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Method for preparing lithium battery diaphragm from PE-PP orange flake type composite spun ultrafine fiber

A lithium battery separator, PE-PP technology, applied in the direction of fiber type, fiber treatment, textile and paper making, etc., can solve the problems of unenvironmental protection and pollution, and achieve the effect of large porosity, high safety and stable pore size

Active Publication Date: 2019-12-13
GUANGDONG MODERN HIGH TECH FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, COPET accounts for 40-45wt% of the composite fine denier POY fiber. After warping and hot pressing, COPET needs to be dissolved with a large amount of alkali, which pollutes the environment and is not environmentally friendly.

Method used

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  • Method for preparing lithium battery diaphragm from PE-PP orange flake type composite spun ultrafine fiber
  • Method for preparing lithium battery diaphragm from PE-PP orange flake type composite spun ultrafine fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for manufacturing lithium battery diaphragms from PE-PP orange segment composite spinning ultrafine denier fibers

[0026] 1. This embodiment is realized by the requirements of the following equipment

[0027] (1) Two screws: aspect ratio ≥ 32:1, compression ratio ≥ 3.4: 1;

[0028] (2) Two sets of drying systems: drying effect ≤ 100ppm;

[0029] (3) A set of composite spinning box;

[0030] (4) Orange petal-shaped components: the spinneret has 48 holes and 32 petals;

[0031] (5) Side blowing oiling device and winding forming device;

[0032] (6) Weaving equipment;

[0033] (7) Two-way stretching and heat setting equipment.

[0034] 2. This embodiment requires raw and auxiliary materials

[0035] (1) Fusion refers to PP raw materials with MFR ≥ 30;

[0036] (2) Fusion refers to PE raw materials with MFR ≥ 25;

[0037] (3) Spinning oil containing silicone oil.

[0038] 3. Conditions to be controlled in this embodiment

[0039] (1) The drying temperatu...

Embodiment 2

[0059] Using 80D / 48F 32 petals as the warp and 50D / 48F32 petals as the weft ultra-fine denier to manufacture lithium battery separators

[0060] 1. Preparation of POY superfine denier fiber of 80D / 48F 32 petals

[0061] (1) Production process: PE and PP are dried at a temperature of 65-70°C respectively, and the equipment is dried for 2-3 hours, respectively put into PE and PP screw extruders to melt evenly, and measured by metering pumps (50% each) , sent to the composite assembly in the composite spinning box for composite spinning, cooled by side blowing, oiled, and wound at a spinning speed of 3000m / min to obtain ultra-fine denier segmented fibers, such as figure 2 shown.

[0062] (2) Process control:

[0063] PE screw temperature 260-270°C, screw pressure 8.5MPa;

[0064] PP screw temperature 260-280°C, screw pressure 8.5MPa;

[0065] Spinning box temperature 260-270°C, component pressure 7.5MPa;

[0066] The air temperature of side blowing is 18°C, the wind speed i...

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Abstract

The invention relates to a method for preparing a lithium battery diaphragm from PE-PP orange flake type composite spun ultrafine fiber. The method includes the steps that (1) PE is dried and put intoa screw extruder for melting and feeding, and then enters a metering pump for metering; (2) PP is dried and put into the screw extruder for melting and feeding, and then enters the metering pump formetering; (3) PE and PP in a composite spinning box are subjected to composite spinning, and lateral blowing cooling, oiling and winding forming are performed to obtain the orange flake type ultrafinefiber; (4) weaving is performed to obtain diaphragm cloth; (5) two-way stretching and setting are performed to obtain a shaped lithium battery diaphragm, wherein the heat setting temperature is 80-120 DEG C; (6) double-sided coating with ceramic powder is performed to obtain the lithium battery diaphragm which is high in strength, large in porosity, stable in pore diameter, good in wettability, good in thermal dimension stability, good in thermal closure performance and higher in safety. Due to the PE-PP alternate structure, when the temperature of a lithium battery rises, PE melts, the closure effect is good, the safety is higher, and the porosity reaches 40-50% under the condition of high strength; besides, alkali liquor for dissolution is not needed, and thus higher environmental friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a method for manufacturing lithium-ion battery diaphragms from PE-PP orange petal-shaped composite spinning ultrafine denier fibers. Background technique [0002] With the development of the new energy industry, the importance of lithium batteries has gradually become prominent. Lithium metal anode material is considered as an ideal anode material for rechargeable batteries due to its extremely high mass specific capacity, low density and low reduction potential. Lithium batteries have high storage energy density, low self-discharge rate, long service life, strong adaptability, and long standby time, but they are high in cost, poor in safety performance, and have the risk of explosion. The lithium battery separator is one of the most important components in the lithium battery, and the preparation of a safe, environmentally friendly, and low-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D03D15/00D03D1/00D06C3/00D06C7/02H01M2/14H01M2/16D01F8/06D06M11/00D06M101/20H01M50/403H01M50/414H01M50/434H01M50/44H01M50/451H01M50/457
CPCD03D1/0088D06C3/00D06C7/02D01F8/06D06M11/00D10B2321/021D10B2321/022D06M2101/20D03D15/33H01M50/44H01M50/403Y02E60/10
Inventor 郭清海江建平陈光明余景升郭人琦黄少红柯伟斌
Owner GUANGDONG MODERN HIGH TECH FIBER CO LTD
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