High performance all-solid-state Li-Se battery based on selenium loaded on Ti₃C₂ MXene cathode

Abstract

Selenium has high theoretical volumetric capacity of 3253 mAh cm⁻³ and acceptable electronic conductivity of 1 × 10⁻⁵ S m⁻¹, which is considered as a potential alternative to sulfur cathode for all-solid-state rechargeable batteries with high energy density. However, the development of all-solid-state Li-Se batteries (ASSLSBs) are hindered by sluggish kinetics and poor cycling life. In this work, trigonal Se nanocrystallines are homogenously distributed in the interspace and on the surface of MXene layers (denoted as Se@MXene composite) by a novel melt-diffusion method. ASSLSBs based on this Se@MXene composite cathode exhibit large specific capacity of 632 mAh g⁻¹ at 0.05 A g⁻¹, high-rate capability over 4 A g⁻¹, and excellent cycling stability over 300 cycles at 1 A g⁻¹. The ex-situ analytical techniques demonstrate that the excellent electrochemical performance of Se@MXene cathode largely arises from structural stability with the assistance of conductive MXene and reversible redox behavior between Li₂Se and Se during the repeating charge/discharge process. Our study points out the potential of material design of Se cathode based on conducting 2D materials with good electrochemical behavior, which may accelerate the practicability of ASSLSBs.

Keywords

Li-Se batteries / Solid-state electrolyte / Lithium argyrodite / MXene / Composite

Declaration of competing interest

The authors declare no competing financial interest.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (52272224, 51902188), Innovation Capacity Improvement Project of Small and Medium-Sized Technology-Based Enterprise of Shandong Province (2021TSGC1149), and Youth Innovation Team Project of Shandong Provincial Education Department (10000082295015).

Appendix A. Supplementary data

Supplementary data to this article can be found online at https://doi.org/10.1016/j.gerr.2024.100058.

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