Electrode and Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2022320518-A1
Application number	US-202017608894-A
Country	US
Kind code	A1
Filing date	Sep 29, 2020
Priority date	Oct 4, 2019
Publication date	Oct 6, 2022
Grant date	—

Abstract

The present invention relates to an electrode and a secondary battery including the same, the electrode including an electrode active material layer, the electrode active material layer including an electrode active material and a conductive agent, the conductive agent including: a multi-walled carbon nanotube unit; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, wherein the carbon nanotube structure is contained in the electrode active material layer in an amount of 0.01 wt % to 0.5 wt %.

First claim

1 . An electrode comprising an electrode active material layer, the electrode active material layer comprising an electrode active material and a conductive agent, the conductive agent comprising: a multi-walled carbon nanotube unit; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other,
wherein the carbon nanotube structure is contained in the electrode active material layer in an amount of 0.01 wt % to 0.5 wt %.

2 . The electrode of claim 1 , wherein a weight ratio of the multi-walled carbon nanotube unit to the carbon nanotube structure is 100:1 to 100:200.

3 . The electrode of claim 1 , wherein the multi-walled carbon nanotube unit is contained in the electrode active material layer in an amount of 0.1 wt % to 1.0 wt %.

4 . The electrode of claim 1 , wherein multiple carbon nanotube structures are connected to each other to represent a network structure in the electrode.

5 . The electrode of claim 1 , wherein, in the carbon nanotube structure, the single-walled carbon nanotube units are arranged side by side and bonded.

6 . The electrode of claim 1 , wherein the carbon nanotube structure has an average length of 1 μm to 500 μm.

7 . The electrode of claim 1 , wherein the carbon nanotube structure has an average length of 10 μm to 70 μm.

8 . The electrode of claim 1 , wherein the carbon nanotube structure has an average diameter of 2 nm to 200 nm.

9 . The electrode of claim 1 , wherein the carbon nanotube structure has an average diameter of 50 nm to 120 nm.

10 . The electrode of claim 1 , wherein, in the carbon nanotube structure, the single-walled carbon nanotube unit has an average diameter of 0.5 nm to 5 nm.

11 . The electrode of claim 1 , wherein the multi-walled carbon nanotube unit has an average diameter of 5 nm to 200 nm.

12 . The electrode of claim 1 , wherein the multi-walled carbon nanotube unit has an average length of 0.1 μm to 100 μm.

13 . The electrode of claim 1 , wherein the carbon nanotube structure is a carbon nanotube structure in which 50 to 4,000 single-walled carbon nanotube units are bonded to each other.

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

15 . A secondary battery comprising the electrode of claim 1 , a separator, and an electrolyte.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Tae Gon
• Cho Hyung Man
• Moon Il Jae
• Park Sun Wook
• Kwak Min

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title