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Laminated porous film, separator for lithium cell, and cell

一种多孔膜、叠层的技术，应用在非水电解质电池用隔板领域，能够解决两极间短路、膜破坏等问题，达到机械强度优异、尺寸稳定性优异、平衡良好有效物性的效果

Active Publication Date: 2011-10-05
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When abnormal heat generation occurs in the battery, a short circuit occurs between the two electrodes due to film damage due to heat shrinkage of the separator, and there is a risk of further heat generation, and further improvement in heat resistance is required.

Method used

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  • Laminated porous film, separator for lithium cell, and cell
  • Laminated porous film, separator for lithium cell, and cell
  • Laminated porous film, separator for lithium cell, and cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0238] With respect to 100 parts by mass of polypropylene resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3g / 10min), 3,9-bis[4-(N-cyclohexylamino) was added as a β crystal nucleating agent Formyl) phenyl]-2,4,8,0.1 mass part of 10-tetraoxaspiro[5.5]undecane, and utilize co-rotating twin-screw extruder (manufacture by Toshiba Machine Co., Ltd., caliber φ 40mm, screw rod effective Length L / D=32) was melt-kneaded at 280° C., and resin composition A1 processed into pellets was obtained.

[0239] In addition, high-density polyethylene (manufactured by Prime Polymer, Hi-Zex3300F, density: 0.950 g / cm 3 , MFR: 1.1g / 10 minutes) 20 mass parts of hydrogenated petroleum resin (manufactured by Arakawa Chemical Industry Co., Ltd., ALCONP115) was added to 80 mass parts, and a co-rotating twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., caliber φ35mm , screw effective length L / D=32) was melt-kneaded at 230° C., and resin composition B1 processed into pellets w...

Embodiment 2

[0243] After laminating the resin compositions A1 and B1 in the same manner as in Example 1, they were cooled and solidified with a casting roll at 125° C. to produce a laminated non-porous film.

[0244] The above-mentioned laminated non-porous film is sequentially biaxially stretched as follows: stretching to 3.8 times along MD at 110°C, then stretching to 2.5 times along TD at 105°C, and then relaxing 14% along TD at 115°C, A laminated porous membrane was obtained.

Embodiment 3

[0246]Add polypropylene-based copolymer resin (D101 manufactured by Sumitomo Chemical Co., Ltd., MFR: 0.5 g / 10 minutes) to 40 parts by mass of polypropylene-based resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3 g / 10 minutes) ) 60 parts by mass, 3,9-bis[4-(N-cyclohexylcarbamoyl) phenyl]-2,4,8,10-tetraoxaspiro[5.5]undeca as a β crystal nucleating agent 0.1 parts by mass of carbane, and utilize a co-rotating twin-screw extruder (manufactured by Toshiba Machinery Co., Ltd., caliber φ40mm, screw effective length L / D=32) to carry out melt kneading at 280° C. to obtain processed granular Resin Composition A2.

[0247] In addition, high-density polyethylene (manufactured by Prime Polymer, Hi-Zex3300F, density: 0.950 g / cm 3 , MFR: 1.1g / 10 minutes) 10 mass parts of hydrogenated petroleum resin (manufactured by Arakawa Chemical Industry Co., Ltd., ALCONP115) was added to 90 mass parts, and a co-rotating twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., c...

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Abstract

Provided is a laminated porous film having excellent shutdown characteristics and breakdown characteristics, good tearing strength and dimensional stability, and ss activity. The laminated porous film comprises layer A, the main component of which is a polypropylene resin, and layer B which contains a polyethylene resin, and the ratio of the tearing strength (HMD)in the machine direction (MD) of the laminated porous film and the tearing strength (HTD)in the transverse direction (TD) of the laminated porous film with respect to the machine direction (HMD / HTD)is 0.08 to 2.0.

Description

technical field [0001] The present invention relates to a laminated porous film which can be used for battery separators, packaging products, hygiene products, livestock products, agricultural products, construction products, medical products, separation films, light diffusion plates, and reflection sheets using the laminated porous film , and is particularly preferably used as a separator for a non-aqueous electrolyte battery such as a lithium ion secondary battery used as a power source of various electronic devices. Background technique [0002] Porous polymers having many fine interconnected pores are used in the following various fields: separation membranes used in the production of ultrapure water, purification of chemical solutions, water treatment, etc.; membranes used in clothing, hygiene materials, etc. Waterproof and moisture-permeable membrane; or battery separators used in batteries, etc. [0003] In particular, secondary batteries are widely used as power sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32H01M2/16H01M50/417H01M50/449H01M50/491H01M50/494
CPCB32B2323/04B32B2457/10H01M2/1653Y02E60/12H01M2/1686B32B2323/10H01M10/0525B32B2307/724Y02E60/122B32B38/0032B32B27/32B32B2305/026B32B5/32B32B7/12B32B27/08B32B3/26B32B2250/242B32B2307/50B32B2307/514B32B2307/54B32B2307/558B32B2307/581B32B2307/5825B32B2307/734B32B2307/736Y10T428/249953Y10T428/31913Y02E60/10H01M50/449H01M50/417H01M50/491H01M50/494H01M50/411
Inventor 寺川彻山本美保山田刚干宇佐见康
Owner MITSUBISHI CHEM CORP
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