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

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. (C) The Electrochemical Society of Japan, All rights reserved.