A kind of high strength, high thermal stability poly-4-methyl-1-pentene microporous membrane and preparation method thereof

A high thermal stability, microporous film technology, applied in flat products, other household appliances, structural parts, etc., can solve problems such as explosion, lithium battery short circuit, poor thermal shrinkage performance, etc., to achieve simple process operation, high liquid absorption Effect of liquid retention rate and high mechanical strength

Active Publication Date: 2020-06-26
HEFEI XINGYUAN NEW ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the separators of lithium-ion batteries prepared by thermal phase separation are mainly PE (polyethylene), which has good chemical stability and excellent physical properties. However, the melting point of commercial PE separators is below 150°C. At high temperature, the thermal shrinkage performance is poor. During the use of lithium-ion batteries, due to some reasons, the diaphragm is pierced and perforated, or the temperature of the battery rises due to internal or external effects, and the diaphragm shrinks or melts. The positive and negative electrodes of the battery are in direct contact, resulting in a short circuit or even explosion of the lithium battery, which limits the safe use of the lithium battery

Method used

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  • A kind of high strength, high thermal stability poly-4-methyl-1-pentene microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 50 parts of TPX (molecular weight is 1×10 5 , crystallinity is 30%), 0.05 part of antioxidant (antioxidant 1010), 50 parts of paraffin oil, TPX and antioxidant are delivered to the extruder in proportion, and then the paraffin oil is delivered to the extruder by the auxiliary machine Out of the machine, the TPX mixed melt is formed by plasticizing and miscible with the extruder, and cast into sheets by cooling rolls, and the TPX microporous membrane is obtained after biaxial stretching, extraction and drying, and heat treatment and setting. The working temperature of the extruder is 240 ℃, die head temperature 280 ℃, screw speed 50rpm / min, output pressure 15Mpa, cooling roll temperature 60 ℃, biaxial stretching ratio 8×10 times, setting temperature 120 ℃, setting time 1min, the product performance is shown in Table 1.

Embodiment 2

[0027] Weigh 25 parts of TPX (molecular weight is 5×10 6 , crystallinity is 60%), 1 part of antioxidant (antioxidant 168), 75 parts of paraffin oil, TPX and antioxidant are delivered to the extruder in proportion, and then the paraffin oil is delivered to the extruder by the auxiliary machine Out of the machine, the TPX mixed melt is formed by plasticizing and miscible by the extruder, and cast into sheets by cooling rollers, and the TPX microporous membrane is obtained after biaxial stretching, extraction and drying, and heat treatment and setting. The working temperature of the extruder is 280 ℃, die head temperature 300 ℃, screw speed 150rpm / min, output pressure 45Mpa, cooling roll temperature 60 ℃, biaxial stretching ratio 8×10 times, setting temperature 120 ℃, setting time 1min, the product performance is shown in Table 1.

Embodiment 3

[0029] Weigh 30 parts of TPX (molecular weight is 2×10 5 , crystallinity is 35%), 0.1 part of antioxidant (antioxidant 1010), 69.5 parts of paraffin oil, transport TPX and antioxidant to extruder in proportion, then paraffin oil is transported to extruder by auxiliary machine Out of the machine, the TPX mixed melt is formed by plasticizing and miscible with the extruder, and cast into sheets by cooling rolls, and the TPX microporous membrane is obtained after biaxial stretching, extraction and drying, and heat treatment and setting. The working temperature of the extruder is 240 ℃, die head temperature 280 ℃, screw speed 50rpm / min, output pressure 25Mpa, cooling roll temperature 60 ℃, biaxial stretching ratio 8×10 times, setting temperature 120 ℃, setting time 1min, the product performance is shown in Table 1.

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Abstract

The invention discloses a poly(4-methyl-1-pentene) microporous membrane with high strength and high thermal stability and a preparation method of the poly(4-methyl-1-pentene) microporous membrane. The membrane is prepared from 25 to 50 parts of poly(4-methyl-1-pentene) resin, 0.05 to 1 part of antioxidant and 50 to 75 parts of diluent; the poly(4-methyl-1-pentene) microporous membrane is prepared by the following working procedures: mixing and melting; extrusion molding; biaxial stretching; extracting and drying; heat treatment setting and the like. Compared with a polyolefin membrane, the poly(4-methyl-1-pentene) microporous membrane disclosed by the invention has the advantages of high thermal resistance, high mechanical strength, high liquid absorbing and retaining rate and the like. The thermal shrinkage rate of the poly(4-methyl-1-pentene) microporous membrane prepared by the preparation method disclosed by the invention in an MD direction is not greater than 3.0 at 105DEG C / 1h, the thermal shrinkage rate of the poly(4-methyl-1-pentene) microporous membrane in a TD direction is not greater than 2.0, the MD tensile strength is greater than 200MPa, the TD tensile strength is greater than 170MPa, and the air permeability range is 150+ / -50 sec / 100mL.

Description

technical field [0001] The invention relates to a lithium ion diaphragm material, specifically a poly(4-methyl-1-pentene) microporous membrane with high strength and high thermal stability and a preparation method thereof. The invention belongs to the technical field of manufacturing lithium ion secondary batteries . Background technique [0002] At present, the separators of lithium-ion batteries prepared by thermal phase separation are mainly PE (polyethylene), which has good chemical stability and excellent physical properties. However, the melting point of commercial PE separators is below 150°C. At high temperature, the thermal shrinkage performance is poor. During the use of lithium-ion batteries, due to some reasons, the diaphragm is pierced and perforated, or the temperature of the battery rises due to internal or external effects, and the diaphragm shrinks or melts. The positive and negative electrodes of the battery are in direct contact, resulting in a short circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/20C08L91/06C08J5/18H01M2/16H01M2/14B29D7/01B29B7/42B29B7/72B29C48/08B29C48/92
CPCB29B7/42B29B7/72B29D7/01B29C48/0018B29C48/08B29C48/92B29C2948/92704C08J5/18C08J2323/20C08J2391/06C08J2423/20C08J2491/06C08L23/20C08L91/06C08L2201/08C08L2203/16C08L2203/20H01M50/403H01M50/411Y02E60/10
Inventor 张龙王郗高东波
Owner HEFEI XINGYUAN NEW ENERGY MATERIAL CO LTD
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