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- Title
Annealing induced a well-ordered single crystal δ-MnO<sub>2</sub> and its electrochemical performance in zinc-ion battery.
- Authors
Corpuz, Ryan Dula; De Juan, Lyn Marie Z.; Praserthdam, Supareak; Pornprasertsuk, Rojana; Yonezawa, Tetsu; Nguyen, Mai Thanh; Kheawhom, Soorathep
- Abstract
Herein, the formation and electrochemical performance of a novel binder-free turbostratic stacked/ well-ordered stacked δ-MnO2-carbon fiber composite cathodes in deep eutectic solvent (DES) based zinc-ion battery (ZIB) is reported. Results of morphological, elemental, and structural analyses revealed directly grown and interconnected δ-MnO2 crumpled nanosheets on a carbon fiber substrate. Moreover, an improvement via a simple annealing strategy in the stacking, surface area and conductivity of the δ-MnO2 sheets was observed. Annealing induces the rearrangement of δ-MnO2 sheets resulting in the transformation from turbostratic stacking to a well-ordered stacking of δ -MnO2 sheets, as indicated by the selected area electron diffraction (SAED) hexagonal single crystal pattern. Besides, the formation of the well-ordered stacking of δ -MnO2 sheets exhibited improved electrochemical performance and cyclability, as cathode material for ZIB. The novel strategy described in this study is an essential step for the development of binder-free δ-MnO2-C fiber composite with a well-ordered stacking of δ-MnO2 sheets. This study also demonstrated comparable electrochemical performance between the turbostratic δ -MnO2 sheets and the well-ordered stacked δ-MnO2 sheets.
- Subjects
SINGLE crystals; MANGANESE oxides; ZINC ions; STORAGE batteries; CARBON fibers
- Publication
Scientific Reports, 2019, Vol 9, Issue 1, pN.PAG
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-019-51692-x