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A uniformly distributed film and its two-dimensional stretching preparation method

A technology with evenly distributed and stretched areas, applied in secondary battery repair/maintenance, secondary batteries, structural parts, etc., can solve problems such as precise adjustment of film uniformity, film safety and electrical performance limitations, and achieve accuracy and consistency sexual effect

Active Publication Date: 2020-12-22
河南银金达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the uniformity of various parameters of the film cannot be precisely adjusted during the stretching stage, thus limiting the space for further improvement of the film's safety and electrical properties.

Method used

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  • A uniformly distributed film and its two-dimensional stretching preparation method
  • A uniformly distributed film and its two-dimensional stretching preparation method
  • A uniformly distributed film and its two-dimensional stretching preparation method

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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

A uniformly distributed film and its two-dimensional stretching preparation method, comprising mixing polyethylene, paraffin oil, silica nanoparticles, 4,4'-thiobis(6-tert-butyl-m-cresol) in batches Heating and extruding into shape, after transverse stretching and longitudinal stretching respectively, and then according to the abnormal light transmittance of the film to determine the further stretching control area, according to the area to be stretched, control the two-dimensional stretching device to carry out precise two-dimensional Stretched and then dried into rolls. Thus, a lithium battery separator with better safety and electrical performance can be obtained.

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, and its common type is polyethylene film. The performance of the separator directly determines the performance and safety of the 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 avo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/42H01M10/052
CPCH01M10/052H01M10/4235Y02E60/10
Inventor 张启纲王果连李海良吴齐王威威
Owner 河南银金达新材料股份有限公司
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