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Coating method of battery diaphragm

A battery diaphragm and coating technology, which is applied in the field of battery diaphragm coating, can solve problems such as complex process, poor bonding effect of pole pieces, and poor air permeability of the diaphragm, and achieve simple operation, good air permeability, and reduced impact Effect

Inactive Publication Date: 2020-01-17
深圳市劢全新材料科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a method for coating a battery diaphragm, which is used to solve the problems of complex process, poor gas permeability of the diaphragm and poor bonding effect of the pole piece in the prior art. technical flaw

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Embodiment Construction

[0025] The present invention provides a coating method for a battery diaphragm, which is used to solve the technical defects in the prior art that the PVDF diaphragm coating method has complex processes, poor diaphragm permeability and poor bonding effect of pole pieces.

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] In order to describe the present invention in more detail, a method for coating a battery separator provided by the present invention will be specifically described below in conjunction with examples.

[0028] The present invention provides a method for ...

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Abstract

The invention belongs to the technical field of battery preparation, and particularly relates to a coating method of a battery diaphragm. The coating method of the battery diaphragm is characterized by spraying / printing, and removing a solvent; fully dissolving a PVDF material in the slurry, and coating the PVDF material on the surface of the diaphragm to be coated in a spraying / printing mode, sothat the coating operation is simple, and the substances, such as a pore-forming agent, a thickening agent, etc., do not need to be added into the slurry. Compared with a traditional modified layer coating mode, an oil system is coated on the surface of the diaphragm to form the modified layer composed of a plurality of small disc-shaped materials, the small gaps are reserved between the gaps of the sheet-shaped coatings and between the sheet-shaped coatings, the air permeability of the diaphragm is good, and the resistance of the ions when the ions are migrated on an interface can be effectively reduced, so that the improvement of the conductivity is facilitated, the influence of the modified layer on the charging and discharging performance of a battery is reduced, the comprehensive performance of the diaphragm is remarkably improved, and the technical defects that in the prior art, a PVDF membrane coating method is complex in process, poor in membrane air permeability and poor in pole piece bonding effect, are solved.

Description

Technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a method for coating a battery diaphragm. Background technique [0002] The diaphragm is a thin film used to separate the positive and negative poles during the electrolysis reaction to prevent the direct reaction in the electrolytic cell from losing energy. In the structure of lithium batteries, the diaphragm is one of the key internal components; the performance of the diaphragm determines the interface structure and internal resistance of the battery, and directly affects the battery’s capacity, cycle and safety performance. The excellent performance of the diaphragm can improve the battery The comprehensive performance plays an important role. [0003] PVDF is divided into oily system and water-based system. In the prior art, the PVDF membrane coating method is mostly water-based PVDF slurry coating. Water-based PVDF mainly blends PVDF powder into water to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 刘桥陈志明敬素君
Owner 深圳市劢全新材料科技有限责任公司
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