Novel modified non-woven fabric lithium-ion battery diaphragm and preparation method thereof

A technology of lithium-ion batteries and non-woven fabrics, applied in the field of preparation of the battery diaphragm, can solve the problems of poor heat resistance, easy water absorption of the diaphragm, and low strength

Active Publication Date: 2014-07-16
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of existing lithium-ion battery separators such as easy water absorption, poor heat resistance, and low strength, thereby improving the service life and safety of lithium-ion batteries, the present invention provides a new type of modified non-woven lithium-ion battery separator. The invention also provides a preparation method of the battery diaphragm

Method used

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  • Novel modified non-woven fabric lithium-ion battery diaphragm and preparation method thereof
  • Novel modified non-woven fabric lithium-ion battery diaphragm and preparation method thereof
  • Novel modified non-woven fabric lithium-ion battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 95g of high-melting-point PET fibers with a melting point of 250°C and 5g of low-melting-point PET fibers with a melting point of 150°C were made into a non-woven fiber web layer by wet papermaking, and the non-woven fiber web layer was melted and crystallized at a temperature of 155 ℃, and then cooled to obtain a modified non-woven fabric substrate 1 with a porosity of 58%, an average pore diameter of 11um, a puncture strength of 3.0N, a heat shrinkage of 1% at 150°C for 1h, and a thickness of 16um;

[0050] Get filler 2, said filler includes Al2O3, PVDF;

[0051] Dry the non-woven fabric treated by melt crystallization at a temperature of 90°C for 1 min, put 40g of aluminum oxide with a particle size of 250nm into an oven at a temperature of 100°C. The time is 4h.

[0052] Mix 20g of PVDF with a melting point of 165°C, 500g of acetone and 20g of ethanol, heat and stir, heat and stir at 60°C until clarified, add dried aluminum oxide, 0.5g of PVP and 1g of fluorosurfac...

Embodiment 2

[0056] The modified non-woven lithium-ion battery separator was prepared according to the method of Example 1, except that only 0.5 g of PET fibers with a melting point of 150 ° C and a low melting point were added to obtain a puncture strength of 2.2 N and a heat shrinkage of 0.5 at 150 ° C for 1 h. % of non-woven fabric substrates.

Embodiment 3

[0058] Prepare the modified non-woven lithium-ion battery separator according to the method of Example 1, except that 16.8g of low-melting PET fibers with a melting point of 150°C are added to obtain a puncture strength of 3.2N and a heat shrinkage of 5% at 150°C for 1h. non-woven substrate.

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Abstract

The invention relates to a novel modified non-woven fabric lithium-ion battery diaphragm. The diaphragm comprises a modified non-woven fabric base material and a filling agent compounded on the modified non-woven fabric base material, wherein the modified non-woven fabric base material comprises a low-smelting-point material and a high-smelting-point material; the low-smelting-point material is subjected to melt crystallization treatment and the weight of the high-smelting point material accounts for 85-99.9% of the total weight of the base material; the residual amount is the low-smelting point material; the filling agent compounded on the modified non-woven fabric base material comprises organic polymer, a first filling material and/or a second filling material. The invention further relates to a preparation method of the battery diaphragm. The preparation method sequentially comprises the following steps: manufacturing a non-woven fabric fiber layer; manufacturing the modified non-woven fabric base material; preparing filling agent slurry; filling; removing a solvent; and carrying out post-treatment. The method is simple in operation and low in cost; a prepared product is low in water content, good in chemical stability and high in mechanical strength; the finished product rate of a battery is increased, the service life is prolonged and the safety is improved.

Description

technical field [0001] The invention relates to a novel modified non-woven lithium ion battery diaphragm, and also relates to a preparation method of the battery diaphragm. Background technique [0002] The polyethylene and polypropylene separators currently commercially used are more suitable for digital batteries such as mobile phones and cameras. However, this type of separator has some disadvantages: on the one hand, because the melting temperature of polyolefin is lower than 165°C, when the external temperature of the battery is too high or when the battery is accidentally hit, the separator may be melted, resulting in a short circuit of the battery, which will cause the battery to burn and explode. ; On the other hand, polyolefin has poor electrophilic ability and insufficient ability to maintain electrolyte, resulting in poor performance of battery cycle life and high current charge and discharge. The lack of safety performance and electrical performance of this type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/411H01M50/414H01M50/417H01M50/423H01M50/429H01M50/44H01M50/443H01M50/489H01M50/491
CPCH01M50/446H01M50/491H01M50/429H01M50/414H01M10/0525Y02E60/10H01M50/44H01M50/4295H01M50/426H01M50/403H01M50/431H01M50/417H01M50/437H01M50/489H01M50/443Y02P70/50
Inventor 林妙云黄美容吴耀根蔡朝辉廖凯明
Owner 河南惠强新能源材料科技股份有限公司
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