X-ray Diffraction Characterization and Battery Performances of Fiber-type Li-Mn-O Electrode for Li-ion Battery

Abstract

A fiber-type Li-Mn-O electrode was developed for use as the positive electrode of Li-ion batteries. For the electrode preparation process, a Mn₃O₄ layer was formed on a carbon fiber by electrodeposition, and then the Mn₃O₄ plated fiber was hydrothermally treated in a LiOH aqueous solution. A structural analysis based on the synchrotron X-ray diffraction pattern indicated that the hydrothermally-treated sample contains 70 wt% orthorhombic LiMnO₂ phases in addition to the 15 wt% cubic LiMn₂O₄ ones. After cycling, the electrode consisted of 78 wt% LiMn₂O₄ and 6 wt% LiMnO₂ phases, indicating that the LiMnO₂ phases were transformed into the LiMn₂O₄ ones during the cycling.