Preparation method of high-safety lithium-ion battery separator

A lithium-ion battery, high-safety technology, applied in the preparation of lithium-ion battery diaphragm, the preparation of high thermal stability battery diaphragm, high mechanical strength, can solve the problems of low safety, high price of high temperature resistant polymers, etc., to improve The effect of strength, mild process conditions, and easy industrial production

Active Publication Date: 2016-05-11
湖北江升新材料有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low safety and high price of high-temperature-resistant polymers in the current lithium-ion battery polyolefin separator, the purpose of the present invention is to provide a method for preparing a high-safety lithium-ion battery separator. The battery separator prepared by this method is Sandwich structure composite membrane, the polyvinylidene fluoride layer in the middle reduces the amount of polyimide material with high price, reduces the cost, and also provides the function of self-closing pores for the diaphragm

Method used

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  • Preparation method of high-safety lithium-ion battery separator

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Embodiment 1

[0030] Example 1: Dissolve 1 mol of 1,2',3,3'-benzophenone tetracarboxylic dianhydride, 0.5 mol of m-phenylenediamine and 0.5 mol of 4,4'-diaminobiphenyl in N,N-dimethyl Among the acetamides, the mass of N,N-dimethylacetamide is 1,2',3,3'-benzophenone tetracarboxylic dianhydride, m-phenylenediamine and 4,4'-diaminobis 10 times the total mass of benzene, and the dissolution temperature is 50°C to obtain a precursor solution. The prepared precursor solution is injected into a syringe in a high-voltage electrospinning device, and a metal needle is assembled on the syringe, and the metal needle is connected to one pole of a high-voltage power supply. Install the cylinder wrapped in aluminum foil on the receiving device, set the spinning parameters as: bias voltage 10kV, working distance 8cm, feed speed 50uL / h, and start electrospinning. After spinning, a white polyamic acid oriented film can be obtained. Take out the aluminum foil covering the polyamic acid film, put it in a dry...

Embodiment 2

[0031]Example 2: Dissolve 1mol2,2',3,3'-biphenyltetracarboxylic dianhydride and 1mol2,4-diaminotoluene in N,N-dimethylacetamide, N,N-dimethyl The mass of acetamide is 20 times of the total mass of 2,2',3,3'-biphenyltetracarboxylic dianhydride and 2,4-diaminotoluene, and the dissolution temperature is 15°C to obtain a precursor solution. The prepared precursor solution is injected into a syringe in a high-voltage electrospinning device, and a metal needle is assembled on the syringe, and the metal needle is connected to one pole of a high-voltage power supply. Install the cylinder wrapped in aluminum foil on the receiving device, set the spinning parameters as: bias voltage 15kV, working distance 8cm, feed speed 800uL / h, and start electrospinning. After spinning, a white polyamic acid oriented film can be obtained. Take out the aluminum foil covering the polyamic acid film, put it in a drying oven and gradually raise the temperature for imidization. The heating method is: keep...

Embodiment 3

[0032] Example 3: Dissolve 1mol of 1,2',3,3'-benzophenone tetracarboxylic dianhydride and 1mol of m-phenylenediamine in N,N-dimethylacetamide, N,N-dimethyl The mass of acetamide is 10-20 times of the total mass of 1,2',3,3'-benzophenone tetracarboxylic dianhydride and m-phenylenediamine, and the dissolution temperature is 30° C. to obtain a precursor solution. The prepared precursor solution is injected into a syringe in a high-voltage electrospinning device, and a metal needle is assembled on the syringe, and the metal needle is connected to one pole of a high-voltage power supply. Install the cylinder wrapped in aluminum foil on the receiving device, set the spinning parameters as follows: bias voltage 15kV, working distance 20cm, feed speed 600uL / h, and start electrospinning. After spinning, a white polyamic acid oriented film can be obtained. Take out the aluminum foil covering the polyamic acid film, put it in a drying oven and gradually raise the temperature for imidiza...

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Abstract

The invention discloses a preparation method of a high-safety lithium-ion battery separator. The method comprises the following main steps: dissolving a polybasic organic carboxylic acid anhydride and organic diamine to obtain a precursor solution; preparing a polyamide acid film by an electrospinning technique; carrying out gradient heating imidization on the polyamide acid film to obtain a polyimide film; preparing a polyvinylidene fluoride film by a nonsolvent-induced phase separation method; and putting two soaked polyimide alignment films in the direction in which film fibers are vertical to each other in an overlapping manner, putting one soaked polyvinylidene fluoride film in the middle and preparing a PI / PVDF / PI composite film by a hot pressing compound method. By a three-layer composite structure, a PVDF middle layer is introduced to reduce the amount of a PI raw material; and meanwhile, the self-closing function is provided for the separator. Pretreatment is carried out on the film before the composite film is prepared, so that separator composition is relatively tight. A structure that the fibers of the two PI alignment films are vertical to each other is adopted for film composition, so that the strength of the composite film is significantly improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery separator, belonging to the field of lithium-ion battery materials. In particular, it relates to a method for preparing a battery diaphragm with high mechanical strength and high thermal stability. Background technique [0002] As a high-energy green secondary battery, lithium-ion batteries have been widely used in new energy fields such as smart mobile devices, hybrid vehicles, and solar power generation systems. These fields not only require batteries to have high energy and power density, but also have higher and higher requirements for the safety of lithium-ion batteries. [0003] As the "third electrode" of lithium-ion batteries, the separator has a significant impact on the safety of the battery. The current research mainly improves its safety performance from two aspects: on the one hand, research and development of high-temperature resistant diaphragm materials; 2 ) unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M50/403H01M50/411H01M50/417H01M50/44H01M50/457H01M50/489H01M50/491
CPCH01M10/058H01M50/403H01M50/411H01M50/44Y02E60/10Y02P70/50
Inventor 刘久清吴秀锋
Owner 湖北江升新材料有限公司
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