Separator for alkaline batteriy and using same

• US 20060121340A1
• Filed: 09/05/2003
• Published: 06/08/2006
• Est. Priority Date: 09/11/2002
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Kuraray Company Limited, Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kawai, Hiroyuki, Mukai, Yasuo, Murate, Yasunori, Noya, Shigeto, Tatayama, Takashi, Toyoura, Hitoshi, Sonetaka, Tomoyasu
• Application Number:
  US10/527,315
• Publication Number:
  US 20060121340A1
• Time in Patent Office: Days
• US Class Current: 429/142
• CPC Class Codes: D01F 2/00 Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
• CPC Class Codes: D01F 6/805 from aromatic copolyamides
• CPC Class Codes: D21H 13/08 from regenerated cellulose
• CPC Class Codes: D21H 13/26 Polyamides; Polyimides
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01M 10/24 Alkaline accumulators
• CPC Class Codes: H01M 50/423 Polyamide resins
• CPC Class Codes: H01M 50/429 Natural polymers
• CPC Class Codes: H01M 50/4295 Natural cotton, cellulose or wood
• CPC Class Codes: H01M 50/44 Fibrous material
• CPC Class Codes: H01M 6/04 Cells with aqueous electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A separator for alkaline batteries exhibits excellent property for holding the alkaline electrolyte, is not degraded even when the separator is used for alkaline batteries using a positive electrode mix containing an agent having a great oxidizing ability for enhancing the discharging property under a great load, maintains the function as the separator even when the separator is exposed to high temperatures for a long time and can be effectively used for alkaline batteries which are used for portable information instruments requiring the excellent discharging property under a great load such as digital cameras. The separator for alkaline batteries has a non-woven fiber structural material which comprises a polyamide fiber formed with a polyamide constituted with 60% to 100% by mole of a dicarboxylic acid unit and 40 to 99% by mole of 1,9-nonanediamine unit and a solvent-spun cellulose fiber as the main component fibers, and the ratio of the amounts by mass of the polyamide fiber to the cellulose fiber is 20:80 to 80:20. Preferably, the polyamide forming the polyamide fiber comprises the 2-methyl-1,8-octanediamine unit in combination with the 1,9-nonanediamine unit, and the ratio of the amounts by mole of the 1,9-nonanediamine unit to the 2-methyl-1,8-octanediamine unit is 99:1 to 40:60.

Claims

1. A separator for alkaline batteries (i) which comprises a non-woven fiber structural material comprising a polyamide fiber and a cellulose fiber as main component fibers, wherein

(ii) the polyamide fiber is a fiber formed with a polyamide constituted with a dicarboxylic acid unit and a diamine unit, the dicarboxylic acid unit comprising 60% by mole or more and 100% by mole or less of a terephthalic acid unit and the diamine unit comprising 40% by mole or more and 99% by mole or less of a 1,9-nonanediamine unit;

(iii) the cellulose fiber is a solvent-spun cellulose fiber produced by using a spinning solution prepared by dissolving cellulose into a non-reactive solvent; and

(iv) a ratio of an amount by mass of the polyamide fiber to an amount by mass of the cellulose fiber in the non-woven fiber structural material is in a range of 20;

80 to 80;

20.

2. A separator for alkaline batteries according to claim 1, wherein the polyamide forming the polyamide fiber comprises a 2-methyl-1,8-octanediamine unit in combination with the 1,9-nonanediamine unit, and a ratio of an amount by mole of the 1,9-nonanediamine unit to an amount by mole of the 2-methyl-1,8-octanediamine unit in the polyamide is in a range of 99:

1 to 40;

60.

3. A separator for alkaline batteries according to any one of claims 1 and 2, wherein the polyamide forming the polyamide fiber has a fraction of sealed chain ends of 10% or greater.

4. A separator for alkaline batteries according to any one of claims 1 to 3, wherein a size of a single fiber in the polyamide fiber is in a range of 0.01 to 1.0 dtex.

5. A separator for alkaline batteries according to any one of claims 1 to 4, wherein the cellulose fiber is a solvent-spun cellulose fiber obtained by dry-wet spinning in water of a spinning solution prepared by dissolving cellulose into an amine oxide.

6. A separator for alkaline batteries according to any one of claims 1 to 5, wherein the main component fibers are adhered together with a fiber-shaped binder.

7. A separator for alkaline batteries according to claim 6, wherein an amount of the fiber-shaped binder is in a range of 3 to 30% by mass based on a total of an amount by mass of the main component fibers and an amount by mass the fiber-shaped binder.

8. An alkaline battery which is equipped with a separator for alkaline batteries described in any one of claims 1 to 7.