Rechargeable lithium battery and a method of making a rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-9478783-B2
Application number	US-201314051302-A
Country	US
Kind code	B2
Filing date	Oct 10, 2013
Priority date	Dec 5, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

Provided is a rechargeable lithium battery that includes a positive electrode including a positive active material; a negative electrode including a negative active material; a separator interposed between the positive electrode and the negative electrode; and an electrolyte solution, wherein the positive active material includes lithium metal oxide and a compound represented by the following Chemical Formula 1 and coated on a surface of the lithium metal oxide, and the separator includes a porous substrate and a coating layer including ceramic and disposed on at least one side of the porous substrate.

Li 1+x Al x M 2−x (PO 4 ) 3   [Chemical Formula 1]

In Chemical Formula 1, M is at least one metal selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si, and 0<x≦0.7.

First claim

What is claimed is:

1. A rechargeable lithium battery comprising:
a positive electrode comprising a positive active material;
a negative electrode comprising a negative active material;
a separator interposed between the positive electrode and the negative electrode, the separator comprising a porous substrate and a coating layer comprising a ceramic material disposed on at least one side of the porous substrate; and
an electrolyte solution,
wherein the positive active material comprises a lithium metal oxide, and a compound represented by the following Chemical Formula 1 on the surface of the lithium metal oxide:
Li 1+x Al x M 2−x (PO 4 ) 3   Chemical Formula 1

wherein M is at least one selected from Ti, Cr, Ga, Fe, Sc, In, Y, Mg, and Si, and 0<x≦0.7.

2. The rechargeable lithium battery of claim 1 , wherein the coating layer is formed on one side or both sides of the porous substrate.

3. The rechargeable lithium battery of claim 1 , wherein the coating layer has a thickness of from about 1 μm to about 10 μm.

4. The rechargeable lithium battery of claim 1 , wherein the coating layer has a porosity of from about 30 volume % to about 55 volume %.

5. The rechargeable lithium battery of claim 1 , wherein the coating layer further comprises a heat-resistance resin selected from the group consisting of an aramid resin, a polyamideimide resin, a polyimide resin, or a combination thereof.

6. The rechargeable lithium battery of claim 1 , wherein the porous substrate comprises a polyolefin resin.

7. The rechargeable lithium battery of claim 1 , wherein the ceramic material comprises Al 2 O 3 , MgO, TiO 2 , Al(OH) 3 , Mg(OH) 2 , Ti(OH) 4 , or a combination thereof.

8. The rechargeable lithium battery of claim 1 , wherein the lithium metal oxide comprises at least one of Co, Mn, Ni and Al.

9. The rechargeable lithium battery of claim 1 , wherein M is Ti.

10. The rechargeable lithium battery of claim 1 , wherein the compound represented by Chemical Formula 1 is Li 1+x Al x Ti 2−x (PO 4 ) 3 and 0.1<x≦0.5.

11. The rechargeable lithium battery of claim 1 , wherein the compound represented by Chemical Formula 1 is coated on the lithium metal oxide.

12. The rechargeable lithium battery of claim 1 , wherein the compound represented by Chemical Formula 1 is formed non-continuously on the lithium metal oxide.

13. The rechargeable lithium battery of claim 1 , wherein the compound represented by Chemical Formula 1 is included in an amount of about 1 wt % to about 3 wt % based on the total amount of the positive active material.

14. The rechargeable lithium battery of claim 1 , wherein the compound represented by Chemical Formula 1 is included in an amount of about 1.5 wt % to about 2.5 wt % based on the total amount of the positive active material.

15. The rechargeable lithium battery of claim 1 , wherein the operation voltage of the rechargeable lithium battery is about 4.3V or higher.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Hong Chong-Gi
• Lee Joon-Hyung

Classifications

• H01M4/5825 Primary

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

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/423

  Polyamide resins · CPC title

• H01M50/417

  Polyolefins · CPC title