Facile synthesis of porous LiMn2O4 micro-/nano-hollow spheres with extremely excellent cycle stability as cathode of lithium-ion batteries

Abstract

In present work, the porous LiMn2O4 micro-/nano-hollow spheres are directly prepared from the globe precursor MnCO3 obtained via a facile precipitation route without any intermediate and ethanol. X-ray diffraction and scanning electron microscopy results indicate that the as-synthesized porous LiMn2O4 micro-/nano-hollow spheres are composed of nanometer-sized primary particles. Charge–discharge tests, cyclic voltammetry, and electrochemical impedance spectra show that the obtained LiMn2O4 delivered higher reversible capacity, extremely excellent cycle stability, superior kinetic properties, and rate capacities. Specially, there are nearly no any capacity loss after 200 cycles, and the coulombic efficient is nearly close to 100%, which are attributed the unique porous micro-/nano-hollow structure and a better crystallinity.