摘要：Herein, the formation and electrochemical performance of a novel binder-free turbostratic stacked/ well-ordered stacked δ-MnO 2 -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-MnO 2 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-MnO 2 sheets was observed. Annealing induces the rearrangement of δ-MnO 2 sheets resulting in the transformation from turbostratic stacking to a well-ordered stacking of [Formula: see text]-MnO 2 sheets, as indicated by the selected area electron diffraction (SAED) hexagonal single crystal pattern. Besides, the formation of the well-ordered stacking of [Formula: see text]-MnO 2 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-MnO 2 -C fiber composite with a well-ordered stacking of δ-MnO 2 sheets. This study also demonstrated comparable electrochemical performance between the turbostratic [Formula: see text]-MnO 2 sheets and the well-ordered stacked δ-MnO 2 sheets.
