Synergistic chemical and electrochemical strategy for high-performance Zn//MnO_(2) batteries

摘要

Aqueous rechargeable Zn//MnO_(2)batteries have been considered as the promising candidate for future energy storage system due to their economic and environmental merits.However,the high-performance Zn//MnO_(2)batteries are plagued by poor sluggish reaction kinetics and capacity degradation due to the strong electrostatic interactions and complicated reaction process.Herein,the synergistic effect of atom defects engineering and phase transformation mechanism is confirmed as the effective strategy to enhance ion/charge transfer kinetics and structural stability.Defects gradient controlling and electrochemically induced phase transformation from spinel to layered structure render the aqueous Zn//λ-MnO_(2)system delivers a high discharge capacity of 285 m Ah/g and capacity retention of 81%after 500 cycles.