Electrode for secondary batteries, and secondary battery

Patent metadata

Field	Value
Publication number	US-12597591-B2
Application number	US-202017785633-A
Country	US
Kind code	B2
Filing date	Dec 21, 2020
Priority date	Dec 25, 2019
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

The purpose of the present disclosure is to improve the cycle characteristics of a secondary battery. An electrode for secondary batteries according to one example of the embodiments of the present disclosure is provided with a core body and a mixture layer that is formed on the surface of the core body. The mixture layer comprises a plurality of high-density regions and a plurality of low-density regions; and the high-density regions and the low-density regions are alternately arranged in a first direction of the mixture layer, while extending in a second direction that is perpendicular to the first direction, thereby forming stripes. It is preferable that there are three or more high-density regions and three or more low-density regions.

First claim

The invention claimed is:

1 . A secondary battery, comprising:
an electrode assembly that includes:
at least a negative electrode that includes:
a core, wherein the electrode assembly is a wound electrode assembly in which the negative electrode for the secondary battery is spirally wound; and
a mixture layer formed on a surface of the core, wherein
the mixture layer includes high density regions and low density regions,
the high density regions and the low density regions are alternately arranged in a first direction of the mixture layer, extend in a second direction perpendicular to the first direction, and are formed in a stripe shape,
the first direction is perpendicular to a thickness direction of the core and along with an axial direction of the electrode assembly which is a width direction of the negative electrode,
each of the high density regions and the low density regions includes an active material and a binder, and
a density of each of the low density regions and a density of each of the high density regions satisfy
0.85≤ the density of each of the low density regions/the density of each of the high density regions <0.95;

an electrolyte solution; and an outer body housing the electrode assembly.

2 . The secondary battery according to claim 1 , wherein respective numbers of the high density regions and the low density regions are three or more.

3 . The secondary battery according to claim 2 , wherein a width of each of the high density regions and a width of each of the low density regions in the first direction are equal to each other.

4 . The secondary battery according to claim 2 , wherein a width of each of the low density regions in the first direction is wider than a width of each of the high density regions in the first direction.

Assignees

• Sanyo Electric Co Ltd
• Panasonic Energy Co Ltd

Inventors

• Akira Tatsuya
• Sugaya Junichi

Classifications

• H01M10/0587

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

• H01M4/366

  as layered products · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title