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Porous membrane and preparation method thereof

A technology of porous membrane and porous thin film, applied in the field of porous membrane and its manufacturing, can solve the problems of high cost, unfavorable mass production, complex process, etc., achieve low cost, improve safety performance, high current and high rate charge and discharge performance, The effect of simplifying the separation and recovery process

Inactive Publication Date: 2012-05-23
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires cooling the gel, removing the solvent, and two stretching processes. The process is relatively complicated and the cost is high, which is not conducive to large-scale production.

Method used

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  • Porous membrane and preparation method thereof
  • Porous membrane and preparation method thereof
  • Porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Mix 10kg of polyvinylidene fluoride (PVDF) material and 20kg of N-methylpyrrolidone (NMP) solvent, disperse in a twin-screw machine at a controlled temperature of 90°C, extrude through a die head through a melt pump, and condense in water. Glue forms a thin film. Next, the above-mentioned film is drawn into an extraction tank, and the solvent is extracted with water, thereby forming a film with a porous structure. Finally, the above-mentioned porous film was dried with hot air, and then cut into widths of 125 mm and thicknesses of 22 μm, and the winding was completed after static electricity was removed. The measured air permeability is 150 seconds / 100CC.

Embodiment 2

[0051] Mix 10kg of polysulfone (PS) material, 25kg of N-methylpyrrolidone (NMP) solvent, and 0.3kg of lithium chloride (LiCl), disperse it in a twin-screw machine at a controlled temperature of 100°C, and pass it through a melt pump. Head extruded, into the water gel to form a film. Next, the above-mentioned film is pulled into an extraction tank, and the solvent and inorganic salt are extracted with water, thereby forming a film with a porous structure. Finally, the above-mentioned porous film was dried with hot air, and then cut into widths of 125 mm and thicknesses of 30 μm, and the winding was completed after static electricity was removed. The measured air permeability is 120 seconds / 100CC.

Embodiment 3

[0053] Mix 10kg of polyvinylidene fluoride (PVDF) material and 30kg of triethyl phosphate (TEP) solvent, disperse in a twin-screw machine at a controlled temperature of 90°C, extrude through a die head through a melt pump, and gel in water Form a thin film. Next, the above-mentioned film is drawn into an extraction tank, and the solvent is extracted with water, thereby forming a film with a porous structure. Finally, the above-mentioned porous film was dried with hot air, and then cut into widths of 125 mm and thicknesses of 22 μm, and the winding was completed after static electricity was removed. The measured air permeability is 150 seconds / 100CC.

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Abstract

The invention provides a preparation method of a porous membrane, comprising the following steps: mixing and dispersing a polymer and solvent to prepare slurry; enabling the slurry to flow out of a narrow break joint to form a membrane in a gel tank; introducing the membrane to an extraction tank to carry out solvent replacement to form the porous membrane; and drying the porous membrane. The preparation method is simple in process, precise in control, low in cost and high process safety. The porous membrane prepared by using the preparation method can be widely applied to primary batteries, secondary batteries, electrochemical containers and the like.

Description

technical field [0001] The present invention relates to a porous film and its manufacturing method. Background technique [0002] Porous film usually refers to a film with a certain porosity per unit area. [0003] Porous membranes are mostly prepared by solvent-induced phase inversion (DIPS) or thermally induced phase separation (TIPS). The non-solvent-induced phase inversion method was developed earlier, the technology is relatively mature, and the method is relatively simple, but the obtained membrane has poor mechanical strength and low porosity. The thermally induced phase separation method uses crystalline and thermoplastic polymers and high-boiling point, low-molecular-weight diluents to form a homogeneous casting film at high temperatures. When the temperature decreases, solid-liquid or liquid-liquid phase separation occurs, and then the diluent is removed. , to obtain a polymer microporous membrane. The TIPS method is relatively complicated, and often requires po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08L27/12C08L27/16C08L33/12C08L33/20C08L71/00C08L81/06C08L27/06H01M2/18H01M2/16H01M50/403H01M50/414H01M50/426H01M50/489H01M50/491
CPCY02E60/12H01M2/14B01D67/0009H01M2/145H01M2/1653Y02E60/10H01M50/403H01M50/491H01M50/414H01M50/489H01M50/426
Inventor 李翔孙庆津唐杰
Owner MICROVAST POWER SYST CO LTD
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