Pore forming agent removal method of battery diaphragm and preparation process of lithium ion secondary battery diaphragm

A preparation process and secondary battery technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of thick substrate extraction difficulties, achieve the effects of shortening extraction time, solving extraction difficulties, and accelerating extraction rates

Active Publication Date: 2018-06-19
四川卓勤新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for removing the pore-forming agent of the battery diaphragm, which ca

Method used

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  • Pore forming agent removal method of battery diaphragm and preparation process of lithium ion secondary battery diaphragm

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Example Embodiment

[0027] Example one

[0028] A method for removing a pore-forming agent of a battery diaphragm, which is applied to the preparation process of a lithium ion secondary battery diaphragm. The steps of the method include:

[0029] The diaphragm substrate is pretreated by the equipment to remove at least a part of the pore former in the diaphragm substrate in advance; in this embodiment, the pore former is white oil, but it is not limited to this; when the white oil is at 40°C, the kinematic viscosity 45-55mm 2 / s;

[0030] The pre-processed diaphragm substrate is extracted by ultrasonic extraction to extract the pore-forming agent and ensure that the residual rate of the pore-forming agent in the final battery diaphragm is less than 1%.

[0031] In the ultrasonic extraction process, the ultrasonic frequency is 17KHz, and the ultrasonic extraction time is 10min.

[0032] The equipment includes a scraping roller set with at least one pair of scraping rolls 1 and a vacuum suction device with ...

Example Embodiment

[0045] Example two

[0046] This embodiment is basically the same as the first embodiment, except that during the ultrasonic extraction process, the ultrasonic frequency is 28KHz, and the ultrasonic extraction time is 10 minutes.

Example Embodiment

[0047] Example three

[0048] This embodiment is basically the same as the first embodiment, except that during the ultrasonic extraction process, the ultrasonic frequency is 17KHz, and the ultrasonic extraction time is 15min.

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Abstract

The invention discloses a pore forming agent removal method of a battery diaphragm and a preparation process of a lithium ion secondary battery diaphragm. The pore forming agent removal method of thebattery diaphragm comprises the following steps: pretreating a diaphragm substrate by virtue of a device, and removing at least a part of pore forming agent in the diaphragm substrate in advance; andextracting the pretreated diaphragm substrate by virtue of ultrasonic extraction, extracting the pore forming agent, and ensuring that the residual rate of the pore forming agent of the finally prepared battery diaphragm is less than 1 percent. By adopting the pore forming agent removal method of the battery diaphragm and the preparation process of the lithium ion secondary battery diaphragm, theextraction speed of the battery diaphragm can be increased on the premise of not increasing the length of a battery production line, not improving the device precision and not improving the personal skill; and moreover, the method is particularly suitable for extracting a thicker diaphragm substrate and solves the problem that the thicker substrate is difficult to extract.

Description

technical field [0001] The invention relates to a method for removing a pore-forming agent of a battery diaphragm and a preparation process for a lithium-ion secondary battery diaphragm. Background technique [0002] At present, lithium-ion secondary batteries have been widely used in consumer electronics, electric vehicles and energy storage fields due to their high energy density and long cycle life. As more and more diaphragm production lines are put into production, the competition among diaphragm companies is becoming more and more intense. At present, most enterprises increase production by increasing the number of production lines. There is no technological innovation, and the investment is large and the cycle is long. Once the predetermined goal is not achieved, major losses will be caused. [0003] In the BOPP industry, the film produced is a non-porous film, and there is no need to add a pore-forming agent to the film and extract it, so the speed of the producti...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 李大伟顾杨建中山生龙
Owner 四川卓勤新材料科技有限公司
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