Electrode structure and secondary battery

Patent metadata

Field	Value
Publication number	US-2020006731-A1
Application number	US-201916455991-A
Country	US
Kind code	A1
Filing date	Jun 28, 2019
Priority date	Jul 2, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

According to one embodiment, an electrode structure is provided. The electrode structure includes an electrode and a separator. The electrode includes an active material-containing layer. The separator includes a layer provided on a main surface of the active material-containing layer. The layer includes organic fibers and a resin mass. The resin mass is in contact with a portion of the main surface of the active material-containing layer. The resin mass is integrated with a portion of the organic fibers. When a length of the resin mass is represented by a circumscribed quadrilateral of the resin mass, a length of a first side of the circumscribed quadrilateral and a length of a second side adjacent to the first side are each 10 μm or more.

First claim

What is claimed is:

1 . An electrode structure comprising:
an electrode comprising an active material-containing layer; and a separator comprising a layer provided on a main surface of the active material-containing layer, wherein the layer comprises organic fibers and a resin mass, the resin mass is in contact with a portion of the main surface of the active material-containing layer and is integrated with a portion of the organic fibers, and when a length of the resin mass is represented by a circumscribed quadrilateral of the resin mass, a length of a first side of the circumscribed quadrilateral and a length of a second side adjacent to the first side are each 10 μm or more.

2 . The electrode structure according to claim 1 , wherein the main surface of the active material-containing layer includes a concave portion and at least a portion of the resin mass is positioned in the concave portion.

3 . The electrode structure according to claim 1 , wherein the main surface of the active material-containing layer has a rectangular shape and comprises a first region, a second region, and a third region in the main surface of the active material-containing layer,
the first region is positioned at one end parallel to a long side direction of the main surface of the active material-containing layer and occupies a quarter area on the main surface of the active material-containing layer, the second region is positioned at an opposite end of the first region and occupies a quarter area on the main surface of the active material-containing layer, and the third region is positioned between the first region and the second region and occupies a half area on the main surface of the active material-containing layer, and the resin mass is positioned on at least one of the first region and the second region.

4 . The electrode structure according to claim 3 , wherein a ratio of an area of the resin mass in the first region or the second region of the active material-containing layer is 0.3% or more.

5 . The electrode structure according to claim 3 , wherein the resin mass is further positioned on the third region, and a ratio of an area of the resin mass in the third region of the active material-containing layer is 0.2% or more.

6 . The electrode structure according to claim 1 , wherein the resin mass comprises at least one organic material selected from the group consisting of polyamide imide, polyamide, polyolefin, polyether, polyimide, polyketone, polysulfone, cellulose, polyvinyl alcohol, and polyvinylidene fluoride.

7 . The electrode structure according to claim 1 , wherein the organic fibers comprise at least one organic material selected from the group consisting of polyamide imide, polyamide, polyolefin, polyether, polyimide, polyketone, polysulfone, cellulose, polyvinyl alcohol, and polyvinylidene fluoride.

8 . The electrode structure according to claim 1 , wherein at least one length of the first side and the second side is from 15 μm to 45 μm.

9 . The electrode structure according to claim 1 , wherein the active material-containing layer contains active material particles having an average particle size of 0.1 μm to 10 μm.

10 . The electrode structure according to claim 1 , further comprising an intermediate layer that is provided between the active material-containing layer and the separator and is insulating, wherein the resin mass is in contact with a portion of the main surface of the intermediate layer.

11 . A secondary battery comprising:
the electrode structure according to claim 1 ; an electrode facing the electrode structure; and an electrolyte.

Assignees

• Toshiba Kk

Inventors

• Tokuno Yoko
• Uematsu Ikuo

Classifications

• H01M4/13

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

• H01M2200/30

  Preventing polarity reversal · CPC title

• H01M10/0525

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

• H01M2/168

  Electricity · mapped topic

• H01M2/1666

  Electricity · mapped topic