Abstract
The development of advanced sodium-ion batteries is hindered by the low sluggish kinetics and electrochemical performance. In this work, heterostructure-decorated core-shell Fe3Se4/ZnSe@carbon (Fe3Se4/ZnSe@C) nanospheres were designed to boost the kinetics. The electrochemical and structural study results demonstrate that hetero-interfaces between Fe3Se4 and ZnSe not only propel fast transport of charges but also effectively enhance the reaction kinetics. The carbon shell enables to improve the electronic conductivity and maintains the structural stability of the active materials. In addition, the electrochemical mechanism is also investigated via the in-situ X-ray diffraction technique. When the resulted Fe3Se4/ZnSe@C composite material is employed as the anode materials of sodium-ion batteries, it shows ultrafast charging-discharging kinetics and outstanding cycling stability with a high capacity retention of 473.8 mAh g−1 after 300 cycles at a large current density of 5 A g−1. This work offers a strategy of enhancing reaction kinetics as well as a synthetic route for high-performance anode materials for sodium storage.
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