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A kind of electrolyte flame retardant additive and lithium ion battery electrolyte containing the additive

A flame retardant additive, lithium-ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of reducing the solvent solubility, reducing the conductivity of the electrolyte, reducing the DN value of the solvent, etc. Beneficial to battery safety, improving electrochemical and thermodynamic stability, and improving flame retardancy

Active Publication Date: 2022-05-24
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although organophosphorus flame retardant additives have good flame retardant properties and good oxidation stability, they have a high reduction potential, are incompatible with graphite negative electrodes, and have high viscosity, which leads to a decrease in the conductivity of the electrolyte and a change in low temperature performance. Poor; fluorocarbonate flame retardant additives will reduce the solubility of lithium salts, and after the solvent is fluorinated, the DN value of the solvent will be reduced, and the solvent’s ability to dissolve lithium salts will be reduced

Method used

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  • A kind of electrolyte flame retardant additive and lithium ion battery electrolyte containing the additive
  • A kind of electrolyte flame retardant additive and lithium ion battery electrolyte containing the additive
  • A kind of electrolyte flame retardant additive and lithium ion battery electrolyte containing the additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Under nitrogen airtight protective atmosphere, moisture <10ppm, take the solvent ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a mass ratio of 1:1:1 and then add and mix them, using a condenser Cool the mixed solution to ensure that the temperature is not higher than 10°C, slowly add lithium hexafluorophosphate to ensure that the lithium salt concentration is 1.2mol / L, and then add film-forming additives with a mass fraction of 1% vinylene carbonate (VC) and fluoroethylene carbonate respectively. ester (FEC), and finally add 0.5% bis(trimethylsiloxy) cyclobutene flame retardant additive in mass fraction and continue stirring until the solution becomes clear.

Embodiment 2

[0046] The difference from Example 1 is that the amount of the flame retardant additive is different, and the flame retardant additive is added with a mass fraction of 1% bis(trimethylsiloxy)cyclobutene and continues to stir until the solution becomes clear.

Embodiment 3

[0048] The difference from Example 1 was that the amount of the flame retardant additive was different, and the flame retardant additive was added with a mass fraction of 1.5% bis(trimethylsiloxy)cyclobutene and continued stirring until the solution became clear.

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Abstract

The invention provides an electrolyte flame retardant additive and a lithium ion battery electrolyte containing the additive. The electrolyte flame retardant additive is a siloxycyclobutene additive, and the corresponding silanes and corresponding chain esters are used as The raw materials are obtained through silylation reaction under certain conditions. The structural formula of siloxycyclobutene additives is: [Chemical formula 1] Lithium-ion battery electrolyte, including solute lithium salt, anhydrous organic solvent, film-forming additive and electrolyte Flame retardant additive, the electrolyte flame retardant additive accounts for 0.5%-4% of the total mass fraction of the lithium-ion battery electrolyte. Through the technical scheme of the invention, the flame-retardant performance of the electrolyte is improved, the electrochemical and thermodynamic stability of the lithium battery are improved, and the safety of the lithium battery is further improved.

Description

technical field [0001] The present invention relates to the technical field of battery electrolytes, in particular to a flame retardant additive for electrolytes and a lithium-ion battery electrolyte containing the additives. Background technique [0002] Lithium-ion battery safety accidents are mainly caused by the reaction between the electrode and the electrolyte. The electrolyte contains organic solvents, which are extremely flammable substances. In the case of abuse (extrusion and puncture of the battery caused by mechanical abuse, overshoot and over-discharge of the battery caused by electrical abuse, overheating of the battery caused by thermal abuse, etc.), the stability of the positive electrode material is poor, it is easy to release oxygen, organic The solvent easily reacts with oxygen to release a lot of heat and gas, and the heat generated will further aggravate the decomposition of the positive electrode, resulting in a vicious circle; when the temperature rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 孙建勇陈新赵卫民项宏发林红刘永王彭丽郭庆元
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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