Lithium ion secondary battery porous multilayer diaphragm and manufacture method thereof

A secondary battery and lithium-ion technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor consistency of diaphragm thickness and complicated process, and achieve the effects of improving porosity, ensuring safety, and ensuring permeability

Active Publication Date: 2012-03-28
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

The coating is formed by laminating porous layers formed by heat-resistant polymers by a wet coagulation method. It needs to go through processes such as coagulation liquid coagulation, water washing to remove coagulation liquid and drying water, etc. The process is complicated, and the thickness of the diaphragm is consistent. poor

Method used

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  • Lithium ion secondary battery porous multilayer diaphragm and manufacture method thereof

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Effect test

Embodiment 1

[0038] Add 10g of polyethylene terephthalate (PET, melting point 256-265°C) into a beaker containing 100g of N,N-dimethylformamide (DMF) solvent, heat to 80°C, and stir Stir slowly until the resin dissolves. Add 10g of magnesium oxide (MgO, with an average particle size of 500nm) into the above solution evenly, stir evenly, and continue to stir for 60 minutes to obtain a uniform suspension. During the stirring process, the mouth of the beaker should be sealed to reduce the volatilization of the solvent. Heat the polyethylene microporous base film with a thickness of 20 μm and a porosity of 50% to 100°C, and apply the above suspension on the polyethylene microporous base film at a coating speed of 5 cm / s by scraping. On the porous base film, the temperature for controlling the volatilization of the solvent is 80°C, and the time for controlling the volatilization of the solvent by blowing is 60S; then the above-mentioned coating steps are carried out on the side that is not coat...

Embodiment 2

[0040] Add 10 g of polyacrylonitrile into a beaker containing 100 g of N,N-dimethylformamide (DMF) solvent, heat to 80° C., and stir slowly with a stirrer until the resin dissolves. 10g of alumina (Al 2 o 3 , with an average particle size of 500nm) evenly added to the above solution, stirred evenly, and continued to stir for 60 minutes to obtain a uniform suspension. During the stirring process, the mouth of the beaker should be sealed to reduce the volatilization of the solvent. The polyethylene microporous base film with a rate of 50% was heated to 100°C, and the above suspension was coated on the polyethylene microporous base film at a coating speed of 5 cm / s by scraping, The temperature for controlling the volatilization of the solvent is 80°C, and the time for controlling the volatilization of the solvent by blowing is 100 seconds; then the above-mentioned coating steps are carried out on the side that is not coated with the suspension, so that both sides are uniformly a...

Embodiment 3

[0042] Add 10g of polyvinylidene fluoride into a beaker containing 100g of N-methylpyrrolidone solvent, heat to 80°C, and stir slowly with a stirrer until the resin dissolves. 20g of silicon dioxide (SiO 2 , with an average particle size of 500nm) evenly added to the above solution, stirred evenly, and continued to stir for 60 minutes to obtain a uniform suspension. During the stirring process, the mouth of the beaker should be sealed to reduce the volatilization of the solvent. The polyethylene microporous base film with a rate of 50% was heated to 100°C, and the above suspension was coated on the polyethylene microporous base film at a coating speed of 5 cm / s by scraping, The temperature for controlling the volatilization of the solvent is 80°C, and the time for controlling the volatilization of the solvent by blowing is 60S; then carry out the above-mentioned coating steps on the side that is not coated with the suspension, so that both sides are uniformly attached with hea...

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Abstract

The invention relates to the technical field of lithium ion battery and specifically relates to a lithium ion secondary battery porous multilayer diaphragm and a manufacture method thereof. The porous multilayer diaphragm comprises a polyolefin porous membrane and at least one layer of heatproof coating layer coated on the polyolefin porous membrane; the heatproof coating layer comprises heatproof resin and inorganic insulating particles in a mass ratio of 1:0.5-5. The porous multilayer diaphragm prepared by steps of preparing coating liquid, coating, stretching and fixing has excellent heat resistance; the heatproof coating is also a film with micropore structure and enough high amount of porosity and heat resistance temperature; even a microporous base film is fused and ruptured, the coating can still maintain integrity thereof and obstruct direct contact of cell electrodes, so as to guarantee cell safety; the heatproof coating layer communicates with micropores of the microporous film of the matrix film layer to guarantee permeation performance of lithium ions.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a porous multilayer separator for lithium ion secondary batteries and a manufacturing method thereof. Background technique [0002] Rechargeable lithium-ion secondary batteries have the advantages of high working voltage, high energy density, long cycle life, no memory effect, no pollution, and fast charging and discharging. They are widely used in daily electronics, electrical appliances and digital products. Broad market space and good development prospects. With the increasing demand for the quality of portable batteries, lithium-ion secondary batteries have become a hot spot in the research of new power supply technologies in recent years. Seeking higher energy density of lithium-ion secondary batteries is an important direction of current research, followed by the technical problem of how to ensure the safety of lithium batteries. [0003] Polymer diaphragm i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/32B32B27/08B32B3/24H01M50/414H01M50/449H01M50/457H01M50/489H01M50/491
CPCH01M10/0525H01M2/16H01M2/1653B32B27/32B32B27/08Y02E60/12H01M2/1686C08J2323/06C08J2333/20C08J2467/02C08J7/0427Y02E60/10H01M50/449H01M50/414H01M50/491H01M50/489H01M50/457
Inventor 王松钊王辉蔡朝辉吴耀根廖凯明
Owner 河南惠强新能源材料科技股份有限公司
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