Electrochemical Properties of ZnO-Coated LiMn2O4 by Hydrothermal Method

Abstract

The electrochemical and structural properties of LiMn2O4 have been studied extensively as the cathode for lithium rechargeable batteries because it has advantages such as low cost, low toxicity. It is well known that the spinel LiMn2O4 electrode shows good stability during cycling at room temperature, but poor cycling behavior at elevated temperature. e.g., 50-80℃, which prevents its wider use as cathode materials for lithium secondary batteries. Although the origin of the poor cycling performance has not been fully understood, several possible mechanisms were suggested; Jahn-Teller distortion, Mn dissolution at elevated temperature originated from the Mn3+/4+ redox, change in crystal lattice arrangement with cycling, and so on. To overcome this problem, many research groups have studied for improving the electrochemical performance is surface modification of the cathode materials with electrochemically inactive metal ions. In this work, we report the electrochemical characteristics of ZnO-coated LiMn2O4 been prepared by Hydrothermal method electrodes in the 4V region at high temperature.