POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, METHOD OF PREPARING POSITIVE ELECTRODE ACTIVE MATERIAL AND LITHIUM ION SECONDARY BATTERY INCLUDING POSITIVE ELECTRODE ACTIVE MATERIAL
Provided is a positive electrode active material for a lithium ion secondary battery expressed by the following Chemical Formula 1 and containing antimony. y Li 2 MnO 3 -(1 −y )LiM (1-x) Sb x O 2 (1) (where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<x<1 and 0<y<1)
1 . A positive electrode active material for a lithium ion secondary battery expressed by the following Chemical Formula I and comprising antimony,
y Li 2 MnO 3 -(1 −y )LiM (1-x) Sb x O 2 (1)
where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<x<1 and 0<y<1.
2 . The positive electrode active material for a lithium ion secondary battery as claimed in claim 1 , wherein a content of antimony is in a range of 0.1 mol % to 2 mol % based on the entire positive electrode active material.
3 . A method of preparing the positive electrode active material for a lithium ion secondary battery described in claim 1 , the method comprising:
diluting an antimony-containing compound with alcohol;
adding yLi 2 MnO 3 -(1−y)LiMO 2 (where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<y<1) to the obtained diluted antimony-containing compound solution and then stirring;
heating the solution after completion of the stirring to evaporate alcohol; and
performing a heat treatment.
4 . The method as claimed in claim 3 , wherein the antimony-containing compound is antimony oxide.
5 . The method as claimed in claim 3 , wherein yLi 2 MnO 3 -(1−y)LiMO 2 is added to allow a content of antimony to be included in a range of 0.1 mol % to 2 mol %.
6 . The method as claimed in claim 3 , wherein the heat treatment is performed at a temperature in a range of 500° C. to 750° C. for 3 hours to 10 hours.
7 . A positive electrode comprising the positive electrode active material of claim 1 .
8 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 1 , an electrolyte, and a negative electrode.
9 . A method of preparing the positive electrode active material for a lithium ion secondary battery described in claim 2 , the method comprising:
diluting an antimony-containing compound with alcohol;
adding yLi 2 MnO 3 -(1−y)LiMO 2 (where M is one or more selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), and 0<y<1) to the obtained diluted antimony-containing compound solution and then stirring;
heating the solution after completion of the stirring to evaporate alcohol; and
performing a heat treatment.
10 . A positive electrode comprising the positive electrode active material of claim 2 .
11 . A lithium ion secondary battery comprising the positive electrode comprising the positive electrode active material of claim 2 , an electrolyte, and a negative electrode.