Nanoscale ion intermixing induced activation of Fe2O3/MnO2 composites for application in lithium ion batteries

Abstract

Herein, we demonstrate a facile method to prepare hollow-structured oxygen-vacancy-rich Fe₂O₃/MnO₂ nanorods. Our results show that oxygen vacancies are induced by nanoscale ion intermixing between Fe and Mn ions during the annealing process. Owing to their unique core–shell hollow nanostructure and the presence of oxygen vacancies, the Fe₂O₃/MnO₂ nanorods show excellent electrochemical performances as an anode material for lithium ion batteries and a reversible capacity higher than 700 mA h g⁻¹ after 2000 cycles.