A binder‐free bivalent manganese oxide cathode elective structure with high activity in aqueous zinc ion batteries

Abstract

Summary Manganese‐based oxides are being actively studied as cathode materials for rechargeable aqueous zinc ion batteries (AZIBs) because of their high capacity, cost‐effectiveness, safety, and eco‐friendliness. Herein, we propose a binder‐free electrode of bivalent manganese oxide with the chemical composition of Mn5O8 deposited on stainless steel as a cathode of AZIBs. Mn5O8 nanoparticles with a layered structure, which provide a facile pathway for Zn2+ ion transport and diffusion, were directly deposited on a three‐dimensional stainless steel mesh via a hydrothermal method using different temperatures. The structures of the active materials in the cathode were characterized by X‐ray diffraction, high‐resolution transmission electron microscopy, X‐ray photoelectron spectroscopy, and field‐emission scanning electron microscopy. The Mn5O8 cathode materials exhibited a high specific capacity of 254.98 mAh g−1, and simultaneously demonstrated satisfactory reversible charge/discharge and high rate performance. The Zn2+ insertion/extraction behaviors were studied in detail by cyclic voltammetry. In addition, factors that influence the electrochemical performance of the cathode, such as the phase structure and particle size of manganese dioxide, are discussed. Smaller and homogeneous Mn5O8 particles provide a large interface area and facilitate more zinc ions for diffusion, leading to improved ionic current and specific capacity.

2D VS2@MXene Based Zinc Ion Batteries with SPANI‐Contained Electrolyte Enables Dendrite‐Free Anode for Stable Cycling

“…Thus VS 2 @MXene||ZnSO 4 +SPANI||Zn devices exhibited excellent cycling stability. As provided in Figure 3f after 5000 cycles at 5 A g −1 , [ 50 ] the capacity retention of the VS 2 @MXene||ZnSO 4 +SPANI||Zn was 96% with a nearly unchanged Columbic efficiency, while the VS 2 @MXene||ZnSO 4 ||Zn only remains 76% of its initial capacity. In addition, by comparison with the XRD patterns (Figure S7, Supporting Information), cyclic voltammetry (CV) curves (Figure S8, Supporting Information) between the cycled VS 2 @MXene and initial VS 2 @MXene in the VS 2 @MXene||ZnSO 4 +SPANI||Zn, the crystalline phase and the electrochemistry of the VS 2 @MXene are unchanged.…”

Coral-like carbon skeleton for aqueous zinc-ion batteries MnO2 cathode material

“…In addition, portable mobile electronic devices and electric vehicle devices have entered people's lives, so energy storage devices have higher requirements. In recent years, various rechargeable aqueous batteries have attracted great attention in the application of energy storage [3][4][5][6][7][8][9][10][11][12][13][14][15]. Lithium-ion batteries are widely used in various elds due to their advantages such as high energy density and extremely wide voltage window, but also suffer from the low security, high price, limited resources, etc, which limit their development in large-scale energy storage applications [3][4][5][6][7][8].…”

“…Prussian blue analogue has a lower capacity. In comparison, MnO 2 has a more appropriate theoretical speci c capacity and conforms to the concept of environmentally friendly, safe and environmental protection, therefore, it has become the best choice at present as the cathode material for AZIBs [4,[8][9][10][11][12][13]15]. MnO 2 is characterized by α-MnO 2 , β-MnO 2 , γ-MnO 2 , δ-MnO 2 , etc.…”

Hierarchically Porous Ferroelectric Layer with the Aligned Dipole Moment for a High-Performance Aqueous Zn Metal Battery

“…Accordingly, rechargeable aqueous Zn metal batteries (AZMBs) are receiving increasing attention from the battery community. In addition, metallic Zn has other benefits: low cost, environmental benignity, and compatibility with slightly acidic or near-neutral aqueous electrolytes (pH close to 7). − It also accommodates various cathode combinations, such as MnO 2 , V 2 O 5 , and I 2 . − However, metallic Zn suffers from dendrite growth, parasitic side reactions (represented by the hydrogen evolution reaction, HER), corrosion, and the formation of unfavorable byproducts, which all jointly impair the sustainable and reliable operation of AZMBs. − …”