Flame retardant, preparation method and application thereof

A technology of flame retardant and aliphatic alkyl, which is applied in the field of flame retardant and its preparation, can solve the problems of reducing the ionic conductivity of the electrolyte, battery reversibility, and large damage to the graphite negative electrode, and achieves obvious flame retardant effect and high conductivity. The effect of small influence and simple preparation process

Inactive Publication Date: 2019-05-10
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Although the flame retardant effect of these flame retardants is better, the phosphate ester will greatly damage the graphite negative electrode, and will reduce the ionic conductivity of the electrolyte and the reversibility of the battery, etc.

Method used

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  • Flame retardant, preparation method and application thereof
  • Flame retardant, preparation method and application thereof
  • Flame retardant, preparation method and application thereof

Examples

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preparation example Construction

[0028] The present invention also provides the preparation method of above-mentioned flame retardant, and this preparation method comprises the following steps:

[0029] 1) At a certain reaction temperature, DOPO is added to olefin ester monomers to obtain a mixed solution containing white precipitate;

[0030] 2) After the mixed solution in step 1) is suction filtered, the solid is collected and vacuum-dried;

[0031] The reaction formula of step 1) is as follows:

[0032]

[0033] Among them, R 2 for C 1 -C 4 One or more combinations of aliphatic alkyl, alkenyl, and carboxylic acid groups; R 3 selected from hydrogen, C 1 -C 4 One or more combination of aliphatic alkyl group, alkenyl group, carboxylic acid group, and carboxylate group.

[0034] Preferably, the olefin ester monomer is an unsaturated carboxylic acid ester, and its general structural formula is shown in Formula II:

[0035]

[0036] Preferably, the reaction temperature of the above preparation meth...

Embodiment 1

[0049] (1) Preparation of Flame Retardant (I)

[0050] in N 2 Under the protection of , add 54g DOPO and 30g methyl methacrylate into a three-necked flask, and react for 3-5h at a reaction temperature of 140°C. After the temperature is lowered to room temperature, a white solid (I) is obtained, and excess methyl methacrylate is removed by filtration. methyl acrylate to obtain compound (I), ie flame retardant (I); the compound (I) has a purity of 99% and a yield of 92.3%. The structural formula of compound (I) is shown in formula III:

[0051]

[0052] (2) Preparation of positive pole piece

[0053] Mix lithium nickel cobalt aluminate, acetylene black, and polyvinylidene fluoride according to the mass ratio of 96:2:2, add N-methylpyrrolidone, and stir the mixture at high speed to obtain a uniform positive electrode slurry and coat it on an aluminum foil After drying, the positive electrode sheet is obtained.

[0054] (3) Preparation of negative pole piece

[0055] Mix g...

Embodiment 2

[0061] (1) Preparation of Flame Retardant (II)

[0062] Under the protection of N2, add 54g DOPO and 34g perfluoroalkyl ethyl acrylate into a three-necked flask, react at a reaction temperature of 150°C for 5-6h, and after the temperature is lowered to room temperature, a white solid (II) is obtained, which is filtered Excess perfluoroalkyl ethyl acrylate was removed to obtain compound (II), ie flame retardant (II); compound (II) had a purity of 98.5% and a yield of 91.2%. The structural formula of compound (II) is shown in formula IV:

[0063]

[0064] (2) and (3) The positive pole piece and the negative pole piece are the same as those in Embodiment 1, and will not be repeated here.

[0065] (4) Preparation of electrolyte solution (II)

[0066] Add non-aqueous organic solvent (non-aqueous organic solvent according to ethylene carbonate (EC): dimethyl carbonate (DMC): ethyl methyl carbonate (EMC): propylene carbonate (PC) = 3:4:2:1 mass ratio mixed evenly), lithium salt...

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Abstract

The invention provides a flame retardant, which has a more obvious flame retardant effect compared with the conventional flame retardant. The invention further provides a preparation method of the flame retardant, the method has the characteristics of simple preparation process and low cost. The invention further provides a lithium battery electrolyte which is added with the flame retardant, can maintain good conductivity and has better compatibility with the negative electrode of the lithium battery, and can ensure that the lithium battery has better electrochemical performance and a better flame retardant effect at the same time. The invention further provides a lithium battery, which comprises the lithium battery electrolyte. The lithium battery not only has good electrochemical performance, but also has a good flame retardant effect and is safer in use.

Description

【Technical field】 [0001] The present invention relates to the technical field related to flame retardants and lithium battery electrolytes with flame retardant properties, in particular to a flame retardant and its preparation method and application. 【Background technique】 [0002] Lithium batteries have the advantages of high specific energy, high voltage, many cycle times, and long storage time. They are not only widely used in portable electronic devices, such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles, storage Energy base stations, and large and medium-sized electric equipment such as electric tools. With the continuous expansion of the lithium battery market, safety issues have gradually become the main obstacle for the application of lithium batteries in electric products. Since the electrolyte of lithium batteries is generally composed of organic solvents, and these solvents are mostly flammable, if the battery is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6571H01M10/052H01M10/0567
CPCY02E60/10
Inventor 高鹏黄杰李群
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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