Synergistic chemical and electrochemical strategy for high-performance Zn//MnO2 batteries

Aqueous rechargeable Zn//MnO2 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//MnO2 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 en-hance ion/charge transfer kinetics and structural stability. Defects gradient controlling and electrochem-ically induced phase transformation from spinel to layered structure render the aqueous Zn//A-MnO2 system delivers a high discharge capacity of 285 mAh/g and capacity retention of 81% after 500 cycles. (c) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.