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Film preparation method based on oil content feedback process

A technology of oil content and process, applied in the field of lithium battery separator and its preparation, can solve the problems of affecting the internal resistance of the battery, not mentioned, complicated operation, etc., to achieve high safety and high performance, and improve performance.

Active Publication Date: 2020-11-13
河南银金达新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this is time-consuming and labor-intensive, and multi-parameter crossover is difficult to control
At the same time, they did not realize that the consistency of the comprehensive performance of each parameter is of great significance to battery safety and performance improvement.
[0005] However, if a method that can comprehensively characterize each parameter is selected for process control, the control accuracy of the process will be higher, and there is no mention in the prior art of how to use a simple method to realize the process control of this composite parameter
[0006] In addition, grease or other solvents are inevitably used in the preparation process of the film. Although it will be extracted during the process, there may still be a small amount of residue. Whether the grease is extracted cleanly has a great impact on the performance parameters of the film.
If the oil is not extracted, it will directly affect the porosity and air permeability of the separator, and then affect the internal resistance and cycle performance of the battery.
The existing oil content detection method is usually a destructive test, which is not only complicated to operate, but also cannot be applied to the online feedback of the production line, and cannot be directly used to optimize the production process, and can only be used as the test result of the final product

Method used

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  • Film preparation method based on oil content feedback process
  • Film preparation method based on oil content feedback process
  • Film preparation method based on oil content feedback process

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Embodiment Construction

[0041] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042] Diaphragm preparation method

[0043] Raw material A is polyethylene, specifically, it may include the following two parts, and according to a large number of experiments, the preferred weight ratio of the two parts is 1:1.53.

[0044] A1: The molecular weight is 6.5×10 6 -8.5×10 6 polyethylene particles;

[0045] A2: The density is 0.966-0.983g / cm 3 polyethylene particles;

[0046] Raw material B is paraffin oil; raw...

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Abstract

The invention relates to a film preparation method based on an oil content feedback process, which comprises the following steps: mixing and heating polyethylene, paraffin oil, silicon dioxide nanoparticles and 4, 4'-thiobis(6-tert-butyl m-cresol) in batches, carrying out extrusion molding, respectively carrying out transverse stretching and longitudinal stretching, and carrying out two-dimensional stretching; and after stretching is finished, feeding the film into an oil content analysis device, and optimally controlling an oil removal device according to the oil stain distribution conditionon the oil absorption material, so as to finally prepare the lithium battery diaphragm with low oil content.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm and its preparation. Background technique [0002] Separator is an important part of lithium battery, which directly determines the performance and safety of lithium battery. Usually the diaphragm is an insulating material with a porous structure. For the separator, it is usually necessary to ensure a certain porosity and opening size, so that ions can migrate smoothly. If it is too high, the strength of the diaphragm will decrease, and if it is too low, the internal resistance will increase. The uniformity of the membrane also affects the electrolyte wetting the membrane, thereby affecting the internal resistance of the battery. Moreover, under abnormal conditions, too much current will cause the temperature to rise to T1, thereby closing the pores of the membrane, thereby stopping ion migration and avoiding further danger. But if the temperature rises too high to T2, it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052Y02E60/10
Inventor 吕志国瞿荣灿陈宝同王小冬王艳静
Owner 河南银金达新材料股份有限公司
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