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