Positive active material for rechargeable lithium battery and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-10193140-B2
Application number	US-201213597214-A
Country	US
Kind code	B2
Filing date	Aug 28, 2012
Priority date	Apr 30, 2012
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A positive electrode for a rechargeable lithium battery includes a positive active material and activated carbon, wherein an average particle diameter of the activated carbon is about 100% to about 160% relative to 100% of an average particle diameter of the positive active material.

First claim

What is claimed is:

1. A positive electrode for a rechargeable lithium battery, comprising:
a positive active material consisting of LiCoO 2 or Li a CoG b O 2 (0.90≤a≤1.8, 0.001≤b≤0.1, G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof); and
activated carbon having an average particle diameter larger than an average particle diameter of the positive active material and in a range of about 122% to about 160% relative to 100% of the average particle diameter of the positive active material,
wherein the positive active material and activated carbon are present in a mixed ratio in a range of about 98:2 to about 94:6.

2. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the average particle diameter of the activated carbon is in a range of about 133% to about 140% relative to 100% of the average particle diameter of the positive active material.

3. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the average particle diameter of the activated carbon is in a range of about 1 μm to about 32 μm.

4. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the average particle diameter of the activated carbon is in a range of about 1 μm to about 30 μm.

5. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the positive electrode further comprises a conductive material and a binder.

6. A rechargeable lithium battery, comprising:
a positive electrode comprising a positive active material consisting of LiCoO 2 or Li a CoG b O 2 (0.90≤a≤1.8, 0.001≤b≤0.1, G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof) and activated carbon having an average particle diameter larger than an average particle diameter of the positive active material and in a range of about 122% to about 160% relative to 100% of the average particle diameter of the positive active material;
a negative electrode including a negative active material; and
an electrolyte including an organic solvent and a lithium salt,
wherein the positive active material and activated carbon are present in a mixed ratio in a range of about 98:2 to about 94:6.

7. The rechargeable lithium battery of claim 6 , wherein the negative active material is amorphous carbon.

8. The rechargeable lithium battery of claim 6 , wherein the average particle diameter of the activated carbon is in a range of about 133% to about 140% relative to 100% of the average particle diameter of the positive active material.

9. The rechargeable lithium battery of claim 6 , wherein the average particle diameter of the activated carbon is in a range of about 1 μm to about 32 μm.

10. The rechargeable lithium battery of claim 6 , wherein the average particle diameter of the activated carbon is in a range of about 1 μm to about 30 μm.

11. The rechargeable lithium battery of claim 6 , wherein the positive electrode further comprises a conductive material and a binder.

12. The rechargeable lithium battery of claim 1 , wherein the positive active material consists of LiCoO 2 .

13. The rechargeable lithium battery of claim 6 , wherein the positive active material consists of LiCoO 2 .

14. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the average particle diameter of the activated carbon is 6.65 μm to 8.08 μm.

15. The rechargeable lithium battery of claim 6 , wherein the average particle diameter of the activated carbon being 6.65 μm to 8.08 μm.

Assignees

• An Jung Woo
• Sheem Kyeu Yoon
• Ishida Sumihito
• Samsung Sdi Co Ltd

Inventors

• An Jung-Woo
• Sheem Kyeu-Yoon
• Ishida Sumihito

Classifications

• H01M2004/021

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

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title