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Electrostatic spinning method-based functional lithium ion battery separator and preparation method thereof

A technology of lithium-ion batteries and electrospinning, which is applied to secondary batteries, battery pack components, circuits, etc., can solve problems such as shedding, internal short circuit of iron single substance, etc., to avoid safety problems, maintain capacity retention rate, and improve The effect of thermal safety

Inactive Publication Date: 2018-07-20
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

[0005] The present invention aims at problems such as the ceramic shedding of the existing ceramic-coated lithium-ion separator, the internal short circuit caused by the simple iron in the lithium iron phosphate positive electrode, etc., and provides a functional lithium-ion battery separator based on the electrospinning method, which has high temperature resistance and Strong iron ion adsorption capacity can greatly improve the thermal safety and capacity retention rate of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A functional lithium-ion battery separator based on the electrospinning method. The dry-process single-drawn polypropylene separator (thickness 5um, porosity 30%) is used as the base film, and citric acid (CA) and polyacrylonitrile (PAN ) The composite solution is a spinning solution, which is spun on the base film to form a coating. Among them, the molecular weight of the polymer polyacrylonitrile (PAN) is 30,000, and the coating thickness is 3um.

[0027] The above-mentioned preparation method of the functional lithium-ion battery diaphragm based on the electrospinning method, the specific steps are:

[0028] The first step, the preparation of spinning solution: citric acid (CA) and polyacrylonitrile (PAN) are mixed and dispersed in trifluoroformic acid (citric acid (CA) and polyacrylonitrile (PAN) The ratio of the total mass to trifluoroformic acid is 1:3), stirred at a speed of 400rpm for 0.5h, and then left to swell for 4h;

[0029] The second step, electrospinni...

Embodiment 2

[0032] A kind of functional lithium-ion battery diaphragm based on electrospinning method, dry-process double-stretched polypropylene diaphragm (thickness is 60um, porosity 50%) is base film, ethylenediaminetetraacetic acid (EDTA) and polyvinyl alcohol ( The composite solution of PVA) is a spinning solution, which is spun on the base film to form a coating. Wherein, the polymer polyvinyl alcohol (PVA) molecular weight is 300,000, and the coating thickness is 20um.

[0033] The above-mentioned preparation method of the functional lithium-ion battery diaphragm based on the electrospinning method, the specific steps are:

[0034]The first step, the preparation of spinning solution: ethylenediaminetetraacetic acid (EDTA) and polyvinyl alcohol (PVA) are mixed and dispersed in chloroform at a mass ratio of 1:100 (ethylenediaminetetraacetic acid (EDTA) and polyethylene The ratio of the total mass of alcohol (PVA) to chloroform is 1:6), stirred at 2000rpm for 4h, and left to swell fo...

Embodiment 3

[0037] A functional lithium-ion battery separator based on the electrospinning method, with a wet-process polyethylene separator (20um in thickness and 40% porosity) as the base film, aminotriacetic acid (NTA) and polyimide (PI ) The composite solution is a spinning solution, which is spun on the base film to form a coating. Among them, the molecular weight of the polymer polyimide (PI) is 100,000, and the coating thickness is 5um.

[0038] The above-mentioned preparation method of the functional lithium-ion battery diaphragm based on the electrospinning method, the specific steps are:

[0039] The first step, the preparation of spinning solution: aminotriacetic acid (NTA) and polyimide (PI) are mixed and dispersed in N,N-dimethylformamide (aminotriacetic acid (NTA) by mass ratio 1:30 ) and the total mass of polyimide (PI) and the solvent ratio are 1:4), stirred at 1200rpm for 2h, and left to swell for 6h;

[0040] The second step, electrospinning coating: the solution obtai...

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Abstract

The invention relates to an electrostatic spinning method-based functional lithium ion battery separator and a preparation method thereof. The functional lithium ion battery separator takes a porous polyolefin separator as a base film, a composite solution of an organic metal ion chelating agent and a high-melting point polymer is used as a spinning solution and is used for spin-coating the base film to form a coating layer. By the coated lithium ion battery separator, the temperature during out-of-control of a lithium ion battery is raised due to high temperature resistance (about 300 DEG C)of the high-melting point polymer, the base film is molten, the high-melting point polymer is extremely high in stability, and the thermal safety of the lithium ion battery can be substantially improved; and moreover, the organic ion chelating agent in hybrid co-spinning is used for coating a surface of the separator, metal iron ions are contained in the chelating agent by a strong bonding effectof chelating molecules and metal ions to become a stable compound with larger molecular weight, so that the metal iron ions are prevented from penetrating through the lithium ion separator and drifting away to a negative electrode of the battery and is further reduced to elemental iron to cause micro short circuit of the battery, and a series of safety problems are prevented.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a functional lithium-ion battery separator based on an electrospinning method and a preparation method thereof. Background technique [0002] The lithium-ion battery separator refers to the polymer separator between the positive and negative electrodes of the lithium-ion battery. It is the most critical part of the lithium-ion battery and has a direct impact on the safety and cost of the battery. Different types of batteries use different separators. For lithium battery series, high-strength thin-film polyolefin porous membranes are generally used. The main function of the diaphragm is to prevent the direct contact of the positive and negative electrodes to form a short circuit; to allow the lithium ions in the liquid electrolyte to pass through freely; The overheating of the battery and the increase of the current can prevent the explosion caused by the short ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/491
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 唐浩林王红兵王锐马兴玉徐明赵俊东
Owner 河南惠强新能源材料科技股份有限公司
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