Abstract

γ-MnO2 compounds (EMD: Electrolytic Manganese Dioxides, CMD: Chemical Manganese Dioxides, and HTMD: heat Treated Manganese Dioxides) are positive electrode materials of both rechargeable alkaline and lithium batteries. Their structure consists of a random inlergrovvth of blocks of the pyrolusite structure (De Wolff defects with a Pr rate) within the ramsdellile structure, and contains microtwinning defects(with Mt rate). Consequently, their structural characterization by diffraction techniques is complex and requires simulation of the pou der patterns [ 1 ].

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