A kind of organosiloxane flame retardant and its preparation method and application

A technology of organic siloxane and flame retardant, which is applied in the field of electrochemistry, can solve the problems of decreased conductivity, large addition amount, and increased cost, and achieve the effects of low viscosity, small addition amount, and little influence on electrical properties

Active Publication Date: 2020-12-01
CHENGDU GUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the siloxane in the above two examples can improve the stability and flame retardancy of the electrolyte, the silicon content in the structure is relatively low (15%-18%), and the flame retardancy of the silicon element is not fully utilized, resulting in If the amount added is large, the conductivity will decrease and the cost will increase

Method used

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  • A kind of organosiloxane flame retardant and its preparation method and application
  • A kind of organosiloxane flame retardant and its preparation method and application
  • A kind of organosiloxane flame retardant and its preparation method and application

Examples

Experimental program
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Effect test

preparation example 1

[0038] Preparation Example 1: Preparation of Phenylsiloxane

[0039]Dimethylphenylvinylsilane is used as raw material, and it is mixed with octamethyldihydrotetrasiloxane, decamethyldihydropentasiloxane and dodecamethyldihydrohexasiloxane at a molar ratio of 1:1. Alkane and hexadecylmethyldihydrooctasiloxane were mixed, Karstedt catalyst was added, the temperature was raised to 80° C. under the protection of nitrogen, and the crude product was obtained after 4 hours of reaction. Then carry out rectification to remove unreacted raw materials, then add 10% activated carbon adsorption catalyst, stir at 70°C for 10 hours, then heat filter, remove activated carbon, and obtain pure phenylsiloxanes with different silicon contents. Phenylsiloxane obtained by reacting with octamethyldihydrotetrasiloxane, decamethyldihydropentasiloxane, dodecamethyldihydrohexasiloxane, hexadecylmethyldihydrooctasiloxane The alkane products are respectively marked as A, B, C, and D, and the calculated s...

preparation example 2

[0040] Preparation Example 2: Preparation of Fluorosiloxane

[0041] Vinyl (trifluoromethyl) dimethylsilane is used as raw material, and it is mixed with octamethyldihydrotetrasiloxane, decamethyldihydropentasiloxane and dodecamethyldihydrotetrasiloxane at a molar ratio of 1:1. Hydrogenhexasiloxane and hexadecylmethyldihydrooctasiloxane were mixed, Karstedt catalyst was added, the temperature was raised to 90°C under the protection of nitrogen, and the crude product was obtained after 4 hours of reaction. Then carry out rectification to remove unreacted raw materials, then add 10% activated carbon adsorption catalyst, stir at 70°C for 10 hours, then heat filter, remove activated carbon, and obtain pure fluorosiloxanes with different silicon contents. Phenylsiloxane obtained by reacting with octamethyldihydrotetrasiloxane, decamethyldihydropentasiloxane, dodecamethyldihydrohexasiloxane, hexadecylmethyldihydrooctasiloxane The alkane products are respectively marked as E, F, G, ...

Embodiment 1

[0046] in a glove box filled with argon (H 2 0<10ppm) to prepare 4 parts of electrolytic solution as described in Comparative Example 1, then add phenylsiloxane A, B, C, D to 4 parts of electrolytic solution respectively with a mass fraction of 1%, to obtain Electrolyte solutions 2A, 2B, 2C, 2D.

[0047] The prepared electrolytes 2A, 2B, 2C, and 2D were tested for SET and conductivity respectively, and the results are shown in Table 1; then 2A, 2B, 2C, and 2D were respectively injected into lithium cobaltate graphite batteries for normal temperature charge-discharge cycle test, The test results are shown in Table 2.

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Abstract

The invention discloses an organo-siloxane flame retardant as well as a preparation method and an application thereof and further discloses a lithium-ion battery electrolyte with high flame retardance. The lithium-ion battery electrolyte obtained by addition of the organo-siloxane flame retardant not only has good flame retardant property, but also has the self-extinguishing characteristic and ishigher in electric conductivity, and charge-discharge cycle performance of the assembled lithium-ion battery is also improved.

Description

Technical field [0001] The invention relates to an organosiloxane flame retardant, specifically to an organosiloxane flame retardant that can be used in flame-retardant lithium-ion battery electrolyte, and belongs to the technical field of electrochemistry. Background technique [0002] Lithium-ion batteries have the advantages of high open circuit voltage, large specific capacity, small self-discharge, long cycle life, good safety performance, no memory effect, and no pollution. They are widely used in various types of electronic equipment and have achieved tremendous development in the past decade. One of the new energy sources. However, currently, lithium-ion battery electrolytes are generally based on carbonate organic solvents dissolved with lithium salts. This type of solvent has the disadvantages of low flash point and flammability. It is easy to catch fire when the battery releases a large amount of heat or is short-circuited. , burn or even explode, affecting the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/08C08G77/24C08G77/06C08G77/20C08G77/18H01M10/0567H01M10/0525
CPCC07F7/0889C08G77/045H01M10/0525H01M10/0567Y02E60/10
Inventor 王夏君黄强罗代宇王有治
Owner CHENGDU GUIBAO SCI & TECH
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