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Polyolefin-based microporous film, laminate, and nonaqueous electrolyte secondary battery using same

A technology of microporous membrane and polyolefin, which is applied in the direction of non-aqueous electrolyte batteries, secondary batteries, non-aqueous electrolytes, etc., can solve the problems of shortened charging and discharging time, reduced battery capacity, and reduced number of ions, achieving excellent strength, The effect of improving the capacity maintenance rate

Pending Publication Date: 2022-03-01
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the case of rapidly charging and discharging a lithium ion secondary battery, since the charging and discharging time is shortened, there is a problem that the time for lithium ions to permeate into fine parts of the electrode is shortened, and lithium ions are efficiently taken in and out. The number of ions decreases, the battery capacity will decrease

Method used

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  • Polyolefin-based microporous film, laminate, and nonaqueous electrolyte secondary battery using same
  • Polyolefin-based microporous film, laminate, and nonaqueous electrolyte secondary battery using same
  • Polyolefin-based microporous film, laminate, and nonaqueous electrolyte secondary battery using same

Examples

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preparation example Construction

[0089] (a) Preparation process of polyolefin resin solution

[0090] The polyolefin-based resin used in the embodiment of the present invention is heated and dissolved in a plasticizer to prepare a polyolefin-based resin solution. The plasticizer is not limited as long as it is a solvent that can sufficiently dissolve the polyolefin-based resin. Since stretching at a relatively high ratio is possible, the solvent is preferably liquid at room temperature.

[0091] Examples of solvents include aliphatic, cycloaliphatic or aromatic hydrocarbons such as nonane, decane, decalin, p-xylene, undecane, dodecane, and liquid paraffin, and minerals having boiling points corresponding to them. Oil fractions, and phthalates that are liquid at room temperature, such as dibutyl phthalate and dioctyl phthalate. In order to obtain a gel-like sheet with a stable liquid solvent content, it is preferable to use a non-volatile liquid solvent such as liquid paraffin.

[0092] The ratio of the solv...

Embodiment 1

[0198] Use a weight average molecular weight (Mw) of 10×10 5 The ultra-high molecular weight polyethylene and the weight average molecular weight (Mw) are 5×10 5 high-density polyethylene as raw material. Add 80 parts by mass of liquid paraffin to 16 parts by mass of ultra-high molecular weight polyethylene and 4 parts by mass of high-density polyethylene, and then add and mix 0.5 parts by mass of 2,6-di-tert-butyl based on the total mass of polyethylene-based resins Base-p-cresol and 0.7 mass parts of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] methane as antioxidant, prepare polyethylene resin solution . In addition, when the mass of all polyethylene-type resins was 100 mass %, the ratio of the ultrahigh molecular weight polyethylene was 80 mass %. Since most of liquid paraffin and antioxidants are removed in the production process, in the present invention, the ratio of ultra-high molecular weight polyethylene when the mass of all polyethylene r...

Embodiment 2

[0203] For stretching in the longitudinal direction (MD direction) by a roll stretching machine, the first stage (MD1) is set to 118°C, 4 times (described in the table as longitudinal stretch (MD1)), the second stage (MD2 ) was set to 118° C. and 2 times (in the table, it is described as longitudinal stretching (MD2)), and stretching was carried out in two stages, and a polyolefin-based microporous membrane was obtained in the same manner as in Example 1.

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Abstract

The present invention relates to a polyolefin-based microporous membrane in which, in a three-dimensional image of 2.7 [mu] m * 2.7 [mu] m * 2.7 [mu] m produced from each cross-sectional image of the microporous membrane obtained by FIB-SEM measurement, the number of pores in the thickness direction is 35 / [mu] m2 or more, and the peak value of the tortuosity distribution of the pores in the thickness direction is 1.30-1.80.

Description

technical field [0001] The present invention relates to a polyolefin-based microporous film, a laminate, and a nonaqueous electrolyte secondary battery using the same. Background technique [0002] Thermoplastic resin microporous membranes are widely used as separation membranes, permselective membranes, and separators of objects. Specific applications of the microporous membrane are, for example, separators for non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, and polymer batteries, separators for electric double-layer capacitors, reverse Osmotic filtration membrane, ultrafiltration membrane, microfiltration membrane and other filters; waterproof and moisture-permeable clothing materials, medical materials, fuel cell supports, etc. [0003] In particular, microporous films made of polyethylene are widely used as separators for lithium ion secondary batteries. As its characteristics, in...

Claims

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Application Information

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IPC IPC(8): H01M50/417H01M50/491H01M50/449H01M10/0525
CPCH01M50/417H01M50/491H01M50/449H01M10/0525H01M10/052H01M10/0566B32B5/18C08J9/26B32B27/32Y02E60/10H01M50/489B01D71/26H01M2300/0025
Inventor 坂本光隆丰田直树中岛龙太藤原聪士石原毅大仓正寿久万琢也
Owner TORAY IND INC
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