Battery diaphragm formed by aramid fibers and preparation method thereof

A technology of battery separator and aramid fiber, applied in the field of battery separator and its preparation, can solve the problems of poor air permeability of polyolefin separator, unable to meet the fast charging and discharging of battery, affecting the cycle life of battery, etc., and achieve excellent mechanical strength. Effect

Active Publication Date: 2014-07-23
YANTAI METASTAR SPECIAL PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the polyolefin separator has poor air permeability and cannot well meet the needs

Method used

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  • Battery diaphragm formed by aramid fibers and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weighing of raw materials: Weigh raw materials according to the following mass ratios: 80% of aramid 1414 pulp, 10% of aramid 1313 ultrafine chopped fibers, and 10% of aramid 1313 precipitated fibers;

[0029] Raw material pretreatment: Prepare the weighed raw materials to make aqueous solution respectively, the preparation process is as follows:

[0030] A. Use deionized water to prepare aramid 1414 pulp into an aqueous solution with a concentration of 10%, beating until the degree of beating is 25°SR, and then disperse evenly in deionized water to prepare aramid 1414 pulp with a concentration of 0.1% aqueous solution;

[0031] B. Aramid 1313 ultrafine chopped fibers are uniformly dispersed in deionized water, and the concentration is prepared into an aqueous solution of 0.04% aramid 1313 ultrafine chopped fibers;

[0032] C. Use deionized water to prepare aramid 1313 precipitated fiber into an aqueous solution with a concentration of 0.1%, beating until the degree of...

Embodiment 2

[0037] Weighing of raw materials: Weigh raw materials according to the following mass ratios: 10% of aramid 1414 pulp, 40% of aramid 1313 superfine chopped fibers, 10% of aramid 1313 ultra-long fibers, and 40% of aramid 1313 precipitated fibers;

[0038] Raw material pretreatment: Prepare the weighed raw materials to make aqueous solution respectively, the preparation process is as follows:

[0039] A. Use deionized water to prepare aramid 1414 pulp into an aqueous solution with a concentration of 30%, beating until the degree of beating is 70°SR, and then disperse evenly in deionized water to prepare aramid 1414 pulp with a concentration of 1%. aqueous solution;

[0040] B. Aramid 1313 ultrafine chopped fibers are uniformly dispersed in deionized water, and the concentration is prepared into an aqueous solution of 0.5% aramid 1313 ultrafine chopped fibers;

[0041] C. the aramid 1313 ultra-long fiber is uniformly dispersed in deionized water by an ultrasonic dispersion proce...

Embodiment 3

[0047] Weighing of raw materials: Weigh raw materials according to the following mass ratios: 40% of aramid 1414 pulp, 5% of aramid 1313 superfine chopped fibers, 5% of aramid 1313 ultra-long fibers, and 50% of aramid 1313 precipitated fibers;

[0048] Raw material pretreatment: Prepare the weighed raw materials to make aqueous solution respectively, the preparation process is as follows:

[0049] A. Use deionized water to prepare aramid 1414 pulp into an aqueous solution with a concentration of 15%, beating until the degree of beating is 30°SR, and then disperse evenly in deionized water to prepare aramid 1414 pulp with a concentration of 0.5% aqueous solution;

[0050] B. Aramid 1313 ultrafine chopped fibers are uniformly dispersed in deionized water, and the concentration is prepared into an aqueous solution of 0.2% aramid 1313 ultrafine chopped fibers;

[0051] C. the aramid 1313 ultra-long fibers are uniformly dispersed in deionized water by an ultrasonic dispersion proces...

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Abstract

The invention discloses a battery diaphragm formed by aramid fibers. The battery diaphragm is prepared from the following raw materials in proportion: 10-80% of aramid fiber 1414 pulp, 5-40% of aramid fiber 1313 superfine chopped fiber, less than or equal to 10% of aramid fiber 1313 overlength fiber, and 10-50% of aramid fiber 1313 fiber. A preparation process of the battery diaphragm formed by aramid fibers comprises the following steps: (1) weighing raw materials; (2) carrying out pretreatment on the raw materials; (3) preparing a sizing material and adding a static remover; (4) diluting the sizing material; (5) squeezing, drying, hot rolling, rolling paper, rewinding, cutting off and packaging to prepare the battery diaphragm. The battery diaphragm formed by aramid fibers has excellent mechanical strength, thermal stability, fatigue resistance and chemical corrosion resistance, and can be widely applied to the production of ion batteries.

Description

technical field [0001] The invention relates to a battery separator, in particular to a battery separator made of aramid fibers and a preparation method thereof. Background technique [0002] The separator is an important part of the lithium-ion battery, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and other characteristics of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] At present, the lithium-ion battery separator is mainly polyolefin separator, which has a small enough pore size to effectively prevent the internal short circuit of the battery, and has good uniformity, which can effectively ensure the charge and discharge performance of the battery. However, during the application process, if the battery suffers from thermal runaway due to internal short circuit or overcharge, ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/44H01M50/489H01M50/491H01M50/494H01M50/497
CPCH01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 王志新孙静张峻华孙岩磊王川光
Owner YANTAI METASTAR SPECIAL PAPER
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