Positive active material for rechargeable lithium battery and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-2016164094-A1
Application number	US-201514961686-A
Country	US
Kind code	A1
Filing date	Dec 7, 2015
Priority date	Dec 9, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

A positive active material for a rechargeable lithium battery includes a lithium nickel composite oxide having an I (003) /I (104) ratio of greater than or equal to about 0.92 and less than or equal to about 1.02 in X-ray diffraction, wherein the I (003) /I (104) ratio is a ratio of a diffraction peak intensity I (003) of a (003) phase and a diffraction peak intensity I (104) of a (104) phase. The lithium nickel composite oxide includes lithium and a nickel-containing metal, and nickel is present in an amount of greater than or equal to about 80 atm % based on the total atom amount of the nickel-containing metal. A rechargeable lithium battery includes the positive active material.

First claim

What is claimed is:

1 . A positive active material for a rechargeable lithium battery, comprising
a lithium nickel composite oxide having a I (003) /I (104) ratio of greater than or equal to about 0.92 and less than or equal to about 1.02 in X-ray diffraction, wherein the I (003) /I (104) ratio is a ratio of a diffraction peak intensity I (003) of a (003) phase and a diffraction peak intensity I (104) of a (104) phase, wherein the lithium nickel composite oxide comprises lithium and a nickel-containing metal, and nickel is present in an amount of greater than or equal to about 80 atm % based on a total atom amount of the nickel-containing metal.

2 . The positive active material of claim 1 , wherein the lithium nickel composite oxide is represented by Chemical Formula 1:
Li a Ni x Co y M z O 2   Chemical Formula 1
wherein, M is at least one metal selected from aluminum (Al), manganese (Mn), chromium (Cr), iron (Fe), vanadium (V), magnesium (Mg), titanium (Ti), zirconium (Zr), niobium (Nb), molybdenum (Mo), tungsten (W), copper (Cu), zinc (Zn), gallium (Ga), indium (In), tin (Sn), lanthanum (La), and cerium (Ce), 0.2≦a≦1.2, 0.8≦x<1, 0<y≦0.2, 0≦z≦0.1, and x+y+z=1.

3 . The positive active material of claim 2 , wherein in Chemical Formula 1, 0.85≦x<1.

4 . The positive active material of claim 1 , wherein an average particle diameter of secondary particles of the lithium nickel composite oxide is greater than or equal to about 8 μm and less than or equal to about 25 μm.

5 . The positive active material of claim 1 , wherein the lithium nickel composite oxide is obtained by firing a lithium nickel composite oxide precursor at an oxygen partial pressure of greater than about 0.1 MPa and less than about 0.5 MPa.

6 . The positive active material of claim 1 , wherein a full width at half maximum FWHM (003) of a diffraction peak at the (003) phase of the lithium nickel composite oxide in X-ray diffraction is greater than or equal to about 0.13 and less than or equal to about 0.15.

7 . The positive active material of claim 1 , wherein a full width at half maximum FWHM (104) of a diffraction peak at the (104) phase of the lithium nickel composite oxide in X-ray diffraction is greater than or equal to about 0.15 and less than or equal to about 0.18.

8 . The positive active material of claim 1 , wherein the lithium nickel composite oxide has an average transition metal valence of greater than or equal to about 2.9 calculated from an analysis of an X-ray absorption fine structure (XAFS) or from a carbon, hydrogen, nitrogen, oxygen (CHNO) elemental analysis.

9 . A rechargeable lithium battery comprising a positive electrode comprising the positive active material of claim 1 .

10 . The rechargeable lithium battery of claim 9 , wherein the lithium nickel composite oxide is represented by Chemical Formula 1:
Li a Ni x Co y M z O 2   Chemical Formula 1
wherein, M is at least one metal selected from aluminum (Al), manganese (Mn), chromium (Cr), iron (Fe), vanadium (V), magnesium (Mg), titanium (Ti), zirconium (Zr), niobium (Nb), molybdenum (Mo), tungsten (W), copper (Cu), zinc (Zn), gallium (Ga), indium (In), tin (Sn), lanthanum (La), and cerium (Ce), 0.2≦a≦1.2, 0.8≦x<1, 0<y≦0.2, 0≦z≦0.1, and x+y+z=1.

11 . The rechargeable lithium battery of claim 10 , wherein in Chemical Formula 1, 0.85≦x<1.

12 . The rechargeable lithium battery of claim 9 , wherein an average particle diameter of secondary particles of the lithium nickel composite oxide is greater than or equal to about 8 μm and less than or equal to about 25 μm.

13 . The rechargeable lithium battery of claim 9 , wherein the lithium nickel composite oxide is obtained by firing a lithium nickel composite oxide precursor at an oxygen partial pressure of greater than about 0.1 MPa and less than about 0.5 MPa.

14 . The rechargeable lithium battery of claim 9 , wherein a full width at half maximum FWHM (003) of a diffraction peak at the (003) phase of the lithium nickel composite oxide in X-ray diffraction is greater than or equal to about 0.13 and less than or equal to about 0.15.

15 . The rechargeable lithium battery of claim 9 , wherein a full width at half maximum FWHM (104) of a diffraction peak at the (104) phase of the lithium nickel composite oxide in X-ray diffraction is greater than or equal to about 0.15 and less than or equal to about 0.18.

16 . The rechargeable lithium battery of claim 9 , wherein the lithium nickel composite oxide has an average transition metal valence of greater than or equal to about 2.9 calculated from an analysis of an X-ray absorption fine structure (XAFS) or from a carbon, hydrogen, nitrogen, oxygen (CHNO) elemental analysis.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Takei Yuki
• Nakano Masatsugu

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title