Entropy-Change Driven Highly Reversible Sodium Storage for Conversion-Type Sulfide

Jing Zhao, Yu Zhang, Xi Chen, Ge Sun, Xu Yang, Yi Zeng, Ruiyuan Tian, Fei Du

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Transition metal sulfides (TMSs) are reported to be efficient sodium storage anode materials due to their rich redox chemistry and good electronic conductivity features. However, the issues of poor reaction reversibility and cyclability, caused by structure degradation and volume expansion during repeated (de)sodiation processes, have far limited the applicability of these materials. Herein, a high-entropy configuration strategy is reported for Cu4MnFeSnGeS8 anodes for advanced sodium ion batteries. In this high-entropy material, the homogeneously dispersed cations can effectively suppress the continuous coarseness of Sn nanoparticles and maintain valid interface contact between M0 and Na2S, thus achieving highly reversible sodium storage. Moreover, the highly reversible crystalline-phase transformation of high-entropy Cu4MnFeSnGeS8 and highly inherent mechanical stability can effectively relieve the persistently accumulated mechanical stress, thus restraining continuous breakage of the solid electrolyte interphase film and pulverization of the electrode, and improving cycling stability. Furthermore, when coupled with a Na3V2(PO4)3 cathode, the full cell shows a high energy density (264 Wh kg–1), which makes the high-entropy-stabilized sulfide a promising anode candidate for SIBs.

Original languageEnglish
Article number2206531
JournalAdvanced Functional Materials
Volume32
Issue number45
DOIs
StatePublished - 3 Nov 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • entropy stabilization
  • high-entropy sulfides
  • mechanical stability
  • reversible sodium storage

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