High-Entropy Telluride as Multifunctional Host Material with Synergistic Conversion-Alloying Chemistry of Dendrite-Free Sodium Metal Anode for Quasi-Solid-State Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 41741404.
- Also identified by DOI 10.1021/acs.nanolett.5c05937.
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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 (Sb<sub>1.6</sub>Bi<sub>0.1</sub>Sn<sub>0.1</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>Te<sub>3</sub>, 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 (Na<sub>3</sub>Sb, Na<sub>3</sub>Bi, and Na<sub>15</sub>Sn<sub>4</sub>) 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 Na<sub>2</sub>Te 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<sup>-1</sup> and superior cyclic stability with an ultralong lifetime over 1500 cycles.