No abstract

No abstract

Herein, we present an ultrafast microwave approach for fabricating MoS2/MoO2@CNT nanocomposites toward supercapacitor electrodes with excellent cycle stability.

Extensive studies on the trirutile Li0.5FeF3 phase have been commissioned in the context of Li-Fe-F system for Li-ion batteries. However, progress in electrochemical and structural studies have been greatly encumbered by the low electrochemical reactivity of this material. In order to advance this class of materials, a comprehensive study into the mechanisms of this phase is necessary. Therefore, herein, we report for the first-time overall reaction mechanisms of the ordered trirutile Li0.5FeF3 at elevated temperatures of 90 °C with the aid of a thermally stable ionic liquid electrolyte. The ordered trirutile Li0.5FeF3 is prepared by highenergy ball milling combined with heat treatment followed by electrochemical tests, X-ray diffraction, and X-ray absorption spectroscopic analyses. Our results reveal that a reversible topotactic Li + extraction/insertion from/into the trirutile structure occurs in a twophase reaction with a minor volume change (1.09 % between Li0.5FeF3 and Li0.11FeF3) in the voltage range of 3.2−4.3 V. Extension of the lower cut-off voltage to 2.5 V results in a conversion reaction to LiF and rutile FeF2 during discharging. The subsequent charge triggers the formation of the Li/Fe disordered trirutile structure at 4.3 V without showing the reconversion from LiF and rutile FeF2 to the ordered trirutile Li0.5FeF3 or FeF3.

No abstract

No abstract

No abstract

CuCo2O4@CuCo2O4 hierarchical nanowire arrays were fabricated directly on Ni foam via a two-step method. The binder-free electrode displayed high electrochemical performance with excellent cycling stability.