An Electrode for an Electrochemical Device and an Electrochemical Device Comprising the Same

Patent metadata

Field	Value
Publication number	US-2024162446-A1
Application number	US-202218279343-A
Country	US
Kind code	A1
Filing date	Sep 8, 2022
Priority date	Sep 9, 2021
Publication date	May 16, 2024
Grant date	—

Abstract

The present disclosure provides an electrode for an electrochemical device comprising an electrode current collector, a conductive polymer layer that is located on at least one surface of the electrode current collector; and an electrode active material layer that is located on an upper surface of the conductive polymer layer and includes an electrode active material and a binder polymer, wherein the conductive polymer layer includes a poly(thiophene)-based polymer represented by Chemical Formula 1:wherein R1 to R4, m and n are describe herein.

First claim

1 . An electrode for an electrochemical device comprising:
an electrode current collector; a conductive polymer layer that is located on at least one surface of the electrode current collector; and an electrode active material layer that is located on an upper surface of the conductive polymer layer and includes an electrode active material and a binder polymer, wherein the conductive polymer layer includes a poly(thiophene)-based polymer represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
R 1 , R 2 , R 3 and R 4 are each independently hydrogen or a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, and at least one of a total number of carbon atoms of R 1 and R 2 or a total number of carbon atoms of R 3 and R 4 is 3 or more,
m and n are each independently an integer of 0 to 20,000, and m+n>0, and
when m and n are each 1 or above,

are different from each other.

2 . The electrode for an electrochemical device according to claim 1 , wherein:
an adhesive strength between the conductive polymer layer and the electrode current collector is 200 gf/20 mm or more.

3 . The electrode for an electrochemical device according to claim 1 , wherein:
an interface resistance between the conductive polymer layer and the electrode active material layer is 3.0 ohm·cm 2 or less.

4 . The electrode for an electrochemical device according to claim 1 , wherein:
at least one of a total number of carbon atoms of R 1 and R 2 or a total number of carbon atoms of R 3 and R 4 is 5 or more.

5 . The electrode for an electrochemical device according to claim 1 , wherein:
the m or n is 0.

6 . The electrode for an electrochemical device according to claim 1 , wherein:
the conductive polymer layer has a thickness of 0.1 μm to 8 μm.

7 . The electrode for an electrochemical device according to claim 1 , wherein:
the conductive polymer layer further comprises a poly(aniline)-based polymer; a poly(pyrrole)-based polymer; a poly(phenylene)-based polymer; poly(acetylene)-based polymer; derivatives thereof; or two or more kinds thereof.

8 . The electrode for an electrochemical device according to claim 1 , wherein:
the electrode is a positive electrode.

9 . An electrochemical device comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode,
wherein the positive electrode or the negative electrode comprises the electrode for an electrochemical device according to claim 1 .

10 . The electrode for an electrochemical device according to claim 1 , wherein the poly(thiophene)-based polymer has a weight average molecular weight (Mw) of 10,000 g/mol to 100,000 g/mol.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kwon Soon-Ho
• Kim Min-Gyu
• Park Sung-Bin
• Cho Woo-Hyung

Classifications

• H01M4/624 Primary

  Electric conductive fillers · CPC title

• H01M4/366

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01G11/28 Primary

  arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title