Anode active material for lithium secondary battery and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11043673-B2
Application number	US-201816479193-A
Country	US
Kind code	B2
Filing date	Jan 17, 2018
Priority date	Jan 20, 2017
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Provided are an anode active material for a lithium secondary battery and a lithium secondary battery comprising the same, wherein the anode active material comprises at least three types of spherical graphite, and a difference between a 90% volume cumulative diameter (D90) and a 10% volume cumulative diameter (D10) is in the range of 13.0 μm≤(D90−D10)≤35.0 μm.

First claim

The invention claimed is:

1. An anode active material for a lithium secondary battery, comprising:
at least three sizes of spherical graphite,
wherein a difference between a 90% volume cumulative diameter (D 90 ) and a 10% volume cumulative diameter (D 10 ) is in the range of 13.0 μm≤(D 90 −D 10 )≤35.0 μm.

2. The anode active material of claim 1 , wherein a difference between a 90% volume cumulative diameter (D 90 ) and a 10% volume cumulative diameter (D 10 ) relative to a sum of 10% volume cumulative diameter (D 10 ), 50% volume cumulative diameter (D 50 ), and 90% volume cumulative diameter (D 90 ) is 0.30≤(D 90 −D 10 )/(D 10 +D 50 +D 90 )≤0.60.

3. The anode active material of claim 1 , wherein the spherical graphite comprises coarse-grained spherical graphite having an average particle diameter of 17.0 μm to 20.0 μm; medium-grained spherical graphite having an average particle diameter of 11.0 μm to 13.0 μm; and fine-grained spherical graphite having an average particle diameter of 3.0 μm to 4.0 μm.

4. The anode active material of claim 3 , wherein a ratio of the average particle diameter of the medium-grained spherical graphite relative to the average particle diameter of the coarse-grained spherical graphite is 0.5 to 0.8.

5. The anode active material of claim 3 , wherein a ratio of the average particle diameter of the fine-grained spherical graphite relative to the average particle diameter of the coarse-grained spherical graphite is 0.15 to 0.3.

6. The anode active material of claim 3 , wherein a circularity of the coarse-grained spherical graphite is 0.6 to 0.9,
a circularity of the medium-grained spherical graphite is 0.7 to 0.99, and
a circularity of the fine-grained spherical graphite is 0.6 to 0.9.

7. The anode active material of claim 3 , wherein the fine-grained spherical graphite is included in an amount of 10 to 60 parts by weight based on 100 parts by weight of the medium-grained spherical graphite.

8. The anode active material of claim 3 , wherein the fine-grained spherical graphite is included in an amount of 5 to 20 parts by weight based on 100 parts by weight of the coarse-grained spherical graphite.

9. The anode active material of claim 3 , wherein the medium-grained spherical graphite and the coarse-grained spherical graphite are included in a weight ratio of 1:10 to 6:4.

10. The anode active material of claim 1 , wherein an orientation degree (I(002)/I(110)) of the anode active material is 160 to 180.

11. A lithium secondary battery, comprising:
an anode comprising the anode active material of claim 1 ;
a cathode including a cathode active material; and
a non-aqueous electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Choi Hee Seon
• Kim Sangpil
• Kim Youngugk
• Kwak Jiyeon
• Kim Yeongap

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M4/364

  as mixtures · CPC title