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Preparation method of gel electrolyte and application thereof in field of lithium ion batteries

A gel electrolyte, ionic liquid technology, applied in the field of lithium-ion batteries and chemical power sources, can solve the problems of poor temperature tolerance, low safety performance, flammable and explosive safety performance, etc., and achieve high electrical conductivity, charge-discharge specific capacity, etc. high effect

Inactive Publication Date: 2018-11-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the electrolyte components of commercial lithium-ion batteries are mostly organic solvents. This type of electrolyte has the disadvantages of poor temperature tolerance, flammability and low safety performance, and has certain limitations in application.
[0004] Therefore, a preparation method of a gel electrolyte and its application in the field of lithium-ion batteries have been developed to solve the technical defects of poor temperature tolerance and low safety performance in commercial lithium-ion battery electrolytes in the prior art, and become Problems to be solved urgently by those skilled in the art

Method used

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  • Preparation method of gel electrolyte and application thereof in field of lithium ion batteries
  • Preparation method of gel electrolyte and application thereof in field of lithium ion batteries

Examples

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Effect test

Embodiment 1

[0025] This example is a specific example of preparing the gel electrolyte 1 using the above composition.

[0026] 0.5g of ionic liquid polymer-polypyrrolidine bistrifluoromethanesulfonimide and 0.02g of filler 1 were dissolved in 8mL of solvent 1, coated on a glass plate, and dried in vacuum after the solvent evaporated to obtain a translucent porous The film, after cutting it into discs with a diameter of 16 mm, is the product A1. Among them, the inorganic filler 1 is SBA-15, the solvent 1 is acetone; the temperature of vacuum drying is 95°C.

[0027] In the glove box, dissolve 0.2g LiTFSI in the ionic liquid monomer—N-methyl-N-butylpyrrolidine bistrifluoromethanesulfonimide salt, and mix well to obtain the product B1. Wherein, the preparation method of the ionic liquid monomer is as follows: 4 g of 1-methylpyrrolidine and 6 g of bromobutane are dissolved in acetonitrile, heated in an oil bath, and the reaction does not exceed 24 hours. After the reaction, the acetonitrile...

Embodiment 2

[0030] This example is a specific example of preparing the gel electrolyte 2 using the above composition.

[0031] 0.5g of ionic liquid polymer-polypyrrolidine bistrifluoromethanesulfonimide and 0.025g of filler 2 were dissolved in 8mL of solvent 2, coated on a glass plate, and dried in vacuum after the solvent evaporated to obtain a translucent porous The film, after cutting it into discs with a diameter of 16 mm, is the product A2. Among them, the inorganic filler 2 is LiAlO 2 , solvent 2 is N,N-dimethylformamide; the temperature of vacuum drying is 100°C.

[0032] In the glove box, dissolve 0.19g LiFSI in the ionic liquid monomer—N-methyl-N-butylpyrrolidine bistrifluoromethanesulfonimide salt, and mix well to obtain the product B2. Among them, the preparation method of the ionic liquid monomer is as follows: 5 g of 1-methylpyrrolidine and 8 g of bromobutane are dissolved in acetonitrile, heated in an oil bath, and the reaction does not exceed 24 hours. After the reaction...

Embodiment 3

[0035] This example is a specific example of preparing the gel electrolyte 3 using the above composition.

[0036] 0.5g of ionic liquid polymer-polypyrrolidine bistrifluoromethanesulfonimide and 0.025g of filler 3 were dissolved in 8mL of solvent 3, coated on a glass plate, and dried in vacuum after the solvent evaporated to obtain a translucent porous The film, after cutting it into discs with a diameter of 16 mm, is product A3. Among them, the inorganic filler 3 is Al 2 o 3 , solvent 3 is methanol; the temperature of vacuum drying is 120°C.

[0037] In the glove box, dissolve 0.1g LiFSI in the ionic liquid monomer—N-methyl-N-butylpyrrolidine bistrifluoromethanesulfonimide salt, and mix well to obtain the product B3. Among them, the preparation method of the ionic liquid monomer is as follows: 8 g of 1-methylpyrrolidine and 15 g of bromobutane are dissolved in acetonitrile, heated in an oil bath, and the reaction does not exceed 24 hours. After the reaction, the acetonitr...

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Abstract

The invention belongs to the technical field of chemical power sources, and particularly relates to a preparation method of a gel electrolyte and application thereof in the field of lithium ion batteries. The preparation method of the gel electrolyte comprises the following steps: step 1, mixing an ionic liquid polymer with a solvent mixture solution, applying the mixed liquid to the surface of aplate carrier, placing the plate carrier under normal temperature and normal pressure, and performing vacuum drying to obtain a product A after the solvent is evaporated; step 2, dissolving LiTFSI orLiFSI in an ionic liquid monomer, and mixing to obtain a product B; step 3, immersing the product A in the product B, and performing infiltration to obtain the gel electrolyte. According to the technical scheme provided by the invention, the obtained product is the high-performance and highly-safe gel electrolyte which is high in conductivity and does not cause segregation; when the gel electrolyte is applied to a battery, a charge and discharge experiment shows that the first charge-discharge specific capacity of the battery is high; at the same time, the preparation method provided by the invention is simple, and facilitates large-scale production.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a preparation method of a gel electrolyte and its application in the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy and specific power, small self-discharge, no memory effect, good cycle stability and environmental protection, and are widely used in battery markets such as mobile electronic devices, electric vehicles, and energy storage power stations. , and is gradually occupying a dominant position in the energy storage power supply market. With the rapid development of electric vehicles and the demand for energy storage, higher requirements are placed on the safety and energy density of lithium-ion batteries. [0003] At present, the electrolyte components of commercial lithium-ion batteries are mostly organic solvents. This type of electrolyte has...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 刘全兵张圣洁李俊豪杨伟方岩雄郑育英
Owner GUANGDONG UNIV OF TECH
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