Method for preparing aramid composite diaphragm

A technology of aromatic polyamide and composite diaphragm, which is applied in coatings, electrical components, circuits, etc., can solve the problems of unfavorable mass production and poor mechanical properties, and achieve good air permeability, good mechanical properties, and simple preparation methods Effect

Active Publication Date: 2013-08-14
ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diaphragm formed by the papermaking method has poor mechanical properties and is not conducive to mass production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A preparation method of an aromatic polyamide composite diaphragm, comprising the following steps:

[0022] 1) Mix the aromatic polyamide fiber, solvent, co-solvent, and pore-forming agent evenly to make a film-forming liquid;

[0023] 2) Coating the film-forming solution on the original separator of the lithium-ion battery (that is, the blank separator) to obtain a wet film;

[0024] 3) Just dry the wet film; or bake the wet film first, then soak it in water, and finally dry it.

[0025] In step 1), the aromatic polyamide fiber is at least one of meta-aramid staple fiber, meta-aramid fibrid fiber, para-aramid short fiber, and para-aramid fibrid fiber; The solvent described is one of NMP, DMSO, DMF, DMAC; the co-solvent is CaCl 2 , KOH, LiCl, at least one of pyridine; the aramid fiber is 2wt%-20wt% of the solvent; the co-solvent is 5wt%-8wt% of the solvent; the pore-forming agent is BaSO 4 , Al(OH) 3 、Al 2 o 3 , SiO 2 at least one of; the pore-forming agent is 0...

Embodiment 1

[0029] The preparation method of the aromatic polyamide composite diaphragm comprises the following steps:

[0030] Step 1, the NMP-CaCl of 4 parts by weight and the NMP-CaCl of 106.5 parts by weight 2 (CaCl 2 The dosage is 6.5 parts of NMP) and fully stirred and mixed at a temperature of 90°C to prepare a film-forming liquid.

[0031] Step 2, coating the film-forming solution on the polyolefin separator (thickness: 20 μm) to obtain a wet film;

[0032] Step 3, drying the wet film at high temperature to obtain the separator, wherein the high temperature drying temperature is 150°C.

[0033] After relevant tests, the membrane (thickness: 23 μm) prepared in this example has an air permeability of 260 s / 100ml, and its tensile strength is significantly stronger than that of an uncoated polyolefin membrane of the same thickness (48% higher) , it hardly shrinks at high temperatures of 130°C and 150°C, and its thermal shrinkage performance is significantly better than that of the...

Embodiment 2

[0037] The preparation method of the aromatic polyamide composite diaphragm comprises the following steps:

[0038] Step 1, the NMP-CaCl of 4 parts by weight and the NMP-CaCl of 106.5 parts by weight 2 (CaCl 2 The dosage is 6.5 parts of NMP), and the pore-forming agent BaSO is 0.2 parts by weight 4 Thoroughly stir and mix at a temperature of 70° C. to prepare a film-forming liquid.

[0039] Step 2 and Step 3 are the same as in Example 1.

[0040] After relevant tests, the membrane (thickness: 56 μm) obtained in this example has an air permeability of 250 s / 100ml, and its tensile strength is significantly stronger than that of an uncoated polyolefin membrane of the same thickness. (62% higher) , it hardly shrinks at high temperatures of 130°C and 150°C, and its thermal shrinkage performance is significantly better than that of the uncoated polyolefin separator. The thermal shrinkage performance test of the separator in this example is shown in the following table:

[0041]...

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Abstract

The invention discloses a method for preparing an aramid composite diaphragm. The method comprises the following steps of: (1) uniformly mixing aramid fibers, a solvent, a cosolvent and a pore forming agent so as to prepare membrane forming liquid; (2) coating the membrane forming liquid on a diaphragm of a lithium-ion battery so as to obtain a wet diaphragm; and (3) drying the wet diaphragm so as to obtain the aramid composite diaphragm; or firstly baking the wet diaphragm, soaking the wet diaphragm in water and then drying so as to obtain the aramid composite diaphragm. According to the method, the diaphragm is prepared through mixing and coating the aramid fibers and the pore forming agent; the prepared diaphragm has the characteristics of good air permeability, good mechanical properties and strong high-temperature resistance; and the method is simple and convenient, and the preparation cost is saved.

Description

technical field [0001] The invention relates to a preparation method of an aromatic polyamide composite diaphragm. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes. Separator is an important part of lithium-ion battery. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity and cycle performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. At present, most commercial separators use polyethylene (PE) or polypropylene (PP) separators, which have higher porosity, lower electrical resistance, higher tear strength, better acid and alkali resistance, and good Elasticity and retention of aprotic solvents. However, its thermal shrinkage performance is poor, resulting in certain limitations in the safety performance of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/26C08J7/04C08J5/18C08L77/10H01M2/16
CPCY02E60/12Y02E60/10
Inventor 蒋强龙吉冈诚李建利陈光森
Owner ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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