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Polyaromatic ester fiber-based battery diaphragm as well as preparation method and application thereof

A technology of polyarylate fiber and battery diaphragm, which is applied in the direction of pulp beating method, fiber dispersant addition, synthetic cellulose fiber, etc., which can solve the impact of lithium ion battery safety, poor heat resistance and chemical resistance, and restrict the development of the industry, etc. problem, to achieve the effect of excellent physical and mechanical properties

Inactive Publication Date: 2018-02-23
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor heat and chemical resistance and low mechanical strength of polyolefin materials, it has a certain impact on the safety of lithium-ion batteries, which also restricts the development of related industries to a certain extent.

Method used

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  • Polyaromatic ester fiber-based battery diaphragm as well as preparation method and application thereof
  • Polyaromatic ester fiber-based battery diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw materials are weighed according to the following mass fraction proportions: polyarylate fiber pulp 20%, polyarylate staple fiber 80%.

[0039] Prepare 20wt% polyarylate fiber pulp aqueous solution, soak for 12h, then ultrasonically disperse for 2h, and then beat through a tank beater with a beating load of 2.5kg and a beating degree of 70°SR. Dilute the aqueous solution of arylate fiber pulp to a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, and add it to the deflaker for dispersion. a.

[0040] Dilute the polyarylate staple fiber with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.8wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fiber evenly with a decomposer In deionized water, the speed of the disintegrator is 5000r / min, and vigorously stirred for 30min to obtain slurry B.

[0041]Mix the two kinds of slurr...

Embodiment 2

[0043] Raw materials were weighed according to the following mass fractions: 20% polyarylate fiber pulp, 70% polyarylate short fiber, and 10% polyarylate long fiber.

[0044] Prepare 20wt% polyarylate fiber pulp aqueous solution, soak for 12h, then ultrasonically disperse for 2h, and then beat through a tank beater with a beating load of 2.5kg and a beating degree of 70°SR. Dilute the aqueous solution of arylate fiber pulp to a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, and add it to the deflaker for dispersion. a.

[0045] Dilute the polyarylate staple fibers with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.7wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fibers evenly with a decomposer In deionized water, the speed of the disintegrator is 5000r / min, and vigorously stirred for 30min to obtain slurry B.

[0046] Di...

Embodiment 3

[0049] Raw materials are weighed according to the following mass fractions: polyarylate fiber pulp 30%, polyarylate staple fiber 70%.

[0050] Prepare 30wt% polyarylate fiber pulp aqueous solution, soak for 12h, then ultrasonically disperse for 2h, and then beat through a tank beater with a beating load of 2.5kg and a beating degree of 50°SR. Dilute the aqueous solution of arylate fiber pulp to a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, and add it to the deflaker for dispersion. a.

[0051] Dilute the polyarylate staple fibers with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.7wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fibers evenly with a decomposer In deionized water, the speed of the disintegrator is 5000r / min, and vigorously stirred for 30min to obtain slurry B.

[0052] Mix the two kinds of slurries A an...

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Abstract

The invention discloses a polyaromatic ester fiber-based battery diaphragm as well as a preparation method and application thereof. The thickness of the polyaromatic ester fiber-based battery diaphragm is 70-80mu m, the Gurley value of the battery diaphragm is 54-67S / 100cc, the porosity of the battery diaphragm is 60-70%, the ionic conductivity of the battery diaphragm is 0.89-1.1*10<3>S / cm, the size shrinkage rate of the battery diaphragm, treated for 2h at the temperature of 260 DEG C, is less than 0.5%, the tensile strength of the battery diaphragm is 24.6-30.1MPa, and the elongation at break of the battery diaphragm is 7.5-8.3%. The battery diaphragm is prepared by taking a paper-making process as reference and adopting polyaromatic ester fibers; the problems of fiber separation, dispersion and the like, which are caused in a process of preparing the polyaromatic ester fiber-based battery diaphragm by using the paper-making process, can be solved by means of formula adjustment andtechnology improvement, so that the polyaromatic ester fiber-based battery diaphragm is successfully prepared; the polyaromatic ester fiber-based battery diaphragm has the advantages of being safe, efficient and stable.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a polyarylate fiber-based battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in digital products, electric tools, electric vehicles and other fields because of their advantages such as high cell voltage, high specific energy and small self-discharge. [0003] The separator of a lithium-ion battery is very important in a lithium-ion battery. At present, most of the separators of commercial lithium-ion batteries are made of PP or PE, which are prepared by unidirectional or biaxial stretching. However, due to the poor heat and chemical resistance and low mechanical strength of polyolefin materials, it has a certain impact on the safety of lithium-ion batteries, which also restricts the development of related industries to a certain extent. Contents of the invention [0004] The object of the present ...

Claims

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Application Information

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IPC IPC(8): D21B1/30D21D1/02D21H13/06D21H21/08D21H21/10
CPCD21B1/30D21D1/02D21H13/06D21H21/08D21H21/10
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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