Antimony Telluride as Bifunctional Host Material for Dendrite-Free Sodium Metal Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 40070312.
- Also identified by DOI 10.1021/acs.nanolett.4c06650.
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Abstract
The development of the sodium metal anode is hampered by uncontrolled Na dendrite growth and unstable solid electrolyte interface (SEI). Herein, Sb<sub>2</sub>Te<sub>3</sub> nanosheets are anchored into the fibers of carbon cloth (CC) to construct Sb<sub>2</sub>Te<sub>3</sub>@CC material as Na metal host for sodium metal batteries (SMBs). The alloying product of Na<sub>3</sub>Sb with strong sodiophilicity serves as a nucleation seed to induce homogeneous Na deposition and boost the formation of a dendrite-free Na metal anode. Meanwhile, the conversion product of Na<sub>2</sub>Te covers the surface of Na metal to form a robust SEI film. Low current density, uniform Na ionic flux, and suppressed volume expansion can be guaranteed by three-dimensional carbon fibers. Therefore, a Na@Sb<sub>2</sub>Te<sub>3</sub>@CC electrode contributes ultrastable cyclic performance for over 1600 h with a low overpotential of 30.5 mV. The assembled Na metal full batteries deliver a high initial energy density of 307.3 Wh kg<sup>-1</sup> and superior cycling stability with an ultralong lifespan of over 2000 cycles.