Fluorine-containing 5.5 V high-voltage lithium ion battery electrolyte and application thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor oxidation stability of electrolytes

Pending Publication Date: 2021-07-13
CHINA UNIV OF PETROLEUM (BEIJING)
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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 overcome the problem of poor oxidation stability of lithium ion battery electrolyte under high pressure in the prior art

Method used

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  • Fluorine-containing 5.5 V high-voltage lithium ion battery electrolyte and application thereof
  • Fluorine-containing 5.5 V high-voltage lithium ion battery electrolyte and application thereof
  • Fluorine-containing 5.5 V high-voltage lithium ion battery electrolyte and application thereof

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preparation example Construction

[0041] The present invention has no particular limitation on the preparation method of the lithium-ion battery, and the lithium-ion battery can be prepared by a conventional method in the art. Exemplarily, the lithium-ion battery of the present invention can be prepared by the preparation method provided in WO2017128989A1. The present invention The following exemplarily provides a method for preparing a lithium ion battery, which should not be understood by those skilled in the art as limiting the present invention.

[0042] Preferably, the lithium ion battery further includes a separator.

[0043] More preferably, the separator is at least one selected from polypropylene separators.

[0044] According to a particularly preferred embodiment, said membrane is Celgarde 2400.

[0045] Compared with the prior art, the present invention has the advantages of:

[0046] (1) The present invention prevents the electrolytic solution from being oxidized in a large amount at a higher wo...

Embodiment 1

[0062] The present embodiment provides a kind of method for preparing lithium-ion battery electrolyte, and this method comprises:

[0063] (1) In a glove box filled with argon (water content and oxygen content are both less than 0.01ppm), fluoroethylene carbonate, propylene carbonate and dimethyl carbonate are mixed uniformly according to the volume ratio of 2:2:6, Obtain the first mixed solution;

[0064] (2) adding lithium hexafluorophosphate to the first mixed solution obtained above to obtain a solution in which the concentration of lithium hexafluorophosphate is 1mol / L;

[0065] (3) adding lithium difluorooxalate borate to the aforementioned lithium hexafluorophosphate solution to obtain lithium ion battery electrolyte S1; wherein, in lithium ion battery electrolyte S1, difluorooxalate lithium borate accounts for 5% of the total weight of the electrolyte, The total weight of fluoroethylene carbonate, propylene carbonate and dimethyl carbonate accounts for 84% of the tota...

Embodiment 2

[0067] The present embodiment provides a kind of method for preparing lithium-ion battery electrolyte, and this method comprises:

[0068] (1) In a glove box filled with argon (water content and oxygen content are both less than 0.01ppm), fluoroethylene carbonate, propylene carbonate and dimethyl carbonate are mixed uniformly according to the volume ratio of 2:2:6, Obtain the first mixed solution;

[0069] (2) adding lithium hexafluorophosphate to the first mixed solution obtained above to obtain a solution in which the concentration of lithium hexafluorophosphate is 1mol / L;

[0070] (3) adding lithium difluorooxalate borate to the lithium hexafluorophosphate solution obtained above to obtain lithium ion battery electrolyte S2; wherein, in lithium ion battery electrolyte S2, lithium difluorooxalate borate accounts for 1% of the total weight of the electrolyte, The total weight of fluoroethylene carbonate, propylene carbonate and dimethyl carbonate accounts for 88% of the tota...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a fluorine-containing 5.5 V high-voltage lithium ion battery electrolyte and application thereof. The electrolyte contains a lithium salt, an organic solvent and an additive which are stored independently or stored in a mixed mode of two or more of the lithium salt, the organic solvent and the additive. Based on the total weight of the electrolyte, the electrolyte contains 4-15% of a lithium salt, 80-95% of an organic solvent and 1-5% of an additive; the organic solvent contains fluoroethylene carbonate, propylene carbonate and dimethyl carbonate in a volume ratio of 1: (1-5): (1-8); and the additive is lithium difluoro (oxalato) borate. According to the invention, fluoroethylene carbonate, propylene carbonate and dimethyl carbonate in a specific ratio are used as organic solvents, and are matched with the lithium salt and the additive lithium difluoro (oxalato) borate, so that the electrolyte which still has relatively high oxidation stability under high pressure can be formed.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a fluorine-containing 5.5V high-voltage lithium-ion battery electrolyte and an application thereof. Background technique [0002] As a new type of green rechargeable battery, lithium-ion battery has the advantages of high energy density, high output voltage, long cycle life, and less environmental pollution. It is the first choice for portable electronic products such as mobile phones, notebook computers, digital cameras and other equipment batteries. It is widely used in power tools and hybrid / full electric vehicles. However, the energy density of existing lithium-ion battery systems cannot fully meet the development requirements of modern power equipment. Therefore, high-voltage lithium-ion batteries are one of the main development directions of high-energy density and high-power density lithium-ion batteries. [0003] In recent years, new high-voltage cathode m...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0563H01M10/4235Y02E60/10
Inventor 黄国勇董曦
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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