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A kind of electrolyte solution for lithium battery and preparation method thereof

An electrolyte and lithium battery technology, applied in the field of lithium battery electrolyte and its preparation, can solve the problems of high flammability and poor low temperature performance, and achieve the effects of excellent low temperature performance, large electrochemical window and low melting point

Active Publication Date: 2021-10-19
常州创标新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high flammability and poor low-temperature performance of existing lithium-ion battery electrolyte systems are major challenges for large-scale applications (e.g., electric vehicles)

Method used

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  • A kind of electrolyte solution for lithium battery and preparation method thereof
  • A kind of electrolyte solution for lithium battery and preparation method thereof
  • A kind of electrolyte solution for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Under the Dean-Stark device, boric acid and 2-dimethylaminoethanol were dissolved in 150ml toluene at a molar ratio of 1:3.2 and placed in a 250ml round bottom flask, and heated under reflux one day. All volatiles were removed from the resulting liquid in a rotary evaporator and high vacuum distillation. A pure transparent organic liquid based on a borate aminoether ligand symmetrical star organic solvent was obtained after passing through an alumina column. Yield 97%.

[0022] (2) 1 g of lithium bistrifluoromethanesulfonimide (LiTFSI) was dissolved in 2.5 g of the above product (boron compound) solvent to prepare a liquid electrolyte solution.

[0023] A polypropylene separator is immersed in an electrolyte solution, and the soaked separator can be used as a liquid electrolyte.

[0024] The freezing point of the pure boron compound solvent is -80.9°C, and the freezing point of the electrolyte is -84.0°C.

[0025] The ion conductivity can reach 0.43mS / cm at 25°C...

Embodiment 2

[0028] (1) Under the Dean-Stark apparatus, boric acid and 2-dimethylaminoethanol were dissolved in 100ml xylene in a molar ratio of 1:3.2 and placed in a 250ml round bottom flask, and under reflux Heat for a day. All volatiles were removed from the resulting liquid in a rotary evaporator and high vacuum distillation. A pure transparent organic liquid based on a borate aminoether ligand symmetrical star organic solvent was obtained after passing through an alumina column. Yield 97%.

[0029] (2) 1 g of lithium bistrifluoromethanesulfonimide (LiTFSI) was dissolved in 2.9 g of the above product (boron compound) solvent to prepare a liquid electrolyte solution.

[0030] A polypropylene separator is immersed in an electrolyte solution, and the soaked separator can be used as a liquid electrolyte.

[0031] The freezing point of the pure boron compound solvent is -80.9°C, and the freezing point of the electrolyte is -84.0°C.

[0032] The ion conductivity can reach 0.72mS / cm at 25...

Embodiment 3

[0035] (1) Under the Dean-Stark apparatus, boric acid and 2-dimethylaminoethanol were dissolved in 170ml toluene with a molar ratio of 1:3.2 and placed in a 250ml round bottom flask, and heated under reflux one day. All volatiles were removed from the resulting liquid in a rotary evaporator and high vacuum distillation. A pure transparent organic liquid based on a borate aminoether ligand symmetrical star organic solvent was obtained after passing through an alumina column. Yield 97%.

[0036] (2) 1 g of lithium bistrifluoromethanesulfonimide (LiTFSI) was dissolved in 3.5 g of the above product (boron compound) solvent to prepare a liquid electrolyte solution.

[0037] A polypropylene separator is immersed in an electrolyte solution, and the soaked separator can be used as a liquid electrolyte.

[0038] The freezing point of the pure boron compound solvent is -80.9°C, and the freezing point of the electrolyte is -83.2°C.

[0039] The ion conductivity can reach 1.18mS / cm at...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to an electrolyte solution for lithium batteries and a preparation method thereof. First, boric acid and 2-dimethylaminoethanol are dissolved in a solvent to prepare a symmetric electrolyte based on borate aminoether ligands. The star-shaped organic solvent is then used to replace the existing lithium battery ethylene carbonate / dimethyl carbonate mixed solvent for the preparation of lithium battery electrolyte. The obtained electrolyte has a low melting point, is not volatile, is chemically stable, and has a large electrochemical window.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to an electrolyte solution for lithium batteries and a preparation method thereof. Background technique [0002] With the increasing demand for creating new clean and sustainable energy sources to replace traditional fossil fuels, lithium-ion batteries have attracted much attention as one of the most promising energy storage devices. A lithium battery usually consists of a positive electrode, a negative electrode and an electrolyte. Among them, the positive electrode contains lithium cobalt oxide and many additives, and these substances are coated on aluminum foil to produce a chemical reaction of charge and discharge; the negative electrode is nano-scale carbon powder such as graphite, and these substances are used by coating on copper foil. The electrolyte in the electrolyte usually includes lithium perchlorate, lithium hexafluorophosphate, etc., but the battery made of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0028Y02E60/10
Inventor 马强梅新艺岳峥常鑫焱唐志伟周胜学
Owner 常州创标新能源科技有限公司
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