Battery isolating membrane and preparing method thereof

A separator and battery technology, applied in the field of electrochemistry, can solve the problems of high requirements for ceramic slurry, inability to simultaneously reduce the closed-cell temperature of the diaphragm, and high cost of raw materials and processes

Inactive Publication Date: 2017-03-08
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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  • Battery isolating membrane and preparing method thereof
  • Battery isolating membrane and preparing method thereof
  • Battery isolating membrane and preparing method thereof

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preparation example Construction

[0030] There are some conventional steps in the preparation method of the battery separator film in the field, such as but not limited to, including raw material mixing, the mixture is extruded from the twin-screw extruder, and then extruded through the slit die to the casting cooling roll to form a strip, Extract and wash the ribbon to obtain a thin film. However, the method for preparing the battery separator of the present invention is different from the prior art in that it also includes a cross-linking step, and the raw material contains an auxiliary cross-linking agent. The crosslinking can be radiation crosslinking or chemical crosslinking, preferably radiation crosslinking. The auxiliary crosslinking agent can be mercaptobenzothiazole, benzothiazole disulfide, N-cyclohexylbenzothiazole sulfenamide, oxygen divinylbenzothiazole sulfenamide, tetramethylthiuram monosulfide, Tetramethylthiuram disulfide, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, diphenylgua...

Embodiment 1

[0062] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 in 100 grams 6 The ultra-high molecular weight polyethylene, 6.4 grams of antioxidant, 3.2 grams of auxiliary crosslinking agent, 2200 grams of mineral oil are added in the continuous batching feeding kettle, stirred at a speed of 50 rpm, and the raw materials are mixed 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, and the mixture is extruded through the slit die to the casting cooling roll, and cast at 80 ° C into Ribbon.

[0064] Put the obtained ribbon into an extraction tank containing dichloromethane for extract...

Embodiment 2

[0067] The density of 220 grams is 0.956g / cm 3 High-density polyethylene with a molecular weight of 5.0×10 in 100 grams 6 The ultra-high molecular weight polyethylene, 6.4 grams of antioxidant, 3.2 grams of auxiliary crosslinking agent, 2200 grams of mineral oil are added in the continuous batching feeding kettle, stirred at a speed of 50 rpm, and the raw materials are mixed 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, and the mixture is extruded through the slit die to the casting cooling roll, and cast at 80 ° C into Ribbon.

[0069] Put the obtained ribbon into an extraction tank containing dichloromethane for extract...

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Abstract

The invention discloses a battery isolating membrane and a preparing method thereof. The preparing method includes the steps that extrusion, cooling molding, extraction, stretching and thermoforming are carried out on mixed raw materials to obtain the battery isolating membrane. The raw materials include ultrahigh molecular weight polyethylene with the molecular weight of 1.0*10<6>-10.0*10<6>, high-density polyethylene with the density within the range of 0.940-0.976 g / cm<3>, antioxidant and a pore-forming agent. The method includes the step of crosslinking.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for preparing a battery separator. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the positive and negative electrodes from being directly contacted and short circuit, and at the same time enable the electrolyte ions to pass smoothly during the charging and discharging process of the battery, forming a current, and abnormality occurs when the battery operating temperature When it rises, the migration channel of electrolyte ions is closed, and the current is cut off to ensure the safety of the battery. It can be seen that the performance of the separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/406H01M50/489H01M50/491
CPCH01M50/403H01M50/491H01M50/406Y02E60/10
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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