Ferroelectric-Enhanced cathode kinetics toward High-Performance aqueous Zinc-Ion batteries

Rechargeable aqueous zinc ion batteries (AZIBs) offer promising potential for large-scale energy storage systems due to their high affordability and safety. However, their practical applications are hindered by the undesired rate capability and cycling stability of the used cathode, attributed to sluggish ions kinetics during charge-discharge process. Herein, we propose an electric field balancing strategy to regulate the electrolyte ions behavior by constructing a ferroelectric interface on the cathode surface using a prototypical of MnO₂-based cathode. An appropriate thickness coating of ferroelectric materials coating (i.e., β-PVDF) on the MnO₂ surface is theoretically and experimentally demonstrated to enhance the ion kinetics due to the optimized electrical distribution during electrochemical operations. Further comprehensive electrochemical mechanism studies reveal that the ferroelectric interface on the MnO₂@β-PVDF not only promotes the diffusion of Zn²⁺ but also reduces the electrochemical overpotential (17.6 mV), resulting in improved electrochemical reversibility and capacity performance. The resultant MnO₂@β-PVDF cathode exhibits the highest capacity of 277.6 mAh g^-1 (at 0.1 A g^-1) and capacity retention of 68.6% after 120 cycles, surpassing both the pristine MnO₂ and non-ferroelectric materials coated MnO₂ electrodes. This success presents a new approach to enhance the overall electrochemical performance of the cathodes for the practical application of AZIBs.