Abstract
Rechargeable sodium-ion batteries are receiving intense interest as a promising alternative to lithium-ion batteries, however, the absence of high-performance anode materials limits their further commercialization. Here we prepare cobalt-doped tin disulfide/reduced graphene oxide nanocomposites via a microwave-assisted hydrothermal approach. These nanocomposites maintain a capacity of 636.2 mAh g−1 after 120 cycles under a current density of 50 mA g−1, and display a capacity of 328.3 mA h g−1 after 1500 cycles under a current density of 2 A g−1. The quantitative capacitive analysis demonstrates that the electrochemical performance of the nanocomposite originates from the combined effects of cobalt and sulfur doping, resulting in the enhanced pseudocapacitive contribution (52.8 to 89.8% at 1 mV s−1) of tin disulfide. This work provides insight into tuning the structure of layered transition metal dichalcogenides via heteroatom doping to develop high-performance anode materials for sodium-ion batteries.
Highlights
Rechargeable sodium-ion batteries are receiving intense interest as a promising alternative to lithium-ion batteries, the absence of high-performance anode materials limits their further commercialization
For SnS2/RGO, after the introduction of RGO, the rate performance was significantly increased and this phenomenon is associated with the synergic effect of SnS2 with RGO9,20–22
An anode material based on a few-layered SnS2 with Co doping over an RGO matrix was synthesized in a few minutes by a microwave irradiation approach
Summary
Rechargeable sodium-ion batteries are receiving intense interest as a promising alternative to lithium-ion batteries, the absence of high-performance anode materials limits their further commercialization. On the basis of the combined conversion and alloying reaction, the layered metal sulfides such as tin disulfide (SnS2) and molybdenum disulfide (MoS2), show great promise for SIB anode application due to their demonstrated superior performance Among these metal sulfides, SnS2 has a typical layered structure with large interlamellar spacing (d = 0.5899 nm), which has drawn tremendous attention because of its high theoretical capacity of 1232 mAh g−1, ease to intercalation with Na+ and natural abundance. After the Co doping, the pseudocapacitance of SnS2/RGO is significantly enhanced, as inferred from the increased capacitive contribution during cycling Owing to this enhanced pseudocapacitive effect, limited few-layer structure, enlarged interlayer spacing and rich defects, the rationally designed Co-doped SnS2/RGO electrode exhibits enhanced reversible capacity, rate capability, and cycling stability as SIB anode, demonstrating that heteroatom doping is a feasible and general strategy for structural modification on metal chalcogenides to improve their electrochemical performance
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