# US 2019/0169042 A1 · Metal-doped cobalt precursor for preparing positive electrode active material for secondary battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0169042 A1
- Document ID: US20190169042A1
- Status: Published application
- Kind: A1
- Application number: 16/310,007
- Filed: 2017-12-20
- Published: 2019-06-06
- Earliest claimed: 2016-12-21
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Chi Ho Jo; Sungbin Park; Jiyoung Park; Bo Ram Lee; Hyuck Hur; Wang Mo Jung
- Web page: https://patentgrep.com/patent/US20190169042A1

## CPC

- C01G 51/84: Hydroxides
- C01G 51/42: containing alkali metals, e.g. LiCoO2
- C01G 51/66: containing alkaline earth metals, e.g. SrCoO3
- H01M 4/1315: containing halogen atoms, e.g. LiCoOxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- C01P 2006/40: Electric properties
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a cobalt precursor for preparing a lithium cobalt oxide of a layered structure which is included in a positive electrode active material, wherein the cobalt precursor is cobalt oxyhydroxide (CoM′OOH) doped with, as dopants, magnesium (Mg) and M′ different from the magnesium.

## Claims

### Claim 1

A cobalt precursor for preparing a lithium cobalt oxide of a layered structure which is included in a positive electrode active material, wherein the cobalt precursor is
cobalt oxyhydroxide ((CoxMgyM′z)OOH)
wherein (x, y, and z satisfy the following weight ratio conditions: a content of x is in the range of 99 wt % to 99.8 wt % and a total content of y and z is in the range of 0.2 wt % to 1 wt %, when the sum of x, y, and z is regarded as 100 wt %;
M′ is one or more selected from the group consisting of Al, Ti, Mn, Zr, Ba, B, Ca, Ta, Mo, Nb, W, Sr and PO4
wherein the cobalt precursor is doped with, as dopants, magnesium (Mg) and M′.

### Claim 2

A lithium cobalt oxide having a layered structure for a positive electrode active material, wherein the lithium cobalt oxide is represented by the following Formula 1, and doped with, as dopants, magnesium (Mg) and M′; and
the dopants have an average oxidation number of more than +2 to +2.5 or less in the lithium cobalt oxide:
Lia(CoxMgyM′z)O2 (1)
wherein a satisfies 0.95≤a≤1.05;
x, y, and z satisfy the following weight ratio conditions: a content of x is in the range of 99 wt % to 99.8 wt % and a total content of y and z is in the range of 0.2 wt % to 1 wt %, when the sum of x, y, and z is regarded as 100 wt %; and
M′ is one or more selected from the group consisting of Al, Ti, Mn, Zr, Ba, B, Ca, Ta, Mo, Nb, W, Sr, and PO4.

### Claim 3 (depends on 2)

The lithium cobalt oxide of claim 2, wherein the lithium cobalt oxide maintains a crystal structure in a charging range of more than 4.5 V and 4.8 V or less.

### Claim 4 (depends on 3)

The lithium cobalt oxide of claim 3, wherein the crystal structure is O3 phase.

### Claim 5 (depends on 2)

The lithium cobalt oxide of claim 2, wherein the lithium cobalt oxide has no plateau at 4.55 V of initial charge/discharge profiles.

### Claim 6 (depends on 2)

The lithium cobalt oxide of claim 2, wherein the positive electrode active material is in the form of particles, and the surface of the particle is coated with Al2O3.

### Claim 7 (depends on 6)

The lithium cobalt oxide of claim 6, wherein the Al2O3 is applied at a thickness of 0.2% to 5%, based on a diameter of the positive electrode active material particle.

### Claim 8 (depends on 1)

A method of preparing a lithium cobalt oxide using the cobalt precursor, the method comprising:
(a) preparing the cobalt precursor of claim 1 which is doped with dopants provided from a doping precursor by co-precipitation reaction of a cobalt acid salt and the doping precursor; and
(b) mixing the dopant-doped cobalt precursor and a lithium precursor to form a mixture;
(c) heat treatmenting the mixture.

### Claim 9 (depends on 8)

The method of claim 8, wherein the doping precursor is mixed such that a content of the cobalt is in the range of 99 wt % to 99.8 wt %, and a total content of the dopants is in the range of 0.2 wt % to 1 wt %, when the sum of the cobalt and the dopants is regarded as 100 wt %.

### Claim 10 (depends on 8)

The method of claim 8, wherein the heat treatmenting is performed at 950° C. to 1100° C. for 8 hours to 15 hours.

### Claim 11 (depends on 8)

The method of claim 8, wherein the cobalt acid salt is cobalt oxyhydroxide (CoOOH).

### Claim 12 (depends on 8)

The method of claim 8, wherein the lithium precursor is one or more selected from the group consisting of Li2CO3, LiOH, LiNO3, CH3COOLi, and Li2(COO)2.

### Claim 13 (depends on 8)

The method of claim 8, wherein the doping precursor includes:
one or more selected from the group consisting of a mixed metal of Mg, and
one or more selected from the group consisting of Al, Ti, Mn, Zr, Ba, B, Ca, Ta, Mo, Nb, W, Sr, and P, a metal oxide thereof, and a metal salt thereof.

### Claim 14 (depends on 2)

The lithium cobalt oxide of claim 2,
wherein the lithium cobalt oxide has a structure in which a ratio (IO3/IH1-3) of a peak intensity of O3 phase to a peak intensity of H1-3 phase is more than 1 in the spectrum of X-ray diffraction (XRD) analysis using Cu—Kα:
Lia(CoxMgyM′z)O2 (1)
wherein a satisfies 0.95≤a≤1.05;
x, y, and z satisfy the following weight ratio conditions: a content of x is in the range of 99 wt % to 99.8 wt % and a total content of y and z is in the range of 0.2 wt % to 1 wt %, when the sum of x, y, and z is regarded as 100 wt %; and
M′ is one or more selected from the group consisting of Al, Ti, Mn, Zr, Ba, B, Ca, Ta, Mo, Nb, W, Sr, and PO4.