Lithium transition metal composite particles, preparation method thereof, and cathode active material including the same

Patent metadata

Field	Value
Publication number	US-9887420-B2
Application number	US-201414552932-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Aug 29, 2013
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

Provided are lithium transition metal composite particle including a lithium transition metal oxide particle, a metal-doped layer formed by doping the lithium transition metal oxide particle, and LiF formed on the lithium transition metal oxide particle including the metal-doped layer, a preparation method thereof, and a lithium secondary battery including the lithium transition metal composite particles.

First claim

The invention claimed is:

1. A lithium transition metal composite particle comprising:
a lithium transition metal oxide particle;
a zirconium-doped layer formed by doping the lithium transition metal oxide particle;
LiF formed on the lithium transition metal oxide particle including the zirconium-doped layer,
wherein the zirconium-doped layer comprises composite particles of Chemical Formula 1:
Li a M 1-b Zr b O 2   <Chemical Formula 1>

where M=Ni x Mn y Co z , (0.3≦x≦0.9, 0≦y≦0.6, and 0≦z≦0.6),
0.9≦a≦1.3, and
0≦b≦0.02.

2. The lithium transition metal composite particle of claim 1 , wherein the zirconium-doped layer is included in an amount of 0.01 wt % to 3 wt % based on 100 wt % of the lithium transition metal composite particle.

3. The lithium transition metal composite particle of claim 1 , wherein the zirconium has a concentration gradient in which a concentration gradually decreases from a surface of the lithium transition metal oxide particle to inside thereof.

4. The lithium transition metal composite particle of claim 1 , wherein the zirconium-doped layer further comprises an oxide including the zirconium.

5. The lithium transition metal composite particle of claim 1 , wherein a doping amount of the zirconium is greater than 0 mol % and equal to or less than 2 mol %.

6. The lithium transition metal composite particle of claim 1 , wherein the LiF is included in an amount of 0.1 wt % to 0.5 wt % based on a total weight of the lithium transition metal composite particles.

7. The lithium transition metal composite particle of claim 1 , wherein the lithium transition metal oxide is any one selected from the group consisting of lithium-cobalt-based oxide, lithium-manganese-based oxide, lithium-nickel-manganese-based oxide, lithium-manganese-cobalt-based oxide, and lithium-nickel-manganese-cobalt-based oxide, or a mixture of two or more thereof.

8. The lithium transition metal composite particle of claim 7 , wherein the lithium transition metal oxide is any one selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 O 4 , Li(Ni a Co b Mn c )O 2 (where 0<a<1, 0<b<1, 0<c<1, and a+b+c=1), LiNi 1-Y Co Y O 2 , LiCo 1-Y Mn Y O 2 , LiNi 1-Y Mn Y O 2 (where 0≦Y<1), Li(Ni a Co b Mn c )O 4 (where 0<a<2, 0<b<2, 0<c<2, and a+b+c=2), LiMn 2-z Ni z O 4 , and LiMn 2-z Co z O 4 (where 0<z<2), or a mixture of two or more thereof.

9. A cathode active material comprising the lithium transition metal composite particles of claim 1 .

10. A cathode comprising the cathode active material of claim 9 .

11. A lithium secondary battery comprising:
a cathode;
an anode; and
a separator disposed between the cathode and the anode,
wherein the cathode is the cathode of claim 10 .

Assignees

• Lg Chemical Ltd

Inventors

• Park Sung Bin
• Kim Ji Hye
• Jung Wang Mo
• Oh Sang Seung
• Park Byung Chun

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · 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