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High-power and high-voltage-resistant lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, which is used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolytes, etc. Effects of Cyclic Stability

Inactive Publication Date: 2020-04-28
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conductivity of the conventional carbonate and lithium hexafluorophosphate system electrolyte is about 10mS / cm, the rate performance is average, and it will decompose rapidly when the voltage exceeds 4.5V, and the battery performance will drop sharply. Therefore, it is suitable for high-power and high-voltage electrolysis Liquid needs are particularly urgent

Method used

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

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preparation example Construction

[0027] The invention discloses a method for preparing a high-voltage lithium-ion battery electrolyte, comprising the following steps:

[0028] In an inert environment full of argon, ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate were respectively added to a container to form a mixed non-aqueous organic solvent; then lithium hexafluorophosphate was dissolved in the mixed non-aqueous organic solvent, and then Add film-forming functional additives vinylene carbonate and difluoroethylene carbonate to prepare an electrolyte solution, and finally seal the prepared electrolyte solution and store it for 24 hours.

Embodiment 1

[0031] In an inert environment filled with argon, ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate were added to the container at a volume ratio of 4:2:1 to form a mixed non-aqueous organic solvent, and then lithium hexafluorophosphate was dissolved in In the mixed non-aqueous organic solvent, then add film-forming functional additives vinylene carbonate and difluoroethylene carbonate at a mass ratio of 1:10 to prepare an electrolyte solution containing 1.1M lithium hexafluorophosphate, wherein the mass percentage of each raw material is composed of : Non-aqueous organic solvent accounts for 84%, lithium salt accounts for 14%, and film-forming functional additive accounts for 2%. Finally, the prepared electrolyte is sealed and stored for 24 hours. The electrical conductivity of the obtained electrolytic solution was 9.5 mS / cm.

[0032] Prepare the positive pole of high-voltage lithium cobaltate, the negative pole of graphite + hard carbon, and a test soft-pac...

Embodiment 2

[0035] In an inert environment filled with argon, ethylene carbonate, ethyl methyl carbonate, and dimethyl carbonate were added to the container at a volume ratio of 6:3:2 to form a mixed non-aqueous organic solvent, and then lithium hexafluorophosphate was dissolved in In the mixed non-aqueous organic solvent, then add film-forming functional additives vinylene carbonate and difluoroethylene carbonate in a mass ratio of 3:20 to prepare an electrolyte containing 1.2M lithium hexafluorophosphate, wherein the mass percentage of each raw material is composed of : Non-aqueous organic solvent accounts for 80%, lithium salt accounts for 16%, and film-forming functional additive accounts for 4%. Finally, the prepared electrolyte solution is sealed and stored for 24 hours. The electrical conductivity of the obtained electrolytic solution was 10.1 mS / cm.

[0036] Prepare the positive pole of high-voltage lithium cobalt oxide, the negative pole of graphite + hard carbon, and a test soft...

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Abstract

The invention belongs to the technical field of lithium ion battery electrolytes, and particularly relates to high-power and high-voltage-resistant lithium ion battery electrolyte and a preparation method thereof. The electrolyte is prepared from the following raw materials in percentage by mass: 77%-84% of a non-aqueous organic solvent, 14%-18% of lithium salt and 2%-5% of a film-forming functional additive, wherein the non-aqueous organic solvent comprises ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate; the lithium salt is lithium hexafluorophosphate; the molar concentration of lithium hexafluorophosphate is 1.1-1.3M; and the film-forming functional additive comprises vinylene carbonate and difluoroethylene carbonate. In the environment of an inert gas, the electrolyteis prepared. By adopting the non-aqueous organic solvent, the lithium salt and the film-forming functional additive in a proper proportion, the electrolyte has relatively high voltage tolerance, relatively good charging and discharging performance and good cycling stability, and the battery containing the electrolyte can have good electrochemical performance under high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and in particular relates to a high-power and high-voltage-resistant lithium-ion battery electrolyte and a preparation method thereof. Background technique [0002] Compared with traditional lead-acid batteries, nickel-cadmium batteries and other systems, lithium-ion batteries have the advantages of high voltage, high energy density, good cycle stability, and no memory effect. They have developed rapidly in recent years, and their applications have also been extended to electronic products, Transportation and energy storage devices and other fields. With the continuous improvement of power supply performance requirements on the application side, the requirements for the energy density and power density of lithium-ion batteries are also increasing day by day, which puts forward higher and higher requirements for lithium-ion battery electrolytes: in addition to being able to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/058
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/058H01M2300/0091H01M2300/004Y02E60/10Y02P70/50
Inventor 刘逸骏丁飞刘兴江宗军宁凡雨刘胜男
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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