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

A secondary battery, non-aqueous technology, applied in the field of non-aqueous secondary battery separators and non-aqueous secondary batteries, can solve the problems of decreased cycle life, blocked surface pores of the separator, increased internal resistance of the battery, etc. Good adhesion, excellent adhesion, and excellent cycle characteristics

Inactive Publication Date: 2018-09-14
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are cases where the surface pores of the separator are clogged due to the coating of the aqueous emulsion on the separator
In this case, even if the separator and the electrodes are bonded by dry heat and pressure, the internal resistance of the battery will increase. As a result, the cycle life may decrease when the battery is used for a long period of time.

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

[0211] At room temperature, polyvinylidene fluoride resin (VDF-HFP copolymer, HFP unit content is 12.4% by mass, weight average molecular weight is 860,000), maleic anhydride modified acrylic resin (methyl methacrylate-benzene Tertiary copolymer of ethylene-maleic anhydride, the polymerization ratio [mass ratio] is 10:70:20, the weight-average molecular weight is 113,000, and the glass transition temperature is 130°C), and polyvinyl alcohol-based resin (JAPAN VAM&POVAL CO .,LTD. 10MZ, the degree of polymerization is 250, the degree of saponification is 70 mol%) dissolved in a mixed solvent of dimethylacetamide and tripropylene glycol (dimethylacetamide:tripropylene glycol=80:20 [mass ratio] ), and reacted at 80° C. for 2 hours to prepare a coating liquid for forming an adhesive porous layer. The mass ratio of polyvinylidene fluoride-based resin, polyvinyl alcohol-based resin, and maleic anhydride-modified acrylic resin contained in the coating liquid was 80:18:2, and the resin...

Embodiment 2

[0214] As the maleic anhydride-modified acrylic resin, it was changed to a ternary copolymer of methyl methacrylate-styrene-maleic anhydride (the polymerization ratio [mass ratio] is 30:50:20, the weight average molecular weight is 130,000, and the glass Transition temperature is 115° C.), except that, it was carried out in the same manner as in Example 1 to produce a separator.

Embodiment 3

[0216] As the polyvinyl alcohol-based resin, it was changed to a binary copolymer of vinyl acetate and ethoxydiethylene glycol acrylate (the polymerization ratio [mass ratio] is 90:10, the degree of polymerization is 1000, and the degree of saponification is 98 mol % ), except that, the same operation as in Example 1 was performed to produce a separator.

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Abstract

The invention relates to a separator for a non-aqueous secondary battery and the non-aqueous secondary battery. The object of the invention is to provide a separator for a non-aqueous secondary battery, the separator is a separator with an adhesive porous layer including a polyvinylidene fluoride type resin, and in terms of the separator, the adhesion with an electrode based on dry type thermal pressurization is good, and the adhesion with the electrode is excellent even after immersion of electrolyte. The separator for the non-aqueous secondary battery includes a porous substrate, and an adhesive porous layer that is arranged at one side or both sides of the porous substrate and that contains a polyvinylidene fluoride type resin, the adhesive porous layer further contains (1) a carboxylicanhydride and / or a resin that contains a carboxylic anhydride as a monomer component, and (2) a resin that contains a hydroxyl group or an amino group.

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): H01M2/14H01M2/16H01M10/0525C09J7/26C09J7/30C09J129/04C09J131/04C09J127/16C09J151/00H01M50/406H01M50/411H01M50/431H01M50/449H01M50/489H01M50/491
CPCC09J7/30C09J7/26H01M10/0525C09J2451/00C09J2431/00C09J2429/00C09J2427/00C09J2301/122C09J2301/124H01M50/411H01M50/406H01M50/491H01M50/449H01M50/489C09J127/16C09D133/12Y02E60/10H01M50/446H01M50/461C08L25/04C08L29/04H01M10/052H01M50/426H01M50/414H01M2300/0017H01M2220/30H01M50/44H01M50/581
Inventor 樱井博志西川聪
Owner TEIJIN LTD