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Cell diaphragm and secondary cell

A battery separator and secondary battery technology, applied in nickel batteries, alkaline batteries, battery pack components, etc., can solve the problems of carbonization of the separator and the reduction of mechanical strength of the separator, and achieve the effect of high hydrophilicity and high mechanical strength

Inactive Publication Date: 2011-01-19
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In addition, sulfonation treatment has the side effect of carbonizing the diaphragm while introducing sulfonic acid groups. When the degree of treatment is increased, although the hydrophilicity can be improved, the mechanical strength of the diaphragm will be reduced.

Method used

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  • Cell diaphragm and secondary cell
  • Cell diaphragm and secondary cell
  • Cell diaphragm and secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Weight per unit area 53g / m 2 , Polypropylene (hereinafter referred to as PP) spunbond non-woven fabric with a thickness of 125 μm, and a polyethylene (hereinafter referred to as PE) emulsion is coated by dipping method (for example, "Chemical Pal M200" manufactured by Mitsui Chemicals can be used) so that the coating rate becomes 0.1% by weight, and it is dried at 125° C. and fixed to form a PE coating layer. Then, with a treatment density of 220kW / m 2 / min corona discharge treatment to make it hydrophilized to make battery separators.

Embodiment 2

[0065] A battery separator was obtained in the same manner as in Example 1 except that the coating rate of the PE emulsion was changed to 1% by weight.

Embodiment 3

[0067] A battery separator was obtained in the same manner as in Example 1 except that the coating rate of the PE emulsion was changed to 3% by weight.

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PUM

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Abstract

The invention relates to a cell diaphragm and a secondary cell. The cell diaphragm is mainly made from polypropylene series resins. Polyethylene series resin surface is formed on a non-woven fabric formed by mutual bonding of polypropylene series resins, and hydrophilizing like free radical reaction treatment or sulfonation treatment is conducted on the surface of polyethylene series resins, thereby a secondary cell diaphragm and a secondary cell therewith of high mechanical intensity and high hydrophilicity are provided.

Description

technical field [0001] The present invention relates to a battery separator suitable for a secondary battery and a secondary battery, for example, relates to a battery separator suitable for an alkaline secondary battery and an alkaline secondary battery. Background technique [0002] Alkaline secondary batteries such as nickel-metal hydride secondary batteries are excellent in charge-discharge characteristics and overcharge-discharge characteristics, and have a long life, so they can be used repeatedly. In addition, since it has low internal resistance and excellent high-current characteristics, it is expected to be used as a battery for electric vehicles, electric tools, and the like. [0003] Separators used in these batteries are required to have the following properties: [0004] (1) Show hydrophilicity, ability to hold electrolyte, [0005] (2) The separator is required to have sufficient mechanical strength in order to prevent positive electrode-negative electrode s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/30D06N3/04H01M50/414
CPCY02E60/124Y02E60/10
Inventor 佐久间贵士上田昌彦西坂考平佐鹿雅敏山崎泰久
Owner NIPPON KODOSHI