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High-strength composite lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and composite technology, which is applied to battery pack components, circuits, electrical components, etc., can solve problems such as increased use costs, large resistance, and elevated temperature of lithium batteries

Inactive Publication Date: 2019-04-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to add another membrane, which increases the cost of the membrane, and also leads to a higher resistance of the membrane, which will increase the internal temperature of the lithium battery.

Method used

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  • High-strength composite lithium battery diaphragm and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a high-strength, composite lithium battery diaphragm is as follows:

[0026] A high-strength, composite lithium battery separator consists of: 120 parts by mass of a base material, 24 parts of a reinforcing agent, 9 parts of a toughening agent, 12 parts of a macromolecular porogen, 2 parts Antioxidant, 12 parts of auxiliary agent, 3 parts of lubricant;

[0027] The preparation method of a high-strength, composite lithium battery diaphragm is as follows: 120 parts by mass of base material, 24 parts of reinforcing agent, 9 parts of toughening agent, 12 parts of macromolecular pore-forming Agent, 2 parts of antioxidant, 12 parts of auxiliary agent, and 3 parts of lubricant are added to the mixer for mixing. After mixing evenly, the materials are added to the twin-screw film blowing machine for blown film forming, and the blown film is controlled. Air pressure is used to control the thickness of the film to obtain a film with a thickness of 10-40 mi...

Embodiment 2

[0036] A preparation method of a high-strength, composite lithium battery diaphragm is as follows:

[0037] A high-strength, composite lithium battery separator consists of: 110 parts by mass of a base material, 25 parts of a reinforcing agent, 6 parts of a toughening agent, 15 parts of a macromolecular porogen, 4 parts Antioxidant, 12 parts of auxiliary agent, 3 parts of lubricant;

[0038] The preparation method of a high-strength, composite lithium battery diaphragm is as follows: 110 parts by mass of base material, 25 parts of reinforcing agent, 6 parts of toughening agent, 15 parts of macromolecular pore-forming Agent, 4 parts of antioxidant, 12 parts of auxiliary agent, and 3 parts of lubricant are added to the mixer for mixing. After mixing evenly, the materials are added to the twin-screw film blowing machine for blown film forming, and the blown film is controlled. Air pressure is used to control the thickness of the film to obtain a film with a thickness of 10-40 mi...

Embodiment 3

[0047] A preparation method of a high-strength, composite lithium battery diaphragm is as follows:

[0048] A high-strength, composite lithium battery separator consists of: 120 parts by mass of a base material, 30 parts of a reinforcing agent, 10 parts of a toughening agent, 20 parts of a macromolecular porogen, 5 parts Antioxidant, 15 parts of auxiliary agent, 5 parts of lubricant;

[0049] The preparation method of a high-strength, composite lithium battery diaphragm is as follows: 120 parts by mass of a base material, 30 parts of a reinforcing agent, 10 parts of a toughening agent, and 20 parts of a macromolecular pore-forming Agent, 5 parts of antioxidant, 15 parts of auxiliary agent, and 5 parts of lubricant are added to the mixer for mixing. After mixing evenly, the materials are added to the twin-screw film blowing machine for blown film forming, and the blown film is controlled. Air pressure is used to control the thickness of the film to obtain a film with a thickne...

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Abstract

The invention relates to the technical field of lithium battery diaphragms and in particular to a high-strength composite lithium battery diaphragm and a preparation method thereof. The high-strengthcomposite lithium battery diaphragm comprises components: by weight, 100 to 120 parts of base material, 20 to 30 parts of reinforcing agent, 5 to 10 parts of toughening agent, 10 to 20 parts of macromolecular pore-foaming agent, 2 to 5 parts of antioxidant, 10 to 15 parts of adjuvant, and 2 to 5 parts of lubricant. the lithium battery diaphragm of the invention is prepared by a film-blowing forming and macromolecular pore formation method, and has good high temperature resistance and a relatively high obturator temperature and diaphragm rupture temperature difference. When the working temperature rises during the use of the battery, the migration channel of electrolyte ions can be quickly closed to stop the passage of ions and thus ensure the safety of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery separators, and in particular relates to a high-strength, composite lithium battery separator and a preparation method thereof. Background technique [0002] Nowadays, power lithium batteries are usually mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and lithium battery casings. In the structure of power ion lithium batteries, diaphragms are very critical internal components. The main function of the separator is to separate the positive and negative electrode materials of the lithium battery, prevent the short circuit phenomenon caused by the direct contact of the positive and negative electrode materials, and at the same time enable the ions in the electrolyte to pass through the lithium battery smoothly to form Current; when the temperature rises during the working process of the lithium battery, it can close the migration channel of the electroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411
CPCH01M50/446H01M50/403Y02E60/10
Inventor 曲大为于锋
Owner JILIN UNIV
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