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Alkaline battery separator and process for producing the same

A technology for alkaline batteries and manufacturing methods, applied to battery components, circuits, electrical components, etc., capable of solving problems such as separator degradation, poor self-discharge inhibition, and short circuits

Inactive Publication Date: 2005-02-23
JAPAN VILENE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if this kind of separator is used on batteries such as nickel-cadmium batteries and nickel-hydrogen batteries, the oxygen generated during overcharging will deteriorate the separator and cause a short circuit, or the deterioration caused by oxygen will adversely affect the electrode plate. Shorter battery life and poor self-discharge suppression

Method used

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  • Alkaline battery separator and process for producing the same
  • Alkaline battery separator and process for producing the same
  • Alkaline battery separator and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] The core material component is composed of polypropylene and the shell material component is composed of high-density polyethylene (melting point 132 ° C) core-shell type thermal bonding fiber (denier = 1.2 dtex, fiber length = 10 mm, high-density polyethylene accounts for fiber surface 100%) 100% by mass is dispersed into a pulp, and the pulp is formed into a fiber web by a conventional wet sheet-making method. Then heat-treat this fibrous web at 136°C, make it pass between rollers with a linear pressure of 10 N / cm, and bond the high-density polyethylene as the core-shell type heat-adhesive fiber shell material component to form a non-woven fabric before treatment ( Areal density = 55.4 g / m 2 ).

[0159] In addition, a graft polymerization solution was prepared with the following composition.

[0160] (1) Acrylic acid monomer 25% by mass

[0161] (2) Benzophenone 0.3% by mass

[0162] (3) Iron sulfate 0.4% by mass

[0163] (4) Nonionic surfactant 3% by mass

[0164...

Embodiment 2

[0174] Composed of polypropylene (fan-shaped cross-section, melting point = 160°C) and high-density polyethylene (fan-shaped cross-section, melting point = 130°C), orange-shaped cross-section, fineness 2.2 dtex, and fiber length 10 mm , splittable fibers capable of being split by water flow (dividable into 8 ultrafine fibers of polypropylene with a fineness of 0.138 dtex and 8 ultrafine fibers of polyethylene with a fineness of 0.138 dtex) account for 70% by mass, and the core material is composed of polypropylene And the shell material is composed of low-density polyethylene (melting point 110 ℃), the core-shell type heat-bonding fiber with a denier of 2.2 decitex and a fiber length of 10 mm accounts for 30% by mass of mixed fibers, after dispersion pulping, according to conventional wet papermaking method to form a fiber web.

[0175] Then, only the low density polyethylene component in the core-shell type thermal bonding fiber was bonded by heat treating this fiber web at 1...

Embodiment 3

[0179] Form surface density 35 grams / meter in the same way as embodiment 2 2 wet fiber web. In addition, except that the divisible fiber of Example 2 and the fiber length were 38 mm, the same divisible fiber as in Example 2 accounted for 70% by mass, and the core-shell fiber and fiber length of Example 2 were 38 mm. In addition to the millimeter, the same core-shell fiber as in Example 2 accounts for 30% by mass and is mixed together, and is opened with a carding machine to form a surface density of 20 g / m 2 isotropic fiber web. Then, the wet-laid fiber web and the isotropic fiber web are laminated together to form a laminated fiber web.

[0180] Next, this laminated fiber web was treated in exactly the same way as in Example 2, that is, according to thermally bonding the low-density polyethylene component in the core-shell type heat-bonding fiber, splitting the splittable fiber with water flow, and making the low-density polyethylene component in the core-shell type heat-bo...

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Abstract

An alkaline battery separator comprising a fiber sheet containing, on outer surfaces of fibers forming a surface of the fiber sheet, a substance having a peak of a bond energy at 530.5 to 531.5 eV which is measured by an X-ray photoelectron spectrometer at a photoelectron-taking-off angle of about 30 DEG ; a fiber sheet containing a larger amount of carboxyl groups bonded to surfaces of fibers forming an inside of the fiber sheet than an amount of carboxyl groups bonded to outer surfaces of fibers forming a surface of the fiber sheet; or a fiber sheet capable of entrapping ammonia in an amount of 0.4 mmol / g or more in average is disclosed.

Description

technical field [0001] The present invention relates to a separator for alkaline batteries (hereinafter sometimes simply referred to as a "separator") and a method for producing the same. The separator for alkaline batteries of the present invention can be used, for example, in alkaline primary batteries (such as alkaline manganese batteries, mercury batteries, silver oxide batteries, or air batteries) or secondary batteries (such as nickel-cadmium batteries, silver-zinc batteries, silver cadmium batteries, nickel zinc batteries, nickel metal hydride batteries or rechargeable alkaline manganese batteries), especially can be excellently used in nickel cadmium batteries and nickel metal hydride batteries and the like. Background technique [0002] The purpose of using separators in the past is to isolate the positive and negative electrodes of alkaline batteries to prevent short circuits, and at the same time maintain the electrolyte so that the discharge reaction can proceed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/44
CPCH01M2/162Y02E60/10H01M50/44H01M50/414
Inventor 田中政尚佐藤和哉加藤宏一伊藤康博山崎洋昭广冈正纪川津善章
Owner JAPAN VILENE CO LTD