Amorphous Manganese Dioxide: A High Capacity Lithium Intercalation Host

摘要

Amorphous manganese dioxide (a-MnO_2) has been synthesized via a room-temperature sol-gel route. The material is a stable intercalation host for lithium and the intercalation capacity is greater than 1.6 mol of Li per mole of MnO_2. The host remains amorphous in the entire intercalation range and the insertion process is reversible. When used as an intercalation electrode, the material stores energy at the level of 1056 m Wh/g. The latter represents an improvement over crystalline manganese oxide materials by factors of two to three.