Enhancing lithium-sulfur battery performance through the integration of six-metal high entropy oxides

Lithium sulfur (Li-S) batteries could provide high energy density for electric vehicles. Nonetheless, their uses are hindered by the shuttle effect and slow redox kinetics, necessitating multi-metal electrocatalysts. A novel high entropy oxide (Fe-HEO) is fabricated using MOF template with six metals and used as sulfur host and electrocatalyst. The Fe-HEO facilitated active sites for lithium polysulfides (LPS) anchoring and improved redox conversion kinetic. Thus, Fe-HEO@S exhibited a high discharge capacity (∼1264mAh g⁻¹ at 0.1C) and maintained ∼ 616mAh g⁻¹ after 500 cycles (1C) with smaller decay rate of 0.08 % per cycle. It also demonstrated exceptional rate capability (∼715mAh g⁻¹ at 2C) and 73 % reversibility. This work highlights the fabrication of six metal HEO and showcases the excellent electrochemical performance of Li-S batteries.