Lithium-manganese-tin oxide cathode active material and lithium secondary cell using the same

摘要

A cathode thin film for a lithium secondary cell, which uses a cathode active material substituting Sn for Mn in lithium manganese oxide, has a high discharge capacity and an improved cycle property.
The present invention relates to a cathode active material comprising a lithium-manganese-tin oxide of formula: LiSn x/2 Mn 2-x O 4 wherein 0 < x ‰¤ 0.05.