Effect of MnO₂ Morphology on Kinetics and Stability in Zinc-Ion Batteries

Abstract

Research on zinc-ion batteries (ZIBs) with manganese-based cathodes has been severely hindered by their poor cycle stability. This study explores the fundamental parameters that affect the cycle stability of battery systems from a structural stability perspective. MnO2 electrodes with different classical morphologies and sizes were synthesized via a temperature-controlled coprecipitation strategy. The effects of the morphology and size of the MnO2 on the overall electrical properties and kinetics of ZIBs were analyzed and compared. The one-dimensional nanofibrous α-MnO2 produced using this method exhibited the most stable nanostructure with a favorable aspect ratio, which resulted in faster chemical kinetics. A more uniform particle distribution and better aspect ratios not only enabled a faster ion migration rate but also affected the remolding of the anode morphology. After 2000 cycles at a high current density of 1 A g–1, the material maintained an excellent discharge-specific capacity, highlighting it as a promising electrode material for ZIBs. The construction of nanoenergy materials with controllable morphologies and sizes will significantly advance battery applications.

Vanadate‐Based Fibrous Electrode Materials for High Performance Aqueous Zinc Ion Batteries

“…Aqueous rechargeable batteries are emerging as exciting candidates owing to their improved safety, inexpensiveness, non-pollution characteristics, and good ionic conductivity compared with the organic electrolytes-based counterparts. [5] So far, a variety of aqueous rechargeable batteries have been studied among which zinc-ion batteries (AZIBs) have become much attractive as a result of the high theoretical specific capacity (820 mAh g −1 ) and volumetric capacity (5851 mAh cm −3 ), [6][7][8][9][10] as well as the low redox potential of the Zn anode. [11] In addition, zinc is highly abundant in nature, which could decrease the cost of mass production.…”

“…So far, a variety of aqueous rechargeable batteries have been studied among which zinc‐ion batteries (AZIBs) have become much attractive as a result of the high theoretical specific capacity (820 mAh g −1 ) and volumetric capacity (5851 mAh cm −3 ), [ 6 , 7 , 8 , 9 , 10 ] as well as the low redox potential of the Zn anode. [ 11 ] In addition, zinc is highly abundant in nature, which could decrease the cost of mass production.…”

Controllable Synthesis of Different MnO2 Phases by a Precipitation Method for Effective Ozone Decomposition

“…Due to its easily tuned physical and chemical properties, manganese dioxide (MnO 2 ) has been one of the research focuses in a range of applications, such as electrochemical materials for battery and supercapacitor, and air pollutants degradation catalysts for carbon monoxide (CO), ozone (O 3 ), etc. The basic unit in MnO 2 is six-coordinated [MnO 6 ] octahedra, which constructs different crystallographic phases, such as α-MnO 2 , β-MnO 2 , γ-MnO 2 , δ-MnO 2 , etc., depending on the varied interlinking formats. − Different phases are preferred in different applications. − For example, Devaraj and Munichandraiah found that the δ-and α-phases have higher specific capacitance than other phases, and similar trends were reported for the CO oxidation by Liang et al However, the γ-MnO 2 has higher O 3 catalytic activity than α-MnO 2 as reported by Li et al Therefore, the structure–property relationships should be further investigated for MnO 2 in varied applications.…”