Positive electrode for rechargeable lithium battery, and winding element rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-10026964-B2
Application number	US-201514981594-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 26, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A positive electrode for a rechargeable lithium battery includes a positive current collector; a high elastic modulus layer on the positive current collector and including a first positive active material and a high elastic modulus binder; and a low elastic modulus layer on the high elastic modulus layer and including a second positive active material and a low elastic modulus binder, wherein the low elastic modulus binder has a lower tensile modulus than the high elastic modulus binder. A winding element includes the positive electrode. A rechargeable lithium battery includes the winding element.

First claim

What is claimed is:

1. A positive electrode for a rechargeable lithium battery comprising:
a positive current collector;
a high elastic modulus layer on the positive current collector and comprising a first positive active material and a high elastic modulus binder; and
a low elastic modulus layer positioned on the high elastic modulus layer and comprising a second positive active material and a low elastic modulus binder,
wherein the low elastic modulus layer is positioned on the high elastic modulus layer that is on the positive current collector in that order, and
wherein the low elastic modulus binder has lower tensile modulus than the high elastic modulus binder.

2. The positive electrode of claim 1 , wherein the high elastic modulus binder has a tensile modulus of about 400 MPa to about 1200 MPa.

3. The positive electrode of claim 1 , wherein the low elastic modulus binder has a tensile modulus of about 150 MPa to about 700 MPa.

4. The positive electrode of claim 1 , wherein at least one selected from the high elastic modulus binder and the low elastic modulus binder comprises a copolymer.

5. The positive electrode of claim 1 , wherein at least one selected from the first positive active material and the second positive active material comprises a lithium transition metal oxide.

6. A winding element comprising the positive electrode of claim 1 .

7. A rechargeable lithium battery comprising the winding element of claim 6 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Nomura Keisuke
• Fukahori Hironobu

Classifications

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0525

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

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• Y02P70/50

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