Work

RuO 2 ‐Based High‐Entropy Oxide and Its Asymmetric Catalysis on Polysulfide Conversion in Lithium–Sulfur Batteries

Year: 2026

Type: article

Abstract: High-entropy oxides (HEOs) with five or more metal components in a single oxide phase, hold attractive potential to enhance the lithium polysulfides (LiPSs) adsorption-catalysis ability in Li-S batteries due to the noteworthy synergistic effect of the multiple metal sites. Herein, we have synthesized a RuO 2 -based HEO, i.e. (RuIrFeCoNi)O 2 via a simple molten salt method for Li-S batteries. Our results prove that the introduction of multiple metal components endows HEO with moderate adsorption of LiPSs and promising bidirectional catalysis on the liquid-solid conversion between soluble LiPSs and insoluble Li 2 S. Particularly, compared with the quaternary (RuFeCoNi)O 2 catalyst, the inferior kinetics enhancement of the LiPSs generation, but the superior promotion of Li 2 S deposition for HEO greatly favors the inhibition of shuttle effect. Such an asymmetric catalysis behavior induces remarkable electrochemical performance of Li-S batteries assembled with HEO-modified separator. High specific capacities of 1641.1 mAh g -1 at 0.1 C and 812.5 mAh g -1 at 2 C are achieved. Remarkably, superior cycle stability is realized with a low capacity decay rate of only 0.060% per cycle within 1000 cycles at 1 C rate. This study unveils the catalytic mechanism of HEO in promoting polysulfide conversion and offers a robust foundation for designing efficient catalysts for Li-S batteries.

Source: Energy & environment materials

DOI: 10.1002/eem2.70282

Authors: Jingyi Zhou, Youliang Wang, Guixiang Zhong, Liyuan Tian, Yeqiang Che, Ze Zhang

Institutions: Nanchang University, Jiangxi Science and Technology Normal University

Language: English

Topic: Advanced Battery Materials and Technologies

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,000