Power storage device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2016372273-A1
Application number	US-201615256737-A
Country	US
Kind code	A1
Filing date	Sep 6, 2016
Priority date	Mar 28, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

A power storage device has a power storage element and an electrolytic solution. The power storage element includes an anode body, a cathode body opposed to the anode body, and a separator interposed between the anode body and the cathode body. The separator includes a separator base material and a conductive polymer deposited on the separator base material. The power storage element is impregnated with the electrolytic solution. The separator has a first surface layer, which includes a first surface opposed to the anode body, and a second surface layer, which includes a second surface opposed to the cathode body. The first surface layer has a first region in which the conductive polymer is deposited, and the second surface layer has a second region in which the conductive polymer is not deposited.

First claim

What is claimed is:

1 . A power storage device comprising a power storage element and an electrolytic solution, the power storage element being impregnated with the electrolytic solution,
the power storage element includes:
an anode body;
a cathode body opposed to the anode body; and
a separator having a separator base material and a conductive polymer deposited on the separator base material, the separator being interposed between the anode body and the cathode body;
wherein: the separator has
a first surface layer including a first surface opposed to the anode body and
a second surface layer including a second surface opposed to the cathode body,
the first surface layer has a first region in which the conductive polymer is deposited, and the second surface layer has a second region in which the conductive polymer is not deposited.

2 . The power storage device according to claim 1 , wherein:
the second surface layer has a third region in which the conductive polymer is deposited, and an opposed area of the first region in the first surface layer with respect to the anode body is larger than an opposed area of the third region in the second surface layer with respect to the cathode body.

3 . The power storage device according to claim 1 , wherein:
the second surface layer has a third region in which the conductive polymer is deposited, and an amount of the -conductive polymer deposited in a first separator half body is greater than an amount of the conductive polymer deposited in a second separator half body, where a part from a center of the separator in thickness direction to the first surface is defined as the first separator half body, and a part from the center of the separator in thickness direction to the second surface is defined as the second separator half body.

4 . The power storage device according to claim 1 , wherein:
the separator base material includes paper or an unwoven fabric each containing an electrically non-conductive fiber, and the conductive polymer is deposited on the electrically non-conductive fiber.

5 . The power storage device according to claim 4 , wherein a density of the electrically non-conductive fiber in the first surface layer is lower than a density of the electrically non-conductive fiber in the second surface layer.

6 . The power storage device according to claim 4 , wherein a density of the electrically non-conductive fiber in the second surface layer is lower than a density of the electrically non-conductive fiber in the first surface layer.

7 . The power storage device according to claim 1 , wherein:
the second surface layer has a third region in which the conductive polymer is deposited, the separator has an intermediate layer between the first surface layer and the second surface layer, the intermediate layer has a fourth region in which the conductive polymer is deposited, and the conductive polymer deposited in the first region of the first surface layer and the conductive polymer deposited in the third region of the second surface layer are electrically connected to each other via the conducive polymer deposited in the fourth region of the intermediate layer.

8 . The power storage device according to claim 1 , wherein a deposition amount of the conductive polymer, which is deposited on the separator base material on the first surface, per a unit area of the separator base material is greater than a deposition amount of the conductive polymer, which is deposited on the separator base material on the second surface, per the unit area of the separator base material.

9 . The power storage device according to claim 1 , wherein:
the anode body includes anode foil on which a dielectric film is formed, the cathode body includes cathode foil, and the power storage element is a capacitor element having the anode foil and the cathode foil wound with the separator interposed between the anode foil and the cathode foil.

10 . The power storage device according to claim 9 , wherein:
the first surface layer has a fifth region in which the conductive polymer is not deposited, the anode body has an anode lead connected to the anode foil, and the fifth region is provided at a position opposed to a connecting location of the anode foil and the anode lead.

11 . The power storage device according to claim 9 , wherein:
the first surface layer has a fifth region in which the conductive polymer is not deposited, and the fifth region is provided at a position opposed to an edge of the anode foil, the edge being along a winding direction.

12 . The power storage device according to claim 9 , wherein
the first surface layer has a fifth region in which the conductive polymer is not deposited, and the fifth region is provided at least either one of a position opposed to a winding-start edge of the anode foil and a position opposed to a winding-end edge of the anode foil.

13 . The power storage device according to claim 1 , wherein:
a dielectric film is formed on a surface of the anode body, and the power storage element is a capacitor element having the anode body, the separator, and the cathode body stacked.

14 . The power storage device according to claim 13 , wherein:
the first surface layer has a fifth region in which the conductive polymer is not deposited, and the fifth region is provided at a position opposed to an edge of the anode body.

15 . A method of manufacturing a power storage device, the method comprising:
applying a liquid agent serving as a solution or dispersion liquid of a conductive polymer to a first surface or to a second surface of a separator base material to cause the liquid agent to permeate interior of the separator base material and then vaporizing at least part of a solvent or a dispersion medium contained in the liquid agent to form a separator having the conductive polymer deposited on the separator base material; causing an anode to be opposed to the first surface of the separator and causing a cathode to be opposed to the second surface of the separator to form a power storage element; and impregnating the power storage element with an electrolytic solution, wherein, when the separator is formed, a first region in which the conductive polymer is deposited is formed in a first surface layer including the first surface, and a second region in which the conductive polymer is not deposited is formed in a second surface layer including the second surface.

16 . The method of manufacturing the power storage device according to claim 15 , wherein an area of an applied region of the liquid agent in the first surface is larger than an area of an applied region of the liquid agent in the second surface.

17 . The method of manufacturing the power storage device according to claim 15 , wherein, when the separator is formed, the liquid agent is applied to the separator base material by a printing method.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kubo Daisuke
• Takahashi Masayuki
• Shimasaki Yukihiro
• Tashiro Tomoyuki
• Aoyama Tatsuji

Classifications

• H01G9/151

  with wound foil electrodes · CPC title

• H01G9/028

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• H01G9/035

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G9/02 Primary

  Diaphragms; Separators · CPC title

• H01G11/58

  Liquid electrolytes · CPC title