Amorphous Manganese Dioxide: A High Capacity Lithium Intercalation Host

Amorphous manganese dioxide 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 . 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 . The latter represents an improvement over crystalline manganese oxide materials by factors of two to three.