Preparation method of cellulose and polyarylester fibre-based battery diaphragm

A technology of polyarylate fiber and battery separator, which is applied to battery components, circuits, electrical components, etc., and can solve the problems of battery separator materials such as poor wettability of aramid fiber and polyarylate fiber, high cost and lack of market prospects , to achieve the effect of improving high cost, low cost and high mechanical strength

Active Publication Date: 2018-04-13
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cost of polyarylate fiber is high, and the use of polyarylate fiber as a battery separator material will cause the cost of the battery separator to be much higher than that of conventional materials on the market, which does not have a good market prospect; on the other hand, polyarylate fiber The arylate macromolecular chain contains ester functional groups. Although the wettability of the material is better than that of polyolefin materials, it is worse than that of aramid fibers containing amide functional groups on the molecular chain. It is not as good as aramid fibers when directly used as a battery separator material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw materials were weighed according to the following mass fractions: 35% polyarylate fiber pulp, 50% polyarylate short fiber, 5% polyarylate long fiber, and 10% cellulose pulp.

[0037] Prepare a 30wt% aqueous solution of polyarylate fiber pulp, soak for 15 hours, ultrasonically disperse for 2 hours, and then process it through a tank beater with a beating degree of 45°SR. Dilute the 30wt% aqueous solution of polyarylate fiber pulp with deionized water To a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, add to the deflagger for dispersion, the speed of the deflaker is 3000r / min, and vigorously stir for 20min to obtain slurry A.

[0038] Dilute the polyarylate staple fibers with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.5wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fibers evenly with a decomposer In deionized...

Embodiment 2

[0043] Raw materials were weighed according to the following mass fractions: 35% polyarylate fiber pulp, 40% polyarylate short fiber, 5% polyarylate long fiber, and 20% cellulose pulp.

[0044] Prepare a 30wt% aqueous solution of polyarylate fiber pulp, soak for 15 hours, ultrasonically disperse for 2 hours, and then process it through a tank beater with a beating degree of 45°SR. Dilute the 30wt% aqueous solution of polyarylate fiber pulp with deionized water To a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, add to the deflagger for dispersion, the speed of the deflaker is 3000r / min, and vigorously stir for 20min to obtain slurry A.

[0045] Dilute the polyarylate staple fibers with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.4wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fibers evenly with a decomposer In deionized...

Embodiment 3

[0050] Raw materials were weighed according to the following mass fractions: 35% polyarylate fiber pulp, 30% polyarylate short fiber, 5% polyarylate long fiber, and 30% cellulose pulp.

[0051] Prepare a 30wt% aqueous solution of polyarylate fiber pulp, soak for 15 hours, ultrasonically disperse for 2 hours, and then process it through a tank beater with a beating degree of 45°SR. Dilute the 30wt% aqueous solution of polyarylate fiber pulp with deionized water To a concentration of 1wt%, ultrasonically disperse for 1h, add 0.02wt% dispersant polyethylene oxide, add to the deflagger for dispersion, the speed of the deflaker is 3000r / min, and vigorously stir for 20min to obtain slurry A.

[0052] Dilute the polyarylate staple fibers with an aqueous solution containing 0.1wt% sodium dodecylbenzenesulfonate at 60°C to a concentration of 0.3wt%, soak for 2 hours, disperse ultrasonically for 30 minutes, and disperse the polyarylate staple fibers evenly with a decomposer In deionized...

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Abstract

The invention discloses a preparation method of a cellulose and polyarylester fibre-based battery diaphragm. The preparation method comprises the steps of preparing polyarylester fiber pulp, polyarylester short fibers, polyarylester long fibers and cellulose pulp, performing pulping on the four kinds of raw materials, and next, performing papermaking with pulp and forming. By preparing the cellulose-based battery diaphragm from cellulose and polyarylester, the advantage complementation of cellulose and polyarylester is played in a manner of overcoming own weak points by learning from each other's strong points; the prepared battery diaphragm material is excellent in wetting performance, high in mechanical strength, and reasonable in cost; by virtue of formula adjustment and process improvement, the problems of fiber scattering, dispersing and like caused in papermaking process for preparing the polyarylester fibre-based battery diaphragm can be solved; and the cellulose and polyarylester fibre-based battery diaphragm is prepared successfully.

Description

technical field [0001] The invention relates to the technical field of a lithium battery separator, in particular to a preparation method of a cellulose and polyarylate fiber-based battery separator. Background technique [0002] As the most critical inner layer component in lithium battery technology, the diaphragm has a great impact on the performance of lithium batteries, so the diaphragm material in lithium battery technology is very important. At present, the most widely used diaphragm materials are still PE, PP and PE / PP composite materials, but some new diaphragm materials, such as polyester, polyimide, polyamide, cellulose, spandex, and aramid materials, have gradually become more High-efficiency, stable and safe lithium battery diaphragm materials have occupied the high-end lithium battery market. [0003] Polyarylate is a thermotropic liquid crystal polymer material. Polyarylate fiber is called aromatic polyester fiber. It is a new type of special synthetic fiber....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/44H01M50/489H01M50/491H01M50/497
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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