Preparation method of high-performance composite diaphragm and composite diaphragm

A composite diaphragm, high-performance technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of lower puncture strength than wet diaphragm and low tensile strength, so as to improve thermal safety and increase tensile strength , to avoid the effect of short circuit

Active Publication Date: 2014-07-02
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an important disadvantage of the dry-processed separator is that the tensile strength in the TD (transverse)

Method used

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  • Preparation method of high-performance composite diaphragm and composite diaphragm
  • Preparation method of high-performance composite diaphragm and composite diaphragm
  • Preparation method of high-performance composite diaphragm and composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] A method for preparing a high-performance composite diaphragm includes the following steps:

[0030] Step 1: Apply a layer of treatment liquid on one side of the dry uniaxially stretched polyolefin membrane to improve the adhesion between the nano-polyimide fiber layer and the polyolefin membrane layer;

[0031] Step 2: Dissolve the dibasic organic acid anhydride and organic diamine in a polar aprotic solvent to prepare a polyimide, and redissolve the polyimide in a polar aprotic solvent to obtain a spinning dope;

[0032] Step 3: Use the electrospinning method to spray the spinning dope on the polyolefin membrane treated in step 1, and the polyolefin membrane is fixed on a receiver, wherein the TD direction of the polyolefin membrane is the same as the rotation direction of the drum Consistent, the electrospinning temperature is 15~90℃, forming a primary polymer composite membrane with oriented nano-polyimide fiber layer;

[0033] Step 4: The primary polymer composite diaphrag...

Example Embodiment

[0045] Example 1

[0046] Accurately weigh 2.1812g of pyromellitic anhydride (PMDA) and 2.023g of 4,4'-diaminodiphenyl ether (ODA) into 25ml of N,N-dimethylacetamide (DMAc), and stir at low temperature for 8 Within hours, a polyamic acid (PAA-1) solution was obtained. Subsequently, a mixed solution of acetic anhydride and triethylamine (volume ratio 1:1.5) was added, and the reaction was continued for 24 hours to obtain a yellow uniform and transparent polyimide solution. This solution was deposited in an excess ethanol / water mixture, washed, filtered, and dried to obtain polyimide (PI-1).

[0047] Weigh an appropriate amount of PI-1 and redissolve it in DMAc to prepare a spinning dope with a solid content of 15% for electrospinning. The spinning conditions are: spinning voltage 20kv, advancing speed 2.0mm / min, receiving distance 25mm, ambient temperature 25°C, and ambient humidity 35%. Spread a layer of two-component PU adhesive on the polypropylene diaphragm to increase the co...

Example Embodiment

[0048] Example 2

[0049] The preparation of the spinning dope is the same as in Example 1.

[0050] Spinning conditions: spinning voltage 15kv, advancing speed 1.5mm / min, receiving distance 15mm, ambient temperature 25°C, ambient humidity 35%. Spread a layer of two-component PU adhesive on the polypropylene diaphragm to increase the connectivity with the nanofibers, and then fix it on the roller, with the TD direction consistent with the direction of rotation of the roller. During collection, the linear speed of the roller was 1.4 m / min, and the thickness of the oriented nanofiber layer was 10 μm. The prepared composite film is hot-pressed and shaped at 60° C. and the residual solvent is removed to obtain an oriented polyimide nanofiber / PP composite film.

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Abstract

The invention discloses a preparation method of a high-performance composite diaphragm. The preparation method comprises the following steps of 1, smearing a layer of processing liquid on one side of a dry-method unilaterally stretched polyolefin diaphragm; 2, dissolving binary organic anhydride and organic diamine in a polarity aprotic solvent to obtain polyimide, and re-dissolving the polyimide in the polar aprotic solvent to obtain a spinning crude solution; 3, spraying the spinning crude solution on the polyolefin diaphragm processed in the step 1 by utilizing an electrostatic spinning method to form a primary polymer composite diaphragm with an oriented nano polyimide fiber layer; and 4, processing the primary polymer composite diaphragm obtained in the step 3 in the hot air of 50 to 100 DEG C for 1 hour to 12 hours to be dried, and after-treating (such as hot-pressing for shaping) the composite diaphragm to obtain the polymer composite diaphragm. The invention also discloses a composite diaphragm prepared by utilizing the preparation method. The prepared composite diaphragm has the advantages that the strength and safety of the dry-method unilaterally stretched polyolefin diaphragm can be effectively improved.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a method for preparing a high-performance composite diaphragm capable of effectively improving the strength and safety performance of a dry-process uniaxially stretched polyolefin diaphragm and the composite diaphragm. Background technique [0002] With the popularity of 3C products and the rise of the electric vehicle market, the demand for lithium-ion secondary batteries is increasing. As a key component of lithium-ion batteries, the performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. Therefore, the development of high-performance separators has become an important direction to improve the performance of lithium batteries, especial...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M50/403H01M50/417H01M50/423H01M50/44H01M50/449H01M50/454H01M50/457
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 吴术球冯涛鲁东奎
Owner SHENZHEN SENIOR TECH MATERIAL
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