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Polyolefin microporous membrane, separator for battery, and battery

A technology of microporous membrane and polyolefin, which is applied in battery components, circuits, electrical components, etc., can solve the problems of poor puncture strength and achieve high porosity, excellent puncture strength, excellent permeability and mechanical strength Effect

Active Publication Date: 2013-01-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A microporous membrane with a high porosity can be produced, for example, by using a pore-forming agent composed of an inorganic substance to form pores. However, such a microporous membrane has a problem of poor puncture strength.

Method used

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  • Polyolefin microporous membrane, separator for battery, and battery
  • Polyolefin microporous membrane, separator for battery, and battery
  • Polyolefin microporous membrane, separator for battery, and battery

Examples

Experimental program
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preparation example Construction

[0035] (1) Preparation of polyolefin solution

[0036] To the polyolefin solution prepared by melting and kneading the above-mentioned polyolefin and a film-forming solvent, various types of antioxidants, finely powdered silicic acid (pore forming agent), etc. additive.

[0037] The film-forming solvent is preferably liquid at room temperature in order to enable stretching at a relatively high ratio. Examples of liquid solvents include aliphatic, cycloaliphatic, or aromatic hydrocarbons such as nonane, decane, decalin, p-xylene, undecane, dodecane, and liquid paraffin, and minerals with corresponding boiling points. 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 nonvolatile liquid solvent such as liquid paraffin. In addition, a solvent that is mixed with the polyolefin in a melt-kneaded state but is solid at...

Embodiment 1

[0105] Prepared by the weight average molecular weight (Mw) of 5.6 × 10 5 , a molecular weight distribution (Mw / Mn) of 4.1, a terminal vinyl group concentration of 0.1 per 10,000 carbon atoms of high-density polyethylene (HDPE) 82% by mass, and a Mw of 2.0×10 6 , A polyethylene composition composed of 18% by mass of ultra-high molecular weight polyethylene (UHMWPE) whose Mw / Mn is 5. The melting point Tm of the polyethylene composition was 135°C, and the crystal dispersion temperature Tcd was 100°C.

[0106] Mw and Mw / Mn of UHMWPE and HDPE are determined by gel permeation chromatography (GPC) under the following conditions according to the method described in "Macromolecules, Vol.34, No.19, pp.6812-6820 (2001)" out (same below).

[0107] ・Measuring device: PL-GPC220 manufactured by Polymer Laboratories

[0108] Columns: Three PLgel Mixed-B Columns manufactured by Polymer Laboratories

[0109] ·Column temperature: 145℃

[0110] ・Solvent (mobile phase): 1,2,4-Trichlorobenzen...

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Abstract

A polyolefin microporous membrane which, in the pore size distribution curve determined by a mercury intrusion method, exhibits an S2 / S1 ratio (S2 / S1 100) of 25% or higher and an S3 / S1 ratio (S3 / S1 100) of 5% or lower [wherein S1 represents the volume of pores of 10 to 1,000nm in radius; S2 represents the volume of pores of 100 to 1,000nm in radius; and S3 represents the volume of pores of 500 to 1,000nm in radius]. Thus, provided are: a polyolefin microporous membrane which is thin and which has a high porosity and excellent permeability and mechanical strengths; a separator for a battery, using the microporous membrane; and a battery using the separator.

Description

technical field [0001] The present invention relates to a thin polyolefin microporous membrane having a high porosity and excellent permeability and mechanical strength, a battery separator using the microporous membrane, and a battery using the separator. Background technique [0002] Lithium-ion secondary batteries have a higher voltage than other secondary batteries such as nickel-hydrogen secondary batteries and nickel-cadmium secondary batteries, so they can obtain high energy density. However, when an internal short circuit occurs, heat may be released rapidly . Therefore, the separator for a lithium ion secondary battery needs to have a function (shutdown function) of stopping the battery reaction when an internal short circuit occurs. As separators for batteries, polyolefin microporous films have been used until now. The pores of the polyolefin microporous membrane are blocked due to the heat release of the battery, which blocks the ion conduction of the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08K3/00C08L23/04H01M2/16H01M50/417H01M50/489H01M50/491
CPCY02E60/12H01M2/1653Y02E60/10H01M50/417H01M50/491H01M50/489C08J9/28C08K3/00
Inventor 泷田耕太郎菊地慎太郎山田一博
Owner TORAY IND INC
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