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Thermal-resistant and flame-retardant membrane and preparation method thereof, and applications

A diaphragm and heat-resistant technology, applied in the field of electrochemistry, can solve problems such as battery thermal runaway, battery exothermic side reactions, and accelerated battery heat accumulation

Active Publication Date: 2019-09-13
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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  • Thermal-resistant and flame-retardant membrane and preparation method thereof, and applications
  • Thermal-resistant and flame-retardant membrane and preparation method thereof, and applications
  • Thermal-resistant and flame-retardant membrane and preparation method thereof, and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A heat-resistant and flame-retardant diaphragm of this embodiment and a preparation method thereof include 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 embodimen...

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 present invention discloses a thermal-resistant and flame-retardant membrane and a preparation method thereof, and applications. According to the preparation method, the cost is controllable, theoperation of the preparation process is simple, and thus the preparation method is suitable for mass production. The prepared thermal-resistant and flame-retardant membrane has a double-layer composite structure with both thermal stability and flame retardancy, the membrane can prevent internal short circuit of a battery at a lower temperature, so that severe thermal runaway of the battery is prevented, and thus safety accidents, such as burning and explosion are prevented; the membrane can effectively prevent the battery from burning and exploding after the thermal runaway of the battery occurs under the conditions of overcharge, puncture and abuse; and the membrane has good applications in the chemical power supply system, especially 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 Applications(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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