Abstract
Molybdenum disulfide (MoS2) has great potential applications for Na+-storage mainly for its high capacity and layered graphene-like structure. However, large volume changes and poor electrochemical kinetics restrict the electrochemical performances of metal chalcogenides. Thus, defective MoxW1-xS2/Cu7.2S4 (MWS/CS) polyhedrons (DPs) composed of heterostructured MWS/CS nanosheets have been synthesized by a liquid chemical technique. The heterointerface formed between MWS and CS is mainly ascribed to its high and stable performance by stabilizing the electrochemical reaction products, promoting the electrons and Na+ ions migration and buffering the volume expansion. Eventually, MWS/CS DPs displays a high reversible capacity (566 mAh/g at 0.2 A/g) with upper initial coulombic efficiency of 96.4 %, good rate capability (459.9, 419.2 and 417.2 mAh/g at 1.0, 5.0, 10.0 A/g, separately) and excellent cycling stability (553.1 mAh/g at 5.0 A/g after 1000 cycles).
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