Iodine-Doped Sodium Vanadate Cathode for Improved Zn Ion Diffusion Kinetics.

ABSTRACT: The electrostatic interaction between zinc ions and the host structure significantly limits the practicality of vanadium-based cathodes in aqueous zinc-ion batteries (AZIBs). Herein, an anion doping strategy is demonstrated to mitigate electrostatic resistance and steric hindrance during zinc ion insertion by incorporating iodine atoms into the lattice of the cathode material, Na₂V₆O₁₆·3H₂O. Iodine doping reduces the adsorption energy at the most stable site, thereby weakening the Zn²⁺-host interaction and lowering the Zn²⁺ diffusion energy barrier, resulting in a one-order-of-magnitude increase in the diffusion coefficient. Moreover, the large atomic size of iodine expands the host lattice, creating ample space for increase

SUBMITTER: Hu X 

PROVIDER: S-EPMC12631527 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature