g-MnO2 compounds used in rechargeable lithium batteries are usually prepared by anodic electrodeposition from a boiling MnSO4 solution and a subsequent thermal treatment. The structure of these compounds is made of an intergrowth of Ramsdellite and Pyrolusite blocks and of microtwinning defects. In order to obtain g-MnO2 compounds with a wide range of physico-chemical and structural characteristics, various preparation conditions were used and some industrial samples were subjected to thermal treatments.

It has been shown that the physico-chemical and structural parameters of the g-MnO₂ compounds are related to the synthesis conditions (electrodeposition and subsequent thermal treatment). Correlations have been established as well with the performances in lithium batteries (reversible capacity and cycling behavior).