Abstract
Due to the large size of Na+ and the slow redox kinetics, the energy storage performance of sodium ion batteries (SIBs) is far from satisfactory. Heterojunction with layered structure has great potential in advanced material of SIBs. Herein, the 3D flower spheres MoSe2/NiSe heterostructure with fast dynamic properties was proposed, which shows enhancement in the adsorption and storage capacity of Na+ with a low migration energy barrier. Unique structure design can further effectively alleviate the volume expansion during sodiation/desodiation process. Furthermore, the DFT calculation results reveal the charge transfer mechanism between NiSe and MoSe2, as well as improved intrinsic electric structure of MoSe2/NiSe. In consequence, the designed MoSe2/NiSe possesses a good cyclability over 3000 cycles with a capacity of 172 mAh/g at 5.0 A/g, and the full cell with Na3V2(PO4)3/C cathode shows high-rate performance of 276 mAh/g at 2.0 A/g, which solidly proves the feasibility of the designed MoSe2/NiSe anode in the practical application. This work shows that the heterojunction can achieve long-lasting sodium electrochemistry and expand to other energy storage fields.
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