POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY AND LITHIUM ION SECONDARY BATTERY INCLUDING POSITIVE ELECTRODE ACTIVE MATERIAL
Provided is a positive electrode active material for a lithium ion secondary battery including layer-structured lithium metal oxide expressed by the following Chemical Formula 1 and at least one selected from the group consisting of spinel-structured lithium metal oxides and olivine-structured lithium metal oxides. x LiMO 2 ·(1− x )Li 2 MnO 3 (1) (where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<x<1.)
1 . A positive electrode active material for a lithium ion secondary battery comprising:
layer-structured lithium metal oxide expressed by the following Chemical Formula (1); and
at least one selected from the group consisting of spinel-structured lithium metal oxides and olivine-structured lithium metal oxides,
x LiMO 2 ·(1 −x )Li 2 MnO 3 (1)
where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<x<1.
2 . The positive electrode active material for a lithium ion secondary battery as claimed in claim 1 , wherein the spinel-structured lithium metal oxide is LiMn 2 O 4 .
3 . The positive electrode active material for a lithium ion secondary battery as claimed in claim 1 , wherein the olivine-structured lithium metal oxide is one or more selected from the group consisting of LiFePO 4 , LiMnPO 4 , and LiFe x Mn (1−x) PO 4 (0<x<1).
4 . The positive electrode active material for a lithium ion secondary battery as claimed in claim 1 , wherein a total content of the spinel-structured lithium metal oxide and the olivine-structured lithium metal oxide is in a range of 10 wt % to 30 wt % of the entire positive electrode active material.
5 . A positive electrode comprising the positive electrode active material of claim 1 .
6 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 1 , an electrolyte, and a negative electrode.
7 . A positive electrode comprising the positive electrode active material of claim 2 .
8 . A positive electrode comprising the positive electrode active material of claim 3 .
9 . A positive electrode comprising the positive electrode active material of claim 4 .
10 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 2 , an electrolyte, and a negative electrode.
11 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 3 , an electrolyte, and a negative electrode.
12 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 4 , an electrolyte, and a negative electrode.