A ZnSe/Bi2Se3 heterostructure as a sodium-ion battery anode displaying fast reaction kinetics, high capacity, and good full-cell performance

Abstract

Sodium-ion (Na-ion) batteries with a non-ideal reaction kinetic anode remain a key issue currently. Here, we present a heterostructured ZnSe/Bi₂Se₃ nanocluster coated with carbon displaying fast reaction kinetics. An in situ Raman spectrum evidences species change during charge–discharge, and an in situ X-ray diffraction pattern verifies a good reversibility. The ZnSe/Bi₂Se₃/NC anode exhibits a high specific capacity of 438 mA h g⁻¹ after 500 cycles at 0.2 A g⁻¹, and 386 mA h g⁻¹ after 1200 cycles at 1.0 A g⁻¹. High-performance cells cycling at −10 °C and 50 °C are achieved. These findings will lead to important applications for developing a broad set of energy-storage materials and battery systems.