Positive active material and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9979023-B2
Application number	US-201213602033-A
Country	US
Kind code	B2
Filing date	Aug 31, 2012
Priority date	May 23, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The present invention provides a positive active material including a lithium-containing compound represented by the following Chemical Formula 1 and a rechargeable lithium battery including the positive active material.

LiFe 1-x-z M x M′ z P y O 4 .  Chemical Formula 1

First claim

What is claimed is:

1. A positive active material comprising a lithium-containing compound represented by the following Chemical Formula 1:
LiFe 1-x-z M x M′ z P y O 4   Chemical Formula 1

wherein, M is vanadium (V), M′ is cobalt (Co), manganese (Mn), magnesium (Mg), zirconium (Zr), nickel (Ni), or a combination thereof, and about 0<x<about 0.20, about 0≤z<about 0.20, and about 0.90<y<about 1.20,
wherein the lithium-containing compound comprises secondary particles formed of agglomerated primary particles, the secondary particles having a particle size in the range of about 5 μm to about 30 μm, and wherein x and z have a ratio of about 0.5≤x/z≤about 5.

2. The positive active material of claim 1 , wherein x and y have a ratio of about 0.009≤x/y≤ about 0.07.

3. The positive active material of claim 1 , wherein x and y have a ratio of about 0.03≤x/y≤ about 0.07.

4. The positive active material of claim 1 , wherein x and y have an x/y ratio of about 0.05.

5. The positive active material of claim 1 , wherein M is vanadium (V) and M′ is cobalt (Co).

6. The positive active material of claim 1 , wherein the lithium-containing compound is selected from the group consisting of LiFe 0.96 V 0.05 Co 0.01 PO 4 , LiFe 0.925 V 0.05 Co 0.025 PO 4 , LiFe 0.9 V 0.05 Co 0.05 PO 4 , and combinations thereof.

7. The positive active material of claim 1 , wherein a particle size of the primary particles is in a range of about 50 nm to about 1000 nm.

8. The positive active material of claim 7 , wherein the particle size of the primary particles is in a range of about 50 nm to about 200 nm.

9. A rechargeable lithium battery comprising a positive electrode comprising the positive active material according to claim 1 , a negative electrode, and an electrolyte.

10. The positive active material of claim 1 , wherein 1.03≤y< about 1.20.

11. The positive active material of claim 1 , wherein x and y have a ratio of about 0.048≤x/y≤ about 0.07.

12. A positive active material comprising a lithium-containing compound represented by the following Chemical Formula 1:
LiFe 1-x-z M x M′ z P y O 4   Chemical Formula 1

wherein, M is vanadium (V), M′ is cobalt (Co), manganese (Mn), magnesium (Mg), zirconium (Zr), nickel (Ni), or a combination thereof, and about 0<x<about 0.20, about 0≤z<about 0.20, and about 0.90<y<about 1.20,
wherein the lithium-containing compound comprises secondary particles formed of agglomerated primary particles, the secondary particles having a particle size in the range of about 5 μm to about 30 μm, and wherein x and z have an x/z ratio of about 2.

Assignees

• Song Jay Hyok
• Park Sang In
• Kim Ji Hyun
• Kim Ki Hyun
• You Yong Chan
• Lee Ha Young
• Samsung Sdi Co Ltd

Inventors

• Song Jay-Hyok
• Park Sang-In
• Kim Ji-Hyun
• Kim Ki-Hyun
• You Yong-Chan
• Lee Ha-Young

Classifications

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title