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Porous battery diaphragm material and manufacturing method and application of porous battery diaphragm material

A technology of battery diaphragm and font, which is applied in the field of porous battery diaphragm material preparation, can solve the problems of inability to meet the requirements of high-rate alkaline batteries, equipment investment, high comprehensive production cost, poor electrolyte permeability, etc., and achieve excellent chemical stability The effect of ensuring high temperature safety performance, improving safety and cycle performance

Active Publication Date: 2015-06-24
莱州联友金浩新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the manufacturing methods of secondary battery diaphragm materials mainly include phase inversion method, dissolution method, stretching method, fiber dry carding, fiber wet papermaking molding, etc., among which phase inversion method, dissolution method and stretching method are mainly used to manufacture lithium ion Battery diaphragm, this type of battery diaphragm has a two-dimensional structure, poor temperature resistance, large thermal shrinkage, poor safety, low porosity, poor electrolyte permeability and other defects, which have their own defects in ensuring the safety and service life of lithium-ion batteries
Dry carding is mainly used to manufacture alkaline secondary battery separators. This type of battery separator has poor fiber dispersion and uneven distribution, which cannot meet the requirements of power type, high capacity, and high rate alkaline batteries, and may easily cause poor battery consistency. , high short circuit rate and other issues
Wet papermaking technology is used to produce porous battery diaphragm materials. The diaphragm materials produced by this method can meet the application requirements of alkaline batteries, lithium-ion batteries, super capacitors, high-temperature insulating electronic components and high-temperature filtration, but due to material selection and other issues , although wet papermaking technology is currently used to produce porous battery separator materials, most of them use single-net single-layer forming, and then multi-layer compounding, or double-net double-layer forming, which will cause many problems such as equipment investment and comprehensive production costs.

Method used

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  • Porous battery diaphragm material and manufacturing method and application of porous battery diaphragm material
  • Porous battery diaphragm material and manufacturing method and application of porous battery diaphragm material
  • Porous battery diaphragm material and manufacturing method and application of porous battery diaphragm material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) The "rice" type PP / PE bicomponent composite fiber with a fiber diameter of 11 μm was cut into short fibers with a length of 5 mm by a disc fiber cutter.

[0027] (2) The short fiber prepared in the step (1) is subjected to a high-speed rotary cutting beating treatment to prepare a fiber slurry with a concentration of 5%, using water as a dispersion medium, and sodium dodecylsulfonate as a dispersant.

[0028] (3) The fiber slurry prepared in step (2) is subjected to isobaric sizing by a central sizing device, and then passed through a hydraulic inclined-net headbox to form a single-network and double-layer inclined-network.

[0029] (4) After dehydration and pressing, dry in a drying tunnel with hot air at 135°C, and prepare a surface density of 60g / m 2 The porous battery separator material, its structure see figure 1 .

[0030] (5) The prepared porous battery diaphragm material is subjected to sulfur trioxide gas-phase sulfonation treatment to obtain an alkaline ...

Embodiment 2

[0034] (1) The "ten" type PET / PP bicomponent composite fiber and single component polyester fiber with a fiber diameter of 3 μm were cut into short fibers with a length of 5 mm by a disc fiber cutter.

[0035] (2) The short fiber PET / PP composite fiber, polyester fiber and nanocellulose fiber, aluminum oxide fiber prepared by step (1) are uniformly prepared in a mass fraction of 40:35:10:5 with the absolute dry mass of the fiber Mixing, high-speed rotary cutting, beating, and dissolving treatment, to prepare fiber slurry with a concentration of 2%, using water as the dispersion medium, and sodium dodecylbenzenesulfonate as the dispersant.

[0036] (3) The fiber slurry prepared in step (2) is subjected to isobaric sizing by a central sizing device, and then passed through a hydraulic inclined-net headbox to form a single-network and double-layer inclined-network.

[0037] (4) After dehydration and pressing, dry in a drying tunnel with hot air at 170°C, and prepare a surface den...

Embodiment 3

[0042] The specific implementation steps are as follows:

[0043] (1) The "rice" type PET / PP bicomponent composite fiber and single component polyester fiber with a fiber diameter of 3 μm were cut into short fibers with a length of 5 mm by a disc fiber cutter.

[0044] (2) The cut PET / PP composite staple fibers, polyester staple fibers and nanocellulose fibers are uniformly mixed with the absolute dry weight of the fibers at a mass fraction of 10:10:80, and are treated by high-speed rotary cutting beating and dissolving, A fiber slurry with a concentration of 1% is prepared, water is used as a dispersion medium, and sodium dodecylbenzenesulfonate is used as a dispersant.

[0045](3) The fiber slurry prepared in step (2) is subjected to isobaric sizing by a central sizing device, and then passed through a hydraulic inclined-net headbox to form a single-network and double-layer inclined-network.

[0046] (4) After dehydration and pressing, dry in a drying tunnel with hot air at...

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Abstract

The invention relates to a porous battery diaphragm material, and a manufacturing method and an application of the porous battery diaphragm material. The manufacturing method comprises the following steps of (1) cutting a star-shaped or crossed bi-component composite fiber and / or a single-component synthetic fiber with the diameter of 3-15 micrometers into staple fibers which are 2-15mm in length for use with a disc fiber cutter, (2) performing beating and defibering treatment on the cut staple fibers, cellulosic fibers and inorganic fibers to prepare high-concentration fiber stuff, taking water as a dispersing medium and alkane sulfonate as a dispersing agent, (3) performing hydraulic single-net double-layer inclined wire forming with a center spreader, and (4) preparing the porous battery diaphragm material with hot air at 130-220 DEG C after dehydration and squeezing. The material has excellent performance, and can serve as a battery diaphragm, a capacitor diaphragm, a high-temperature insulation membrane and a high-temperature filter material after treatment such as sulphonation treatment, grafting treatment, high-temperature pressing and coating treatment.

Description

technical field [0001] The invention relates to the technical field of preparation of porous battery diaphragm materials, in particular to a porous battery diaphragm material and its manufacturing method and application. Background technique [0002] With the rapid development of the IT electronics industry, new energy vehicles, and energy storage industries, the secondary power supply is showing a vigorous development trend. As one of the key materials of secondary power supply, the battery diaphragm plays an increasingly important role, so the manufacture of battery diaphragm materials has attracted more and more attention. [0003] At present, the manufacturing methods of secondary battery diaphragm materials mainly include phase inversion method, dissolution method, stretching method, fiber dry carding, fiber wet papermaking molding, etc., among which phase inversion method, dissolution method and stretching method are mainly used to manufacture lithium ion Battery diap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B32B3/24H01M50/403H01M50/44H01M50/491
CPCY02E60/10
Inventor 徐继亮方开东钟元徐玉红
Owner 莱州联友金浩新型材料有限公司
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