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Microporous polyolefin film, separator for battery, and secondary battery

A technology of microporous membrane and polyolefin, which is applied to battery components, circuits, electrical components, etc., can solve the problems of shortened battery life and reduced strength, and achieve the effect of excellent battery characteristics

Active Publication Date: 2021-11-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen that both (2a) and (2c) have a high possibility of strength reduction. In addition, (2b) and (2d) cause lithium ions to form dendrites with needle-like structures on the electrode surface as the battery is charged and discharged. Crystals are easy to generate, and the life of the battery is shortened.

Method used

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  • Microporous polyolefin film, separator for battery, and secondary battery
  • Microporous polyolefin film, separator for battery, and secondary battery
  • Microporous polyolefin film, separator for battery, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0318] At a weight average molecular weight of 2.88×10 6 , a molecular weight distribution of 18.4, and a melting point of 100 parts by mass of ultra-high molecular weight polyethylene of 133°C, dry-blended tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxybenzene) as an antioxidant Base)-propionate] 0.375 parts by mass of methane to prepare a polyethylene composition.

[0319] 12 parts by mass of the obtained polyethylene composition was charged into a twin-screw extruder. Furthermore, 88 parts by mass of liquid paraffin was supplied from the side feeder of the twin-screw extruder, melt-kneaded, and a polyethylene resin solution was prepared in the extruder.

[0320] Next, a polyethylene resin solution was extruded at 210° C. from a die installed at the front end of the extruder, and an unstretched gel-like sheet was formed while being pulled by a cooling roll whose internal cooling water temperature was kept at 25° C. . The cooled extrudate was first stretched in the MD di...

Embodiment 2

[0323] At a weight average molecular weight of 2.88×10 6 , a molecular weight distribution of 18.4, and a melting point of 100 parts by mass of ultra-high molecular weight polyethylene of 133°C, dry-blended tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxybenzene) as an antioxidant base)-propionate] methane 0.375 parts by mass to produce a polyethylene composition.

[0324] 10 parts by mass of the obtained polyethylene composition was charged into a twin-screw extruder. Furthermore, 90 parts by mass of liquid paraffin was supplied from the side feeder of the twin-screw extruder, melt-kneaded, and a polyethylene resin solution was prepared in the extruder.

[0325] Next, a polyethylene resin solution was extruded at 210° C. from a die installed at the front end of the extruder, and an unstretched gel-like sheet was formed while being pulled by a cooling roll whose internal cooling water temperature was kept at 25° C. . The cooled extrudate was first stretched in the MD direc...

Embodiment 3

[0328] At a weight average molecular weight of 2.88×10 6 , a molecular weight distribution of 18.4, and a melting point of 100 parts by mass of ultra-high molecular weight polyethylene of 133°C, dry-blended tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxybenzene) as an antioxidant base)-propionate] methane 0.375 parts by mass to produce a polyethylene composition.

[0329] 11 parts by mass of the obtained polyethylene composition were charged into a twin-screw extruder. Furthermore, 89 parts by mass of liquid paraffin was supplied from the side feeder of the twin-screw extruder, melt-kneaded, and a polyethylene resin solution was prepared in the extruder.

[0330] Next, a polyethylene resin solution was extruded at 210° C. from a die installed at the front end of the extruder, and an unstretched gel-like sheet was formed while being pulled by a cooling roll whose internal cooling water temperature was kept at 25° C. . For the cooled gel-like sheet, preheating temperature / s...

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Abstract

The present invention addresses the problem of providing a microporous polyolefin film which makes it possible to obtain a battery having excellent characteristics at low temperatures (e.g., about 0 DEG C). The present invention relates to a microporous polyolefin film which satisfies the relationship: (average number of pores)>=(160-2.3*10<-3>*toughness).

Description

technical field [0001] The present invention relates to a polyolefin microporous membrane, a battery separator and a secondary battery. Background technique [0002] Thermoplastic resin microporous membranes are widely used as material separation membranes, permselective membranes, separators, and the like. Specific uses of microporous membranes are, for example, battery separators for lithium-ion secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, and polymer batteries, separators for electric double-layer capacitors, reverse osmosis filtration membranes, ultra- Various filters such as filter membranes and microfiltration membranes, moisture-permeable waterproof clothing, medical materials, supports for fuel cells, etc. [0003] In particular, microporous membranes made of polyethylene are widely used as separators for lithium ion secondary batteries. Its characteristics include not only excellent mechanical strength, which greatly contributes to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J9/26C08J9/28H01M50/417H01M50/489H01M50/491H01M50/494
CPCC08J9/28C08J9/26Y02E60/10C08J5/18C08J2323/06H01M50/491H01M50/489H01M50/417H01M50/411
Inventor 石原毅丰田直树田中宽子中岛龙太藤原聪士山崎高志大仓正寿
Owner TORAY IND INC
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