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Electrochemical device

An electrochemical and electrode technology, applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of short circuit between electrodes, deterioration of uniformity, large leakage current between electrodes, etc., and achieve the effect of less leakage current and higher uniformity

Active Publication Date: 2006-10-04
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the inventors of the present invention found that when the thickness of the conventional separator made of nonwoven fabric is reduced to, for example, 20 μm or less, the uniformity of the separator in the in-plane direction is deteriorated, roughness is likely to occur, and leakage current between electrodes In addition, the active material particles detached from the electrodes enter the pinholes of the separator, and the electrodes may be short-circuited

Method used

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  • Electrochemical device
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Examples

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Effect test

Embodiment 1

[0045] The electric double layer capacitor of Example 1 was fabricated in the following manner.

[0046]

[0047] Activated carbon is used as an active material, carbon black is used as a conductive additive, and PVDF is used as a binder, and these materials are mixed so that the active material: conductive additive: binder = 87:3:10, and N is added to the resulting mixture. -Methylpyrrolidone, kneading, thereby preparing a paint. The average particle diameter Dp of the activated carbon was 4 μm.

[0048] After coating this paint on one surface of the etched aluminum foil by a doctor blade method, the aluminum foil was dried at 100° C. for 30 minutes in the air. The aluminum foil was calendered using a roll press, and then, centered on the coating film formation area, the aluminum foil was punched out with a hole of 7.8×7.8 mm having a tab portion to obtain an electrode for an electric double layer capacitor.

[0049]

[0050] A nonwoven fabric made of polyacrylonitrile wi...

Embodiment 2

[0054] In Example 2, an electric double layer capacitor was obtained in the same manner as in Example 1, except that a nonwoven fabric made of polyacrylonitrile having a thickness T of 20 μm and a fiber diameter D of 1 μm was used as the separator.

Embodiment 3

[0056] In Example 3, an electric double layer capacitor was obtained in the same manner as in Example 1, except that a nonwoven fabric made of polyacrylonitrile having a thickness T of 5 μm and a fiber diameter D of 0.1 μm was used as the separator.

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Abstract

In an electrochemical device 100 comprising a multilayer body 20 having a separator 18 and a pair of electrodes 10, 10 disposed so as to hold the separator 18 therebetween, and an electrolyte infiltrated in the multilayer body 20; the electrodes 10, 10 contain an active material particle; the separator 18 is made of a nonwoven fabric having an average fiber diameter Df of 0.1 to 1.0 mum; T>=5 mu m and T / Df>=20, where T is the thickness of the separator 18; and Dp<T, where Dp is the average particle size of the active material particle.

Description

technical field [0001] The invention relates to an electrochemical device. Background technique [0002] The electric double layer capacitor includes a laminate having a separator and a pair of electrodes provided with the separator interposed therebetween, a packaging bag for accommodating the laminate, and an electrolytic solution impregnated in the laminate. [0003] The separator is an insulating and porous material for preventing contact between electrodes and ensuring flow of ions (for example, refer to JP-A-10-256088). [0004] In such an electrochemical device such as an electric double layer capacitor, further thinning is required. In order to reduce the thickness without reducing the capacity of the electrochemical device, etc., it is considered preferable to make the separator thinner. As a separator, nonwoven fabrics are often used. [0005] However, the inventors of the present invention found that when the thickness of the conventional separator made of nonw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01G9/058H01G9/155H01G11/22H01G11/24H01G11/38H01G11/42H01G11/52H01G11/86H01M2/16
CPCH01G9/02Y02E60/13
Inventor 高桥哲哉大桥良彦
Owner TDK CORP
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