# US 2015/0147653 A1 · Positive electrode for rechargeable lithium battery, preparing same, and rechargeable lithium battery

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- Number: US 2015/0147653 A1
- Document ID: US20150147653A1
- Status: Published application
- Kind: A1
- Application number: 14/540,857
- Filed: 2014-11-13
- Published: 2015-05-28
- Earliest claimed: 2013-11-22
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Keisuke Nomura; Yuki Takei; Masatsugu Nakano
- Web page: https://patentgrep.com/patent/US20150147653A1

## CPC

- 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
- C01G 53/42: containing alkali metals, e.g. LiNiO2
- C01G 53/506: with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.8, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.8
- C01P 2002/74: by peak-intensities or a ratio thereof only
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- H01M 10/052: Li-accumulators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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)
- 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

A positive active material is disclosed that includes a lithium nickel composite oxide represented by the following Chemical Formula 1, wherein a full width at half maximum (FWHM003) at a (003) plane in X-ray diffraction ranges from about 0.12 to about 0.155, and a rechargeable lithium ion battery including the same. LiaNixCoyMzO2 [Chemical Formula 1]

## Claims

### Claim 1

A positive active material that includes a lithium nickel composite oxide represented by the following Chemical Formula 1,
wherein a full width at half maximum (FWHM003) at a (003) plane in X-ray diffraction ranges from about 0.12 to about 0.155.
LiaNixCoyMzO2 [Chemical Formula 1]
wherein, M is one or more kinds of metal element selected from Al, Mn, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce,
0.20≦a≦1.20,
0.80≦x<1.00,
0<y≦0.20,
0≦z≦0.10, and
x+y+z=1.

### Claim 2 (depends on 1)

The positive active material of claim 1, wherein the positive active material has a (I003)/(I104) ratio of a diffraction peak intensity (I003) at a (003) plane and a diffraction peak intensity (I104) at a (104) plane in X-ray diffraction ranges from about 1.05 to about 1.25.

### Claim 3 (depends on 1)

The positive active material of claim 1, wherein the lithium nickel composite oxide particle has an average secondary particle diameter (D50) of about 3 μm to about 9 μm.

### Claim 4 (depends on 1)

The positive active material of claim 1, wherein the lithium nickel composite oxide particle has a specific surface area of about 0.38 m2/g to about 1.05 m2/g.

### Claim 5 (depends on 1)

The positive active material of claim 1, wherein M is Al or Mn,
0.80≦x<1.00,
0<y≦0.15,
0<z≦0.05, and x+y+z=1.

### Claim 6

A method of preparing a positive active material, comprising;
adding a saturated NaOH aqueous solution to a mixed aqueous solution including a hydrate of Co and Ni and an M-containing compound in a dropwise fashion so as to maintaining pH to be 8 to 12;
agitating the resulting mixture to prepare a hydroxide salt precursor of a transition metal; and
mixing the hydroxide salt precursor of the transition metal with a Li compound, and firing the resultant under an oxygen atmosphere at about 700° C. to about 800° C. for about 1 hour to about 10 hours to prepare a lithium nickel composite oxide,
wherein the M-containing compound is a sulfate, a nitrate, an oxide, or a hydroxide of the metal element M, and
the M is one or more kinds of metal element selected from Al, Mn, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La, and Ce.

### Claim 7 (depends on 6)

The method of claim 6, wherein the mixing mole ratio of the hydrate of Co and Ni and the M-containing compound is Ni:Co:Al=(80 to 84):15:(1 to 5).

### Claim 8 (depends on 1)

A rechargeable lithium battery comprising;
the positive electrode including a positive active material of claim 1;
a negative electrode; and
an electrolyte.