What does this research mean for the field?

High-entropy telluride (HET) as a host material enables dendrite-free sodium metal deposition and enhances the performance of quasi-solid-state batteries, achieving over 99.5% Coulombic efficiency and a lifespan exceeding 2000 hours. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This work aims to address the challenges faced by sodium metal anodes in quasi-solid-state batteries, focusing on dendrite growth and solid electrolyte interface stability.

February 28, 2026

High-Entropy Telluride as Multifunctional Host Material with Synergistic Conversion-Alloying Chemistry of Dendrite-Free Sodium Metal Anode for Quasi-Solid-State Batteries

Key Points

This work aims to address the challenges faced by sodium metal anodes in quasi-solid-state batteries, focusing on dendrite growth and solid electrolyte interface stability.
Developed a high-entropy telluride material anchored on carbon cloth as a host for sodium metal anodes.
Examined interfacial kinetics and sodiophilicity of the alloying phases present in the material.
Evaluated the performance through Coulombic efficiency, overpotential, initial energy density, and cyclic stability.
Achieved a Coulombic efficiency exceeding 99.5% over 2000 hours in an asymmetric cell.
Demonstrated an ultra-long lifespan of 2000 hours with a low overpotential of 5.8 mV.
Full quasi-solid-state batteries achieved an initial energy density of 367.4 Wh·kg–1 and superior stability over 1500 cycles.

Abstract

The development of sodium metal anodes is hampered by uncontrolled dendritic growth, severe volume variation, and a fragile solid electrolyte interface (SEI). Herein, a high-entropy telluride (Sb1.6Bi0.1Sn0.1Mn0.1Co0.1Te3, HET) anchored onto carbon cloth served as host material (HET@CC) of a Na metal anode for quasi-solid-state batteries. High-entropy composition provides abundant sites for favorable interfacial kinetics, dendrite-free Na metal deposition, and enhanced structure stability. The yielded multiple alloying phases (Na3Sb, Na3Bi, and Na15Sn4) with great sodiophilicity significantly reduce the Na nucleation barrier, the conversion products (Co and Mn) serve as electron-conducting networks to enable uniform charge distribution, and Na2Te contributes to forming a robust SEI. Consequently, Na@HET@CC achieves high Coulombic efficiency exceeding 99.5% over 2000 h in an asymmetric cell and ultralong lifespans of 2000 h with a low overpotential of 5.8 mV. The quasi-solid-state Na metal full batteries deliver a high initial energy density of 367.4 Wh·kg–1 and superior cyclic stability with an ultralong lifetime over 1500 cycles.

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