Lithium Cobalt-Based Positive Electrode Active Material, Preparation Method Thereof, Positive Electrode and Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2021151752-A1
Application number	US-201816764912-A
Country	US
Kind code	A1
Filing date	Dec 10, 2018
Priority date	Dec 8, 2017
Publication date	May 20, 2021
Grant date	—

Abstract

A lithium cobalt-based positive electrode active material is provide, which includes sodium and calcium, wherein the total amount of the sodium and calcium is 150 ppm to 500 ppm based on the total weight of the lithium cobalt-based positive electrode active material. A method for preparing the lithium cobalt-based positive electrode active material is also provided.

First claim

1 . A lithium cobalt-based positive electrode active material comprising sodium and calcium,
wherein a total amount of the sodium and calcium is 150 ppm to 500 ppm based on a total weight of the lithium cobalt-based positive electrode active material.

2 . The lithium cobalt-based positive electrode active material of claim 1 , wherein the sodium and calcium are included in lithium sites of the lithium cobalt-based positive electrode active material.

3 . The lithium cobalt-based positive electrode active material of claim 1 , wherein the lithium cobalt-based positive electrode active material is represented by Formula 1 below:
Li 1-x M 1 x Co 1-y M 2 y O 2   [Formula 1]
wherein M 1 includes Na and Ca, the M 2 is one or more selected from the group consisting of Al, Mg, W, Mo, Zr, Ti, Fe, V, Cr, Ba, Ca, and Nb, and 0<x≤0.1 and 0≤y≤0.2.

4 . A method for preparing a lithium cobalt-based positive electrode active material, comprising:
preparing a mixture by mixing a cobalt precursor containing sodium and calcium in an amount of 600 ppm or less based on a total amount of the cobalt precursor with a lithium raw material; and firing the mixture to prepare a lithium cobalt-based positive electrode active material in which the total amount of sodium and calcium is 150 ppm to 500 ppm based on the total weight of the lithium cobalt-based positive electrode active material.

5 . The method of claim 4 , further comprising measuring contents of sodium and calcium in the cobalt precursor before the preparing of the mixture.

6 . The method of claim 4 , wherein the preparing of the mixture further comprises mixing at least one of a sodium raw material and a calcium raw material.

7 . The method of claim 6 , wherein the sodium raw material and the calcium raw material are mixed such that the total amount of sodium and calcium in a lithium cobalt-based positive electrode active material is 150 ppm to 500 ppm based on the total weight of the lithium cobalt-based positive electrode active material.

8 . A positive electrode comprising the positive electrode active material of claim 1 .

9 . A lithium secondary battery comprising the positive electrode of claim 8 .

10 . The lithium secondary battery of claim 9 , wherein a driving voltage of the lithium secondary battery is 4.45 V or higher.

11 . The lithium cobalt-based positive electrode active material of claim 3 , wherein the M 1 is substitute for a lithium site and the M 2 is substituted for a cobalt site.

12 . The method of claim 4 , wherein the sodium and calcium are in the amount of 50 ppm to 600 ppm.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sung Bin
• You Min Kyu
• Jo Chi Ho
• Hur Hyuck
• Hwang Jin Tae
• Jung Wang Mo

Classifications

• C01P2002/52

  containing elements as dopants · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01G51/66

  containing alkaline earth metals, e.g. SrCoO3 · CPC title