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High-voltage lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as affecting the safety of battery use, reducing battery life, and increasing battery internal pressure, achieving excellent charge and discharge performance, reducing oxidative decomposition, and improving cycle. premiere effect

Inactive Publication Date: 2020-06-12
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional electrolyte is easy to oxidize and decompose under high voltage, and then a large amount of gas will be generated, which will increase the internal pressure of the battery and cause the battery to bulge, which will affect the safety of the battery and reduce the service life of the battery.

Method used

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  • High-voltage lithium ion battery electrolyte and preparation method thereof
  • High-voltage lithium ion battery electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) sequentially in a mass ratio of 1:1:1 in a nitrogen-filled glove box (moisture <10ppm, oxygen <1ppm) , when the temperature drops to 5°C, slowly add lithium salt under the condition that the temperature is not higher than 10°C, and prepare lithium hexafluorophosphate with a concentration of 1.2mol / L, lithium dioxalate borate with a concentration of 0.1mol / L, and bistrifluoromethylsulfonyl Lithium amine is 0.1mol / L electrolyte, keep stirring until the solution is clear, then add 5% fluoroethylene carbonate according to the total mass of the electrolyte, stir well, transfer to a bottle filled with inert gas for storage for later use.

Embodiment 2

[0033] Add dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) sequentially in a mass ratio of 1:1:1 in a nitrogen-filled glove box (moisture <10ppm, oxygen <1ppm) , when the temperature drops to 5°C, slowly add lithium salt under the condition that the temperature is not higher than 10°C, and prepare lithium hexafluorophosphate with a concentration of 1.2mol / L, lithium dioxalate borate with a concentration of 0.1mol / L, and bistrifluoromethylsulfonyl Lithium amine is 0.1mol / L electrolyte, keep stirring until the solution is clear, then add 5% fluoroethylene carbonate and 2% cyanosulfate according to the total mass of the electrolyte, stir well, transfer to a bottle filled with inert gas Store for later use.

Embodiment 3

[0035] Add dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) sequentially in a mass ratio of 1:1:1 in a nitrogen-filled glove box (moisture <10ppm, oxygen <1ppm) , when the temperature drops to 5°C, slowly add lithium salt under the condition that the temperature is not higher than 10°C, and prepare lithium hexafluorophosphate with a concentration of 1.2mol / L, lithium dioxalate borate with a concentration of 0.1mol / L, and bistrifluoromethylsulfonyl Lithium amine is 0.1mol / L electrolyte, keep stirring until the solution is clear, then add 5% fluoroethylene carbonate and 2% 3-fluoro-1,3-propane sultone according to the total mass of the electrolyte, and stir well , transferred to bottles filled with inert gas for storage.

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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly discloses a high-voltage lithium ion battery electrolyte and a preparation method thereof. The high-voltage lithium ion battery electrolyte is characterized by comprising an anhydrous organic solvent, a lithium salt and a functional additive. The functional additive is a mixture of cyanosulfate, fluoroethylenecarbonate and 3-fluoro-1, 3-propane sultone, the content of the functional additive is 5-15% of the total mass of the electrolyte, and the anhydrous organic solvent is linear carbonate and cyclic carbonate. Through combined use of various functional additives, the oxidation resistance of the SEI film during primary formation of the electrolyte is effectively improved, so that the cycle effect of the lithium ion battery under high voltage is remarkably improved, and meanwhile, the electrolyte has excellent charge-discharge performance and is suitable for wide popularization and application.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage lithium-ion battery electrolyte and a preparation method thereof. [0003] (2) Background technology [0004] Since lithium-ion batteries were successfully commercialized by Sony Corporation in 1991, they have rapidly occupied portable electronic devices such as mobile phones, notebook computers, and cameras with their advantages such as high energy density, high working voltage platform, no memory effect, and low self-discharge rate. field. With the rapid development of hybrid electric vehicles and pure electric vehicles, lithium-ion batteries, which are ideal power sources for power vehicles, are facing unprecedented opportunities and challenges. The development of lithium-ion batteries with higher energy density has become a research hotspot nowadays. The development of high-voltage cathode materials is one of the important ways to deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 孙建勇林红赵卫民赵志华刘永郭庆元
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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