Separator for battery and method for producing same

A separator and battery technology, which is applied in the field of battery separator and its manufacturing, can solve the problems of polyolefin porous membrane rupture, etc., and achieve the effects of less water, heat shrinkage inhibition, and low rise

Pending Publication Date: 2022-03-18
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if the temperature continues to rise after the pores are clogged for some reason, the polyolefin porous membrane may be ruptured due to the decrease in the viscosity of the polyolefin constituting the membrane and the shrinkage of the membrane.

Method used

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  • Separator for battery and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0216] [Production of battery separator]

[0217] 1 part by weight of sodium carboxymethylcellulose was added to 100 parts by weight of water, and stirred at 600 rpm for 120 minutes with a three-in-one motor (manufactured by Toki Sangyo Co., Ltd.) equipped with dispersing blades. Furthermore, 1.14 parts by weight of the above-mentioned barium sulfate A was added with stirring to 100 parts by weight of water, followed by further stirring for 60 minutes to obtain a liquid mixture.

[0218] For the obtained mixed solution, using a bead mill disperser (Pico Mill PCM-LR manufactured by Asada Iron Works Co., Ltd.) and zirconia grinding beads (TORAYCERAM φ0.5 mm manufactured by Toray Co., Ltd.) with a grinding bead particle size of 0.5 mm, in Dispersion mixing was performed twice under the conditions of a bead filling rate of 75% by volume, a peripheral velocity of 10m / sec, and a flow velocity of 16kg / hr to obtain a masterbatch liquid.

[0219] 3.5 parts by weight of an acrylic resi...

Embodiment 2

[0223] The total of the barium sulfate particles and the organic synthetic resin components in the heat-resistant porous layer is set as 100% by volume, the barium sulfate particles are 71.0% by volume, and the organic synthetic resin components are 29.0% by volume (dispersant: 5.8% by volume, adhesive agent: 23.2 volume %), barium sulfate particles contained in the heat-resistant porous layer is 7.4g / m 2 , except that, it carried out similarly to Example 1, and obtained the separator for batteries.

Embodiment 3

[0225] The total of the barium sulfate particles and the organic synthetic resin component in the heat-resistant porous layer is set as 100% by volume, the barium sulfate particle is 80.0% by volume, and the organic synthetic resin component is 20.0% by volume (dispersant: 4.0% by volume, adhesive agent: 16.0% by volume), the barium sulfate particles contained in the heat-resistant porous layer are 8.3g / m 2 , except that, it carried out similarly to Example 1, and obtained the separator for batteries.

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Abstract

The present invention relates to a battery separator comprising a polyolefin porous film and a heat-resistant porous layer provided on at least one surface of the polyolefin porous film, the heat-resistant porous layer comprising barium sulfate particles and an organic synthetic resin component, the content of the barium sulfate particles, the increase in gas resistance per 1 [mu] m thickness of the heat-resistant porous layer, the shrinkage rate when left to stand for 1 hour in a 130 DEG C atmosphere, and the hydrogen sulfide concentration are within predetermined ranges.

Description

technical field [0001] The present invention relates to a battery separator comprising a polyolefin porous membrane and a heat-resistant porous layer on at least one side of the polyolefin porous membrane, and a method for producing the same. The battery separator according to the embodiment of the present invention can be used as a lithium ion secondary battery separator. Background technique [0002] Thermoplastic resin porous membranes are widely used in the separation of substances, selective permeation and isolation materials. For example, lithium-ion secondary batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and polymer batteries are used for battery separators, separators for electric double-layer capacitors, reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes. Various filters, Moisture-permeable waterproof clothing, and medical materials, etc. [0003] In particular, as a separator for a lithium-ion sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/417H01M10/0525H01M50/403H01M50/434H01M50/449H01M50/491
CPCH01M50/403H01M50/417H01M50/434H01M50/449H01M50/491H01M10/0525H01G11/84H01G11/52Y02E60/10H01M50/414H01M50/443H01M50/451H01M50/489H01G9/02H01M50/409H01M50/42
Inventor 萩原辰德越前绢似二宫裕一水野直树
Owner TORAY IND INC
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