Abstract
A novel anode material for sodium-ion batteries consisting of 3D graphene microspheres divided into several tens of uniform nanospheres coated with few-layered MoS 2 by a one-pot spray pyrolysis process is prepared. The first discharge/charge capacities of the composite microspheres are 797 and 573 mA h g -1 at a current density of 0.2 A g -1 . The 600th discharge capacity of the composite microspheres at a current density of 1.5 A g -1 is 322 mA h g -1 . The Coulombic efficiency during the 600 cycles is as high as 99.98%. The outstanding Na ion storage properties of the 3D MoS 2 -graphene composite microspheres may be attributed to the reduced stacking of the MoS 2 layers and to the 3D structure of the porous graphene microspheres. The reduced stacking of the MoS 2 layers relaxes the strain and lowers the barrier for Na + insertion. The empty nanospheres of the graphene offer voids for volume expansion and pathways for fast electron transfer during repeated cycling.
Original language | English |
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Pages (from-to) | 1780-1788 |
Number of pages | 9 |
Journal | Advanced Functional Materials |
Volume | 25 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2015 Mar 25 |
Keywords
- 3D graphene
- anode materials
- metal sulfide
- sodium-ion batteries
- spray pyrolysis
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics