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Polyethylene nuclear pore membrane for lithium battery and preparation method

A polyethylene and lithium battery technology, applied in the field of membrane materials, can solve the problems of difficult control of pore size and porosity, poor transverse strength, environmental pollution, etc., and achieve the effects of easy control of pore size and porosity, low cost and easy process control

Inactive Publication Date: 2018-07-13
天津市协和医药科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of solvent is required in the preparation process, which is easy to cause environmental pollution, and the process is relatively complicated
The process of melt drawing method does not include phase separation process, which is easy to industrialized production and has no pollution. Only longitudinal stretching is carried out, the transverse strength of the film is poor, and the equipment is expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A preparation method of a polyethylene nuclear pore separator for a lithium battery, comprising the following steps: irradiating a polyethylene film with a thickness of 30 μm for 0.5 seconds with 20 MeV heavy ions Au generated by an accelerator; Then immerse in the mixed solution at 60°C, etch for 60min, then soak in 5% sodium hydroxide aqueous solution at room temperature for 10min, ultrasonically clean with deionized water for 3 times, each time for 10min, and dry at 60°C, that is A polyethylene nuclear pore membrane for lithium batteries is obtained; the mixed solution is formed by mixing a 30% sodium hypochlorite aqueous solution with a mass concentration of 30% and a 20% hydrochloric acid aqueous solution with a volume ratio of 1:1.

[0013] Polyethylene nuclear pore membrane for lithium batteries has a thickness of 30 μm, an etched pore diameter of 1 μm, and a pore density of 5×10 10 cm -2 , with a porosity of 45%.

Embodiment 2

[0015] A preparation method of a polyethylene nuclear pore diaphragm for a lithium battery, comprising the following steps: irradiating a polyethylene film with a thickness of 10 μm for 0.1 second with 10 MeV heavy ions Kr generated by an accelerator; Then immerse in the mixed solution at 30°C, etch for 20 minutes, then soak in 3% sodium hydroxide aqueous solution at room temperature for 2 minutes, ultrasonically clean with deionized water for 3 times, each time for 10 minutes, and dry at 40°C, that is A polyethylene nuclear pore membrane for a lithium battery is obtained; the mixed solution is formed by mixing a 20% sodium hypochlorite aqueous solution with a mass concentration of 10% and a 10% hydrochloric acid aqueous solution with a volume ratio of 1:1.

[0016] The polyethylene nuclear pore membrane for lithium batteries has a thickness of 10 μm, an etched pore diameter of 0.05 μm, and a pore density of 8.5×10 8 cm -2 , the porosity is 35.0%.

Embodiment 3

[0018] A method for preparing a polyethylene nuclear pore separator for a lithium battery, comprising the following steps: irradiating a polyethylene film with a thickness of 15 μm for 0.01 seconds with 15 MeV heavy ions Au generated by an accelerator; Then immerse in the mixed solution at 45°C, etch for 55min, then soak in 4.5% sodium hydroxide aqueous solution at room temperature for 7min, ultrasonically clean with deionized water for 3 times, each time for 10min, and dry at 50°C, that is A polyethylene nuclear pore membrane for a lithium battery is obtained; the mixed solution is formed by mixing a 20% sodium hypochlorite aqueous solution with a mass concentration of 20% and a 20% hydrochloric acid aqueous solution with a volume ratio of 2:1.

[0019] The polyethylene nuclear pore membrane for lithium batteries has a thickness of 15 μm, an etched pore diameter of 0.2 μm, and a pore density of 5.0×10 8 cm -2 , the porosity is 42.5%.

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Abstract

The invention discloses a polyethylene nuclear pore membrane for a lithium battery and a preparation method. The method comprises the steps of irradiating a polyethylene film by using heavy ions Au orKr generated from an accelerator; carrying out sensitization in ultraviolet light; and immersing a product into a mixed solution, etching, and then soaking, cleaning and drying in a sodium hydroxideaqueous solution at room temperature to obtain the polyethylene nuclear pore membrane for the lithium battery. The method disclosed by the invention is relatively simple, the process is easy to control, the aperture is uniform, the hole density is high, the aperture and the porosity are easy to control, the cost is relatively low and the used reagent is easy to get.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a polyethylene nuclear pore separator for lithium batteries and a preparation method thereof. Background technique [0002] Since Sony successfully developed lithium batteries in the early 1990s, lithium batteries have developed rapidly due to their excellent electrical properties such as high energy density, long cycle life and high voltage. At present, it has been widely used in electronic products such as mobile phones, portable computers, cameras, video cameras and electric vehicles, and the application fields are still expanding. The separator is one of the key inner components of a lithium battery. Its main function is to isolate the positive and negative electrodes and prevent electrons from passing through, while allowing ions to pass through, thereby completing the rapid transmission of lithium ions between the positive and negative electrodes duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/491
CPCH01M50/403H01M50/411Y02E60/10
Inventor 阎尓坤沈明哲魏顺新黄泾清贾通
Owner 天津市协和医药科技集团有限公司
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