Understanding Zn2+ Charge-Storage Mechanism in Vanadium-based Na+ Superionic Conductor for Zn Batteries

Schematic of the potential-dependent crystal structures associated with the charge and discharge cycle of Na3V2(PO4)3 determined from X-ray diffraction.

Scientific Achievement

Elucidated the complex, multivalent charge-storage behavior of Na3V2(PO4)3 with Na+ and Zn2+ insertion.

Significance and Impact

Reveals the potential of utilizing other polyanionic frameworks for multivalent charge storage, including other divalent ions such as Mg2+ and Ca2+.


  • X-ray diffraction revealed a reversible, quasi-two-stage Na+ and Zn2+ insertion mechanism with Zn2+ forming a Zn0.25NaV2(PO4)3 structure during discharge
  • Stable cycling across multiple charge/discharge cycles demonstrates the electrochemical reversibility of the structure
  • Oxidation-reduction reactions of the electrochemical process were verified by X-ray absorption spectroscopy

Download this highlight 

DOI: 10.1021/acs.chemmater.0c00004

Latest Updates

See All