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Incombustible high voltage electrolyte and preparation method and application thereof

An electrolyte and high-voltage technology, which is applied in the manufacture of electrolyte batteries, sustainable manufacturing/processing, and non-aqueous electrolyte batteries. High flash point, good stability effect

Active Publication Date: 2019-05-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problems of flammability and the need to increase the working voltage of the current lithium-ion batteries, it is necessary to develop a high-voltage non-flammable electrolyte

Method used

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  • Incombustible high voltage electrolyte and preparation method and application thereof
  • Incombustible high voltage electrolyte and preparation method and application thereof
  • Incombustible high voltage electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) fluorocarbonate is dehydrated with 4A molecular sieve;

[0049] (2) dissolving monofluoroethylene carbonate and bis-(2,2,2)-trifluoroethyl carbonate at a volume ratio of 3:7 to obtain solvent A;

[0050] (3) Finally, add a certain mass of lithium hexafluorophosphate to the solvent A in step (2) to make the solution concentration reach 1 mol / L, and stir for 12 hours to obtain a non-flammable high-voltage resistant electrolyte.

Embodiment 2

[0052] (1) fluorocarbonate is dewatered with 4A molecular sieve and gac;

[0053] (2) dissolving difluoroethylene carbonate and bis-(2,2,2)-trifluoroethyl carbonate at a ratio of 5:5 by volume to obtain solvent A;

[0054] (3) Finally, add a certain mass of lithium bis(fluorosulfonyl)imide to the solvent A in step (2) to make the solution concentration reach 2mol / L, and stir for 12 hours to obtain a non-flammable high-voltage resistant electrolyte.

Embodiment 3

[0056] (1) fluorocarbonate is dehydrated with 4A molecular sieve and calcium hydride;

[0057] (2) dissolving trifluoroethylene carbonate and 3,3,3-trifluoromethyl methyl carbonate in a volume ratio of 4:6 to obtain solvent A;

[0058] (3) Finally, add a certain mass of lithium bis(trifluoromethanesulfonyl)imide to the solvent A in step (2) to make the solution concentration reach 1.5 mol / L, and stir for 10 hours to obtain a non-flammable high-voltage resistant electrolyte.

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Abstract

The invention provides an incombustible high-voltage lithium ion battery electrolyte and a preparation method and application thereof. The electrolyte is composed of an electrolyte organic solvent anda lithium salt; the electrolyte organic solvent is composed of two or more fluorocarbonates including an annular fluorocarbonate shown by a formula (I) and a chain fluorocarbonate shown by a formula(II) at least; in the formula (I), R1, R2, R3 and R4 are independently selected from H, F, C1-10 fluorine contained alkyl and C1-C10 fluorine contained alkyloxy, and cannot be H at the same time; andin the formula (II), R5 and R6 are independently selected from C1-10 alkyl, F and C1-10 fluorine contained alkyl, and cannot be C1-10 alkyl at the same time. The electrolyte has the advantages of incombustibility, high withstanding voltage, and capable of improving the circulation and power multiplication performances of the battery.

Description

technical field [0001] The invention relates to the field of battery industry, in particular to a non-flammable high-voltage electrolyte and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Environmental pollution and energy crisis have led to the rapid development of green energy technology. Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and low environmental pollution. They are widely used in mobile phones, digital cameras, notebook computers and other small Among portable devices, currently used as the power source of new energy vehicles and large-scale energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/058H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 冯金奎曾桂芳
Owner SHANDONG UNIV
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