Porous membrane for secondary battery, separator for secondary battery, and secondary battery

A technology for secondary batteries and porous membranes, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of expansion of short-circuit parts, easy shrinkage, generation of reaction heat, etc., and achieves high adhesion strength and is not easy to curl. Effect

Active Publication Date: 2014-03-05
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separators made of stretched resin tend to shrink even at temperatures below about 150°C, and short circuits in the battery are likely to occur
In addition, when a sharp-shaped protrusion such as a nail penetrates the battery (for example, during a nail penetration test), there is a tendency for an instantaneous short circuit to occur, generate reaction heat, and expand the short circuit portion.

Method used

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  • Porous membrane for secondary battery, separator for secondary battery, and secondary battery
  • Porous membrane for secondary battery, separator for secondary battery, and secondary battery
  • Porous membrane for secondary battery, separator for secondary battery, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0272] (manufacturing of water-soluble polymers)

[0273] Add 67.5 parts of ethyl acrylate as (meth)acrylate monomer, 30 parts of methacrylic acid as ethylenically unsaturated carboxylic acid monomer, 2.5 parts of trifluoromethyl methacrylate as an ester monomer, 1.0 parts of sodium dodecylbenzenesulfonate as an emulsifier, 150 parts of ion-exchanged water, and 0.5 parts of potassium persulfate as a polymerization initiator, and fully stirred , heated to 60 ° C to initiate polymerization. When the polymerization conversion rate reached 96%, the reaction was cooled to stop the reaction, and an aqueous solution containing a water-soluble polymer was obtained. 10% ammonia water was added to the aqueous solution containing the water-soluble polymer thus obtained to adjust the pH to 8 to obtain an aqueous solution containing the desired water-soluble polymer. When the weight average molecular weight of the obtained water-soluble polymer was measured, it was 128,000.

[0274] Usi...

Embodiment 2

[0290] When producing the water-soluble polymer, the amount of ethyl acrylate as the (meth)acrylate monomer was changed to 77.5 parts, and the amount of methacrylic acid as the ethylenically unsaturated carboxylic acid monomer was changed to 20 parts, Other than that, it carried out similarly to Example 1, the water-soluble polymer, separator, and battery were manufactured, and each evaluated. The results are shown in Table 1.

Embodiment 3

[0292] When producing the water-soluble polymer, the amount of ethyl acrylate as a (meth)acrylate monomer was changed to 72.5 parts, and the amount of methacrylic acid as an ethylenically unsaturated carboxylic acid monomer was changed to 25 parts, Other than that, it carried out similarly to Example 1, the water-soluble polymer, separator, and battery were manufactured, and each evaluated. The results are shown in Table 1.

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Abstract

In the present invention, a porous membrane for use in a secondary battery, which contains non-conductive particles and a water-soluble polymer, uses as a water-soluble polymer a copolymer that contains 15 to 50% by weight of an ethylene-unsaturated carboxylic acid monomer unit, 30 to 80% by weight of a (meth) acrylic acid ester monomer unit, and 0.5 to 10% by weight of a fluorine-containing (meth) acrylic acid ester monomer unit.

Description

technical field [0001] The present invention relates to a porous membrane for secondary batteries, a separator for secondary batteries having the same, and a secondary battery. Background technique [0002] Among the batteries that have been put into practical use, lithium secondary batteries exhibit high energy density, and are especially used in many small electronic devices. In addition, lithium secondary batteries are expected to be used in automobiles in addition to small applications. Such a lithium secondary battery generally has a positive electrode and a negative electrode including an electrode mixture layer (also referred to as an electrode active material layer) supported on a current collector, a separator, and a nonaqueous electrolytic solution. In addition, the electrode mixture layer usually contains an electrode active material having an average particle diameter of about 5 μm to 50 μm, and a binder for the electrode mixture layer. [0003] The electrode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08F220/12H01M10/0566H01M50/417
CPCY02E60/12H01M2/1653C08F220/12H01M2/166H01M10/0569H01M50/446H01M50/417Y02E60/10H01M50/42H01M50/491H01M50/489H01M10/052
Inventor 丰田裕次郎
Owner ZEON CORP
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