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Chemically-modified lithium battery diaphragm and preparation method thereof

A lithium battery diaphragm and chemical modification technology, which is applied in the direction of secondary batteries, electrochemical generators, battery components, etc., can solve the problems of diaphragm performance damage, coating layer peeling, and affecting the quality of lithium batteries, etc., to reduce Thermal shrinkage, easy operation, and improved cycle performance

Inactive Publication Date: 2019-05-03
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional PE polyolefin separator used in lithium-ion batteries has been difficult to meet the performance requirements of high safety, fast charging, high energy density, and high cycle performance. In order to improve its thermal stability, reduce thermal shrinkage, and improve the wettability of the electrolyte Inorganic oxides are often coated on the surface of the lithium-ion separator, but the current coating method is physical adsorption, that is, the inorganic oxide particles are coated on the surface of the base membrane using a hydrophilic polymer as a binder. There are certain defects in this method. The coating layer is easy to fall off from the surface of the base film, which will easily lead to damage to the performance of the separator and further affect the quality of the lithium battery.

Method used

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  • Chemically-modified lithium battery diaphragm and preparation method thereof
  • Chemically-modified lithium battery diaphragm and preparation method thereof
  • Chemically-modified lithium battery diaphragm and preparation method thereof

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preparation example Construction

[0024] The present invention provides a method for preparing a chemically modified lithium battery separator, which includes the following steps:

[0025] Perform activation treatment on the surface of the PE film to form C=O groups on the surface of the PE film; preferably, the activation treatment is to dip the PE film with an activation solution; preferably, the activation solution is an aqueous solution of hydrogen peroxide and nitric acid Mixture; More preferably, the activation solution is hydrogen peroxide and 60-75% by mass nitric acid mixed in a volume ratio of 4-6:1; further preferably, the temperature of the activation treatment is 25-40°C, and the activation treatment The time is 0.5-2h; more preferably, after the surface of the PE film is activated, the activated PE film is washed and dried. Still further preferably, the activated PE film is washed with pure water and then dried.

[0026] A silica film is formed on the surface of the activated PE film; preferably, the...

Embodiment 1

[0032] The embodiment of the present invention provides a chemically modified lithium battery separator, which is prepared by using the following steps:

[0033] S11. Perform activation treatment on the surface of the PE film to form C=O groups on the surface of the PE film; specifically, use an activation solution for the immersion treatment on the PE film. The activation solution is hydrogen peroxide and 65% by mass nitric acid. : The volume ratio of 1 is mixed uniformly, the temperature of the activation treatment is 35℃, and the time of the activation treatment is 1h; the activated PE film is washed with pure water and then put into the oven and baked at 60℃ for 2min to dry.

[0034] S12. A silicon dioxide film is formed on the surface of the activated PE film; the activated PE film is immersed in a modification solution, which is obtained by dissolving tetraethoxysilane and ammonium hydroxide in ethanol. The concentration of tetraethoxysilane is 3g / L, the concentration of ammo...

Embodiment 2

[0036] The embodiment of the present invention provides a chemically modified lithium battery separator, which is prepared by using the following steps:

[0037] S21. Perform activation treatment on the surface of the PE film to form C=O groups on the surface of the PE film; specifically, use an activation solution to coat the PE film, the activation solution is hydrogen peroxide and 70% nitric acid by mass The volume ratio of 6:1 is mixed uniformly, the temperature of the activation treatment is 30°C, and the time of the activation treatment is 2h; the activated PE film is washed with pure water and then put into the oven and baked at 60°C for 3min to dry.

[0038] S22. A silicon dioxide film is formed on the surface of the activated PE film; the activated PE film is immersed in a modification solution, which is obtained by dissolving tetraethoxysilane and ammonium hydroxide in propanol, in the modification solution The concentration of tetraethoxysilane is 2g / L, the concentration...

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Abstract

The invention discloses a chemically-modified lithium battery diaphragm and a preparation method thereof, and belongs to the field of lithium batteries. The preparation method of the chemically-modified lithium battery diaphragm comprises the following steps: activating the surface of a PE film to form a C = O group on the surface of the PE film; and forming a silicon dioxide film on the surface of the activated PE film. The preparation method is simple in process, convenient to operate and suitable for large-scale production. In addition, the invention also relates to the lithium battery diaphragm prepared by the preparation method. The chemically-modified lithium battery diaphragm solves the problem that the coating of the diaphragm is easy to fall off, the thermal shrinkage rate of thediaphragm is reduced, and the cycle performance is improved.

Description

Technical field [0001] The invention relates to the field of lithium batteries, and in particular to a chemically modified lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic products and new energy vehicles. With the rapid development of electronic products and new energy vehicles, the performance requirements for supporting materials for lithium-ion batteries are becoming higher and higher. The traditional PE polyolefin separator used in lithium ion batteries has been difficult to meet the performance requirements of high safety, fast charging, high energy density, high cycleability, etc. In order to improve its thermal stability, reduce thermal shrinkage, and improve electrolyte wettability Inorganic oxide is often coated on the surface of the lithium ion membrane, but the current coating method is physical adsorption, that is, the inorganic oxide particles are coated on the surface of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/431H01M50/489
CPCY02E60/10
Inventor 徐锋袁海朝孟欣欣苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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