Breakthrough in Sodium Metal Anodes for High-Energy-Density Rechargeable Batteries

Strategic Insights -

Researchers from the Guangdong University of Technology have developed a novel strategy to stabilize solid electrolyte interphase (SEI) and enhance the performance of sodium metal anodes (SMAs) in sodium metal batteries. The new approach uses nitrogen-doped carbon nanosheets decorated with ZnSe nanoparticles as the SMA host, which efficiently facilitates a highly reversible Na plating/stripping behavior and stabilizes the SEI. This research has significant implications for the development of high-energy-density rechargeable batteries.

Key Takeaways:

  • The new SMA host material, ZnSe@NC, is designed to efficiently facilitate a highly reversible Na plating/stripping behavior while stabilizing the SEI.
  • ZnSe nanoparticles undergo in situ reactions with Na to generate NaZn alloy with excellent sodiophilicity and a SEI enriched with inorganic NaSe components.
  • The in situ formed NaSe increases the inorganic SEI fraction, stabilizing the interface and enhancing both ionic conductivity and mechanical resilience.
  • The as-designed ZnSe@NC electrode stably cycles for over 200 times at 1.0 mA cm with an average Coulombic efficiency of 99.3%.
  • The assembled symmetric cells demonstrate excellent performances with low nucleation overpotential and long cycle life of 1000 h at 2.0 mA cm under a 40% depth of discharge.
  • The SMA host is demonstrated to be practical by cycling Na@ZnSe@NC||NaV(PO) full cells for over 200 cycles at 2 C, achieving a high capacity retention rate of 97.
  • This research has been peer-reviewed and published in the journal ACS Applied Materials & Interfaces.

Statistics:

  • The average Coulombic efficiency of the ZnSe@NC electrode is 99.3% after cycling for over 200 times.
  • The assembled symmetric cells demonstrate long cycle life of 1000 h at 2.0 mA cm under a 40% depth of discharge.
  • The capacity retention rate of the Na@ZnSe@NC||NaV(PO) full cells is 97 after cycling for over 200 cycles at 2 C.

Sources:

  • NewsRx. Study Data from Guangdong University of Technology Update Understanding of Nanoparticles (A Synergistic Strategy for Highly Reversible Sodium Metal Anodes by Using ZnSe Nanoparticles-Decorated N-Doped Carbon Nanosheets as a Host). Nanotechnology Weekly. November 3, 2025; p 2325.
  • Tangchao Xie, et al. A Synergistic Strategy for Highly Reversible Sodium Metal Anodes by Using ZnSe Nanoparticles-Decorated N-Doped Carbon Nanosheets as a Host. ACS Applied Materials & Interfaces, 2025.