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

Patent metadata

Field	Value
Publication number	US-11728507-B2
Application number	US-201816493557-A
Country	US
Kind code	B2
Filing date	Nov 9, 2018
Priority date	Nov 9, 2017
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

An electrode for a rechargeable battery in which a current collector is coated with an electrode mixture including an electrode active material and a binder includes a first electrode composite layer including PVdF as a first binder and an electrode active material and applied on a current collector; and a second electrode composite layer including a second binder and an electrode active material and applied on the first electrode composite layer, wherein crystallinity of the first binder is 58 or greater.

First claim

The invention claimed is:

1. A method for manufacturing the electrode for a rechargeable battery in which a current collector is coated with an electrode mixture including an electrode active material and a binder, the method comprising:
(i) applying a first slurry including PVdF as a first binder and a first electrode active material to a current collector, subsequently firstly drying the slurry at 120 to 140° C. under an air atmosphere for about 2 minutes to 5 minutes, and secondly drying the slurry at 150 to 190° C. in a vacuum state to form a first electrode composite layer for about 12 hours to 30 hours; and
(ii) applying a second slurry including a second binder and a second electrode active material to the first electrode composite layer and subsequently drying the slurry at 120 to 140° C. under an air atmosphere for about 2 minutes to 5 minutes to form a dried slurry and rolling the dried slurry to form a second electrode composite layer,
wherein crystallinity of the first binder is 58% or greater, and the second binder has crystallinity of less than 58%.

2. The method of claim 1 , wherein the second binder is PVdF.

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

4. The method of claim 1 , wherein a thickness of the first electrode composite layer is 5 to 45% of a thickness of the second electrode composite layer.

5. The method of claim 1 , wherein a compound of the first electrode active material of the first electrode composite layer and a compound of the second electrode active material of the second electrode composite layer are the same.

6. The method of claim 1 , wherein a content of the first binder and a content of the second binder are 1 to 15 wt % with respect to a total weight of each of the first and second electrode composite layers, respectively.

7. The method of claim 1 , wherein the first electrode composite layer and the second electrode composite layer each further comprises a conductive material having electronic conductivity.

8. The method of claim 1 , 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 first binder and the second binder.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Park Junsoo
• Lee Taek Soo
• Oh Song Taek

Classifications

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/4235

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

• H01M4/13

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

• H01M10/058 Primary

  Construction or manufacture · CPC title