A Review of Research Progress on Manganese Dioxide Cathode Materials for Aqueous Zinc Ion Batteries

• 1、College of chemistry and chemical engeering, chongqing university

Abstract：With the aggravation of the fossil energy crisis and the advancement of the "dual-carbon" goal, the development of intrinsically safe, low-cost, and high-energy-density energy storage technologies has become a global research hotspot. Aqueous zinc-manganese batteries have shown unique advantages in large-scale energy storage due to the use of neutral electrolyte and high abundance electrode materials, but the low intrinsic conductivity of its anode material manganese dioxide, Jahn-Teller aberration-induced structural collapse and slow ion diffusion kinetics have severely restricted the cycle life and multiplication performance of the batteries. To address these problems, researchers have proposed modification strategies such as material composite, cation doping, and oxygen vacancy defects. In this paper, starting from the energy storage mechanism of aqueous zinc-manganese batteries, we systematically review the crystal structure properties, defect causes and modification strategies of manganese dioxide, and intend to provide theoretical guidance for the development of high-performance zinc-manganese batteries, so as to promote the practicalization of this system in the fields of grid energy storage and wearable devices.

Keywords： Applied electrochemistry Aqueous zinc-manganese batteries Manganese dioxide Composites Cation doping Oxygen vacancy defects