Method for Preparing Positive Electrode Active Material for Lithium Secondary Battery, Positive Electrode Active Material for Lithium Secondary Battery, and Lithium Secondary Battery Including Same
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Synthetic Example 1
Preparation of Lithium Composite Oxide
[0124]Li2CO3 (Product name: SQM) and Ni0.47Co0.20Mn0.33(OH)2(D50: 5 μm) were mixed at a weight ratio of 1:1.03 (Metal:Li) using a mixer. The obtained mixture was fired for a total of 20 hours while the time rise reaction time was 6 hours in air and the time for a maintenance period was 7 hours at 950° C., thereby preparing a fired material.
[0125]The obtained fired material was slowly cooled and then reduced to powder, thereby obtaining a lithium composite oxide powder for mixing and firing according to an embodiment of the present invention.
Example 1
Preparation of Positive Electrode Active Material Through Mixing and Firing
[0126]Li2CO3 (Product name: SQM) and Ni0.55Co0.20Mn0.25(OH)2 were mixed at a weight ratio of 1:1.03 (Metal:Li) using a mixer.
[0127]After the final firing, LiNi0.47Co0.20Mn0.33O2 was further added thereto such that the weight ratio of LiNi0.55Co0.20Mn0.25O2 and Li0.47Co0.20Mn0.33O2 of Synthetic Example 1 was ...
Example
Example 2
Preparation of Positive Electrode Active Material Through Mixing and Firing
[0130]A positive electrode active material was prepared by the same method as in Example 1, except that LiNi0.47CO0.20Mn0.33O2 was added such that the weight ratio of LiNi0.55CO0.20Mn0.25O2 and LiNi0.47CO0.20Mn0.33O2 was 80:20, followed by mixing and firing.
Example
Example 3
Preparation of Positive Electrode Active Material Through Mixing and Firing
[0131]A positive electrode active material was prepared by the same method as in Example 1, except that LiNi0.47CO0.20Mn0.33O2 was added such that the weight ratio of LiNi0.55CO0.20Mn0.25O2 and LiNi0.47CO0.20Mn0.33O2 was 70:30, followed by mixing and firing.
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