Capacitor element and battery cell

• US 6,343,003 B1
• Filed: 11/09/1998
• Issued: 01/29/2002
• Est. Priority Date: 11/14/1997
• Status: Expired due to Fees

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Corporation
• Inventors: Kurihara, Junko, Sakata, Koji, Harada, Gaku, Okada, Shinako
• Primary Examiner(s): Reichard, Dean A.
• Assistant Examiner(s): Ha, Nguyen T
• Application Number:
  US09/187,757
• Time in Patent Office: 1,177 Days
• Field of Search: 361/503, 361/502, 361/433, 361/434, 361/517, 361/509, 361/505, 361/510, 361/511, 521/90
• US Class Current: 361/503
• CPC Class Codes: H01G 11/20 Reformation or processes for removal of impurities, e.g. scavenging
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01G 11/72 specially adapted for integration in multiple or stacked hybrid or EDL capacitors
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2300/0085 Immobilising or gelification of electrolyte
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 6/22 Immobilising of electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A capacitor element and a battery cell which a dry-up phenomenon is restricted and an internal resistance is small are provided. The capacitor element provides a porous separator which has ion permeability and the ability of insulation, a pair of carbon electrode layers having many successive through holes separated by the porous separator, a non-conductive gasket holding the surrounding ends of the carbon electrode layers, a pair of conductive separators holding the carbon electrode layers and the non-conductive gasket from the outside, electrolyte solution in the successive through holes of the carbon electrode layers, and minute particles which are more than 0.1 weight % and less than 5.0 weight % of the electrolyte solution. A battery cell provides electrolyte solution and positive/negative electrode active material layers containing minute particles which are more than 0.1 weight % and less than 5.0 weight % of the electrolyte solution in the successive through holes.

Claims

1. A capacitor element, comprising:

a porous separator which has ion permeability and the ability of insulation;

a pair of carbon electrode layers having many successive through holes separated by said porous separator;

a non-conductive gasket holding the surrounding ends of said carbon electrode layers;

a pair of conductive separators holding said carbon electrode layers and said non-conductive gasket from the outside;

electrolyte solution in said successive through holes of said carbon electrode layers; and

minute particles which are more than 0.1 weight % and less than 5.0 weight % of said electrolyte solution in said successive through holes of said carbon electrode layers.

2. A capacitor element in accordance with claim 1, wherein:

said minute particles have a diameter less than 100 nm.

3. A capacitor element in accordance with claim 2, wherein:

said minute particles are silica gel.

4. A capacitor element in accordance with claim 2, wherein:

said minute particles are super-minute particle type anhydrous silica.

5. The capacitor element of claim 2, wherein said minute particles are smaller than 10 nm in diameter.

6. The capacitor element of claim 1, wherein said minute particles are more than 0.5 wt % and less than 1.0 wt % of said electrolyte solution.