Multi-layered electrode for rechargeable battery including binder having high crystallinity

Patent metadata

Field	Value
Publication number	US-11094961-B2
Application number	US-201816493472-A
Country	US
Kind code	B2
Filing date	Nov 9, 2018
Priority date	Nov 9, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

An electrode for a rechargeable battery, includes: a primer coating layer including PVdF as a first binder and a conductive material formed on a current collector; and an electrode composite layer including a second binder and an electrode active material formed on the primer coating layer, wherein crystallinity of the first binder is 58 or greater.

First claim

The invention claimed is:

1. An electrode for a rechargeable battery, comprising:
a primer coating layer including PVdF as a first binder and a conductive material, wherein the primer coating layer is formed directly on a current collector; and
an electrode composite layer including a second binder and an electrode active material, wherein the electrode composite layer is formed directly on the primer coating layer,
wherein crystallinity of the first binder is 58% or greater.

2. The electrode of claim 1 , wherein:
the second binder has crystallinity of less than 58%.

3. The electrode of claim 1 , wherein
the electrode is a positive electrode.

4. The electrode of claim 1 , wherein:
a thickness of the primer coating layer is 1 to 10% of a thickness of the electrode composite layer.

5. The electrode of claim 1 , wherein:
a content of the first binder in the primer coating layer is 30 to 80 wt % with respect to a total weight of the primer coating layer, and a content of the second binder in the electrode composite layer is 1 to 15 wt % with respect to a total weight of the electrode composite layer.

6. The electrode of claim 1 , wherein:
a content of the conductive material in the primer layer is 20 parts by weight to 100 parts by weight based on 100 parts by weight of the first binder.

7. The electrode of claim 1 , wherein:
the electrode composite layer further includes a conductive material having electronic conductivity.

8. The electrode of claim 7 , wherein:
a content of the conductive material is 20 parts by weight to 100 parts by weight based on 100 parts by weight of the second binder.

9. The electrode of claim 1 , wherein:
the second binder is PVdF.

10. A method for manufacturing the electrode for a rechargeable battery of claim 1 , comprising:
(i) applying a primer slurry including a first binder and a conductive material to a current collector, subsequently firstly drying the primer slurry at 120 to 140° C. under an air atmosphere, and secondly drying the primer slurry at 150 to 190° C. in a vacuum state to form a primer coating layer; and
(ii) applying a slurry including a second binder and an electrode active material to the primer coating layer and subsequently drying the slurry at 120 to 140° C. under an air atmosphere to form a dried slurry and rolling the dried slurry to form an electrode composite layer.

11. A lithium rechargeable battery including the electrode of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Park Junsoo
• Kim Su Hyun
• Lee Taek Soo
• Oh Song Taek

Classifications

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M2004/021

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

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title