A kind of polyethylene film without coating debris and its preparation method

A polyethylene film, no coating technology, applied in the direction of coating, metal material coating process, instruments, etc., can solve problems such as hindering the application of coating friction detection technology, changes in film mechanical and electrical properties, and inability to accurately simulate, etc. Achieve the effect of ensuring safety, avoiding rupture and improving safety

Active Publication Date: 2021-01-08
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

In summary, none of the existing technologies can accurately simulate the real situation
[0005] Moreover, the method of simply performing friction detection in the prior art will cause the rubbed coating fragments to be adsorbed on the film due to static electricity.
On the one hand, these fragments will lead to changes in the mechanical and electrical properties of the film, especially easy to cause high temperature and high current perforation; on the other hand, some sharp fragments may even puncture the film and cause battery damage
This also hinders the application of coating friction detection technology in the actual production line, but can only be applied to the follow-up sample experimental detection link

Method used

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  • A kind of polyethylene film without coating debris and its preparation method
  • A kind of polyethylene film without coating debris and its preparation method
  • A kind of polyethylene film without coating debris and its preparation method

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Embodiment Construction

[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. Optionally, it can also be 1:1.61.

[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]...

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Abstract

The invention discloses a preparation method of a polyethylene film without coating fragments. The preparation method comprises the following steps: preparing a polyethylene film; carrying out two-dimensional stretching after carrying out conventional stretching; coating the film with a first coating, sputtering the film with a second coating, and cleaning residual coating fragments by using multiple processes after coating shedding inspection, thereby ensuring that no coating fragment remains on the film, and enhancing the safety of a lithium battery film.

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. During the use of lithium batteries, lithium dendrites will inevitably be generated, and they will continue to grow and pierce the separator, causing safety accidents. In the prior art, ceramic coatings are used to prevent the growth of lithium dendrites and puncture the diaphragm, but the reaction between Si element in the ceramic and metal lithium leads to excessive loss of effective lithium in the battery, thereby affecting the electrical performance of the lithium battery. [0003] In addition, the protection of the membrane by the coating is more theoretically realized, and the falling fragments of the coating will pierce the mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08J5/18C09D127/16C09D7/61C09D7/65C08L23/06C08L91/06C08K5/375C23C14/20C23C14/35H01M50/417G01N19/04
CPCC08J5/18C08J2323/06C08J2427/16C08L23/06C09D127/16C23C14/205C23C14/35C09D7/61C09D7/65C08J7/0427G01N19/04C08L33/02C08K3/36C08L91/06C08K5/375
Inventor 李国庆李航樊鹏鹏蔡文彬仲宁宁
Owner 河南银金达新材料股份有限公司
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