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Polyphosphazene composite flame retardant additive for lithium battery electrolyte and preparation method thereof

A composite flame retardant and polyphosphazene technology, which is applied in the manufacture of lithium batteries, electrolyte batteries, secondary batteries, etc., can solve the problems of reducing the conductivity of the electrolyte, deteriorating battery performance, and limiting applications, so as to reduce the increase in viscosity, Stable structure and improved electrical conductivity

Inactive Publication Date: 2021-02-05
徐州宝盈新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyphosphazene, like other organophosphorus flame retardants, has a good flame retardant effect, but due to its high viscosity, it will increase the viscosity of the electrolyte after full contact with the solvent, and reduce the conductivity of the electrolyte to a certain extent. Deteriorate battery performance, limiting the application in electrolyte

Method used

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  • Polyphosphazene composite flame retardant additive for lithium battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add hexachlorocyclotriphosphazene into 1,2,4-trichlorobenzene, stir until completely dissolved, then add sulfamic acid, heat to 120°C for 8 hours, and filter to obtain a solid, first use absolute ethanol Wash 3 times, then wash 3 times with deionized water, and dry in vacuum at 70°C for 24 hours to obtain chain polydichlorophosphazene; hexachlorocyclotriphosphazene, 1,2,4-trichlorobenzene, sulfonic acid The mass ratio of the catalyst is 5:100:0.5;

[0027] (2) Add polydichlorophosphazene to absolute ethanol, ultrasonically disperse for 20 minutes, then add tetramethoxysilane, stir and react at room temperature for 30 minutes, and filter with suction to obtain polybis(trimethoxysiloxy)phosphazene ; The mass ratio of polydichlorophosphazene, tetramethoxysilane, and dehydrated alcohol is 6:20:100;

[0028] (3) Add polybis(trimethoxysiloxy)phosphazene to magnesium chloride solution with a mass concentration of 5%, hydrolyze to obtain polybis(trihydroxysiloxy)phosphazen...

Embodiment 2

[0030] (1) Add hexachlorocyclotriphosphazene into 1,2,4-trichlorobenzene, stir until completely dissolved, then add trifluoromethanesulfonic acid, heat to 140°C for 6 hours, and filter to obtain a solid. Wash 3 times with water and ethanol, then wash 3 times with deionized water, and dry in vacuum at 90°C for 18 hours to obtain chain polydichlorophosphazene; hexachlorocyclotriphosphazene, 1,2,4-trichlorobenzene, The mass ratio of sulfonic acid catalyst is 10:100:0.8;

[0031] (2) Add polydichlorophosphazene to absolute ethanol, ultrasonically disperse for 40 minutes, then add tetramethoxysilane, stir and react at room temperature for 50 minutes, and filter with suction to obtain polybis(trimethoxysiloxy)phosphazene ; The mass ratio of polydichlorophosphazene, tetramethoxysilane, and dehydrated alcohol is 8:20:100;

[0032] (3) Add polybis(trimethoxysiloxy)phosphazene to magnesium chloride solution with a mass concentration of 10%, hydrolyze to obtain polybis(trihydroxysiloxy)...

Embodiment 3

[0034] (1) Add hexachlorocyclotriphosphazene into 1,2,4-trichlorobenzene, stir until completely dissolved, then add sulfamic acid, heat to 130°C for 7 hours, and filter to obtain a solid, first use absolute ethanol Wash 3 times, then wash 3 times with deionized water, and dry in vacuum at 80°C for 22 hours to obtain chain polydichlorophosphazene; hexachlorocyclotriphosphazene, 1,2,4-trichlorobenzene, sulfonic acid The mass ratio of the catalyst is 7:100:0.6;

[0035] (2) Add polydichlorophosphazene to absolute ethanol, ultrasonically disperse for 30 minutes, then add tetramethoxysilane, stir and react at room temperature for 40 minutes, and filter with suction to obtain polybis(trimethoxysiloxy)phosphazene ; The mass ratio of polydichlorophosphazene, tetramethoxysilane, and dehydrated alcohol is 7:20:100;

[0036](3) Add polybis(trimethoxysilyloxy)phosphazene to magnesium chloride solution with a mass concentration of 8%, hydrolyze to obtain polybis(trihydroxysiloxy)phosphaze...

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Abstract

The invention relates to the technical field of lithium batteries, and provides a polyphosphazene composite flame-retardant additive for lithium battery electrolyte and a preparation method thereof. In this method, chain-like polydichlorophosphazene is obtained by ring-opening polymerization of hexachlorocyclotriphosphazene; then tetramethoxysilane is used for substitution reaction to obtain polybis(trimethoxysilyloxy)phosphazene; Hydrolysis to obtain polybis(trihydroxysiloxy)phosphazene; finally, through the reaction of magnesium chloride and sodium hydroxide, nano-sized magnesium hydroxide is generated and precipitated on the surface of polybis(trihydroxysiloxy)phosphazene, and carried out Dehydration condensation, made polyphosphazene composite flame retardant additive. Compared with the traditional method, the flame retardant additive prepared by the invention can not only make the lithium battery have good flame retardant performance, but also improve the conductivity of the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and provides a polyphosphazene composite flame-retardant additive for lithium battery electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high voltage, no memory effect, good environmental protection, and long service life. They are a reliable energy source and are widely used as power sources for portable electronic products. However, under abuse, such as thermal shock, overcharge, short circuit, etc., lithium batteries can cause thermal runaway, which can lead to accidents such as fire and explosion. Especially in the application of large-capacity power sources such as electric vehicles, safety issues are particularly important. [0003] The electrolyte of lithium batteries is mainly composed of organic solvents, lithium salts, and additives. Commonly used organic solvents are alkyl carbonate co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/052H01M10/42A62C3/16
CPCA62C3/16H01M10/052H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 蔡杰
Owner 徐州宝盈新能源科技有限公司
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