Heat-resistant synthetic resin microporous film, method for manufacturing same, separator for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell

A technology of microporous membranes and synthetic resins, which can be used in the manufacture of secondary batteries, battery components, and final products. It can solve the problems of insufficient heat resistance of the separator and achieve excellent ion permeability and heat resistance. Effect

Inactive Publication Date: 2016-12-14
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of separators for lithium-ion secondary batteries is still insufficient only by electron beam irradiation treatment.

Method used

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  • Heat-resistant synthetic resin microporous film, method for manufacturing same, separator for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell
  • Heat-resistant synthetic resin microporous film, method for manufacturing same, separator for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell
  • Heat-resistant synthetic resin microporous film, method for manufacturing same, separator for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and comparative example 1

[0215] 1. Fabrication of Homopolypropylene Microporous Membrane

[0216] (extrusion process)

[0217] Homopolypropylene (weight-average molecular weight: 400,000, number-average molecular weight: 37,000, melt flow rate: 3.7g / 10min, with 13 The isotactic pentad fraction measured by the C-NMR method: 97%, melting point: 165°C) was supplied to a single screw extruder, and melt-kneaded at a resin temperature of 200°C. Next, the melt-kneaded homopolypropylene was extruded from the T-die installed at the front end of the single-screw extruder onto a casting roll with a surface temperature of 95°C, and cooled to the surface temperature of the homopolypropylene by blowing cold air. It becomes 30°C. Thus, a strip-shaped homopolypropylene film (width 200 mm) was obtained. In addition, the extrusion amount was 10 kg / hour, the film forming speed was 22 m / minute, and the draw ratio was 83.

[0218] (maintenance process)

[0219] The obtained strip-shaped homopolypropylene film (50 m i...

Embodiment 15

[0235] 1. Fabrication of Laminated Synthetic Resin Microporous Membrane

[0236] Using the homopolypropylene used in Example 1, a tape-shaped homopolypropylene film (200 mm in width) was obtained in the same manner as in Example 1 from a single-screw extruder equipped with a T-die. The film thickness was 12 μm. Here, the extrusion amount was set at 7 kg / hour, the film forming speed was set at 10 m / min, and the draw ratio was set at 208.

[0237] High-density polyethylene (density: 0.964g / cm 3 , melt flow rate: 5.2 g / 10 minutes, melting point: 135°C) was supplied to a single-screw extruder, and melt-kneaded at a resin temperature of 175°C. Next, the melt-kneaded high-density polyethylene is extruded from the T-die installed at the front end of the single-screw extruder onto a casting roll with a surface temperature of 90°C, and cooled to the surface of the high-density polyethylene by blowing cold air. The temperature was 30°C. Thus, a strip-shaped high-density polyethylene...

Embodiment 16

[0258] A homopolypropylene microporous membrane was prepared in the same manner as in Example 1. A coating liquid was produced in the same manner as in Example 1, and this coating liquid was applied to the surface of the homopolypropylene microporous membrane. Ethyl acetate was evaporated and removed by heating the homopolypropylene microporous membrane at 80° C. for 2 minutes. A polymerizable compound (trimethylolpropane triacrylate) was adhered to the homopolypropylene microporous membrane in an amount shown in Table 4 with respect to 100 parts by weight of the homopolypropylene microporous membrane.

[0259] (plasma treatment)

[0260] For homopolypropylene microporous membranes with polymeric compounds attached, use figure 1 The shown plasma processing apparatus performs plasma processing six times as follows. After the homopolypropylene microporous membrane B is hung on the guide roller 14, the second electrode 11b, and the guide roller 15, respectively, by rotating th...

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Abstract

The present invention provides a heat-resistant synthetic resin microporous film and a method for manufacturing same, said film having exceptional ion permeability and heat resistance. This heat-resistant synthetic resin microporous film is characterized in having: a synthetic resin microporous film that has micropore parts; and a coating layer that is formed on at least a part of the synthetic resin microporous film surface, said coating layer containing a polymer of a polymerizable compound that has two or more radical-polymerizable functional groups within the molecule; said film having a maximum heat shrinkage rate, when heated at a temperature increase of 5 DEG C / min from 25 to 180 DEG C, of 25% or less.

Description

technical field [0001] The present invention relates to a heat-resistant synthetic resin microporous membrane and a manufacturing method thereof. Also, the present invention relates to a separator for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery using the heat-resistant synthetic resin microporous membrane. Background technique [0002] Lithium-ion secondary batteries are used as power sources for portable electronic devices. A lithium ion secondary battery is generally constituted by arranging a positive electrode, a negative electrode, and a separator in an electrolytic solution. The positive electrode is formed by coating lithium cobaltate or lithium manganate on the surface of aluminum foil. The negative electrode is formed by coating carbon on the surface of copper foil. The separator is arranged to separate the positive electrode and the negative electrode, and prevents electrical short circuit between the electrodes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B05D3/06B05D7/04B05D7/24B32B5/18C08J7/04C08J9/36C08J7/046H01M50/403H01M50/406H01M50/417H01M50/42H01M50/449H01M50/489H01M50/491
CPCB05D7/04C08J7/18B05D2252/02C08J2433/06B05D3/068C08J2323/12C08J7/0427Y02E60/10H01M50/403H01M50/449C08J7/046H01M50/417H01M50/491H01M50/489H01M50/42H01M50/406H01M10/0525Y02P70/50B05D3/067C08J2205/044B32B5/18C08J9/365
Inventor 泽田贵彦多田博士
Owner SEKISUI CHEM CO LTD
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