Modified cyclic phosphazene flame-retardant additive for lithium battery electrolyte and preparation method

A technology of flame retardant additive and cyclic phosphazene, which is applied in the field of modified cyclic phosphazene flame retardant additive for lithium battery electrolyte and its preparation, can solve the problems of high viscosity, reduction of electrolyte conductivity, deterioration of battery performance and the like, Achieve the effect of increasing the reduction potential, optimizing the interface SEI film, and improving the conductivity

Active Publication Date: 2020-05-15
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although organophosphorus flame retardants have a good flame retardant effect, due to their high viscosity, the conductivity of the electrolyte is reduced to a certain extent, and the performance of the battery is deteriorated, which has become its application limit in the electrolyte.

Method used

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  • Modified cyclic phosphazene flame-retardant additive for lithium battery electrolyte and preparation method
  • Modified cyclic phosphazene flame-retardant additive for lithium battery electrolyte and preparation method
  • Modified cyclic phosphazene flame-retardant additive for lithium battery electrolyte and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Add hexachlorocyclotriphosphazene and hydroquinone into the solvent acetone, use benzyltriethylammonium chloride as a catalyst, react at 80°C for 3 hours, filter, wash and dry to obtain hexachlorocyclotriphosphazene and hydroquinone (4-hydroxyphenoxy)cyclotriphosphazene; the mass ratio of hexachlorocyclotriphosphazene, hydroquinone, acetone, and benzyltriethylammonium chloride is 1:2:80:0.03;

[0035] (2) Mix graphene nanosheets with oxalic acid, add them to a high-energy ball mill, mill them in a carbon dioxide atmosphere for 15 hours, and dry to remove oxalic acid after discharge to obtain carboxylated graphene; graphene nanosheets, oxalic acid The mass ratio of the high energy ball mill is 5:100; the rotating speed of the high energy ball mill is 240r / min, and every running 25min pauses for 5min;

[0036] (3) Add carboxylated graphene into dimethyl sulfoxide, ultrasonically disperse for 20 minutes, then add hexa(4-hydroxyphenoxy)cyclotriphosphazene, use concentra...

Embodiment 2

[0039] (1) Add hexachlorocyclotriphosphazene and hydroquinone into the solvent acetone, use benzyltriethylammonium chloride as a catalyst, react at 70°C for 5 hours, filter, wash and dry to obtain hexachlorocyclotriphosphazene and hydroquinone (4-hydroxyphenoxy)cyclotriphosphazene; the mass ratio of hexachlorocyclotriphosphazene, hydroquinone, acetone, and benzyltriethylammonium chloride is 1:2:80:0.03;

[0040] (2) Mix graphene nanosheets with oxalic acid, add them to a high-energy ball mill, mill them in a carbon dioxide atmosphere for 10 hours, and dry them after discharging to remove oxalic acid to obtain carboxylated graphene; graphene nanosheets, oxalic acid The mass ratio is 3:100; the rotating speed of high-energy ball mill is 240r / min, every running 20min pauses 5min;

[0041](3) Add carboxylated graphene to dimethyl sulfoxide, ultrasonically disperse for 40 minutes, then add hexa(4-hydroxyphenoxy)cyclotriphosphazene, use concentrated sulfuric acid as catalyst, react ...

Embodiment 3

[0044] (1) Add hexachlorocyclotriphosphazene and hydroquinone into the solvent acetone, use benzyltriethylammonium chloride as a catalyst, react at 75°C for 4 hours, filter, wash and dry to obtain hexachlorocyclotriphosphazene and hydroquinone (4-hydroxyphenoxy)cyclotriphosphazene; the mass ratio of hexachlorocyclotriphosphazene, hydroquinone, acetone, and benzyltriethylammonium chloride is 1:2:80:0.03;

[0045] (2) Mix graphene nanosheets with oxalic acid, add them to a high-energy ball mill, mill in a carbon dioxide atmosphere for 12 hours, and dry to remove oxalic acid after discharge to obtain carboxylated graphene; graphene nanosheets, oxalic acid The mass ratio of the high-energy ball mill is 4:100; the rotating speed of the high-energy ball mill is 240r / min, and every running 22min pauses for 5min;

[0046] (3) Add carboxylated graphene to dimethyl sulfoxide, ultrasonically disperse for 30 minutes, then add hexa(4-hydroxyphenoxy)cyclotriphosphazene, use concentrated sul...

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Abstract

The invention relates to the technical field of lithium batteries, and provides a modified cyclic phosphazene flame-retardant additive for a lithium battery electrolyte and a preparation method. The method comprises the following steps: preparing hexa(4-hydroxyphenoxy) cyclotriphosphazene by taking hexachlorocyclotriphosphazene and hydroquinone as raw materials; then carrying out mixing and ball milling on graphene nanosheets and oxalic acid, and grafting a carboxyl group on the surface of the graphene; then grafting the carboxylated graphene onto a side chain of hexa(4-hydroxyphenoxy) cyclotriphosphazene, so as to prepare graphene grafted phenoxy cyclotriphosphazene; and finally, performing substitution reaction on phenoxy on the side chain of cyclotriphosphazene by using fluorine gas toprepare graphene grafted perfluorophenoxy cyclotriphosphazene. Compared with the traditional method, the flame-retardant additive prepared by the invention not only can enable a lithium battery to have good flame-retardant performance, but also can improve the conductivity of the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and provides a modified cyclic phosphazene 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6593H01M10/0567
CPCC07B2200/11C07F9/65815H01M10/0567Y02E60/10
Inventor 蔡杰
Owner SHUANGDENG GRP
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