Abstract
Rechargeable multivalent ion battery such as Mg-ion battery is considered as a candidate for high-density battery technology because of its high volumetric capacity and low tendency to form dendrites. Development of cathode materials for Mg-ion batteries requires good understanding of the intercalation and adsorption processes of Mg2+ ions into and on the host materials. We observed recently that nanostructure is beneficial for the development of Mg2+ cathode materials with high capacity. In this work, we describe the preparation of flower-like three-dimensional (3D) nanostructures of birnessite MnO2 through an electrochemical conversion reaction from γ-MnS. This 3D birnessite MnO2 exhibited a total capacity of ~360 mAh/g in aqueous electrolyte for the initial cycle. We further characterized the insertion of Mg2+ ions in the atomic layers of MnO2 nanoflowers using scanning transmission electron microscopy (STEM) technique, revealing the energy storage mechanism of Mg2+ ions in 3D, ion-accessible MnO2 nanostructures.
Original language | English (US) |
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Article number | 107696 |
Journal | Nano Energy |
Volume | 102 |
DOIs | |
State | Published - Nov 2022 |
Keywords
- Aqueous battery
- Birnessite
- In-situ conversion
- Intercalation
- Mg-ion insertion
- MnO
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- Electrical and Electronic Engineering