Composite, preparation method and application thereof in lithium battery electrolyte

A compound and electrolyte technology, applied in the application, preparation and compound field of lithium battery electrolyte, can solve the problems of poor temperature tolerance, poor voltage resistance, flammability and explosion, and achieve high flash point, Good voltage resistance and high safety performance

Inactive Publication Date: 2018-12-14
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a compound, a preparation method and its application in lithium battery electrolyte, which are used to solve the problems in the prior art that lithium ion batteries have poor withstand voltage performance, poor temperature tolerance, Flammable and explosive technical defects

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  • Composite, preparation method and application thereof in lithium battery electrolyte

Examples

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Embodiment 1

[0025] This example is a specific example of preparing the electrolyte product 1.

[0026] In this example, the ether-functionalized pyrrolidine ionic liquid 1 is 1-methyl-1-ethyl ether pyrrolidine bis(trifluoromethylsulfonyl)imide salt, and the anion 1 is bis(trifluoromethyl Sulfonyl) imide anion, cation 1 is 1-methyl-1-ethyl ether pyrrolidine cation. Among them, the preparation method of ether-functionalized pyrrolidine ionic liquid 1 is as follows: 4 g of 1-methylpyrrolidine and 7.5 g of bromoethyl ethyl ether are weighed, dissolved in acetonitrile, heated in an oil bath, and the reaction does not exceed 24 hours. After the reaction, the acetonitrile was spun off to obtain 1-methyl-1-ethyl ether pyrrolidine bromide. Then 1-methyl-1-ethyl ether pyrrolidinium bromide and LiTFSI were dissolved in 40mL ultrapure water at a molar ratio of 1:1.1, stirred at room temperature for 4h, and the ionic liquid phase and the aqueous phase were separated, and the ionic liquid phase was se...

Embodiment 2

[0029] This example is a specific example of preparing the electrolyte product 2.

[0030] In this example, the ether-functionalized pyrrolidine ionic liquid 2 is 1-methyl-1-ethyl ether pyrrolidine tetrafluoroborate, the anion 2 is tetrafluoroborate anion, and the cation 2 is 1-methyl- 1-Ethyl ether pyrrolidine cation. Among them, the preparation method of the ether-functionalized pyrrolidine ionic liquid 2 is as follows: 3 g of 1-methylpyrrolidine and 5.5 g of bromoethyl ethyl ether are weighed, dissolved in acetonitrile, heated in an oil bath, and the reaction does not exceed 24 hours. After the reaction, the acetonitrile was spun off to obtain 1-methyl-1-ethyl ether pyrrolidine bromide. Then 1-methyl-1-ethyl ether pyrrolidine bromide and LiBF 4 Dissolve in 40mL ultrapure water at a molar ratio of 1:1.1, stir at room temperature for 4h, separate the ionic liquid phase and the water phase, wash the ionic liquid phase with ultrapure water five times, add ethyl acetate, then ...

Embodiment 3

[0033] This example is a specific example of preparing the electrolyte product 3 .

[0034] In this embodiment, the ether-functionalized pyrrolidine ionic liquid 3 is 1-methyl-1-ethyl ether pyrrolidine bis(fluorosulfonimide) salt, and the anion 3 is bis(fluorosulfonimide) ) anion, and cation 3 is 1-methyl-1-ethyl ether pyrrolidine cation. Among them, the preparation method of ether-functionalized pyrrolidine ionic liquid 3 is as follows: weigh 6 g of 1-methylpyrrolidine and 11 g of bromoethyl ethyl ether, dissolve in acetonitrile, heat in an oil bath, and react for no more than 24 hours. After the reaction, the acetonitrile was spun off to obtain 1-methyl-1-ethyl ether pyrrolidine bromide. Then 1-methyl-1-ethyl ether pyrrolidinium bromide and LiFSI were dissolved in 40mL ultrapure water at a molar ratio of 1:1.1, stirred at room temperature for 4h, and the ionic liquid phase and the aqueous phase were separated, and the ionic liquid phase was separated into Wash five times w...

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Abstract

The invention belongs to the field of chemical power supplies, in particular to a composite, a preparation method and an application thereof in a lithium battery electrolyte. The invention provides acomposite, which includes an electrolyte lithium salt, an ether-based functionalized pyrrolidine ionic liquid and a non-aqueous organic solvent; the ether-based functionalized pyrrolidine ionic liquidis composed of cations and anions, and the cations are ether-based functionalized pyrrolidine cations. The invention also provides a preparation method of the composite and an application of the composite or a product obtained by the preparation method in a lithium battery electrolyte. In the invention, the composite is non-flammable and has high safety performance; at the same time, it is determined by experiments that the composite has good withstand voltage performance; and the composite solves the technical defects of poor withstand voltage performance, poor temperature tolerance, flammability and explosiveness of lithium ion batteries in the prior art.

Description

technical field [0001] The invention belongs to the field of chemical batteries, and in particular relates to a compound, a preparation method and its application in lithium battery electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy and specific power, small self-discharge, no memory effect, good cycle stability and environmental protection, and are widely used in battery markets such as mobile electronic devices, electric vehicles, and energy storage power stations. , and is gradually occupying a dominant position in the energy storage power supply market. With the rapid development of electric vehicles and the demand for energy storage, higher requirements are placed on the safety and energy density of lithium-ion batteries. [0003] However, there are also a series of problems in the use of lithium batteries. For example, when the charging voltage exceeds 4.5V, the battery will seriously dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 刘全兵张圣洁李俊豪杨伟方岩雄郑育英
Owner GUANGDONG UNIV OF TECH
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