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Granules for electrode, method for manufacturing thereof, electrode sheet, polarizable electrode and electric double-layer capacitor
| Details |
Inventors: Iwaida, Manabu; Oyama, Shigeki; Murakami, Kenichi;
Assignee: Honda Motor Co., Ltd. (Tokyo, JP)
Primary Examiner: Reichard; Dean A.
Assistant Examiner: Thomas; Eric
Attorney, Agent or Firm: Arent Fox PLLC
An electrode sheet for an electric double-layer capacitor is provided. The electrode sheet is molded from granules which are produced from ingredients including an electrochemically active material, an electrically conductive filler and a binder. A contact angle is equal to or less than 100 degrees when the contact angle is defined as (180-ALPHA) degrees, where ALPHA represents an apex angle of a droplet of an electrolytic solution for the electric double-layer capacitor, and when the droplet lies on the electrode sheet. |
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DETAILED DESCRIPTION In the circumstances, the present invention provides an electrode sheet and its manufacturing method, which enable manufacturing of this type of electric double-layer capacitor.
The present invention also provides a polarizable electrode including the electrode sheet and the electric double-layer capacitor using the polarizable electrode.
Applicants have found that a contact angle between an electrode sheet and a droplet of electrolytic solution can be controlled so that an electric double-layer capacitor can have low electrical resistance and stable performance.
The applicants have also discovered that the desirable contact angle can be obtained by manufacturing the granules for electrode sheet under preferably selected conditions of process associated with kneading.
An aspect of the present invention provides an electrode sheet for an electric double-layer capacitor, and the electrode sheet is molded from granules which are produced from ingredients including an electrochemically active material, an electrically conductive filler and a binder.
In this aspect, a contact angle is equal to or less than 100 degrees when the contact angle is defined as (180-ALPHA) degrees, where ALPHA represents an apex angle of a droplet of an electrolytic solution for the electric double-layer capacitor, and when the droplet lies on the electrode sheet.
In this way, it is possible to obtain the electrode sheet described above, which can be used for the electric double-layer capacitor having stable performance and low electrical resistance due to improvement in wetness.
Another aspect of the present invention provides a method for manufacturing an electrode sheet for an electric double-layer capacitor.
The electrode sheet is molded from granules which are produced from ingredients including an electrochemically active material, an electrically conductive filler and a binder.
The method includes the steps of (a) kneading the ingredients so that the binder is subjected to fibrillation, and molding a lump out of the ingredients after the fibrillation, (b) crushing the lump into granules for the electrode sheet of the electric double-layer capacitor and (c) forming the granules into the electrode sheet
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