Preparation method and application of long-durability polyolefin-coated diaphragm

A polyolefin diaphragm and coating technology, which is applied in the direction of coating, electrical components, electrochemical generators, etc., can solve the problems of high moisture content, unfavorable ceramic base film, etc.

Pending Publication Date: 2021-05-28
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems are: (1) The ceramic coating is mainly composed of inorganic particles, such as alumina ceramics and boehmite ceramics, which will cause a large mass of the coated diaphragm per unit area (area density), which is not conducive to reducing the battery life. quality; (2) The ceramic coating layer is relatively easy to absorb moisture, which will cause the ceramic moisture content to be relatively high. Large, and the ceramic diaphragm needs to be sealed and washed into other dry substances during transportation, and the packaging cost is high; (3) The coating used for

Method used

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  • Preparation method and application of long-durability polyolefin-coated diaphragm

Examples

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Embodiment 1

[0039] Cross-linking preparation method of cross-linked polyvinyl siloxane in the present embodiment: (1) In twin-screw extrusion with aspect ratio of 30, polyethylene (100 parts), initiator dicumyl peroxide (0.1 parts) ), siloxane grafting agent methacryloxypropyltrimethoxysilane (0.3 part), catalyst dilaurin dimethyl tin (0.5 part) metering hopper After adding the corresponding materials into the extruder, crosslink The temperature is 160°C; (2) Extrude cross-linked polyethylene through an extruder, the casting temperature is 220°C, and the cooling roll temperature is 40°C; (3) After cooling in a cooling water tank, a cooling fan, and finally pelletizing, the obtained The cross-linked polyethylene particles used for coating had a gel content of 45.4%.

[0040] Long-lasting slurry formula in the embodiment of the present invention: in this long-lasting slurry formula, each component is composed by weight percentage, and the total is 100 parts, (1) cross-linked polyethylene pa...

Embodiment 2

[0042] Preparation of cross-linked polyethylene diaphragm particles: (1) Polyethylene powder with a weight-average molecular weight of 80kg / mol is irradiated with high-energy rays at room temperature, with an irradiation intensity of 50Gy / min and a total dose of 155Gy. (2) Place the irradiated polyethylene powder in an oven at 85°C for 2 hours; (3) Stand the polyethylene powder at room temperature for 4 hours to obtain cross-linking Polyethylene powder with a gel content of 55.6%.

[0043] In the embodiment of the present invention, the long-durable slurry formula includes 40 parts of cross-linked polyethylene particles and alumina, and cross-linked polyethylene: alumina ceramics = 65:35. 3 parts of binder acrylonitrile and acrylic acid multiple copolymer, others are consistent with embodiment 1.

Embodiment 3

[0045] Preparation of cross-linked polyethylene particles: the total amount of irradiation is 200kGy, and the gel content of cross-linked polyethylene is 65.9%. Others are consistent with Example 1.

[0046] The long-lasting slurry formula in this example: 40 parts of cross-linked polyethylene particles and alumina, cross-linked polyethylene:ceramic=75:25. Others are consistent with Example 2.

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Abstract

The invention provides a preparation method and application of a long-durability polyolefin-coated diaphragm. According to the invention, a layer of crosslinked polyethylene and ceramic mixture coats on one side or two sides of a base diaphragm, and the crosslinked polyethylene is prepared by irradiation crosslinking or siloxane crosslinking. The crosslinked polyethylene coating the surface of the base diaphragm can greatly improve the electrolyte-resistant size stability of the diaphragm, decrease the moisture content of the diaphragm, reduce the risk that the diaphragm is stabbed under pressurization, and enhance the quality and electrochemical stability of the coated diaphragm, so the long-durability battery diaphragm has better electrolyte aging resistance and is more beneficial for improving the high-temperature cycle performance, the high-temperature storage performance and the like of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation method and application of a long-durable coated polyolefin diaphragm for a high-energy-density lithium-ion battery diaphragm. Background technique [0002] The development of power batteries determines the future of new energy vehicles, and the improvement of the energy density of power batteries largely determines the development of power batteries. Due to the consideration of cruising range, the new energy automobile industry has more and more urgent requirements for high energy density batteries to enter the stage of practical application. As power batteries have higher and higher requirements for long battery life and high energy density, the requirements for safety performance are also getting higher and higher. As one of the four main materials of the battery, the battery separator needs to have a certain pore size (about 100nm) and porosity (...

Claims

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Application Information

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IPC IPC(8): H01M50/446H01M50/417H01M50/451H01M50/403H01M10/0525C08J7/04C09D123/06C09D7/61C08L23/06C08L23/12
CPCH01M10/0525C08J7/0427C09D123/06C09D7/61C08J2323/06C08J2323/12C08J2423/06C08K2003/2227C08K3/22Y02E60/10
Inventor 吕飞申津婧高秀玲王驰伟
Owner TIANJIN ENERGIES
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