A heat-resistant flame-retardant diaphragm and its preparation method and application

A kind of diaphragm, heat-resistant technology, applied in the field of electrochemistry, can solve the problems of combustion explosion, battery exothermic side reaction, accelerated battery heat accumulation, etc.

Active Publication Date: 2020-10-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if there is no internal short circuit, when the battery is abused or overcharged, it will cause a series of exothermic side reactions inside the battery, accelerate the accumulation of heat inside the battery, and then cause the thermal runaway of the battery, resulting in safety accidents such as combustion and explosion.

Method used

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  • A heat-resistant flame-retardant diaphragm and its preparation method and application
  • A heat-resistant flame-retardant diaphragm and its preparation method and application
  • A heat-resistant flame-retardant diaphragm and its preparation method and application

Examples

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Effect test

Embodiment 1

[0049] A heat-resistant and flame-retardant diaphragm of the present embodiment and a preparation method thereof comprise the following steps:

[0050] (1) 95 parts by mass of zinc borate powder with a particle diameter of about 600nm, 3 parts by mass of styrene-butadiene rubber, 2 parts by mass of sodium carboxymethyl cellulose, solvent ethanol solution, the volume ratio of water and ethanol in the ethanol solution 1:1, formulated as a flame retardant slurry with a solid content of 10%, coated on the surface of a single layer of microporous commercial polyethylene (PE) diaphragm, dried to remove the solvent, and then coated with flame retardant function Coated diaphragm;

[0051] (2) Dip the above diaphragm coated with a flame-retardant functional coating layer in a 30 g / L polyimide N-methylpyrrolidone solution, dry it, and remove the solvent to obtain a heat-resistant and flame-retardant diaphragm.

[0052] The heat-resistant and flame-retardant diaphragm prepared in this e...

Embodiment 2

[0054] The difference between embodiment 2 and embodiment 1 is:

[0055] (1) 90 parts by mass of ammonium polyphosphate powder with a particle diameter of about 500nm, 5 parts by mass of gelatin, 2 parts by mass of polyvinyl alcohol, and the solvent is a water / isopropanol mixture with a volume ratio of 2:1 to prepare a solid The flame retardant slurry with a content of 15% is coated on the double-layer surface of a commercial polypropylene (PP) diaphragm with microporosity, and dried to remove the solvent, so as to obtain a diaphragm coated with a flame-retardant functional coating layer.

[0056] (2) Dip the above diaphragm coated with a flame-retardant functional coating layer in a 40 g / L polyarylether N,N-dimethylformamide solution, dry it, and remove the solvent to obtain a heat-resistant and flame-retardant diaphragm.

Embodiment 3

[0058] The difference between embodiment 3 and embodiment 1 is:

[0059] (1) 92 parts by mass of melamine sodium urate powder with a particle diameter of about 800nm, 8 parts by mass of polyvinylidene fluoride, using acetone as a solvent, prepare a flame retardant slurry with a solid content of 12%, and coat it on a micro Porous commercial polyacrylonitrile organic microporous membrane base material single-layer surface, drying to remove solvent, promptly obtains the membrane coated with the flame-retardant function coating layer.

[0060] (2) Spray-coat 80 g / L ethanol solution of phenolic resin on the surface of the diaphragm coated with the flame-retardant functional coating layer, dry it, and remove the solvent to obtain a heat-resistant flame-retardant diaphragm.

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Abstract

The invention discloses a heat-resistant and flame-retardant diaphragm, a preparation method and application thereof. The cost of the preparation method of the present invention is controllable, the preparation process is simple to operate, and is suitable for large-scale production; the prepared heat-resistant and flame-retardant diaphragm has a double-layer composite structure with both thermal stability and flame-retardant performance, which can prevent the battery from operating at a lower temperature. Internal short circuit occurs, which causes severe thermal runaway of the battery, which leads to safety accidents of combustion and explosion; it can also effectively prevent the combustion and explosion of the battery after thermal runaway occurs in the case of overcharging, puncture, abuse, etc., in chemical power systems, especially It has good application in lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a heat-resistant and flame-retardant diaphragm, a preparation method and application thereof. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it has been applied in the field of electric vehicles in recent years, which is expected to replace traditional fuel vehicles and solve the problems of energy depletion and environmental pollution. [0003] The diaphragm is an important part of ensuring the safety of lithium-ion batteries. It mainly plays the role of isolating the positive and negative electrodes to prevent short circuits and infiltrating the electroly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42H01M50/403H01M50/446H01M50/457H01M50/489H01M50/491
CPCH01M10/0525H01M10/4235H01M2220/30H01M2220/20H01M50/446H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 赵金保彭龙庆张鹏
Owner XIAMEN UNIV
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