A New Low-Rate Stable Hydrogel Cathode for Aqueous Zn-ion Batteries.

ABSTRACT: Aqueous Zn-ion batteries (ZIBs) are attractive candidates for large-scale energy storage owing to the abundance, low cost, and intrinsic safety of Zn metal. However, their practical application is hindered by poor cycle stability, especially at low current densities, due to cathode dissolution and limited electrochemically active sites (EAS). Herein, a hydrogel-based cathode comprising ammonium vanadate, carbon black, and a Zn-ion-conducting carboxymethyl chitosan-acrylamide hydrogel matrix doped with Zn(ClO₄)₂ is reported. This design establishes a continuous Zn-ion-conducting network, thereby maximizing EAS density throughout the electrode volume. The ZIB with the hydrogel cathode exhibits outstanding cycling stability, with 77% capacity retention after 2000 cycles

SUBMITTER: Rajabi R 

PROVIDER: S-EPMC12703429 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature