Ionic liquid polymer gel electrolyte for solid-state lithium battery, and preparation method

A technology of gel electrolyte and ionic liquid, which is applied in the field of electrochemical energy storage, can solve problems such as dendrite growth of metal lithium negative electrodes, and achieve good cycle performance and rate performance, and high room temperature ionic conductivity.

Inactive Publication Date: 2019-07-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of this application is to provide an ionic liquid polymer gel electrolyte for solid-state lithium batteries to solve the problem of dendrite growth in metal lithium negative electrodes

Method used

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  • Ionic liquid polymer gel electrolyte for solid-state lithium battery, and preparation method
  • Ionic liquid polymer gel electrolyte for solid-state lithium battery, and preparation method
  • Ionic liquid polymer gel electrolyte for solid-state lithium battery, and preparation method

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Effect test

Embodiment 1

[0030] A kind of ionic liquid polymer gel electrolyte for solid-state lithium battery, its preparation method is as follows:

[0031] (1) 1g of polyvinylidene fluoride-hexafluoropropylene copolymer and 1g of 1-methyl-3-ethylimidazole bis(trifluoromethylsulfonyl)imide were dissolved in 5mL of anhydrous acetone, after stirring evenly, Apply a uniform film on the aluminum foil with a film maker;

[0032] (2) drying the aluminum foil coated with the film in vacuum for 6 hours at 50° C., then cooling, and peeling off to obtain the desired ionic liquid polymer film;

[0033] (3) Soak the ionic liquid polymer film in the 1,3-dioxolane / ethylene glycol dimethyl ether mixed solution of 1M bis(trifluoromethanesulfonate)imide lithium for 24 hours, after taking it out, use The excessive solvent is removed by filter paper, and the ionic liquid polymer gel electrolyte is obtained.

Embodiment 2

[0035] A kind of ionic liquid polymer gel electrolyte for solid-state lithium battery, its preparation method is as follows:

[0036] (1) Dissolve 1g of polyvinylidene fluoride-hexafluoropropylene copolymer and 0.25g of 1-methyl-3-ethylimidazole bis(trifluoromethylsulfonyl)imide in 5mL of anhydrous acetone, stir well , coated on aluminum foil with a film maker to form a uniform film;

[0037] (2) drying the aluminum foil coated with the film in vacuum for 6 hours at 50° C., then cooling, and peeling off to obtain the desired ionic liquid polymer film;

[0038] (3) Soak the ionic liquid polymer film in the 1,3-dioxolane / ethylene glycol dimethyl ether mixed solution of 1M bis(trifluoromethanesulfonate)imide lithium for 24 hours, after taking it out, use The excessive solvent is removed by filter paper, and the ionic liquid polymer gel electrolyte is obtained.

Embodiment 3

[0040] A kind of ionic liquid polymer gel electrolyte for solid-state lithium battery, its preparation method is as follows:

[0041] (1) Dissolve 1g of polyvinylidene fluoride-hexafluoropropylene copolymer and 0.5g of 1-methyl-3-ethylimidazole bis(trifluoromethylsulfonyl)imide in 5mL of anhydrous acetone, stir well , coated on aluminum foil with a film maker to form a uniform film;

[0042] (2) Under the condition of 55 ℃, vacuum-dry the aluminum foil coated with the film for 5 hours, then cool it down, and peel off to obtain the required ionic liquid polymer film;

[0043] (3) Soak the ionic liquid polymer film in the 1,3-dioxolane / ethylene glycol dimethyl ether mixed solution of 1M bis(trifluoromethanesulfonate)imide lithium for 23 hours, after taking it out, use The excessive solvent is removed by filter paper, and the ionic liquid polymer gel electrolyte is obtained.

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Abstract

The invention discloses an ionic liquid polymer gel electrolyte for a solid-state lithium battery, and a preparation method. The preparation method of the ionic liquid polymer gel electrolyte comprises the steps of (1) dissolving a polyvinylidene fluoride-hexafluoropropylene copolymer and 1-methyl-3-ethylimidazole bis(trifluoromethylsulfonyl)imide in anhydrous acetone, uniformly stirring the components, and coating an aluminum foil with a uniform thin film; (2) carrying out vacuum drying on the aluminum foil coated with the thin film, and then carrying out cooling and stripping to obtain a required ionic liquid polymer film; and (3) soaking the ionic liquid polymer film in a 1,3-dioxolane / ethylene glycol dimethyl ether mixed solution of lithium bis(trifluoromethylsulfonyl)imide, taking outthe film, and removing an excessive solvent by using filter paper to obtain the ionic liquid polymer gel electrolyte. The problem of dendritic crystal growth of a metal lithium negative electrode issolved.

Description

technical field [0001] The application belongs to the field of electrochemical energy storage, and relates to an ionic liquid polymer gel electrolyte for solid-state lithium batteries and a preparation method thereof. Background technique [0002] Since the current commercial lithium batteries mainly use graphite as the negative electrode material, the energy density is only 372mAh / g, which cannot meet the needs of the new generation of energy storage devices. Because metal lithium has high theoretical specific capacity (3860mAh / g), low reduction potential (-3.04V), low density (0.535g / cm 3 ) and other advantages, lithium metal batteries with high energy density are considered to play an important role in the next generation of energy storage systems. However, the growth of unstable Li dendrites in liquid electrolytes causes low Coulombic efficiency, short cycle life, and safety issues, which severely limit the practical application of Li metal batteries. On the other hand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565H01M2300/0025H01M2300/0085Y02E60/10
Inventor 金钟陈涛孔为华
Owner NANJING UNIV
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