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Surface modification treatment method of battery diaphragm

A battery diaphragm and surface modification technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of insufficient hydrophilicity and heat resistance of the diaphragm, high stress and pore blockage, and low coating stress. Achieve the effect of improving hydrophilicity and heat resistance, reducing internal stress and reducing brittleness

Inactive Publication Date: 2016-06-29
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of insufficient hydrophilicity and heat resistance of polyolefin battery separators and the problems of high stress and pore blockage caused by the deposition of inorganic oxide coatings on the surface, the invention provides an organic monomer ionization-doped inorganic oxide coating A method for surface modification of the battery separator, the battery separator treated by this method has both hydrophilicity, heat resistance, low coating stress, and can maintain a high porosity

Method used

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  • Surface modification treatment method of battery diaphragm

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Experimental program
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Effect test

Embodiment 1

[0031]The surface modification of a commercially available polyolefin battery separator was carried out using an ion-assisted electron beam evaporation coating device equipped with an e-type electron gun evaporation coating system and a Hall ion source system. In order to monitor the thickness and deposition rate of the coating, the ion-assisted electron beam evaporation coating device is equipped with a crystal oscillator film thickness monitor. In this embodiment, silicon dioxide particles with a purity of not less than 99.99% are used as the raw material for the inorganic oxide coating, argon with a purity of not less than 99.99% is used as the discharge gas, and hexamethyl di Siloxane as an organic monomer specifically comprises the following steps:

[0032] In the step where the inorganic oxide raw material is heated, evaporated and deposited on the surface of the battery separator to form an oxide coating:

[0033] ①Put the battery diaphragm 3 and silicon dioxide respec...

Embodiment 2

[0047] The surface modification treatment method of the battery separator in this example is basically the same as the treatment steps in Example 1, the only difference is that the raw material of the inorganic oxide is aluminum oxide, and the siloxane organic monomer is octamethylcyclotetrafluoroethylene silicone.

[0048] Since the evaporation and gasification stability of aluminum oxide is better than that of silicon dioxide, and it is not easy to lose oxygen due to heat, a higher deposition rate than silicon oxide can be used. However, the hardness of the aluminum oxide coating is higher than that of the silicon oxide coating, so the total thickness of the aluminum oxide coating should not exceed 120nm.

[0049] The intake flow rate of octamethylcyclotetrasiloxane is lower than that of hexamethyldisiloxane, and the ionization voltage of the ion source should be increased to ensure a better ionization effect.

Embodiment 3

[0051] The surface modification treatment method of the battery diaphragm in this example is basically the same as the treatment steps in Example 1, the only difference being that silicon monoxide and zirconia are used as raw materials for inorganic oxides, and the ion source 4 is a Kaufmann ion source.

[0052] Because silicon monoxide and zirconium dioxide are used at the same time, the evaporation and gasification stability of the inorganic oxide raw materials is better than that of Example 1, and it is not easy to lose oxygen due to heat, and a higher deposition rate is adopted, but the hardness of the two coatings is lower than that of Example 1. It is higher than Example 1.

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Abstract

The invention belongs to material surface modification treatment technology, in particular to a method for performing surface modification treatment on battery separators. The principle is that in the ion-assisted electron beam evaporation coating device, the inorganic oxide raw materials are heated and evaporated, deposited on the surface of the battery separator to form an oxide coating, and the siloxane organic monomer is ionized and activated by the ion source and doped into the inorganic oxide coating. The hydrophilicity and heat resistance of the polyolefin separator are improved due to the introduction of the inorganic oxide coating. Moreover, due to the ionization doping effect of the siloxane organic monomer, the internal stress and barrier properties of the inorganic oxide coating are significantly reduced, so that the polyolefin separator can better maintain the original flexibility and porosity. Therefore, the hydrophilicity and heat resistance of the polyolefin battery separator are improved, and good flexibility and porosity are maintained.

Description

technical field [0001] The invention relates to a material surface modification treatment technology, in particular to a surface modification treatment method of a battery diaphragm. Background technique [0002] Separator materials are used in many battery chemistries, especially lithium-ion batteries. The battery separator is one of the four key materials of lithium-ion batteries (positive electrode, negative electrode, separator, electrolyte), and is a very critical part of the battery, which has a direct impact on battery safety and cost. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle capacity and safety of the battery, especially for the safety of lithium batteries. [0003] At present, commercial lithium-ion battery separators are mainly porous polyolefin materials that have undergone precise biaxial stretching, such as: polyethylene (PE), polypropylene (PP), polyet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16C23C14/30C23C14/10C23C14/08H01M50/403
CPCH01M50/403Y02E60/10
Inventor 王正铎陈强朱惠钦原建松曹庆波
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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