Volume 137, Issue 9 e202420866
Forschungsartikel

Alloying Strategy Regulating Size and Electronic Structure of Mo0.25Nb0.75Se2 to Achieve High-Performance Lithium−Sulfur Batteries

Dr. Jia Yuan

Dr. Jia Yuan

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - original draft (lead), Writing - review & editing (equal)

Search for more papers by this author
Dr. Peng Wang

Dr. Peng Wang

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Dr. Ning Song

Dr. Ning Song

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Yu Wang

Yu Wang

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Dr. Jizhen Ma

Dr. Jizhen Ma

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Prof. Shenglin Xiong

Prof. Shenglin Xiong

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Dr. Xiaogang Li

Dr. Xiaogang Li

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Prof. Jinkui Feng

Prof. Jinkui Feng

School of Materials Science and Engineering, Shandong University, Jinan, 250061 P. R. China

Contribution: Writing - review & editing (supporting)

Search for more papers by this author
Prof. Baojuan Xi

Corresponding Author

Prof. Baojuan Xi

School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100 P. R. China

Contribution: Conceptualization (lead), Formal analysis (lead), Funding acquisition (lead), Writing - review & editing (lead)

Search for more papers by this author
First published: 02 December 2024

Abstract

The utilization of catalysts in lithium−-sulfur batteries has proven to be an efficacious avenue for enhancing the kinetics of polysulfide conversion. Specially, the size and electronic structure of catalysts play a pivotal role in harnessing the active sites and intrinsic catalysis activity. Outstanding MoSe2 and NbSe2 are were selected from 16 universal transition metal selenides based on the proposed binary descriptor. Then, an alloying strategy is was devised to prepare Mo0.25Nb0.75Se2 flakelets for further improvement of the intrinsic catalysis. The integration of density functional theory calculations and electrochemical analysis demonstrates that alloying Mo with Nb can regulate the surface energy and indexes of band match and lattice mismatch, thereby enabling Mo0.25Nb0.75Se2 to possess a small size, suitable adsorption energy and low reaction energy barrier. This optimization enhances the catalysis of sulfur reduction/evolution reaction and the reversible deposition/stripping of lithium. Consequently, an assembled Ah-level pouch cell is realized with dramatic cycle stability. With the electrolyte/sulfur ratio of 2.36 μL mg S−1, the cell can deliver a high energy density of up to 505.4 Wh kgtotal−1. This work pioneers a universal strategy for sculpting the geometric configurations and electronic structures of catalysts, to achieve enhanced catalytic activity and precise interpretation of structure–activity relationships.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.