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Ultra-thin and high-strength modified lithium-ion battery separator and preparation method thereof

A lithium-ion battery, high-strength technology, used in secondary batteries, battery pack components, circuits, etc., can solve the problems of poor liquid retention, easy to be broken down by electrolyte wettability, etc., achieve low thermal shrinkage, high Mechanical strength and heat resistance, the effect of good mechanical strength and heat resistance

Active Publication Date: 2022-08-05
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of polyethylene materials being easily broken down when used as a separator, the wettability of the electrolyte, and the poor liquid retention capacity, as well as the requirements for thinning the separator, the ultra-thin and high-strength modified lithium-ion battery separator and its preparation are provided. method

Method used

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  • Ultra-thin and high-strength modified lithium-ion battery separator and preparation method thereof
  • Ultra-thin and high-strength modified lithium-ion battery separator and preparation method thereof
  • Ultra-thin and high-strength modified lithium-ion battery separator and preparation method thereof

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Effect test

Embodiment 1

[0026] The preparation method of ultra-thin and high-strength modified lithium ion battery separator comprises the following steps:

[0027] (1) 60 parts by weight of ultra-high molecular weight polyethylene, 40 parts by weight of ultra-high molecular weight polyethylene, 5 parts by weight of silane coupling modified fumed silica, 0.1 part by weight of antioxidant, 400 parts by weight of The white oil is evenly mixed to obtain a mixture;

[0028] (2) The mixture is transported to a screw extruder, melted and extruded at 200°C, and a thick sheet is obtained by casting, and then the thick sheet is stretched 10 times longitudinally to obtain a thin sheet, and then transversely Stretching 9 times to obtain an oil-containing film, placing the oil-containing film in dichloromethane for extraction of white oil, drying to obtain a dry film, and then stretching the dry film horizontally by 1.2 times again to obtain a microporous film. The ultra-thin microporous membrane is obtained by...

Embodiment 2

[0031] The preparation method of ultra-thin and high-strength modified lithium ion battery separator comprises the following steps:

[0032] (1) 70 parts by weight of ultra-high molecular weight polyethylene, 30 parts by weight of ultra-high molecular weight polyethylene, 10 parts by weight of silane coupling modified fumed silica, 0.3 parts by weight of antioxidant, 300 parts by weight of The white oil is evenly mixed to obtain a mixture;

[0033] (2) The mixture is transported to a screw extruder, melted and extruded at 220° C. to obtain a thick sheet by casting, and then the thick sheet is longitudinally stretched by 12 times to obtain a thin sheet, and then transversely Stretching 10 times to obtain an oil-containing film, placing the oil-containing film in dichloromethane for extraction of white oil, drying to obtain a dry film, and then stretching the dry film horizontally by 1.1 times again to obtain a microporous film. The ultra-thin microporous membrane is obtained by ...

Embodiment 3

[0036] (1) 80 parts by weight of ultra-high molecular weight polyethylene, 20 parts by weight of ultra-high molecular weight polyethylene, 8 parts by weight of silane coupling modified fumed silica, 0.5 parts by weight of antioxidant, 350 parts by weight of The white oil is evenly mixed to obtain a mixture;

[0037] (2) The mixture is transported to a screw extruder, melted and extruded at 210°C, and a thick sheet is obtained by casting, and then the thick sheet is stretched 15 times longitudinally to obtain a thin sheet, and then transversely Stretching 13 times to obtain an oil-containing film, placing the oil-containing film in dichloromethane for extraction of white oil, drying to obtain a dry film, and then stretching the dry film horizontally by 1.1 times again to obtain a microporous film. The ultra-thin microporous membrane is obtained by pulling first through a hot roller at 100 °C, then through a cold roller below 30 °C for shaping, winding and slitting;

[0038] (3...

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Abstract

The invention relates to an ultra-thin and high-strength modified lithium-ion battery separator and a preparation method thereof, comprising the steps of: mixing 60-80 parts by weight of ultra-high molecular weight polyethylene, 20-40 parts by weight of ultra-high molecular weight polyethylene, 5-10 Silane-coupling-modified fumed silica in parts by weight, 0.1-0.5 parts by weight of antioxidant, and 200-400 parts by weight of white oil are uniformly mixed to obtain a mixture, which is melt-extruded, cast into a thick sheet, and then Biaxial stretching treatment, removing white oil, pulling and shaping, winding and slitting to obtain a microporous diaphragm with a film thickness of less than 4 μm; fluorinating the microporous diaphragm to obtain a fluorinated microporous diaphragm, and then irradiating After grafting treatment, washing and drying, an ultra-thin and high-strength modified lithium-ion battery separator is obtained. The modified diaphragm of the present invention has higher puncture strength and better electrolyte wettability and liquid retention capacity.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an ultra-thin and high-strength modified lithium-ion battery separator and a preparation method thereof. Background technique [0002] As a high-performance green battery, lithium-ion batteries have been widely used in various portable electronic products and communication equipment, and are also the preferred power source for hybrid vehicles and electric vehicles. With the rapid development of the lithium-ion battery industry, the research and development on the improvement of lithium-ion batteries has also become more and more in-depth. There are three main functions of the separator in lithium batteries: to isolate the positive and negative electrodes; to isolate the electrons from freely passing through; the micropores in the separator itself allow ions in the electrolyte to pass freely between the positive and negative electrodes. The performance of the separator ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 刘涛涛翁星星胡敏蒋涛孙爱斌贾培梁陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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