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Graphene lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor cycle performance and rapid loss of lithium-ion battery capacity, and achieve the effects of improved voltage resistance, excellent cycle performance, and high capacity recovery rate

Inactive Publication Date: 2015-11-25
NINGBO POLYTECHNIC
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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 graphene lithium-ion battery electrolyte that is beneficial to improve the high-voltage performance of lithium-ion batteries in order to solve the defects of rapid capacity loss and poor cycle performance of existing lithium-ion batteries in high-temperature environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The graphene lithium-ion battery electrolyte is prepared by the following steps: dissolve lithium hexafluorophosphate in vinylene carbonate under the effect of a magnetic field, stir for 5 hours, add vitamin E, octamethylcyclotetrasiloxane and hexamethyldisilazane , ultrasonic vibration at room temperature for 5 hours, and finally adding graphene, the strength of the magnetic field increased to 3500GS, and ultrasonic vibration at -4°C for 3 hours to obtain graphene lithium-ion battery electrolyte; wherein, the concentration of electrolyte in the electrolyte is 1.7mol / L , the frequency of ultrasonic vibration is 45Hz, the strength of the magnetic field is 2100GS, based on the total weight of the electrolyte, the amount of additives added is: 5% hexamethyldisilazane, 0.5% octamethylcyclotetrasiloxane , 0.3% vitamin E and 4.5% graphene.

Embodiment 2

[0025] The graphene lithium-ion battery electrolyte is prepared by the following steps: dissolving lithium tetrafluoroborate in a mixture of γ-butyrolactone and dipropyl carbonate under the effect of a magnetic field, γ-butyrolactone and dipropyl carbonate The volume ratio is 2:1, stirring for 5.5h, adding vitamin E, octamethylcyclotetrasiloxane and hexamethyldisilazane, ultrasonic vibration at room temperature for 5.5h, and finally adding graphene, the strength of the magnetic field is increased to 3800GS, ultrasonic vibration at 0°C for 4 hours to obtain graphene lithium-ion battery electrolyte; wherein, the concentration of electrolyte in the electrolyte is 2.12mol / L, the frequency of ultrasonic vibration is 50Hz, and the strength of the magnetic field is 2600GS. Based on the weight, the additives are added in the following amounts: 5.5% of hexamethyldisilazane, 2.4% of octamethylcyclotetrasiloxane, 4.1% of vitamin E and 5% of graphene.

Embodiment 3

[0027] The graphene lithium-ion battery electrolyte is prepared by the following steps: LiAsF 6 Dissolve in diethyl carbonate under the effect of a magnetic field, stir for 6.5 hours, add vitamin E, octamethylcyclotetrasiloxane and hexamethyldisilazane, ultrasonically vibrate for 6 hours at room temperature, and finally add graphene, the strength of the magnetic field Increase to 4000GS, and ultrasonically vibrate at 5°C for 4.5h to obtain graphene lithium-ion battery electrolyte; wherein, the electrolyte concentration in the electrolyte is 2.35mol / L, the frequency of ultrasonic vibration is 55Hz, and the strength of the magnetic field is 3200GS, with Based on the total weight of the electrolyte, the additives are added in the following amounts: 6.5% hexamethyldisilazane, 3.5% octamethylcyclotetrasiloxane, 5.3% vitamin E and 8.5% graphene.

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Abstract

The invention relates to graphene lithium ion battery electrolyte, which comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is prepared from the following components: 5%-6.5% of hexamethyl disilazane, 0.5%-3.5% of octamethylcyclotetrasiloxane, 4.5%-8.5% of graphene and 0.3%-5.3% of vitamin E on the basis of total weight of the electrolyte. The graphene is added to the lithium ion battery electrolyte, so that the voltage resistance of the electrolyte can be greatly improved; the electrolyte is not easy to decompose at high pressure; corrosive substances in an electrolyte system and the corrosive substances dissociating on the surface of a positive electrode can be effectively removed by the octamethylcyclotetrasiloxane; a lead electrode surface is adsorbed in the charging and discharging process due to the addition of the hexamethyl disilazane; equivalently, the deposition potential of hydrogen is improved; precipitation of hydrogen can be reduced; the lithium ion battery is stored in a high-temperature state; the capacity retention ratio and the capacity recovery rate are high; and the cycle performance is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a graphene lithium ion battery electrolyte for improving the performance of graphene lithium ion in lithium ion batteries. 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 power batteries with high safety, high capacity, high power, long life and environmental protection. Lithium iron phosphate power battery has the advantages of high working voltage, high specific capacity, long cycle life, low price and environmental friendliness, and gradually occupies a dominant position in the lithium-ion power battery marke...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 张慧波
Owner NINGBO POLYTECHNIC
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