Battery electrode

Patent metadata

Field	Value
Publication number	US-12283686-B2
Application number	US-202117462370-A
Country	US
Kind code	B2
Filing date	Aug 31, 2021
Priority date	Mar 17, 2021
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer and a current collector. The active material-containing layer comprises a first edge having an arc shape and a second edge positioned opposite to the first edge. The current collector comprises an active material-supporting section supporting the active material-containing layer, and an active material-non-supporting section. The curving amount is represented by a maximum distance from the first edge to a reference line connecting two points on the first edge. The curving amount is in a range of −1 mm or more and less than 0 mm.

First claim

What is claimed is:

1. An electrode, comprising:
an active material-containing layer comprising a first edge having an arc shape and a second edge positioned opposite to the first edge, the active material-containing layer comprising an electrode active material; and
a current collector comprising an active material-supporting section supporting the active material-containing layer, and an active material-non-supporting section which is adjacent to the active material-supporting section and the second edge and is not provided with the active material-containing layer,
wherein
at least one surface of the current collector comprises the active material-supporting section and the active material-non-supporting section,
the active material-containing layer comprises a surface defined by the first edge and the second edge, the surface being supported by the active material-supporting section,
when
a curving amount in a plane of the active material-containing layer is represented by a maximum distance from the first edge to a reference line connecting two points on the first edge,
the two points are spaced apart from each other at a straight-line distance of 1000 mm, and
the curving amount in a direction from the first edge toward the second edge is represented by a positive value, and

the curving amount is in a range of −1 mm or more and less than 0 mm.

2. The electrode according to claim 1 , wherein the current collector comprises aluminum.

3. The electrode according to claim 1 , wherein a width of the active material-containing layer between the first edge and the second edge is from 60 mm to 250 mm, and a width of the active material-non-supporting section in a direction intersecting with the second edge is from 5 mm to 25 mm.

4. The electrode according to claim 1 , wherein a mass per unit area of the active material-containing layer on the active material-supporting section is from 100 g/m 2 to 300 g/m 2 for each surface of the current collector.

5. The electrode according to claim 1 , wherein the curving amount is in a range of −1 mm or more and −0.05 mm or less.

6. The electrode according to claim 1 , wherein the curving amount is an amount of curve when producing the electrode.

7. The electrode according to claim 1 , wherein the curving amount is determined before producing an electrode group comprising the electrode.

Assignees

• Toshiba Kk

Inventors

• Kanai Yuta
• Yamashita Yasunobu
• Yoshima Kazuomi
• Hoshina Keigo
• Sasakawa Tetsuya
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M10/0525 Primary

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

• H01M2004/021

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

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M2004/025

  with shapes other than plane or cylindrical · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title