; MoS2; sodium storage
Categories
Funding
- Shaanxi Natural Science Foundation of China [2017JM5006]
- Provincial Key Academic Leaders Scientific Research Foundation [BJ15-01]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201617]
- Natural Science Advance Research Foundation of Shaanxi University of Science and Technology [2016QNBJ-08]
- [XSD1445]
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Molybdenum disulfide (MoS2), a 2D-layered compound, is regarded as a promising anode for sodium-ion batteries (SIBs) due to its attractive theoretical capacity and low cost. The main challenges associated with MoS2 are the low rate capability suffering from the sluggish kinetics of Na+ intercalation and the poor cycling stability owning to the stack of MoS2 sheets. In this work, a unique architecture of bundled defect-rich MoS2 (BD-MoS2) that consists of MoS2 with large vacancies bundled by ultrathin MoO3 is achieved via a facile quenching process. When employed as anode for a SIB, the BD-MoS2 electrode exhibits an ultrafast charge/discharge due to the pseudocapacitive-controlled Na+ storage mechanism in it. Further experimental and theoretical calculations show that Na+ is able to cross the MoS2 layer by vacancies, not only limited to diffusion along the layer, thus realizing a 3D Na+ diffusion with faster kinetics. Meanwhile, the bundling architecture reduces the stack of sheets with a superior cycle life illustrating the highly reversible capacities of 350 and 272 mAh g(-1) at 2 and 5 A g(-1) after 1000 cycles.
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