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Separator for battery

A technology for separators and batteries, which is applied to battery components, circuits, electrical components, etc., can solve the problems of reduced self-discharge reaction inhibition effect, achieve long-term maintenance of battery capacity, improve manufacturing stability, and inhibit self-discharge.

Inactive Publication Date: 2015-04-22
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sulfonated oil agent decomposes due to the temperature rise inside the battery during charging and discharging, and is released from the fibers, so there is a problem that the inhibitory effect of the self-discharge reaction is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0089] Dissociate and disperse 100 parts by mass of core-sheath composite fibers (core / sheath mass ratio 50 / 50, fineness 0.8dtex, fiber length 5mm) in the water of a pulper, and slowly stir with a stirrer to prepare a uniform slurry for papermaking , in the DSC curve of the differential scanning calorimetry analysis of the core-sheath composite fiber, the ratio (C / D) of the melting peak area (C) on the low melting point side to the melting peak area (D) on the high melting point side is 1.06, The core composition is polypropylene and the sheath composition is high density polyethylene. This papermaking slurry was made using a wet papermaking method using a cylinder paper machine, and dried using a Yankee dryer set at 135°C as a hot plate crimping method and a hot air hood installed alongside it. Simultaneously, the sheath portion of the core-sheath composite fiber was thermally melt-bonded to produce a nonwoven fabric having a width of 500 mm. In dry air at 75°C containing su...

Embodiment 2）

[0091] Except in Example 1, the ratio (C / D) of the melting peak area (C) on the low melting point side to the melting peak area (D) on the high melting point side in the DSC curve analyzed using differential scanning calorimetry was 1.27. The core-sheath type composite fiber (core / sheath mass ratio 50 / 50, fineness 0.8dtex, fiber length 5mm) except that the component is polypropylene and the sheath component is high-density polyethylene, is the same as in Example 1 to obtain a weight per unit area of 53.6g / m 2 battery separator. The ratio (A / B) of the melting peak area (A) on the low melting point side to the melting peak area (B) on the high melting point side in differential scanning calorimetry of the obtained battery separator was 1.24.

Embodiment 3）

[0093] Except in Example 1, the ratio (C / D) of the melting peak area (C) on the low melting point side to the melting peak area (D) on the high melting point side in the DSC curve analyzed using differential scanning calorimetry was 1.38. The core-sheath type composite fiber (core / sheath mass ratio 50 / 50, fineness 0.8dtex, fiber length 5mm) except that the component is polypropylene and the sheath component is high-density polyethylene, is the same as in Example 1 to obtain a weight per unit area of 53.7g / m 2 battery separator. The ratio (A / B) of the melting peak area (A) on the low melting point side to the melting peak area (B) on the high melting point side in differential scanning calorimetry of the obtained battery separator was 1.42.

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Abstract

A separator for a battery which is produced by sulfonating a polyolefin nonwoven fabric that comprises core-sheath-type composite fibers each comprising polypropylene as a core component and high-density polyethylene as a sheath component, and which is characterized in that, in a DSC curve obtained by the differential scanning calorimetry of the core-sheath-type fibers and the separator, the ratio of the melting peak area (A) derived from the high-density polyethylene and appearing on the lower melting point side to the melting peak area (B) derived from the polypropylene and appearing on the higher melting point side (i.e., A / B) is 1.00 to 2.50 inclusive; and a separator for a battery, which is produced by sulfonating a nonwoven fabric that comprises at least polyolefin fibers, and which is characterized in that the content of an oily material in the nonwoven fabric that is not sulfonated yet is 0.40 mass% or less.

Description

technical field [0001] The present invention relates to a battery separator that can be suitably used in alkaline secondary batteries such as nickel-cadmium batteries, nickel-zinc batteries, and nickel-hydrogen batteries. Background technique [0002] Alkaline secondary batteries such as nickel-cadmium batteries and nickel-hydrogen batteries have excellent charge-discharge characteristics and overcharge-discharge characteristics, and can be used repeatedly for a long life. Therefore, they are used in small electronic devices such as wireless phones, notebook computers, and audio equipment. , It is also widely used in small-scale power applications such as electric tools and electric bicycles, and large-scale power applications such as hybrid vehicles and electric vehicles. As the function of the battery separator used in this alkaline secondary battery, the separation of the positive electrode and the negative electrode, the prevention of short circuit, the absorption and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 广田展章江角真一松冈昌伸
Owner MITSUBISHI PAPER MILLS LTD
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