Simple synthesis of MoSSe heterojunction nanosphere for ultrafast kinetics and high-performance sodium-ion battery

Sodium-ion batteries (SIBs) are expected to be an effective solution for energy storage to be applied to various electronic devices due to their cost-effective performance and similar working principles to lithium-ion batteries (LIBs). However, the electrochemical performances of SIBs are currently hindered by the challenges posed by the large size and slow diffusion kinetics of Na+. Chalcogenide heterojunctions have great potential in SIBs anode materials. Therefore, this study presents a MoSSe heterojunction with a three-dimensional flower-like spherical structure. This heterojunction exhibits enhanced Na+ adsorption and storage capabilities, a high rate of Na+ diffusion, and improved structural stability. These excellent structures and characteristics are highly beneficial for Na(+ )storage, demonstrating superior stability, and large capacity. Consequently, the designed MoSSe exhibits long cycling stability at 5.0 A g(-1) (195.2 mAh g(-1) after 2000 cycles) and exceptional capacity at 0.1 A g(-1) (413.1 mAh g(-1)). This work demonstrates that heterojunctions can become excellent electrode materials for SIBs to achieve stable sodium energy storage.