Electrode assembly and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-9905849-B2
Application number	US-201414489873-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Apr 18, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Disclosed are an electrode assembly including a cathode, an anode, and a separator disposed between the cathode and the anode wherein the anode includes lithium titanium oxide (LTO) as an anode active material and the separator is a non-woven separator, and a lithium secondary battery including the same.

First claim

The invention claimed is:

1. An electrode assembly comprising a cathode, an anode, and a separator disposed between the cathode and the anode wherein the anode comprises lithium titanium oxide (LTO) as an anode active material and the separator is a non-woven separator having a porosity of 45 to 90%,
wherein the non-woven separator is made of polyester and the lithium titanium oxide is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 ,
wherein the cathode is a high-voltage cathode comprising a spinel-structure lithium nickel manganese composite oxide (LNMO) represented by Formula 3 below as a cathode active material:
Li x Ni y Mn 2-y O 4   (3)

wherein 0.9≦x≦1.2, and 0.4≦y≦0.5.

2. The electrode assembly according to claim 1 , wherein the lithium nickel manganese composite oxide of Formula 3 is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

3. The electrode assembly according to claim 1 , wherein the non-woven separator has a porosity of 50 to 70%.

4. The electrode assembly according to claim 1 , wherein the polyester is polybutyleneterephthalate.

5. A secondary battery comprising an electrode assembly according to claim 1 .

6. The secondary battery according to claim 5 , wherein the secondary battery is a lithium secondary battery.

7. A battery module comprising the secondary battery according to claim 6 as a unit battery.

8. A battery pack comprising the battery module according to claim 7 .

9. A device comprising the battery pack according to claim 8 .

10. The device according to claim 9 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Daehong
• Lee Youn Kyoung
• Lim Soo Hyun
• Park Tae Jin

Classifications

• H01M50/409

  Separators, membranes or diaphragms characterised by the material · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/429

  Natural polymers · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title