High voltage electrolyte solution and lithium ion battery containing the same

An electrolyte and high-voltage technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of rapid capacity loss and poor cycle performance of lithium-ion batteries, achieve excellent cycle performance, improve withstand voltage performance, and reduce hydrogen The effect of precipitation

Inactive Publication Date: 2015-04-08
NINGBO VEKEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage electrolyte that is conducive to improving the high-voltage performance of lithium-io

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The high-voltage electrolyte is prepared by the following steps: dissolve lithium hexafluorophosphate in vinylene carbonate under the effect of a magnetic field, stir for 0.5h, add chloroethylene carbonate, octamethylcyclotetrasiloxane and hexamethyldisilazane , ultrasonic vibration at room temperature for 4 hours, finally adding vitamin E, and ultrasonic vibration for 3 hours at -4°C to obtain a high-voltage electrolyte; wherein, the concentration of electrolyte in the electrolyte is 1.7mol / L, the frequency of ultrasonic vibration is 45Hz, and the strength of the magnetic field It is 2100GS, based on the total weight of the electrolyte, the amount of additives added is: 5% hexamethyldisilazane, 0.5% octamethylcyclotetrasiloxane, 3% vitamin E and 0.3% chlorine Vinyl carbonate.

Embodiment 2

[0026] The high-voltage electrolyte is prepared by the following steps: dissolving lithium tetrafluoroborate in a mixed solution of γ-butyrolactone and dipropyl carbonate under the effect of a magnetic field, and the volume ratio of γ-butyrolactone to dipropyl carbonate is 2:1, stirring for 2h, adding chloroethylene carbonate, octamethylcyclotetrasiloxane and hexamethyldisilazane, ultrasonic vibration at room temperature for 5h, finally adding vitamin E, ultrasonic vibration at 0°C for 4h, Obtain a high-voltage electrolyte; wherein, the concentration of the electrolyte in the electrolyte is 2.12mol / L, the frequency of the ultrasonic vibration is 50Hz, and the strength of the magnetic field is 2600GS, based on the total weight of the electrolyte, the addition of the additive is: 5.5% of six Methyldisilazane, 2.4% octamethylcyclotetrasiloxane, 4.1% vitamin E and 5% chloroethylene carbonate.

Embodiment 3

[0028] The high-voltage electrolyte is prepared by the following steps: LiAsF 6 Dissolve in diethyl carbonate under the effect of a magnetic field, stir for 3 hours, add chloroethylene carbonate, octamethylcyclotetrasiloxane and hexamethyldisilazane, ultrasonically vibrate for 6 hours at room temperature, and finally add vitamin E, in Ultrasonic vibration at 5°C for 4.5 hours to obtain a high-voltage electrolyte; wherein, the concentration of electrolyte in the electrolyte is 2.35mol / L, the frequency of ultrasonic vibration is 55Hz, and the strength of the magnetic field is 3200GS. Based on the total weight of the electrolyte, the amount of additives The addition amount is: 6.5% of hexamethyldisilazane, 3.5% of octamethylcyclotetrasiloxane, 5.2% of vitamin E and 10% of chloroethylene carbonate.

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Abstract

The invention relates to a high voltage electrolyte solution and a lithium ion battery containing the same. The high voltage electrolyte solution contains a lithium salt and a non-aqueous organic solvent. The high voltage electrolyte solution also includes an additive, which is composed of hexamethyldisilazane, octamethylcyclotetrasiloxane, vitamin E and chloroethylene carbonate. By adding a chlorinated solvent into the lithium ion battery electrolyte solution, the voltage withstanding performance of the electrolyte solution can be greatly improved, and the electrolyte solution is not easy to decompose under high voltage. The octamethylcyclotetrasiloxane can effectively remove corrosive substances dissociating to an anode surface and in an electrolyte solution system. Adding of the hexamethyldisilazane to a lead electrode surface able to adsorb in a charge-discharge process is equivalent to improve the evolution potential of hydrogen, and can reduce hydrogen evolution. The lithium ion battery has high capacity retention rate and high capacity recovery rate under a high temperature storage condition, and has excellent cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage electrolyte for improving the high-voltage performance of the lithium-ion battery and a lithium-ion battery containing the electrolyte. Background technique [0002] Due to the advantages of high energy density, high working voltage, long cycle life, high power, and environmental friendliness, lithium-ion batteries have become a hot research topic in the field of new energy. With the rapid development of lithium-ion batteries and the demand for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion batteries with high safety, high capacity, high power, long life and environmental protection. Lithium-ion batteries have the advantages of high working voltage, high specific capacity, long cycle life, low price and environmental friendliness, and gradually occupy a dominant position in the lithium-ion battery marke...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 颜雪冬曹长河潘美姿马兴立刘旭
Owner NINGBO VEKEN BATTERY
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