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Lithium battery isolation membrane and method for manufacturing same

A manufacturing method and isolation film technology, which can be applied to battery pack components, circuits, electrical components, etc., and can solve problems such as battery short circuit and high temperature combustion.

Inactive Publication Date: 2010-01-27
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of polypropylene is higher than that of polyethylene, so in the polypropylene / polyethylene / polypropylene three-layer composite layer structure, when the polyethylene melts and shuts down, the outer layer of polypropylene still remains. Maintain good mechanical properties. If the temperature continues to rise, the polypropylene will melt and cause a short circuit in the battery. There is still a risk of high temperature combustion

Method used

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  • Lithium battery isolation membrane and method for manufacturing same
  • Lithium battery isolation membrane and method for manufacturing same
  • Lithium battery isolation membrane and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment 1

[0027] First, 60 grams of high-density polyethylene and 40 grams of low-molecular-weight wax (with 18 carbon atoms) were placed in a kneader and mixed at 150° C. for 30 minutes. Then, the mixed polyethylene resin solution is coated on the polyacrylonitrile (PAN) non-woven fabric by thermal coating, the coating temperature is 170°C, and the pressure is controlled at 40-70kg / cm 2 In the range. Next, the polyethylene resin is laminated with the PAN non-woven fabric to form a composite film. Finally, the composite membrane was placed in hexane to extract the small molecular weight wax, and then pressed to form a porous high-density polyethylene / PAN non-woven composite membrane with an average pore size of 28 microns, a thickness of 27 microns and a porosity of 63. %.

[0028] refer to figure 2 The DSC thermogram of the shown porous high-density polyethylene / PAN nonwoven composite film. It can be seen from the figure that the composite film manufactured in this example only ha...

Embodiment 2

[0032] First, 70 grams of high-density polyethylene and 30 grams of low molecular weight wax (with 18 carbon atoms) were placed in a kneader and mixed at 150° C. for 30 minutes. Then, apply the mixed polyethylene resin solution on the polyacrylonitrile (PAN) non-woven fabric by thermal coating, the coating temperature is 170°C, and the pressure is controlled at 40-70kg / cm 2 In the range. Next, the polyethylene resin is laminated with the PAN non-woven fabric to form a composite film. Finally, the composite membrane is placed in hexane to extract the small molecular weight wax, and then pressed to make a porous high-density polyethylene / PAN non-woven composite membrane, which has an average pore size of 22 microns, a thickness of 24 microns and a porosity of 49%.

Embodiment 3

[0034] First, 80 grams of high-density polyethylene and 20 grams of low-molecular-weight wax (with 18 carbon atoms) were placed in a kneader and mixed at 150° C. for 30 minutes. Then, apply the mixed polyethylene resin solution on the polyacrylonitrile (PAN) non-woven fabric by thermal coating, the coating temperature is 170°C, and the pressure is controlled at 40-70kg / cm 2In the range. Next, the polyethylene resin is laminated with the PAN non-woven fabric to form a composite film. Finally, the composite membrane is placed in hexane to extract the small molecular weight wax, and then pressed to make a porous high-density polyethylene / PAN non-woven composite membrane, which has an average pore size of 28 microns, a thickness of 28 microns and a porosity of 42%.

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Abstract

The invention provides a lithium battery isolation membrane and a method for manufacturing same. The lithium battery isolation membrane comprises a porous support substrate made of fibers, and porous polyolefin resin filled into gaps of the substrate. The invention also provides the method for manufacturing the lithium battery isolation membrane, which comprises the following steps: mixing polyolefin with a pore-forming agent to form the polyolefin mixed resin; coating the polyolefin mixed resin on the porous support substrate; pressing the polyolefin mixed resin and the support substrate to fill the polyolefin mixed resin into the gaps of the support substrate; and removing the pore-forming agent to form the porous isolation membrane.

Description

technical field [0001] The invention relates to a fiber matrix, in particular to a separator for lithium batteries. Background technique [0002] Lithium battery or lithium ion battery is mainly composed of a positive electrode of lithium alloy oxide, a liquid organic electrolyte, a separator and a negative electrode composed of carbon materials. The organic electrolyte exists in the pores of the battery structure and is responsible for ion Conduction, and the isolation film between the positive and negative electrodes is used to isolate the positive and negative electrodes to avoid short circuit. [0003] In general, the basic requirements for battery separators include: can separate the positive and negative electrodes, porous structure, good mechanical strength and elasticity, corrosion resistance to electrolyte, oxidation resistance, stable chemical properties, light and thin volume and electrolyte High content etc. Especially for high-performance batteries, it is more...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16C08J9/26C08L23/00H01M50/403H01M50/417H01M50/491
CPCY02E60/12Y02E60/10
Inventor 陈文亿陈联泰郑淑蕙于薇伶张峻绮
Owner IND TECH RES INST
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