Synthesis and characterization of Li2MxMn4−xO8 (M=Co, Fe) as positive active materials for lithium-ion cells

We describe the preparation and the electrochemical properties of Li2MxMn4−xO8, spinel-structured compounds. The results demonstrate that these materials may operate as high-voltage cathodes in new concept lithium-ion batteries. An example of these batteries has been fabricated and successfully tested.