Electrode and a rechargeable lithium battery including the electrode

Patent metadata

Field	Value
Publication number	US-11430987-B2
Application number	US-201916711114-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 12, 2018
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

Disclosed are an electrode for a rechargeable lithium battery and a rechargeable lithium battery. The electrode includes a current collector, a first active material layer, and a second active material layer. The first active material layer is formed on the current collector and includes a first active material. The second active material layer is formed on the first active material layer. The second active material layer includes a second active material having an active material and a meltdown polymer disposed on the surface of the active material.

First claim

What is claimed is:

1. An electrode for a rechargeable lithium battery, comprising:
a current collector;
a first active material layer formed on the current collector and including a first active material; and
a second active material layer formed on the first active material layer wherein the second active material layer includes a second active material including an active material and a meltdown polymer disposed on a surface of the active material,
wherein the meltdown polymer is disposed on the surface of the active material with an area of about 0.1% to about 80% relative to 100% of a surface area of the active material,
wherein the meltdown polymer is disposed in a shape of a plurality of spines attached to the surface of the active material.

2. An electrode for a rechargeable lithium battery, comprising
a current collector;
a first active material layer formed on the current collector and including a first active material; and
a second active material layer formed on the first active material layer wherein the second active material layer includes a second active material including an active material and a meltdown polymer disposed on a surface of the active material,
wherein the meltdown polymer is disposed on the surface of the active material with an area of about 0.1% to about 80% relative to 100% of a surface area of the active material,
wherein a thickness of the second active material layer is about 2 μm to about 8 μm, and
wherein the meltdown polymer comprises a plurality of spines and a length of each spine of the meltdown polymer is about 0.5 μM to about 10 μm.

3. The electrode of claim 2 , wherein the meltdown polymer is disposed in a cluster of lumps on the surface of the active material.

4. The electrode of claim 2 , wherein the meltdown polymer comprises polyethylene, polypropylene, polymethylmethacrylate, poly(1-butene), polyimide, or a combination thereof.

5. The electrode of claim 2 , wherein the meltdown polymer comprises polyethylene.

6. The electrode of claim 2 , wherein the meltdown polymer is present in an amount of about 0.1 wt % to about 5.5 wt % based on a total weight of the second active material.

7. The electrode of claim 2 , wherein the meltdown polymer is attached to the surface of the active material via a binder.

8. The electrode of claim 2 , wherein the meltdown polymer comprises a plurality of particles and each particle of the meltdown polymer has a major axis length of about 1 μm to about 10 μm.

9. The electrode of claim 2 , wherein a thickness of the second active material layer is about 0.1% to about 30% relative to 100% of the entire thickness of the first active material layer and the second active material layer.

10. The electrode of claim 2 , wherein the electrode is a positive electrode or a negative electrode.

11. The electrode of claim 2 , wherein the electrode is a negative electrode.

12. The electrode of claim 2 , wherein the first active material and the active material are the same.

13. The electrode of claim 2 , wherein the active material is a positive active material comprising a lithiated intercalation compound.

14. The electrode of claim 13 , wherein the lithiated intercalation compound comprises LiCoO 2 .

15. The electrode of claim 2 , wherein the active material is a negative active material comprising graphite.

16. A rechargeable lithium battery comprising:
a first electrode according to the electrode of claim 2 ;
a second electrode; and
an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Kyuseo
• Yoo Heeeun
• Yoon Yeonhee
• Ha Jaehwan
• Kim Kijun

Classifications

• H01M50/581

  in response to temperature · CPC title

• H01M4/602

  Polymers · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title