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Polyolefin microporous membrane

A technology of microporous membrane and polyolefin, applied in the direction of separator/film/diaphragm/spacer components, electrical components, circuits, etc., can solve problems such as deterioration and poor production efficiency, and achieve the effect of preventing thermal runaway

Active Publication Date: 2020-11-06
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since a chemical cross-linking reaction based on functional groups is required, there are technical problems of poor production efficiency or easy deterioration over time

Method used

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  • Polyolefin microporous membrane
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  • Polyolefin microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213]

[0214] Follow the steps below to fabricate polyolefin microporous membranes. The composition of the resin raw material is: as the first type polyethylene, 70 parts by mass of polyethylene having a melting point of 135°C, a viscosity average molecular weight of 700,000, and a molecular weight distribution of 5.0; and, as a second type polyethylene, a viscosity average molecular weight of 250,000 and a molecular weight distribution of 23 parts by mass of polyethylene of 5.0; and 7 parts by mass of isotactic polypropylene having a melting point of 161° C., a viscosity average molecular weight of 400,000, and a molecular weight distribution of 6.0 as polypropylene. 0.3 parts by mass of tetrakis-(methylene-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate)methane was mixed in the resin composition as an antioxidant. Each obtained mixture was charged into a twin-screw extruder using a feeder. Liquid paraffin (kinematic viscosity 75.90cSt at 37.78°C) as a pore-forming ma...

Embodiment 2～23 and comparative example 1～14

[0216] According to the production method of Example 1, the polyolefin microporous membranes of Examples 2-23 and Comparative Examples 1-14 were produced under the conditions described in Tables 1-9. It should be noted that, regarding the raw material composition, the first type polyethylene is represented as PE1, the second type polyethylene is represented as PE2, the third type polyethylene is represented as PE3, and the polypropylene is represented as PP. It should be noted that the expression of PE1 to PE3 is for convenience, and does not mean that the input order of raw materials in the present invention is limited to the order of PE1, PE2 and PE3.

[0217]

[0218] Through the following steps a to c, a positive electrode, a negative electrode and a non-aqueous electrolyte solution are prepared.

[0219] a. Production of positive electrode

[0220] Nickel, manganese, cobalt composite oxide (NMC) (Ni:Mn:Co=1:1:1 (element ratio), density 4.70g / cm 3 ) 90.4% by mass, grap...

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Abstract

A polyolefin microporous membrane which has a loss tangent (tan delta) of 0.35 or more but less than 0.60 at 230 DEG C as determined by melt viscoelasticity measurement.

Description

technical field [0001] The present invention relates to polyolefin microporous membranes. Background technique [0002] Polyolefin microporous membranes are used for separators for batteries, separators for capacitors, materials for fuel cells, microfiltration membranes, etc., and are particularly used as separators for lithium ion secondary batteries (LIB) or their constituent materials. The separator prevents direct contact between positive and negative electrodes, and is also permeable to ions through the electrolyte solution held in its micropores. [0003] In recent years, LIBs have been realized not only for small electronic devices such as cellular phones and notebook computers but also for electric vehicles such as electric cars and small electric bicycles. In automotive LIBs, the capacity per unit cell tends to increase in order to extend the cruising distance, so batteries with a large capacity per unit volume have been developed. Therefore, when a foreign object...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08J9/26H01M2/16H01M50/409H01M50/491H01M50/494
CPCC08L23/06C08J5/18Y02E60/10C08J2323/06C08J2423/12C08J9/26C08J9/28H01M50/417H01M50/491H01M50/409H01M50/494C08L23/12H01M50/403C08K5/105C08J2323/12H01M50/489Y02P70/50
Inventor 山下明久关口学
Owner ASAHI KASEI KK