Core–shell oxygen-deficient Fe2O3 polyhedron serves as an efficient host for sulfur cathode

Abstract

Herein, an oxygen-defect-rich core–shell Fe₂O_3−x@C polyhedral sulfur host was prepared, which effectively promoted electrochemical conversion and further inhibited the “shuttle effect” in lithium–sulfur (Li–S) batteries. Fe₂O_3−x@C@S provided a high initial capacity of 1395 mA h g⁻¹ and a low attenuation of ∼0.067% per cycle.