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Material special for preparing lithium ion battery diaphragm and preparation method thereof

A technology for lithium-ion batteries and special materials, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problem that the mechanical strength of the film cannot meet the requirements of lithium-ion batteries, the strength of the battery diaphragm cannot meet the needs of automotive power batteries, and the processing technology Complicated and other problems, to achieve the effect of excellent comprehensive performance, good processing performance and excellent comprehensive performance

Inactive Publication Date: 2010-12-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the prepared battery separator is still difficult to meet the requirements of automotive power batteries
[0007] However, the following disadvantages still exist in the preparation of separators for high-capacity and high-power power batteries: 1. Poor processing performance and complex processing technology, such as ultra-high molecular weight polyethylene has high melt viscosity and poor melt fluidity; 2. Utilizing ordinary polyethylene To prepare lithium-ion battery separators, the mechanical strength is poor, and the mechanical strength of the film is difficult to meet the requirements of lithium-ion batteries, which may cause a short circuit and cause an explosion; Strong hydrophobicity, as a battery separator, generally requires the film to have a certain degree of hydrophilicity, so that the electrolyte can be well infiltrated and facilitate the free passage of ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 625 grams of polyethylene (melt index is 10g / min), 15 grams of di-tert-butyl peroxide (di-tert-butyl peroxide, C 8 h 18 o 2 ), 50 grams of vinyltriethoxysilane, 10 grams of three (2,4-di-tert-butylphenyl) phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) Octadecyl propionate is mixed with an antioxidant composed of a molar ratio of 1.5:1, melt-blended by a twin-screw extruder at 180°C, and undergoes an in-situ grafting reaction to obtain a polystyrene grafted with silane. vinyl. Then, the polyethylene grafted with silane and 300 grams of titanium dioxide whiskers (30 microns in length) were stirred and blended at a rotational speed of 1000-2000 rpm to prepare a special material for preparing lithium-ion battery separators. The special material is injection molded by an injection molding machine, the injection temperature is 200°C, the mold temperature is 50°C, and a standard mechanical test sample is obtained for testing.

[0039] The tensile strength of the speci...

Embodiment 2

[0042]860 grams of polyethylene (melt index is 20g / min), 5 grams of di-tert-butyl peroxide, 30 grams of vinyl triethoxysilane, 5 grams of three (2,4-di-tert-butylphenyl) Phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate are mixed with an antioxidant composed of a molar ratio of 2.5:1, and the mixture is produced by a twin-screw under the condition of 190°C. The extruder performs melt blending and in-situ grafting reaction to obtain polyethylene grafted with silane. Then, the polyethylene grafted with silane and 100 grams of titanium dioxide whiskers (50 microns in length) were stirred and blended at a rotation speed of 1000-2000 rpm to prepare a special material for preparing lithium-ion battery separators. The special material is injection molded by an injection molding machine, the injection temperature is 200°C, the mold temperature is 50°C, and a standard mechanical test sample is obtained for testing.

[0043] The tensile strength of the special ma...

Embodiment 3

[0046] 743 grams of polyethylene (melt index is 15g / min), 10 grams of di-tert-butyl peroxide, 40 grams of vinyltriethoxysilane, 7 grams of three (2,4-di-tert-butylphenyl) Phosphite and β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate are mixed with an antioxidant composed of a molar ratio of 2:1, and the mixture is produced by a twin-screw under the condition of 200°C. The extruder performs melt blending and in-situ grafting reaction to obtain polyethylene grafted with silane. Then, the polyethylene grafted with silane and 200 grams of titanium dioxide whiskers (40 microns in length) were stirred and blended at a rotational speed of 1000-2000 rpm to prepare a special material for preparing lithium-ion battery separators. The special material is injection molded by an injection molding machine, the injection temperature is 200°C, the mold temperature is 50°C, and a standard mechanical test sample is obtained for testing.

[0047] The tensile strength of the special m...

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Abstract

The invention relates to a material special for preparing a lithium ion battery diaphragm and a preparation method thereof. The material consists of the following components in part by weight: 62.5 to 86 parts of polyethylene, 0.5 to 1.5 parts of di-tert-butyl peroxide, 3 to 5 parts of vinyl triethoxy silane, 10 to 30 parts of titanium dioxide whiskers and 0.5 to 1 part of antioxidant. The preparation method comprises the following steps of: mixing the polyethylene, the di-tert-butyl peroxide, the antioxidant and the vinyl triethoxy silane, performing melt blending by using a double-screw extruder and performing an in-situ grafting reaction to obtain silane-grafted polyethylene; and stirring and blending the silane-grafted polyethylene and the titanium dioxide whiskers to obtain the material special for preparing the lithium ion battery diaphragm. The vinyl triethoxy silane is grafted on a polyethylene molecular chain and an ethyoxyl silane group can further react with the titanium dioxide whiskers so that a cross-linking reaction is realized in an entire membrane system and the intensity of a polyethylene membrane is enhanced.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm material, in particular to a special material and a preparation method for preparing the lithium-ion battery diaphragm. Background technique [0002] Lithium-ion secondary battery (rechargeable battery) has the characteristics of high specific energy, long cycle life, no memory effect, and has the advantages of safety, reliability, and fast charging and discharging, so it has become a hot spot in the research of new power supply technology in recent years. The battery separator is an important part of the liquid lithium-ion secondary battery. It plays the role of preventing the positive / negative short circuit in the battery and providing ion transport channels during the charging and discharging process. Its performance determines the interface structure and internal resistance of the battery. etc., which directly affect the capacity, cycle performance and safety performance of the battery, and t...

Claims

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Application Information

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IPC IPC(8): C08L51/06C08K13/04C08K7/08C08K5/526C08K5/134C08F255/02B29C47/92H01M2/16B29C48/92H01M50/403H01M50/446H01M50/489
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 曾钫赵建青吴水珠
Owner SOUTH CHINA UNIV OF TECH
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