A film without oil residue and its preparation method
A grease and film technology, applied in the field of lithium battery separator and its preparation, can solve the problems of unawareness of consistent battery safety and performance improvement, affecting the porosity and air permeability of the separator, and difficult to control multi-parameter crossover, so as to improve safety. and electrical properties, high oil removal efficiency, and the effect of ensuring the consistency of the diaphragm
Active Publication Date: 2020-12-22
河南银金达新材料股份有限公司
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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, grease or other solvents are inevitably used in the preparation process of the film. Although it will be extracted in the process, there may still be a small amount of residue. Whether the grease is extracted or not 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.
According to the existing technology, if you want to further remove the residual oil, you can only extract it multiple times, which will prolong the extraction time, increase the cost, and more seriously, increase the complexity of the process, so that additional reprocessing is required on the conventional production line. Set up the extraction box
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[0039] 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.
[0040] Diaphragm preparation method
[0041] 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.
[0042] A1: The molecular weight is 6.5×10 6 -8.5×10 6 polyethylene particles;
[0043] A2: The density is 0.966-0.983g / cm 3 polyethylene particles;
[0044] Raw material B is paraffin oil; raw...
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Abstract
A film without grease residue and a preparation method thereof, comprising mixing and heating polyethylene, paraffin oil, silica nanoparticles, and 4,4'-thiobis(6-tert-butyl-m-cresol) in batches, and Extrusion molding, after transverse stretching and longitudinal stretching, and then two-dimensional stretching. After the stretching is completed, the film is sent to the degreasing device, and the degreasing operation is performed on the film under the action of the squeeze roller and the oil-absorbing material, thereby preparing a lithium battery separator without grease residue.
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...
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IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052Y02E60/10
Inventor 瞿荣灿王果连董冲夏国华李海良
Owner 河南银金达新材料股份有限公司