Processing And Properties of Amorphous Manganese Dioxide Formed By SOl-Gel PRocedures

摘要

Sol-gel derived amorphous manganese dioxide(a-MNO_2) showed extremely high reversible lithium intercalation capacity. The composition and structure of the material were modified by heating at different temperatures. Cycling performance of the modified samples suggests that lowering the water ocntent in the mateial is beeficial, while introducting crystalinity is detrimental,to its cyclability. A novel double-solvent-exchange process was tried for the processing of the material. Preliminary results indicated significant improvement in the reversibility of hte insertion/release cycles.