Electrode, secondary battery, and electrode manufacturing method

Patent metadata

Field	Value
Publication number	US-2023238501-A1
Application number	US-202217981017-A
Country	US
Kind code	A1
Filing date	Nov 4, 2022
Priority date	Jan 11, 2022
Publication date	Jul 27, 2023
Grant date	—

Abstract

An electrode includes an active material layer. The active material layer is provided with a first groove portion and a second groove portion on a surface. The first groove portion has a first depth. The second groove portion has a second depth. The second depth is shallower than the first depth. Each of the first groove portion and the second groove portion extends linearly along the surface of the active material layer. The second groove portion is adjacent to the first groove portion.

First claim

What is claimed is:

1 . An electrode comprising:
an active material layer, wherein:
the active material layer is provided with a first groove portion and a second groove portion on a surface;
the first groove portion has a first depth;
the second groove portion has a second depth;
the second depth is shallower than the first depth;
each of the first groove portion and the second groove portion extends linearly along the surface of the active material layer; and
the second groove portion is adjacent to the first groove portion.

2 . The electrode according to claim 1 , wherein:
the active material layer is provided with a plurality of first groove portions and a plurality of second groove portions on the surface; and in planar view, the first groove portions and the second groove portions are alternately provided.

3 . The electrode according to claim 1 , wherein a ratio of the first depth to the second depth is within a range of 2 to 370.

4 . The electrode according to claim 1 , wherein:
the first groove portion has a first width; the second groove portion has a second width; and a ratio of the second width to the first width is within a range of 10 to 100.

5 . The electrode according to claim 1 , further comprising a base material, wherein the active material layer is arranged on a surface of the base material.

6 . A secondary battery comprising:
the electrode according to claim 1 ; and an electrolytic solution.

7 . An electrode manufacturing method comprising:
manufacturing an electrode by forming an active material layer; and forming a first groove portion and a second groove portion on a surface of the active material layer, wherein:
the first groove portion has a first depth;
the second groove portion has a second depth;
the second depth is shallower than the first depth;
each of the first groove portion and the second groove portion extends linearly along the surface of the active material layer; and
the second groove portion is adjacent to the first groove portion.

8 . The electrode manufacturing method according to claim 7 , wherein:
the forming of the first groove portion and the second groove portion includes pressing a concave-convex mold against the surface of the active material layer; the concave-convex mold includes a convex portion and a concave portion; the concave portion is adjacent to the convex portion; and the convex portion is pressed against the surface of the active material layer such that a gap is formed between the concave portion and the surface of the active material layer.

9 . The electrode manufacturing method according to claim 7 , wherein:
the forming of the first groove portion and the second groove portion includes irradiating the surface of the active material layer with a laser beam; the first groove portion is formed by cutting the active material layer by the laser beam; and a protrusion portion is formed by depositing shavings of the active material layer, adjacent to the first groove portion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Shionoya Haruka
• Kintsu Yusuke
• Mimura Tetsuya
• Kondo Takeshi
• Kawamoto Yuta

Classifications

• H01M4/13 Primary

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

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/0525

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

• B23K26/38

  by boring or cutting · CPC title

• H01M2004/021

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