Gel polymer modified lithium ion battery diagraph and preparing method and application thereof

A gel polymer, lithium-ion battery technology, applied in secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problem of increasing the internal resistance of the battery and reducing the porosity of the coating , poor adhesion between the coating and the substrate, etc., to solve the problem of poor adhesion and good ionic conductivity

Inactive Publication Date: 2015-02-25
乐凯胶片股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, to provide a gel polymer modified lithium-ion battery diaphragm, to solve the problem that the gel polymer coating has poor adhesion to the base material and is easy to peel off from the base material, And the problem that the porosity of the coating decreases due to the swelling of the gel polymer coating in the electrolyte, resulting in an increase in the internal resistance of the battery

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  • Gel polymer modified lithium ion battery diagraph and preparing method and application thereof

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[0040] Preparation method of gel polymer modified lithium-ion battery diaphragm

[0041] The present invention adopts a wet coating method to prepare a gel polymer modified lithium-ion battery diaphragm. The wet coating method is a commonly used method for preparing a microporous membrane or a microporous coating, and no special description is given here.

[0042] The specific preparation steps of the gel polymer modified lithium-ion battery diaphragm of the present invention are:

[0043] (1) Dissolve the gel polymer in solvent Ⅰ, stir and mix evenly to obtain a coating solution, wherein the mass percentage of the gel polymer in the coating solution is 1%~20%, and the flash point of solvent Ⅰ is 50 ℃ or more.

[0044] (2) Coating the coating solution on the surface of the polyolefin microporous membrane to obtain a film A containing a gel polymer coating, wherein the coating amount is 10g / m 2 ~100g / m 2 .

[0045] The method of coating the coating liquid on the surface of ...

Embodiment 1

[0062] (1) Dissolve 200g of P(VDF-HFP) with a molecular weight of 100,000 in 800g of DMF, stir and mix evenly to obtain a coating solution.

[0063] (2) Apply the coating solution on the surface of the PP / PE double-layer film with a thickness of 16 μm by the micro-gravure coating method, and control the coating amount to 10g / m 2 , to obtain film A,

[0064] (3) The film A was immersed in a mixed solvent of water: EG: DMAc of 80:18:2, and stayed for 5 seconds to obtain a film B containing a microporous structure coating.

[0065] (4) Immerse the film B in water, stay for 5 seconds, remove the organic solvent on the surface of the film and in the micropores, and dry at 50°C to obtain a gel polymer modified lithium-ion battery separator.

[0066] Among them, in the gel polymer P(VDF-HFP), the proportion of HFP was 5%. The microscopic morphology of the obtained gel polymer modified lithium-ion battery separator is as follows: figure 1 As shown, it can be seen from the figure th...

Embodiment 2

[0068] (1) Dissolve 10 g of P(VDF-HFP) with a molecular weight of 1,500,000 in 990 g of NMP, stir and mix evenly to obtain a coating solution.

[0069] (2) Apply the coating solution on the surface of the PP / PE / PP three-layer film with a thickness of 20 μm by dip coating, and control the coating amount to 100g / m 2 , to obtain film A,

[0070] (3) The film A was immersed in a mixed solvent of water: DMF: EtOH at a ratio of 50:10:40, and stayed for 15 seconds to obtain a film B containing a microporous structure coating.

[0071] (4) Immerse the film B in water, stay for 15s, remove the organic solvent on the surface of the film and in the micropores, and dry at 80°C to obtain a gel polymer modified lithium-ion battery separator.

[0072] Among them, in the gel polymer P(VDF-HFP), the proportion of HFP was 7%. The microscopic morphology of the obtained gel polymer-modified lithium-ion battery separator is similar to that of the examples, and will not be given here. The thickn...

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Abstract

The invention relates to a gel polymer modified lithium ion battery diagraph and a preparing method and application thereof. The diagraph comprises a microporous polymer layer and at least one layer of gel polymer coating coated with which the microporous polymer layer is coated. The peel strength between the gel polymer coating and the microporous polymer layer in a 180-degree-condition is over 1.0N/cm. The surface and the interior of the gel polymer coating are in reticular porous connecting structures. The porosity of the gel polymer coating is over 40%. A gel polymer is a copolymer of vinylidene fluoride and hexafluoropropylene. According to the invention, the problems that the adhesion between the gel polymer coating and the microporous polymer layer is poor and the gel polymer coating is easy to strip from the polymer microporous layer are solved, and the problem that the gel polymer coating swells in electrolyte as to enable the coating porosity to be reduced, and further the battery internal resistance is increased is solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a gel polymer modified lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] With the development of microelectronics technology, miniaturized equipment is increasing day by day, which puts forward high requirements on power supply. Lithium-ion batteries have beneficial properties such as high working voltage, high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect. They have been widely used in many fields, such as mobile phones, handheld computers, notebook computers, Power tools, electric vehicles, street lamp backup power, navigation lights, video cameras, cameras, small household appliances. Among them, the gel polymer lithium-ion battery has shown a strong development momentum, and its use is not limited to portable electronic products, electric vehicles and other fields, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M10/0525H01M50/403H01M50/411H01M50/491
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/463Y02E60/10
Inventor 赵义丽王亚东高甲赵伟建刘国鑫千昌富
Owner 乐凯胶片股份有限公司
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