Carbon@SnS 2 core-shell microspheres for lithium-ion battery anode materials

摘要

A novel unique C@SnS~(2)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 SnS~(2)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@SnS~(2)core-shell structure composites showed a remarkable electrochemical property than pure SnS~(2)nanosheets. Typically, the hybrid composites with SnS~(2)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 SnS~(2)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@SnS~(2)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.