Carbon@SnS2 core-shell microspheres for lithium-ion battery anode materials
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A novel unique C@SnS2 core-shell structure composites consisting of well-dispersity carbon microspheres and ultrathin tin disulfide nanosheets were successfully synthesized for the first time through a simple solvothermal method. The thin SnS2 nanosheets grew onto the carbon microspheres surfaces perpendicularly and formed the close-knit porous structure. When it was used as anode materials for lithium-ion batteries, the hybrid C@SnS2 core-shell structure composites showed a remarkable electrochemical property than pure SnS2 nanosheets. Typically, the hybrid composites with SnS2 nanosheet shells and carbon microsphere’s core exhibited an excellent initial discharge capacity of 1611.6 mAh/g. Moreover, the hybrid composites exhibited capacities of 474.8–691.6 mAh/g at 100 mA/g over 50 battery cycles, while the pure SnS2 could deliver capacities of 243–517.6 mAh/g in the tests. The results indicated that the improvement of lithium storage performance of the core-shell structure C@SnS2 anode materials in terms of rate capability and cycling reversibility owing to the introduction of the smooth carbon microspheres and special designing of core-shell structure.
KeywordsSnS2 Carbon microspheres Core-shell structure Anode materials Lithium-ion batteries
We would like to acknowledge the Lanzhou University and Lanzhou Institute of Chemical Physics for providing the facilities for analysis, characterization, and testing.
The project was supported by the Key Research Projects in Gansu Province (No. 17YF1GA020).
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