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Battery separator, and method for producing same

一种电池、隔膜的技术，应用在电池用隔膜领域，能够解决不透气度升高、关闭功能降低、微孔堵塞等问题，达到不透气度升高率小、加工性低、优异耐热性的效果

Active Publication Date: 2014-06-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as a method of laminating the above-mentioned heat-resistant resin layer on the polyolefin-based porous film, generally, a method of coating a coating liquid containing a heat-resistant resin on the polyolefin-based porous film or a method of immersion, there are Lamination of thermal resins, clogging of micropores of polyolefin-based porous membranes, and increase in air-tightness
If the pore size of the polyolefin-based porous membrane is increased to reduce pore clogging, the important pore closure function that determines the safety of the separator will be reduced.

Method used

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  • Battery separator, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] (Synthesis of fluorine-containing resin)

[0134] As the fluorine-containing resin solution, KF polymer #1120 (polyvinylidene fluoride resin solution (175° C. melting point, 12% N-methylpyrrolidone solution) manufactured by Kureha Chemical Industry Co., Ltd.) was used.

[0135] A polyvinylidene fluoride resin solution, alumina particles with an average particle size of 0.5 μm, N-methyl-2-pyrrolidone, and zirconia beads (manufactured by Toray Corporation, "Torayceram" (registered trademark) beads, 0.5 mm in diameter) were put into a polypropylene container together, and dispersed for 6 hours using a paint shaker (manufactured by Toyo Seiki Seisakusho Co., Ltd.). Next, it filtered with the filter of 5 micrometers of filtration limits, and prepared the varnish.

[0136] The concentration of fluororesin in the solution is 2.1%, and the weight ratio of fluororesin (solid content) to particles is 8:92.

[0137] Apply the above-mentioned varnish to porous membrane A (porous ...

Embodiment 2

[0139] A battery separator was obtained in the same manner as in Example 1, except that the mixing ratio of the fluororesin solution, alumina particles, and N-methyl-2-pyrrolidone used in Example 1 was 16:19:65.

[0140] The concentration of fluorine-containing resin in the solution component is 2.4%, and the weight ratio of fluorine-containing resin (solid content) to particles is 9:91.

Embodiment 3

[0142] The mixing ratio of the fluororesin solution used in Example 1, alumina particles, and N-methyl-2-pyrrolidone was 10:14:76, except that it was performed in the same manner as in Example 1 to obtain a battery separator .

[0143] The concentration of fluorine-containing resin in the solution component is 1.4%, and the weight ratio of fluorine-containing resin (solid content) to particles is 8:92.

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Abstract

A battery separator in which a porous film (B) containing a fluorine-based resin and inorganic particles or crosslinking polymer particles is laminated on a porous film (A) comprising a polyolefin-based resin, wherein the content of the particles is between 80 and 97 weight% relative to porous film (B), the average particle size of the particles is equal to or greater than 1.5 times and is less than 50 times the average hole diameter of porous film (A), and specific formula (1) and specific formula (2) are fulfilled. The present invention provides a battery separator exhibiting excellent heat resistance and processability (electrolyte solution permeability, and low curling properties) and having an extremely low degree of increase of air permeation resistance caused by laminating a heat-resistant resin.

Description

technical field [0001] The present invention relates to a battery separator obtained by laminating a porous film containing a fluorine-containing resin and inorganic particles or crosslinked polymer particles on a porous film containing a polyolefin-based resin. In addition, it relates to a separator useful as a lithium-ion secondary battery separator having excellent heat resistance and excellent processability (electrolyte solution permeability, low curling properties) and ion permeability in a battery assembly process. A separator for a battery and a method for manufacturing the same. Background technique [0002] A thermoplastic resin porous membrane is widely used as a material for separating substances, a selectively permeable material, a barrier material, and the like. For example, for lithium-ion secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, battery separators used in polymer batteries, separators for electric double layer capacitors, rev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/32H01M50/403H01M50/417H01M50/42H01M50/426H01M50/431H01M50/451H01M50/491
CPCY02E60/12H01M2/1686B32B27/32H01M2/145H01M2/1646H01M2/1653H01M2/166H01M50/403H01M50/431H01M50/446H01M50/451H01M50/491H01M50/42H01M50/426H01M50/417Y02E60/10H01M50/449H01M10/0525B32B27/322
Inventor 水野直树入江达彦清水健
Owner TORAY IND INC
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