Flame retardant, flame-retardant modified diaphragm, battery and preparation methods of flame retardant and flame-retardant modified diaphragm

A technology of flame retardant and diaphragm, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of poor adhesion and poor cycle stability of batteries, so as to improve the wettability and liquid absorption capacity, and improve cycle stability. The effect of stability and good flame retardant performance

Pending Publication Date: 2022-08-05
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of poor battery cycle stability caused by poor adhesion between the microcapsule structure prepared by conventional microcapsule technology and the binder; Capsule technology can also prepare a flame retardant, a flame retardant modified diaphragm and a preparation method that have extremely high cohesion with the binder and can significantly improve cycle stability.

Method used

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  • Flame retardant, flame-retardant modified diaphragm, battery and preparation methods of flame retardant and flame-retardant modified diaphragm
  • Flame retardant, flame-retardant modified diaphragm, battery and preparation methods of flame retardant and flame-retardant modified diaphragm
  • Flame retardant, flame-retardant modified diaphragm, battery and preparation methods of flame retardant and flame-retardant modified diaphragm

Examples

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Effect test

Embodiment 1

[0039] A kind of flame retardant, its specific preparation method is as follows:

[0040] Take 20g of APP (ammonium polyphosphate) raw material and grind it with a ball mill for 12h, then ultrasonically shake it through a 200-mesh sieve; get 5g of APP after the sieve and 1.2g of 4,4'-dihydroxydiphenyl ether (202g / mol, 0.00594 mol) were dispersed in a 500ml three-necked flask containing 160ml of acetonitrile solvent, and magnetic stirring made it fully dispersed to obtain a mixed solution; 1g of hexachlorocyclotriphosphazene (348g / mol, 0.002874mol) was dissolved in 100ml of acetonitrile to obtain phosphorus Nitrile solution, slowly drop the phosphazene solution into the mixed solution through a constant pressure titration funnel, and add 3 ml of triethylamine to the mixed solution as a pH buffer before adding the phosphazene solution dropwise. The reaction solution was filtered and washed with acetonitrile for more than 3 times. The obtained product was vacuum-dried at 60°C. Af...

Embodiment 2

[0044] A kind of flame retardant, its specific preparation method is as follows:

[0045] Take 20g of APP (ammonium polyphosphate) raw material and grind it with a ball mill for 12h, then ultrasonically vibrate through a 200-mesh sieve; take 4g of sieved APP, Li 3 PO 4 1g and 1.2g of 4,4'-dihydroxydiphenyl ether were dispersed in a 500ml three-necked flask containing 160ml of acetonitrile solvent, and magnetically stirred to make it fully dispersed to obtain a mixed solution; 1g of hexachlorocyclotriphosphazene was dissolved in The phosphazene solution was obtained in 100 ml of acetonitrile, and the phosphazene solution was slowly added dropwise to the mixed solution through a constant pressure titration funnel, and 3 ml of triethylamine was added to the mixed solution as a pH buffer before the dropwise addition of the phosphazene solution. After completion, the reaction solution was kept under reflux at 40°C in a constant temperature magnetic stirrer and stirred continuousl...

Embodiment 3

[0049] A kind of flame retardant, its specific preparation method is as follows:

[0050] Take 20g of APP (ammonium polyphosphate) raw material and grind it with a ball mill for 12h, then ultrasonically shake it through a 200-mesh sieve; take 3.5g of APP, Li 3 PO 4 1.5g and 3.6g of 4,4'-dihydroxydiphenyl ether (202g / mol, 0.01782mol) were dispersed in a 500ml three-necked flask containing 160ml of acetonitrile solvent, and magnetically stirred to fully disperse to obtain a mixed solution; 1g The hexachlorocyclotriphosphazene (348g / mol, 0.002874mol) was dissolved in 100ml acetonitrile to obtain a phosphazene solution, and the phosphazene solution was slowly added dropwise to the mixture through a constant pressure titration funnel, and before the phosphazene solution was added dropwise Add 3 ml of triethylamine to the mixed solution as a pH buffer. After the dropwise addition, keep it in a constant temperature magnetic stirrer to reflux at 40°C, and continue stirring for 6 hou...

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Abstract

The invention discloses a flame retardant, a flame-retardant modified diaphragm, a battery and a preparation method of the flame retardant modified diaphragm, and the flame retardant comprises flame-retardant particles and polyphosphazene which coats the outer surfaces of the flame-retardant particles and is formed by polymerizing phosphazene and hydroxyl-containing organic matters. The flame retardant can overcome the defect of poor battery cycle stability caused by poor binding power between a microcapsule structure prepared by adopting a conventional microcapsule technology and a binder, and effectively improves the performance of the prepared battery while effectively improving the safety performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a flame retardant, a flame retardant modified diaphragm, a battery and a preparation method thereof. Background technique [0002] As a green battery, lithium-ion battery has the advantages of high energy density, high working voltage, high safety performance and long service life. However, in the process of safety testing, such as overcharge, extrusion, acupuncture During the process, it is very easy to cause a short circuit to generate electric sparks, which in turn ignites the electrolyte and explodes, which poses a great safety hazard. The way to improve the safety of lithium-ion batteries is usually achieved by improving the angle of the separator and the electrolyte, while the conventional electrolyte flame retardant additives seriously deteriorate the battery performance, and the flame retardant efficiency is not high. Therefore, it is particularly important to develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/489H01M10/0525H01M50/411H01M50/431H01M50/446C09D5/18C09D109/06C09D101/28
CPCH01M50/449H01M50/446H01M50/431H01M50/411H01M50/489H01M10/0525C09D5/18C09D109/06C09D101/286C08K2003/323C08L2201/02C08K9/10C08K3/32Y02P70/50
Inventor 田贤曜郑军华刘心同沈晓帆师悦
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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