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Battery isolating membrane preparation method

A separator and battery technology, applied in the field of electrochemistry, can solve the problems of high raw material and process costs, high requirements for ceramic slurry, and the inability to reduce the closed cell temperature of the separator at the same time

Inactive Publication Date: 2017-02-22
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the safety of lithium-ion battery separators, the most common method is to apply ceramic slurry to the polyolefin porous membrane. Although the coating treatment can significantly increase the membrane rupture temperature of the polyolefin porous membrane, it cannot simultaneously Reduce the closed cell temperature of the diaphragm, and the coating process has high requirements for ceramic slurry, and the overall raw material and process costs are relatively high

Method used

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Examples

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preparation example Construction

[0030] The preparation method of the battery separator film in this field has some conventional steps, for example, but not limited to, including raw material mixing, the mixture is extruded by a twin-screw extruder and then extruded through a slit die to a casting cooling roll to form a ribbon, The ribbon is extracted and cleaned to obtain a thin film. However, the method of the present invention is different from the prior art in that it also includes a cross-linking step, and the raw material contains a cross-linking aid. The crosslinking can be radiation crosslinking or chemical crosslinking, and radiation crosslinking is preferred. The auxiliary crosslinking agent can be mercaptobenzothiazole, benzothiazole disulfide, N-cyclohexylbenzothiazole sulfenamide, oxydivinylbenzothiazole sulfenamide, tetramethylthiuram monosulfide, Tetramethylthiuram disulfide, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, diphenylguanidine, di-o-tolueneguanidine, ethylene thiourea, N...

Embodiment 1

[0062] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 for 100 grams 6 The ultra-high molecular weight polyethylene, 6.4 grams of antioxidant, 3.2 grams of cross-linking agent, and 2200 grams of mineral oil are added to the continuous batching and feeding kettle, and stirred at a speed of 50 rpm to mix the raw materials evenly.

[0063] The mixture is continuously fed into the twin-screw extruder, and the ultra-high molecular weight polyethylene, high-density polyethylene, antioxidant and auxiliary crosslinking agent are continuously dissolved in mineral oil in the twin-screw extruder at 180°C , And then continuously extruded by a twin-screw extruder at a speed of 200 rpm, the mixture continuously enters the slit die, the mixture is extruded through the slit die to the casting cooling roll, and it is cast at 80°C. Ribbon.

[0064] Put the obtained ribbon into an extraction tank containing dichloromethane for extraction to remove t...

Embodiment 2

[0067] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 for 100 grams 6 The ultra-high molecular weight polyethylene, 6.4 grams of antioxidant, 3.2 grams of cross-linking agent, and 2200 grams of mineral oil are added to the continuous batching and feeding kettle, and stirred at a speed of 50 rpm to mix the raw materials evenly.

[0068] The mixture is continuously fed into the twin-screw extruder, and the ultra-high molecular weight polyethylene, high-density polyethylene, antioxidant and auxiliary crosslinking agent are continuously dissolved in mineral oil in the twin-screw extruder at 180°C , And then continuously extruded by a twin-screw extruder at a speed of 200 rpm, the mixture continuously enters the slit die, the mixture is extruded through the slit die to the casting cooling roll, and it is cast at 80°C. Ribbon.

[0069] Put the obtained ribbon into an extraction tank containing dichloromethane for extraction to remove t...

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Abstract

The invention discloses a battery isolating membrane preparation method. Mixed raw materials are extruded, cooled, formed, extracted, stretched and heat-set to obtain a battery isolating membrane. The raw materials include ultra-high molecular weight polyethylene, high-density polyethylene, antioxidants and pore-forming agents, the molecular weight of the ultra-high molecular weight polyethylene is 1.0*10<6>-10.0*10<6>, the density of the high-density polyethylene ranges from 0.940g / cm<3> to 0.976g / cm<3>, and the method includes cross-linking.

Description

Technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for preparing a battery isolation membrane. Background technique [0002] Lithium-ion batteries usually mainly consist of a positive electrode, a negative electrode, a separator, an electrolyte, and a battery casing. In the structure of lithium-ion batteries, the diaphragm is one of the key internal components. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent direct contact between the positive and negative electrodes and short-circuit, and at the same time to enable the electrolyte ions to pass smoothly during the charging and discharging process of the battery, forming a current, and abnormal battery operating temperature When rising, close the migration channel of electrolyte ions and cut off the current to ensure battery safety. It can be seen that the performance of the separator determines the interface st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/406H01M50/446
CPCH01M50/403H01M50/406Y02E60/10
Inventor 程跃熊磊邓洪贵何方波王伟强
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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