A binder‐free bivalent manganese oxide cathode elective structure with high activity in aqueous zinc ion batteries. (17th March 2022)

• Record Type: Journal Article
• Authors: Ho, Van‐Chuong; Oh, Si Hyoung; Mun, Junyoung
• Is Part Of: International journal of energy research. Volume 46:Number 7(2022)
• Page Start: 9720
• Page End: 9732
• Publication Date: 2022-03-17
• Subjects: binder‐free electrode -- elective structure -- high electrochemical activity -- high‐energy density -- Mn5O8 cathode -- zinc aqueous battery; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7841
• Languages: English
• ISSNs: 0363-907X

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 Mn5 O8 deposited on stainless steel as a cathode of AZIBs. Mn5 O8 nanoparticles with a layered structure, which provide a facile pathway for Zn 2+ 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 Mn5 O8 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 Zn 2+ 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 Mn5 O8 particles provide a large interface area and facilitate more zinc ions for diffusion, leading to improved ionic current and specific capacity. Abstract : Manganese‐based oxides are being actively studied as cathode materials for AZIBs because of their high capacity, cost‐effectiveness, safety, and eco‐friendliness. Herein, we propose the first bivalent manganese oxide with the chemical composition of Mn5 O8 deposited on stainless steel as a cathode of AZIBs. Mn5 O8 nanoparticles with a layered structure, which provide a facile pathway for Zn 2+ ion transport and diffusion, were directly deposited on a three‐dimensional stainless steel mesh via a hydrothermal method using different temperatures. The Mn5 O8 cathode material exhibited a high specific capacity of 254.98 mAh g −1, and simultaneously demonstrated satisfactory reversible charge/discharge and high rate performance. The Zn 2+ 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. The smaller and homogeneous Mn5 O8 particles provide a large interface area and facilitate more zinc ions for diffusion, leading to improved ionic current and specific capacity.