科研之友
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摘要
SnS2/graphene composites have attracted extensive attention in energy storage owing to their excellent electrochemical performance. However, most of the previous methods to synthesize SnS2/graphene composites require long times, high temperatures, or high pressures, which are obstacles for practical low-cost production. A simple one-pot strategy to prepare SnS2/graphene composites has been developed, which is not time-consuming (1 h) and requires moderate temperature (75 degrees C) in atmosphere. Through this method, ultrafine SnS2 nanoparticles anchored on graphene nanosheets are prepared and exhibit excellent electrochemical performance for both lithium and sodium storage. Specifically, as anodes for lithiumion batteries, the SnS2/graphene electrode delivers a high capacity of 1480 mAhg(-1) after 50 cycles at 0.2 Ag-1. Even at 10 Ag-1, the SnS2/graphene electrode can achieve a capacity of 666 mAhg(-1). A constructed full lithium-ion cell exhibits a capacity of 957 mAhg(-1) after 50 cycles at 1 Ag-1. This simple one-pot strategy may pave the way for large-scale production and practical application of SnS2/graphene composites in energy storage.
