Composite cathode active material having improved power characteristics, and secondary battery, battery module, and battery pack including the same

Patent metadata

Field	Value
Publication number	US-9614219-B2
Application number	US-201414463833-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Dec 7, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

Provided is a composite cathode active material including layered lithium manganese oxide and lithium-containing metal oxide. Also, the present invention provides a secondary battery, a battery module, and a battery pack which have improved power characteristics by including the composite cathode active material.

First claim

The invention claimed is:

1. A composite cathode active material comprising:
a layered lithium manganese oxide represented by Chemical Formula 1 shown below; and
a lithium-containing metal oxide represented by Chemical Formula 3 shown below,
wherein a mixing ratio of the layered lithium manganese oxide represented by Chemical Formula 1 and the lithium-containing metal oxide represented by Chemical Formula 3 is in a weight ratio ranging from 90:10 to 70:30,
a [Li 2 MnO 3 ].(1 −a )[LiM 1 O 2 ]  Chemical Formula 1

wherein, 0<a<1 and M1 is one or more metals selected from the group consisting of manganese (Mn), nickel (Ni), cobalt (Co), iron (Fe), chromium (Cr), vanadium (V), copper (Cu), zinc (Zn), titanium (Ti), aluminum (Al), magnesium (Mg), and boron (B); and
Li(Ni x Co y Al z )O 2   Chemical Formula 3

wherein, 0.45≦x≦0.90, 0.05≦y≦0.35, 0.005≦z≦0.20, and x+y+z=1.

2. The composite cathode active material of claim 1 , wherein M 1 in Chemical Formula 1 of the layered lithium manganese oxide includes Mn, Ni, and Co.

3. The composite cathode active material of claim 1 , further comprising one or more selected from the group consisting of lithium cobalt oxide; lithium nickel oxide; lithium manganese oxide; lithium cobalt-nickel oxide; lithium cobalt-manganese oxide; lithium manganese-nickel oxide; lithium cobalt-nickel-manganese oxide; and oxides having one or more other elements selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, calcium (Ca), Zn, zirconium (Zr), niobium (Nb), molybdenum (Mo), strontium (Sr), antimony (Sb), tungsten (W), and bismuth (Bi) substituted or doped therein.

4. A secondary battery comprising the composite cathode active material of claim 1 .

5. A battery module comprising the secondary battery of claim 4 .

6. A battery pack comprising the battery module of claim 5 .

7. The battery pack of claim 6 , wherein the battery pack is used as a power source of one or more medium and large sized devices selected from the group consisting of an electric vehicle (EV) including an electric car, a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV); an electric bike; an electric scooter; an electric golf cart; an electric truck; and an electric commercial vehicle.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Min Hee
• Park Jung Hwan
• Kwon Ki Young

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/485

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

• Y10S903/907

  Electricity storage, e.g. battery, capacitor · CPC title