g-Li_xMnO₂ compounds can be prepared either by solid state reaction or electrochemically. The solid state preparation consists of heating in air, at 300-400°C, a mixture containing
g-MnO₂ + LiNO₃ (or LiOH); the resulting material is a phase mixture called CDMO (Composite Dimensional Manganese Oxide). The electrochemical preparation involves the discharge of a Li / Li⁺ electrolyte / g-MnO₂ battery down to 2V.

A detailed characterization of the lithium intercalation process (mechanism, kinetics parameters) into g-MnO₂ and g-Li_xMnO₂ compounds is presented. Different techniques have been used including: electrochemistry (cyclic voltammetry, chrono-amperometry, galvanostatic cycling), simulation of X-ray diffraction patterns and HREM.