MIXED CATHODE ACTIVE MATERIAL HAVING IMPROVED POWER CHARACTERISTICS AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

摘要

Provided are a mixed cathode active material having improved power characteristics and a lithium secondary battery including the same. More particularly, the present invention relates to a mixed cathode active material which may reduce the difference in operating voltage with respect to layered-structure lithium transition metal oxide and may consequently minimize power reduction in a transient region by using LFP having a portion of iron (Fe) substituted with other elements, such as manganese (Mn), (LMFP), in order to prevent a rapid voltage drop in the transient region when layered-structure lithium transition metal oxide and olivine-structured lithium oxide (e.g., LFP) are blended, and a lithium secondary battery including the mixed cathode active material.

主权项

1. A mixed cathode active material comprising:
a first cathode active material as lithium transition metal oxide having a layered structure; and a second cathode active material having an olivine structure that is represented by Chemical Formula 2,
LiFe1−xMxMy′XO4   [Chemical Formula 2] where M is one, or two or more elements among elements that belong to groups 7 and 9 to 12, essentially comprises manganese (Mn); M′ is one, or two or more transition metal elements among transition metal elements, and essentially comprises Mn; X is one or more selected from the group consisting of phosphorous (P), silicon (Si), sulfur (S), arsenic (As), and antimony (Sb); 0