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Exploiting deep sulfur conversion by tandem catalysis for all-solid-state lithium-sulfur batteries.

Huilin Ge^1,2, Yu Long^1,2,3,4, Dulin Huang⁵

¹Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage, State Key Laboratory of Chemical Engineering and Low-Carbon Technology, School of Chemical Engineering and Technology, National Industry-Education Integration Platform of Energy Storage, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China.

National Science Review

|January 15, 2026

Summary

This study introduces tandem catalysis for all-solid-state lithium-sulfur batteries (ASSLSBs), enabling deep sulfur conversion to Li₂S via Li₂S₂. This approach significantly boosts battery capacity and cycle life.

Keywords:

Co single atoms MXene all-solid-state batteries lithium–sulfur batteries tandem catalysis

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

All-solid-state lithium-sulfur batteries (ASSLSBs) offer high energy density and safety.
Incomplete sulfur conversion limits the full capacity of ASSLSBs.

Purpose of the Study:

To achieve deep conversion of S₈ to Li₂S via Li₂S₂ using tandem catalysis.
To enhance the capacity and performance of ASSLSBs.

Main Methods:

Utilizing cobalt single-atom catalysts (Co SACs) on a MXene substrate for tandem catalysis.
Investigating the stepwise reduction of S₈ to Li₂S through the Li₂S₂ intermediate.

Main Results:

Demonstrated stepwise S₈ reduction to Li₂S via Li₂S₂ using Co@MXene.
Co SACs broke S-S bonds, and MXene facilitated Li⁺ diffusion, lowering energy barriers.
Achieved a high capacity of 1329 mAh g⁻¹ after 2000 cycles at 2.8 mA cm⁻² at room temperature.

Conclusions:

Tandem catalysis effectively tailors the sulfur conversion pathway in ASSLSBs.
This strategy unlocks deep sulfur conversion for high-performance ASSLSBs.