Boosted electrochemical performance of sodium-ion batteries via Sn-Fe binary metal sulfides as anode materials

Abstract

The escalating demand for sustainable energy storage solutions has intensified the pursuit of advanced sodium-ion batteries (SIBs) as a cost-effective alternative to lithium-ion batteries. Central to this endeavor is the development of high-performance anode materials. In this study, we synthesized Sn-Fe binary metal sulfides as a promising anode material for SIBs, focusing on enhancing electrochemical performance through the modulation of Sn/Fe ratios. We discovered that adjusting the Sn/Fe composition not only optimizes the electrochemical activity window in half-cells but also significantly boosts the energy density in full-cell configurations. The synthesized Sn-Fe sulfides demonstrated superior capacity of 117.8 mAh g⁻¹ at 0.1C after 100 cycles, attributes pivotal for the practical application of SIBs. Our findings underscore the potential of Sn-Fe binary metal sulfides as a viable anode material for next-generation SIBs, offering a pathway to improved energy storage technologies. This work provides insights into the design principles for advanced anode materials and paves the way for further material optimization and applications in sodium-ion battery systems.