Cooperative Catalysis of Polysulfides in Lithium‐Sulfur Batteries through Adsorption Competition by Tuning Cationic Geometric Configuration of Dual‐active Sites in Spinel Oxides

Abstract

Fundamentally understanding the structure-property relationship is critical to design advanced electrocatalysts for lithium-sulfur (Li-S) batteries, which remains a formidable challenge. Herein, by manipulating the regulable cations in spinel oxides, their geometrical-site-dependent catalytic activity for sulfur redox is investigated. Experimental and theoretical analyses validate that the modulation essence of cooperative catalysis of lithium polysulfides (LiPSs) is dominated by LiPSs adsorption competition between Co³⁺ tetrahedral (Td) and Mn³⁺ octahedral (Oh) sites on Mn³⁺ _Oh -O-Co³⁺ _Td backbones. Specifically, high-spin Co³⁺ _Td with stronger Co-S covalency anchors LiPSs persistently, while electron delocalized Mn³⁺ _Oh with adsorptive orbital (d_z ² ) functions better in catalyzing specialized LiPSs conversion. This work inaugurates a universal strategy for sculpting geometrical configuration to achieve charge, spin, and orbital topological regulation in electrocatalysts for Li-S batteries.