Impregnation of Se<sub>2</sub>S<sub>6</sub> into a Nitrogen- and Sulfur-Co-Doped Functional Metal Carbides and Nitrides for High-Performance Li-S Batteries

Impregnation of Se<sub>2</sub>S<sub>6</sub> into a Nitrogen- and Sulfur-Co-Doped Functional Metal Carbides and Nitrides for High-Performance Li-S Batteries

In this study, nitrogen- and sulfur-co-doped MXene (NS-MXene) was developed as a high-performance cathode material for lithium–sulfur (Li-S) batteries. Heterocyclic Se<sub>2</sub>S<sub>6</sub> molecules were successfully confined within the NS-MXene structure using a simple m...

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Bibliographic Details
Main Authors: Lu Chen, Zhongyuan Zheng, Shuo Meng, Wenwei Wu, Weicheng Zhou, Shanshan Yang, Kexuan Liao, Yuanhui Zuo, Ting He
Format: Article
Language:English
Published: MDPI AG 2025-02-01
Series:Molecules
Subjects:
Se<sub>2</sub>S<sub>6</sub>
heteroatom dope
MXene
cathode
Li-S batteries
Online Access:https://www.mdpi.com/1420-3049/30/5/1070
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Summary:In this study, nitrogen- and sulfur-co-doped MXene (NS-MXene) was developed as a high-performance cathode material for lithium–sulfur (Li-S) batteries. Heterocyclic Se<sub>2</sub>S<sub>6</sub> molecules were successfully confined within the NS-MXene structure using a simple melt impregnation method. The resulting NS-MXene exhibited a unique wrinkled morphology with a stable structure which facilitated rapid ion transport and provided a physical barrier to mitigate the shuttle effect of polysulfide. The introduction of nitrogen and sulfur heteroatoms into the MXene structure not only shifted the Ti d-band center towards the Fermi level but also significantly polarizes the MXene, enhancing the conversion kinetics and ion diffusion capability while preventing the accumulation of Li<sub>2</sub>S<sub>6</sub>. Additionally, the incorporation of Se and S in Se<sub>2</sub>S<sub>6</sub> improved the conductivity compared to S alone, resulting in reduced polarization and enhanced electrical properties. Consequently, NS-MXene/Se<sub>2</sub>S<sub>6</sub> exhibited excellent cycling stability, high reversible capacity, and reliable performance at high current densities and under extreme conditions, such as high sulfur loading and low electrolyte-to-sulfur ratios. This work presents a simple and effective strategy for designing heteroatom-doped MXene materials, offering promising potential for the development of high-performance, long-lasting Li-S batteries for practical applications.
ISSN:1420-3049

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