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Separator for non-aqueous secondary battery and non-aqueous secondary battery

A secondary battery, non-aqueous technology, used in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of increased internal resistance and decreased adhesion of batteries

Active Publication Date: 2018-08-24
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has the following problems: the structural site that contributes to ion conductivity lowers the adhesive force; and the application of the adhesive to the separator destroys the pores of the separator, resulting in an increase in the internal resistance of the battery. High (Second subject)

Method used

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  • Separator for non-aqueous secondary battery and non-aqueous secondary battery
  • Separator for non-aqueous secondary battery and non-aqueous secondary battery
  • Separator for non-aqueous secondary battery and non-aqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0234] Polyvinylidene fluoride resin (VDF-HFP copolymer, HFP unit content is 12.4% by mass, weight average molecular weight is 860,000) and acrylic resin (methyl methacrylate-styrene copolymer, polymerization ratio [mass Ratio] is 50:50, weight average molecular weight is 115,000, and glass transition temperature is 105 ℃) be dissolved in the mixed solvent of dimethylacetamide and tripropylene glycol (dimethylacetamide: tripropylene glycol=80:20 [mass ratio]), a coating solution for forming an adhesive porous layer was produced. The mass ratio of the polyvinylidene fluoride-based resin and the acrylic resin contained in the coating liquid was 80:20, and the resin concentration of the coating liquid was 5.0% by mass.

[0235] The coating solution was applied to both sides of a polyethylene microporous membrane (film thickness 9.0 μm, Gurley value 150 sec / 100 cc, porosity 43%) as a porous substrate (in this case, the surface and the back surface Coated so that the coating amoun...

Embodiment 2

[0237] The acrylic resin was changed to a terpolymer of methyl methacrylate-styrene-unsaturated carboxylic acid anhydride (polymerization ratio [mass ratio] 10:70:20, weight average molecular weight 113,000, glass transition temperature was 130° C.), except that, it was carried out in the same manner as in Example 1 to produce a separator.

Embodiment 3

[0239] The acrylic resin was changed to a terpolymer of methyl methacrylate-styrene-unsaturated carboxylic acid anhydride (polymerization ratio [mass ratio] of 30:50:20, weight average molecular weight of 130,000, glass transition temperature was 115° C.), except that, it was carried out in the same manner as in Example 1 to produce a separator.

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Abstract

The present invention relates to a separator for a non-aqueous secondary battery, and a non-aqueous secondary battery. The present invention provides a separator with good adhesion with an electrode based on drying hot pressing and with excellent adhesion with the electrode if even the separator for the non-aqueous secondary battery is dipped into electrolyte, or a separator for a non-aqueous secondary battery with good adhesion with the electrode based on drying hot pressing and with low ion conduction resistance. The separator for the non-aqueous secondary battery has a porous substrate, andan adhesive porous layer that is provided on one side or both sides of the porous substrate and contains an acrylic type resin and a polyvinylidene fluoride type resin, the acrylic type resin is a copolymer containing an acrylic type monomer and a styrene type monomer as monomer components, and a second monoacrylate type monomer that has an oxyalkylene structural unit with a repetition number offrom 2 to 10,000.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous secondary battery and a nonaqueous secondary battery. Background technique [0002] Non-aqueous secondary batteries represented by lithium-ion secondary batteries have been widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, and video cameras. With the miniaturization and weight reduction of portable electronic equipment, the simplification and weight reduction of the external packaging of non-aqueous secondary batteries have been carried out. As an external packaging material, aluminum casings have been developed instead of stainless steel casings. , and furthermore, instead of the metal case, a package made of aluminum laminated film was developed. However, the package made of aluminum laminated film is soft, so for a battery (so-called flexible package battery) using the package as an external packaging material, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525C08J7/04H01M50/411H01M50/417H01M50/42H01M50/426H01M50/446H01M50/449H01M50/491
CPCH01M10/0525C08J2427/16C08J2433/12C08J2323/06C08J7/0427H01M50/446H01M50/491H01M50/42H01M50/426H01M50/417Y02E60/10H01M50/44H01M50/461Y02P70/50H01M10/052H01M50/449H01M50/46H01M4/405H01M10/058
Inventor 樱井博志西川聪
Owner TEIJIN LTD
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