ELECTRIC STORAGE DEVICE

• US 20120045685A1
• Filed: 04/05/2011
• Published: 02/23/2012
• Est. Priority Date: 04/06/2010
• Status: Abandoned Application

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Tokin Corporation (Yageo Corporation)
• Inventors: Yoshida, Katsuhiro, Seki, Daisuke, Hato, Yukinori, Ooya, Masako, Miyagawa, Risa, Maeda, Kouji
• Application Number:
  US13/266,964
• Publication Number:
  US 20120045685A1
• Time in Patent Office: Days
• US Class Current: 429/153
• CPC Class Codes: H01G 11/06 with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
• CPC Class Codes: H01G 11/12 Stacked hybrid or EDL capacitors
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: H01G 11/72 specially adapted for integration in multiple or stacked hybrid or EDL capacitors
• CPC Class Codes: H01G 11/86 specially adapted for electrodes carbonisation or activation of carbon for the manufacture of electrodes H01G11/34
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 4/80 Porous plates, e.g. sintered carriers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making

Abstract

To provide an electric storage device whose negative electrode can be doped with lithium ions in a short time and whose resistance can be lowered. An electric storage device including a unit that is obtained by alternately stacking a positive-electrode sheet 9 and a negative-electrode sheet 10 with a separator 3 interposed therebetween, the positive electrode sheet 9 including a positive-electrode active material layer 1 and a positive-electrode charge collector 4, and the negative electrode sheet 10 including a negative-electrode active material layer 2 and a negative-electrode charge collector 5, in which a foil, an etching foil, or a porous lath foil is used as the positive-electrode charge collector 4 and the negative-electrode charge collector 5, a cut is made in a coating area of the positive-electrode active material layer 1 and the negative-electrode active material layer 2, and a lithium supply source is disposed so as to be opposed to the negative electrode sheet 10 of the unit.

Claims

1. An electric storage device comprising a unit that is obtained by alternately stacking a positive-electrode sheet and a negative-electrode sheet with a separator interposed therebetween, the positive electrode sheet comprising a positive-electrode active material layer and a positive-electrode charge collector, and the negative electrode sheet comprising a negative-electrode active material layer and a negative-electrode charge collector, wherein

a foil, an etching foil, or a porous lath foil is used as the positive-electrode charge collector and the negative-electrode charge collector,

a cut is made in a coating area of the positive-electrode active material layer and the negative-electrode active material layer, and

a lithium supply source is disposed so as to be opposed to the negative electrode sheet of the unit.

2. The electric storage device according to claim 1, wherein

each of the positive-electrode active material layer and the negative-electrode active material layer has a quadrangular shape, and

in each of the positive-electrode sheet and the negative-electrode sheet, a ratio of a sum of a length of the cut to a sum of lengths of four sides of the positive-electrode active material layer and the negative-electrode active material layer is not less than 10% and not greater than 100,000%.

3. The electric storage device according to claim 1, wherein a number of the cut in the coating area of each of the positive-electrode active material layer and the negative-electrode active material layer is not less than 2 and not greater than 4,000.

4. The electric storage device according to claim 1, wherein an interval between the cuts is not smaller than 0.1 mm and not greater than 10 cm.

5. The electric storage device according to claim 1, wherein an end of the cut does not reach a side of the positive-electrode sheet or the negative-electrode sheet.

6. The electric storage device according to claim 1, wherein a plurality of units each of which is obtained by stacking the positive-electrode sheet, the negative-electrode sheet, and the separator are connected to one lithium supply source.

7. The electric storage device according to claim 1, wherein the electric storage device is a hybrid capacitor or a lithium-ion secondary battery.

8. A method of manufacturing an electric storage device comprising a unit that is obtained by alternately stacking a positive-electrode sheet and a negative-electrode sheet with a separator interposed therebetween, the positive electrode sheet comprising a positive-electrode active material layer and a positive-electrode charge collector, and the negative electrode sheet comprising a negative-electrode active material layer and a negative-electrode charge collector, the method comprising:

using a foil, an etching foil, or a porous lath foil as the positive-electrode charge collector and the negative-electrode charge collector;

forming a cut in a coating area of the positive-electrode active material layer and the negative-electrode active material layer; and

disposing a lithium supply source in such a manner that the lithium supply source is opposed to the negative electrode sheet of the unit.

9. The method of manufacturing an electric storage device according to claim 8, wherein

each of the positive-electrode active material layer and the negative-electrode active material layer has a quadrangular shape, and

in each of the positive-electrode sheet and the negative-electrode sheet, a ratio of a sum of a length of the cut to a sum of lengths of four sides of the positive-electrode active material layer and the negative-electrode active material layer is not less than 10% and not greater than 100,000%.

10. The method of manufacturing an electric storage device according to claim 8, wherein a number of the cut in the coating area of each of the positive-electrode active material layer and the negative-electrode active material layer is not less than 2 and not greater than 4,000.

11. The method of manufacturing an electric storage device according to claim 8, wherein an interval between the cuts is not smaller than 0.1 mm and not greater than 10 cm.

12. The method of manufacturing an electric storage device according to claim 8, wherein an end of the cut does not reach a side of the positive-electrode sheet or the negative-electrode sheet.

13. The method of manufacturing an electric storage device according to claim 8, wherein a plurality of units each of which is obtained by stacking the positive-electrode sheet, the negative-electrode sheet, and the separator are connected to one lithium supply source.

14. The method of manufacturing an electric storage device according to claim 8, wherein the electric storage device is a hybrid capacitor or a lithium-ion secondary battery.