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Abstract
Mixed metal sulfide composite microspheres with a yolk-shell structure for sodium-ion
batteries are studied. Tin-molybdenum oxide yolk-shell microspheres prepared by a
one-pot spray pyrolysis process transform into yolk-shell SnS-MoS2 composite microspheres.
The discharge capacities of the yolk-shell and dense-structured SnS-MoS2 composite
microspheres for the 100th cycle are 396 and 207 mA h g(-1), and their capacity retentions
measured from the second cycle are 89 and 47%, respectively. The yolk-shell SnS-MoS2
composite microspheres with high structural stability during repeated sodium insertion
and desertion processes have low charge-transfer resistance even after long-term cycling.
The synergetic effect of the yolk-shell structure and uniform mixing of the SnS and
MoS2 nanocrystals result in the excellent sodium-ion storage properties of the yolk-shell
SnS-MoS2 composite microspheres by improving their structural stability during cycling.