Fabrication and lithium storage performances of a composite of tin disulfide and ordered mesoporous carbon

Abstract

SnS₂ has been investigated as anode material for lithium ion batteries. To obtain anode material having high capacity and long-term lifespan, in the present work, a nanostructured composite comprising SnS₂ nanosheets and CMK-3 ordered mesoporous carbon has been designed. The CMK-3/SnS₂ composite is fabricated via incipient wetness impregnation, followed by chemical reduction and chemical conversion in an inert gas at high temperature. The obtained composite exhibits boosted lithium storage behaviors involving high specific capacity, fast rate response and stable cyclability. At a discharge-charge rate of 100 mA g⁻¹ the CMK-3/SnS₂ electrode delivers a specific capacity of 985.2 mA h g⁻¹ with the utilization efficiency of SnS₂ present in the composite of90.5 %. Even, after 500 cycles testing at higher discharge-charge rates of 0.5 and 1 A g⁻¹, CMK-3/SnS₂ still can maintain specific capacities of 556.2 and 402.9 mA h g⁻¹ , respectively, much higher than the theoretical specific capacity of commercialized graphite anode material. This work demonstrates considerable application potential of the CMK-3/SnS₂ anode in Li-ion batteries.