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Preparation method of organic-inorganic composite separator material, and organic-inorganic composite separator material and application thereof

A diaphragm material and inorganic composite technology, applied in the direction of electrical components, electrochemical generators, circuits, etc., can solve the problems of thermal shrinkage of the diaphragm, poor ability to absorb electrolytes, poor mechanical strength, etc.

Inactive Publication Date: 2019-06-07
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, polyolefin microporous films are mainly used in industry. However, traditional lithium battery separators have many shortcomings, such as poor mechanical strength, weak thermal stability, and poor ability to adsorb electrolytes; There is internal stress in the process, and stress release will occur at high temperature, and the diaphragm will shrink thermally, so there is a safety problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of organic-inorganic composite diaphragm material, uses Al 2 o 3 Coating plant cellulose, using plant cellulose extracted from straw as raw material, preparing a cellulose diaphragm by spin coating, and then coating a layer of Al on the prepared diaphragm 2 o 3 For ceramic materials, follow the steps below:

[0024] Add 5 g of nanocellulose solution with a fiber length of 1-5 μm and 0.2 g of sodium carboxymethyl cellulose into 20 mL of deionized water, stir magnetically for 30-60 min, and use a spin coater to prepare a cellulose separator;

[0025] 1g Al 2 o 3 Add 2g of polyvinylidene fluoride to 30mL of a mixed solution of N-methylpyrrolidone and acetone, the volume ratio is 1:2, stir in a water bath at 80°C for 4h, and then use a wiper to coat the previously prepared On the cellulose separator, the obtained composite separator was placed in a vacuum drying oven at 60° C. for 2 hours to obtain the final product.

Embodiment 2

[0027] A kind of preparation method of organic-inorganic composite membrane material, similar to embodiment 1, according to the following steps:

[0028] Add 5 g of nanocellulose solution with a fiber length of 10-20 μm and 0.2 g of sodium carboxymethyl cellulose into 20 mL of deionized water, stir magnetically for 30-60 min, and use a spin coater to prepare a cellulose separator;

[0029] 1g Al 2 o 3 Add 2g of polyvinylidene fluoride to 30mL of a mixed solution of N-methylpyrrolidone and acetone (volume ratio: 1:2), stir in a water bath at 80°C for 4 hours, and then use a wiper to coat the previously prepared On the cellulose separator, the obtained composite separator was placed in a vacuum oven and dried at 60° C. for 2 hours to obtain the final product.

Embodiment 3

[0031] A kind of preparation method of organic-inorganic composite membrane material, similar to embodiment 1, according to the following steps:

[0032] Add 5 g of micron cellulose solution and 0.2 g of sodium carboxymethyl cellulose into 20 mL of deionized water, stir magnetically for 30-60 min, and use a spin coater to prepare a cellulose diaphragm;

[0033] 1g Al 2 o 3 Add 2g of polyvinylidene fluoride to 30mL of a mixed solution of N-methylpyrrolidone and acetone (volume ratio: 1:2), stir in a water bath at 80°C for 4 hours, and then use a wiper to coat the previously prepared On the cellulose separator, the obtained composite separator was placed in a vacuum oven and dried at 60° C. for 2 hours to obtain the final product.

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Abstract

The present invention provides a preparation method of an organic-inorganic composite separator material, and an organic-inorganic composite separator material and application thereof. Plant celluloseis coated with Al2O3, the plant cellulose extracted from straws is taken as raw materials, a cellulose separator is prepared by employing a spin-coating method, and the prepared separator is coated with a layer of Al2O3 ceramic material. The heat stability of the cellulose separator is obviously superior to that of a polyolefin separator, and the cellulose separator is low in cost and environmentally friendly. A ceramic separator has a good heat-resistance performance and can effectively avoid the heat shrinkage effect. Therefore, the lithium-ion battery separator prepared by combining the plant cellulose and the ceramic material has the better high-resistance stability. The preparation process of the separator is relatively simple and easy to operate.

Description

technical field [0001] The present invention designs a preparation method and application of a new type of composite diaphragm material, especially relates to a preparation method and application of a composite diaphragm prepared from cellulose materials and ceramic materials, specifically a preparation method of an organic-inorganic composite diaphragm material and its products and application. Background technique [0002] As a new energy source, lithium-ion secondary batteries have the advantages of high charging and discharging voltage platform, long cycle life, no pollution, and small self-discharge. With the continuous development of new energy sources, the market demand for lithium batteries is also increasing. As one of the key components of the lithium-ion secondary battery, the separator material directly affects the performance of the lithium battery, and even the safety of the battery. The study found that a separator material with excellent performance should ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCY02E60/10
Inventor 何丹农王惠亚张芳赵立敏张道明吴晓燕卢玉英金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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