Organic-inorganic composite lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and inorganic composite technology, which is applied to battery components, chemical instruments and methods, circuits, etc., can solve the problems that the diaphragm is easy to be melted by high temperature, explode, and discharge power is large, and achieve micropore penetration and high temperature good stability effect

Inactive Publication Date: 2014-03-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large discharge power and high heat generation of high-power lithium-ion batteries, the diaphragm is easily melted by high temperature, so that the positive and negative electrodes of the battery are connected to each other through the electrolyte, resulting in a short circuit and a large amount of discharge in the battery, making it explosive. danger

Method used

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  • Organic-inorganic composite lithium ion battery diaphragm and preparation method thereof
  • Organic-inorganic composite lithium ion battery diaphragm and preparation method thereof
  • Organic-inorganic composite lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Polyethylene (PE) 28g, SiO 2 Add 2.1g and 39.2g of dioctyl phthalate (DOP) into the internal mixer, and stir at 180°C for 0.5h to obtain a homogeneous solution;

[0038] 2. Keep the obtained homogeneous solution at 200°C for 5 minutes under a pressure of 2Mpa, press it into a flat film with a thickness of 100 μm, put the flat film into 20°C water for rapid cooling, and take it out after holding it for 10 minutes;

[0039] 3. Put the cooled flat film into cyclohexane for extraction, change the cyclohexane solution every 8 hours, extract three times in total, put the extracted film in an oven at 60°C for 6 hours, take it out, and obtain the compound Polyethylene diaphragm.

[0040] The cross-sectional scanning electron micrograph of gained composite polyethylene diaphragm is as follows figure 2 shown by figure 2 It can be seen that the section of the diaphragm is loose and porous, and the pore size is large; the test results of the thickness, pore size, liquid abs...

Embodiment 2

[0042] 1. Polyethylene (PE) 26g, SiO 2 Add 3.25g and 35.75g of dioctyl phthalate (DOP) into the internal mixer, and stir at 200°C for 0.5h to obtain a homogeneous solution;

[0043] 2. Keep the obtained homogeneous solution at 200°C for 5 minutes under a pressure of 2Mpa, press it into a flat film with a thickness of 100 μm, put the flat film into 20°C water for rapid cooling, and take it out after holding it for 10 minutes;

[0044]3. Put the cooled flat film into cyclohexane for extraction, change the cyclohexane solution every 8 hours, extract three times in total, put the extracted film in an oven at 60°C for 6 hours, take it out, and obtain the compound Polyethylene diaphragm.

[0045] The cross-sectional scanning electron micrograph of gained composite polyethylene diaphragm is as follows image 3 shown by image 3 It can be seen that the section of the diaphragm is loose and porous, and the pore size is large; the test results of the thickness, pore size, liquid abso...

Embodiment 3

[0053] 1. Polyethylene (PE) 26g, SiO 2 Add 3.25g and 35.75g of dioctyl phthalate (DOP) into the internal mixer, and stir at 180°C for 1 hour to obtain a homogeneous solution;

[0054] 2. For the obtained homogeneous solution, heat it for 5 minutes at 200°C and a pressure of 2Mpa, press it into a flat film with a thickness of 500 μm, put the flat film into 20°C water for rapid cooling, and take it out after holding it for 10 minutes;

[0055] 3. Fix the cooled flat film on a stretching machine for two-way thermal stretching. The temperature of the stretching machine is 120°C, and the stretching ratio is 1:5. After stretching, remove the stretched film and put it into ethanol for extraction. , change the ethanol solution every 8 hours, and extract three times in total; then put the extracted film in an oven at 60°C for 6 hours, take it out, and obtain a composite polyethylene diaphragm.

[0056] The test results about the thickness, pore size, liquid absorption rate and heat sh...

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Abstract

The invention discloses an organic-inorganic composite lithium ion battery diaphragm and a preparation method thereof. The diaphragm is a composite membrane formed by reinforcing organic resin by inorganic particles, wherein the inorganic particles account for 0.1 percent by mass to 20 percent by mass and the organic resin accounts for 10 percent by mass to 70 percent by mass. Preparation of the diaphragm comprises the following steps of: firstly, stirring the organic resin, the inorganic particles and a diluent according to a certain proportion at a temperature of 150 to 280 DEG C to form homogeneous solution; then carrying out hot-pressing on the obtained homogeneous solution at a temperature of 150 to 220 DEG C to form a flat sheet membrane with a thickness of 20 to 1,000 micron; cooling the flat sheet membrane to the room temperature by adopting water bath with a temperature of 0-100 DEG C or at a cooling speed of 0-200 DEG C/min; finally, carrying out operation of firstly stretching and then extracting or firstly extracting and then stretching and drying processing on the cooled flat sheet membrane. The diaphragm provided by the invention has the advantages of easiness for controlling the porosity, adjustability for the aperture, micropore penetration, good high-temperature stability and the like.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm and a preparation method thereof, in particular to an organic-inorganic composite lithium-ion battery diaphragm and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] Since the lithium-ion battery was successfully developed, it has been widely used in the fields of mobile phones, portable computers, cameras, video cameras and other electronic products due to its excellent performance such as high working voltage, high energy density, low pollution, and no memory effect. In recent years, some emerging fields such as hybrid vehicles, electric vehicles, and aircraft models have put forward higher requirements for lithium-ion batteries. Due to the potential explosion hazard of lithium-ion batteries, especially in the use of high-power lithium-ion batteries, its safety is more severely challenged. How to obtain lithium-ion batteries w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/18B32B27/32H01M50/403H01M50/446
CPCH01M50/446H01M50/403Y02E60/10
Inventor 张春江夏咏锋左开慧曾宇平
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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