# US 2017/0288206 A1 · Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material

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- Number: US 2017/0288206 A1
- Document ID: US20170288206A1
- Status: Published application
- Kind: A1
- Application number: 15/623,929
- Filed: 2017-06-15
- Published: 2017-10-05
- Earliest claimed: 2013-09-30
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Dong Kwon Lee; Seung Beom Cho; Jun Seok Nho; Wook Jang
- Web page: https://patentgrep.com/patent/US20170288206A1

## CPC

- H01M 4/0416: {involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence)}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a cathode active material including a lithium-containing transition metal oxide and two or more metal composite oxide layers selected from the group consisting of Chemical Formulae 1 to 3 which are coated on the surface of the lithium-containing transition metal oxide, a method of manufacturing the same, and a cathode for a secondary battery including the cathode active material, [Chemical Formula 1] M(C2H5O2)n [Chemical Formula 2] M(C6H(8-n)O7) [Chemical Formula 3] M(C6H(8-n)O7)(C2H5O2) (where M, as a metal desorbed from a metal precursor, represents at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ir, Ni, Zn, Al, Ga, In, Si, Ge, Sn, La, and Ce, and n is an integer between 1 and 4).

## Claims

### Claim 1

A cathode active material comprising:
a lithium-containing transition metal oxide; and
two or more metal composite oxide layers selected from the group consisting of Chemical Formulae 1 to 3 which are coated on a surface of the lithium-containing transition metal oxide:
[Chemical Formula 1]
M(C2H5O2)n
[Chemical Formula 2]
M(C6H(8-n)O7)
[Chemical Formula 3]
M(C6H(8-n)O7)(C2H5H2)
(where M, as a metal desorbed from a metal precursor, represents at least one metal selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), yttrium (Y), titanium (Ti), zirconium (Zr), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), iron (Fe), cobalt (Co), iridium (Ir), nickel (Ni), zinc (Zn), aluminum (Al), gallium (Ga), indium (In), silicon (Si), germanium (Ge), tin (Sn), lanthanum (La), and cerium (Ce), and n is an integer between 1 and 4).

### Claim 2 (depends on 1)

The cathode active material of claim 1, wherein the lithium-containing transition metal oxide comprises one selected from the group consisting of LiMO2 (M═Co, Mn, Ni, Ni1/3Co1/3Mn1/3, Cr, or V), LiMO4 (M═CoMn, NiV, CoV, CoP, FeP, MnP, NiP, or Mn2), Li(NiaCobMnc)O2 (0<a<1, 0<b<1, 0<c<1, a+b+c=1), LiNi1-yCoyO2, LiCo1-yMnyO2, LiNi1- yMnyO2 (0<y<1), Li(NiaMnbCOc)O4(0<a<2, 0<b<2, 0<c<2, a+b+c=2), LiMn2-zNizO4, LiMn2-zCozO4 (0<z<2), and LiV3O6.

### Claim 3 (depends on 1)

The cathode active material of claim 1, wherein the lithium-containing transition metal oxide is LiCoO2, LiNiO2, LiMnO2, LiCuO2, LiMn2O4, LiNi1/3Mn1/3Co1/3O2, LiNi0.6Mn0.2Co0.2O2, LiCoPO4, or LiFePO4.

### Claim 4 (depends on 1)

The cathode active material of claim 1, wherein the two or more metal composite oxide layers are formed in a single layer structure, in which two or more metal composite oxides are uniformly mixed, or a multilayer structure having two or more layers in which two or more metal composite oxide layers are sequentially stacked.

### Claim 5 (depends on 1)

The cathode active material of claim 1, wherein a total thickness of the two or more metal composite oxide layers is in a range of 5 nm to 500 nm.

### Claim 6 (depends on 1)

The cathode active material of claim 1, wherein an amount of metal in the two or more metal composite oxide layers is in a range of 0.01 wt % to 10 wt % based on a total weight of the lithium-containing transition metal oxide.

### Claim 7 (depends on 1)

The cathode active material of claim 1, wherein the two or more metal composite oxide layers comprise a composite oxide of at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ir, Ni, Zn, Al, Ga, In, Si, Ge, Sn, La, and Ce.