Positive electrode composition for rechargeable lithium battery, and positive electrode for rechargeable lithium battery and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-9627690-B2
Application number	US-201514726236-A
Country	US
Kind code	B2
Filing date	May 29, 2015
Priority date	Aug 5, 2014
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A positive electrode composition for a rechargeable lithium battery includes a positive active material, a spherically shaped conductive material, and a sheet-shaped conductive material. The spherically shaped conductive material is included in an amount of about 1.1 to about 10 parts by weight based on 1 part by weight of the sheet-shaped conductive material. A positive electrode includes the positive electrode composition and a rechargeable lithium battery includes the positive electrode.

First claim

What is claimed is:

1. A positive electrode composition for a rechargeable lithium battery, comprising:
a positive active material;
a sheet-shaped conductive material; and
a spherically shaped conductive material, which is included in an amount of about 1.1 to about 10 parts by weight based on 1 part by weight of the sheet-shaped conductive material,
wherein the sheet-shaped conductive material comprises sheet-shaped graphite, a flake-shaped carbon, or combination thereof, and
wherein the spherically shaped conductive material comprises carbon black, a conductive aerogel, or a combination thereof.

2. The positive electrode composition of claim 1 , wherein the spherically shaped conductive material is included in an amount of about 1 to about 15wt % by weight based on a total weight of the positive electrode composition.

3. The positive electrode composition of claim 1 , wherein the sheet-shaped conductive material is included in an amount of about 0.1 to about 5 wt % by weight based on a total weight of the positive electrode composition.

4. The positive electrode composition of claim 1 , wherein the spherically shaped conductive material has an average particle diameter of about 1 nm to about 500 nm.

5. The positive electrode composition of claim 1 , wherein the sheet-shaped conductive material has a long diameter of about 4 μm to about 7 μm.

6. The positive electrode composition of claim 1 , wherein the positive electrode composition further comprises a binder.

7. The positive electrode composition of claim 1 , wherein the positive active material comprises a lithium manganese-based oxide, a lithium nickel-based oxide, a lithium cobalt-based oxide, a lithium nickel manganese-based oxide, a lithium nickel cobalt-based oxide, a lithium nickel cobalt manganese-based oxide, a lithium nickel cobalt aluminum-based oxide, a lithium iron phosphate-based compound, a lithium manganese phosphate-based compound, a lithium cobalt phosphate-based compound, a lithium vanadium phosphate-based compound, or a combination thereof.

8. A positive electrode for a rechargeable lithium battery, comprising the positive electrode composition of claim 1 .

9. The positive electrode of claim 8 , wherein the positive electrode has a loading level of about 33 to about 45 mg/cm 2 .

10. A rechargeable lithium battery, comprising
the positive electrode of claim 8 ;
a negative electrode; and
an electrolyte solution.

11. The rechargeable lithium battery of claim 10 , wherein the rechargeable lithium battery has a current density of about 2 to about 8 mA/cm 2 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim In
• Kim Eun-Jung
• Yang Sang-Woon
• Kim Young-Eun
• Kim Jae-Kyung

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/5825

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

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M4/625 Primary

  Carbon or graphite · CPC title