Chemistry and Electrochemistry of Low-Temperature Manganese Oxides as Lithium Intercalation Compounds

Abstract

The synthesis of lithiated manganese oxides, , and lithiated mixed manganese cobalt oxides, , obtained via a sol‐gel process combined with an ion‐exchange reaction is reported. X‐ray powder diffraction patterns reveal that these compounds exhibit a tetragonal symmetry. These tetragonal phases present attractive properties as rechargeable cathode materials for secondary lithium batteries. During cycling experiments performed at discharge‐charge rates of C/20, a stabilization of the specific capacity around (0.6 Li per mol) occurs after the 40th cycle for the best compound obtained with an optimal composition of 15% in cobalt ions, . © 2000 The Electrochemical Society. All rights reserved.