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High-voltage additive as well as preparation method and application thereof

A high-voltage, additive technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as increasing electrode interface impedance, and achieve the effects of good water removal, excellent performance, and good high-voltage resistance performance.

Pending Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that high-voltage electrolyte additives cannot achieve good compatibility with the positive and negative interfaces at the same time, which increases the electrode interface impedance. Therefore, it is of great significance to develop high-voltage electrolyte additives with high compatibility and low impedance.

Method used

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  • High-voltage additive as well as preparation method and application thereof
  • High-voltage additive as well as preparation method and application thereof
  • High-voltage additive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of substance A, comprises the steps:

[0038] Dissolve 20g of 4-methylethylene carbonate (that is, substance 2) in 100ml of tetraethylene glycol dimethyl ether, control the temperature at 35°C, slowly add potassium fluoride and stir for 6 hours, take the reaction liquid and distill it under reduced pressure to obtain about 15g 4-trifluoromethylethylene carbonate (i.e. Substance 1);

[0039] Mix 30g of trimethylchlorosilane, 10g of 4-trifluoromethylethylene carbonate, and 10ml of tetrahydrofuran, and react under reflux at 60°C for 10h, take the reaction liquid and undergo rectification three times, and collect fractions with a rectification temperature of 180-200°C , which is substance A, and its purity reaches above 96.5%.

Embodiment 2

[0041] The preparation method of substance B: replace 4-methyl ethylene carbonate with 4-ethyl ethylene carbonate, collect the distillate with a rectification temperature of 200-220° C. to be substance B, and the others are the same as in Example 1.

Embodiment 3

[0043] The preparation method of substance C: replace 4-methyl ethylene carbonate with 4-propyl ethylene carbonate, collect the fraction with a rectification temperature of 190-230° C. to be substance C, and the others are the same as in Example 1.

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Abstract

The invention discloses a high-voltage additive, the structural formula of the additive is shown as the formula (I), R1, R2 and R3 are selected from alkyl, alkenyl, alkynyl, halogen, halogenated alkyl, halogenated alkylene, halogenated alkylene or halogenated aryl, wherein halogenation is partial substitution or complete substitution, groups of R1, R2 and R3 are the same or different, and the halogen is fluorine, chlorine or bromine. The invention also discloses a high-voltage electrolyte which comprises the following raw materials: conductive lithium salt, an organic solvent and the high-voltage additive. The invention also discloses the high-voltage additive and the application of high-voltage electrolyte in a lithium-ion battery. According to the invention, a compact and stable interface film can be formed on the surface of a negative electrode material, effective film formation and adsorption can be performed on the surface of the positive electrode material, and the oxidation-reduction decomposition of the electrolyte in a high-voltage battery system is effectively inhibited; and the high-voltage additive is beneficial to improving the high-voltage electrochemical performanceof the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage additive and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used because of their high working voltage, large specific energy, long cycle life and no memory effect. For example, lithium-ion batteries have been widely used in the field of 3C consumer electronics products, and with the new With the development of energy vehicles, lithium-ion batteries are also widely used in the field of power and energy storage. [0003] The traditional lithium iron phosphate battery is very popular in the market because of its good safety performance and high cycle life. However, with people's demand for higher energy density of new battery energy, lithium iron phosphate batteries cannot further increase the energy density of batteries due to their own positive electrode materials with a limit gram capacity of 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 梁大宇俞金萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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