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A kind of modified non-woven lithium ion battery diaphragm and preparation method thereof

A technology of lithium ion battery and non-woven fabric is applied in the field of preparation of the battery separator, which can solve the problems of easy water absorption, low strength and poor heat resistance of the separator.

Active Publication Date: 2016-08-24
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 modified non-woven lithium-ion battery separator, and the present invention A preparation method of the battery separator is also provided

Method used

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  • A kind of modified non-woven lithium ion battery diaphragm and preparation method thereof
  • A kind of modified non-woven lithium ion battery diaphragm and preparation method thereof
  • A kind of modified non-woven lithium ion battery diaphragm and preparation method thereof

Examples

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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℃ 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 fluorosurfact...

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 substrates.

Embodiment 3

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

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Abstract

The invention relates to a modified non-woven fabric separator for lithium ion batteries. The separator comprises a modified non-woven fabric base material and a composite filler thereof. The modified non-woven fabric base material includes a low-melting point material and a high-melting point material. , the low melting point material is subjected to melt crystallization treatment, the weight of the high melting point material is 85-99.9% of the total weight of the base material, and the balance is the low melting point material; the filler compounded on the modified non-woven fabric base material, including An organic polymer, and a first filler material and / or a second filler material. The invention also relates to a method for preparing the battery separator, which sequentially includes the following steps: making a non-woven fiber layer; making a modified non-woven base material; preparing a filler slurry; filling; removing a solvent; and post-processing. The method has simple operation and low cost, and the prepared product has low moisture content, good chemical stability and high mechanical strength, and improves the yield, service life and safety of the battery.

Description

technical field [0001] The invention relates to a 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 of se...

Claims

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Application Information

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Patent Type & Authority Patents(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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