Electrode and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12211994-B2
Application number	US-202017424148-A
Country	US
Kind code	B2
Filing date	Jan 31, 2020
Priority date	Feb 1, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Provided an electrode for secondary batteries, the electrode including: a substrate; and a plurality of active material layers arranged on the substrate and each including an active material, wherein at least one of the plurality of active material layers includes a binder, and a content of the binder is about 1.0 part by weight to about 1.7 parts by weight based on 100 parts by weight of a total weight of the plurality of active material layers.

First claim

The invention claimed is:

1. An electrode for secondary batteries, the electrode comprising:
a substrate; and
a plurality of active material layers arranged on the substrate and each including an active material,
the plurality of active material layers include a first active material layer and a second active material layer,

the second active material layer is disposed between the substrate and the first active material layer,
the first active material layer and the second active material layer include a binder in a weight ratio more than 5:5 and 0:10 or less,
a thickness ratio of the first active material layer and the second active material layer is 7:3 to 5:5; and
a content of the binder is 1.0 part by weight to 1.7 parts by weight based on 100 parts by weight of a total weight of the plurality of active material layers.

2. The electrode of claim 1 , wherein the binder is non-uniformly distributed in at least one active material layer.

3. The electrode of claim 1 , wherein
the substrate includes a conductive substrate, and
the binder has a concentration gradient that decreases as a distance from the substrate increases.

4. The electrode of claim 1 , wherein the first active material layer and the second active material layer include a binder in a weight ratio of more than 5:5 and 1:9 or less.

5. The electrode of claim 1 , wherein a content of the binder is 1 part by weight to 3 parts by weight based on 100 parts by weight of a total weight of the second active material layer.

6. The electrode of claim 1 , wherein each of thicknesses of the first active material layer and the second active material layer is 60 μm to 210 μm, and thicknesses of the first active material layer and the second active material layer are the same or different.

7. The electrode of claim 1 , wherein
a thickness of the first active material layer is 100 μm to 210 μm, and
a thickness of the second active material layer is 60 μm to 150 μm.

8. A secondary battery comprising the electrode of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Seok Hoon
• Bae Juhye
• Ahn Wongi

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/622

  being polymers · CPC title

• H01M2004/028

  Positive electrodes · CPC title