Dendrite-free and corrosion-resistant sodium metal anode for enhanced sodium batteries

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

Because of the high theoretical special capacity, low cost, and low redox potential of sodium (Na) metal, it has been regarded as an ultimate anode for high-energy–density Na metal batteries. Nevertheless, Na metal suffers from dendrite formation due to a non-uniform Na deposition and unstable interface between Na and electrolyte, resulting in a short circuit and low Coulombic efficiency. Herein, a Zn coating on the Na metal surface as a nucleation and protective layer was fabricated through an in-situ chemical method involving a simple dripping ZnCl2-tetrahydrofuran solution. The Zn coating endows Na with corrosion-resistance in organic ether-based electrolytes and a polysulfide solution. More importantly, Zn coating on Na enables a low nucleation overpotential due to its sodiophilic property, giving rise to a uniform Na deposition. Consequently, Zn-coated Na showed a stable cycling over 1200 h at 1 mA cm−2 with a high capacity of 2 mA h cm−2 in symmetric cells. When combined with Na3V2(PO4)3 cathode, full cells with Zn-coated Na demonstrated a good cycling stability and rate capability. This work presents a simple, effective and promising approach of designing a dendrite-free and corrosion-resistant Na metal anode for enhanced Na metal batteries.

Details

OriginalspracheEnglisch
Aufsatznummer154168
FachzeitschriftApplied surface science : a journal devoted to applied physics and chemistry of surfaces and interfaces
Jahrgang600
PublikationsstatusVeröffentlicht - 30 Okt. 2022
Peer-Review-StatusJa

Schlagworte

Schlagwörter

  • Nucleation layer, Sodium dendrite, Sodium metal anode, Sodium metal batteries, Zn coating