Ion liquid-based quasi-solid electrolyte for lithium battery and preparation method of quasi-solid electrolyte

An ionic liquid and quasi-solid-state technology, applied in the field of lithium secondary batteries, can solve problems such as low Coulombic efficiency, and achieve the effects of easy availability of raw materials, low overpotential, and long-term cycle stability

Active Publication Date: 2017-10-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at problems such as lithium dendrite formation and low coulombic efficiency existing in the charge-discharge cycle process of existing lithium batteries, the object of the present invention is to provide a quasi-solid electrolyte based on ionic liquids for lithium batteries and a preparation method thereof. The electrolyte has high ionic conductivity, and can stabilize the stripping / deposition process of metal lithium and inhibit the growth of lithium dendrites; the method is simple in process, easy to obtain raw materials, safe and pollution-free, and is suitable for large-scale batch production

Method used

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  • Ion liquid-based quasi-solid electrolyte for lithium battery and preparation method of quasi-solid electrolyte
  • Ion liquid-based quasi-solid electrolyte for lithium battery and preparation method of quasi-solid electrolyte
  • Ion liquid-based quasi-solid electrolyte for lithium battery and preparation method of quasi-solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) In a glove box filled with argon gas with a purity greater than or equal to 99% and a moisture content of less than 1ppm, first place 0.91g LiN(SO 2 CF 3 ) 2 Dissolve in 4.6g N-methyl, propylpyrrolidine bistrifluoromethanesulfonimide salt, and stir for 24h to obtain ionic liquid electrolyte; then add 2.8g 3-methacryloyloxypropyl trimethoxy base silane and mix evenly; finally add 2.5mL formic acid with a purity greater than 98%, and continue stirring for 8min to obtain a reaction system;

[0033] (2) The reaction system obtained in step (1) was removed from the glove box, placed in a vacuum oven with a relative vacuum of -80KPa, and dried at 50°C for 7 days to obtain a quasi-solid electrolyte based on ionic liquid for lithium batteries.

[0034] from figure 1 It can be seen from the SEM images in the figure that the surface of the quasi-solid electrolyte prepared in this embodiment is smooth without cracks. The resulting quasi-solid-state electrolyte was washed t...

Embodiment 2

[0037] (1) In a glove box filled with argon gas with a purity greater than or equal to 99% and a moisture content of less than 1ppm, first put 1.82g LiN(SO 2 CF 3 ) 2 Dissolve in 4.6g N-methyl, propylpyrrolidine bistrifluoromethanesulfonimide salt, and stir for 24h to obtain an ionic liquid electrolyte; then add 0.7g 3-methacryloyloxypropyl trimethoxy base silane and 0.82g 3-methacryloxypropyltriethoxysilane and mix well; finally add 1.25mL formic acid with a purity greater than 98%, and continue stirring for 8min to obtain a reaction system;

[0038] (2) The reaction system obtained in step (1) was removed from the glove box, placed in a vacuum drying oven with a relative vacuum of -100KPa, and dried at 70°C for 7 days to obtain a quasi-solid electrolyte based on ionic liquid for lithium batteries.

[0039] From the SEM image of the quasi-solid electrolyte prepared in this example, it can be seen that the prepared quasi-solid electrolyte has a smooth surface without cracks,...

Embodiment 3

[0042] (1) In a glove box filled with argon gas with a purity greater than or equal to 99% and a moisture content of less than 1ppm, first place 4.368g LiN(SO 2 CF 3 ) 2 Dissolve in 4.6g N-methyl, propylpyrrolidine bis-trifluoromethanesulfonimide salt and 10.1g N-methyl, propylpiperidine bis-trifluoromethanesulfonimide salt, and stir for 24h to obtain Ionic liquid electrolyte; add 1.4g 3-methacryloxypropyltrimethoxysilane, 0.82g 3-methacryloxypropyltriethoxysilane and 0.65g γ-methacryloxy Propylmethyldimethoxysilane and mix well; finally add 1.62g of high-purity water, and continue to stir for 15min to obtain a reaction system;

[0043] (2) The reaction system obtained in step (1) was removed from the glove box, placed in a vacuum oven with a relative vacuum of -90KPa, and dried at 90°C for 5 days to obtain a quasi-solid electrolyte based on ionic liquid for lithium batteries.

[0044] From the SEM image of the quasi-solid electrolyte prepared in this example, it can be see...

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Abstract

The invention relates to an ion liquid-based quasi-solid electrolyte for a lithium battery and a preparation method of the quasi-solid electrolyte, and belongs to the technical field of a lithium secondary battery. The quasi-solid electrolyte is of a porous network structure prepared by condensation reaction of a lithium salt, an ion liquid, a silane coupling agent and a catalyst and has high ion conductivity; the quasi-solid electrolyte can be used for stabilizing the stripping/deposition process of metal lithium and preventing lithium dentrites from growing, and shows relatively low overpotential and long-term cycle stability during the constant-current polarization process; and the interface impedance of a metal lithium sheet and the quasi-solid electrolyte is relatively small and is hardly increased with prolonging of the battery placement time. The preparation process of the quasi-solid electrolyte is simple, conventional equipment is used, the raw material is available, and the quasi-solid electrolyte is safe without pollution and is suitable for production on a large scale.

Description

technical field [0001] The invention relates to an ionic liquid-based quasi-solid electrolyte for lithium batteries and a preparation method thereof, belonging to the technical field of lithium secondary batteries. Background technique [0002] Lithium metal has the highest theoretical capacity (3860mAh / g) and extremely low reduction potential, making it an ideal negative electrode. Development of Li-S batteries and Li-O batteries using metallic lithium as a negative electrode pair 2 Batteries are critical. However, the formation of lithium dendrites and low Coulombic efficiency during the battery charge-discharge cycle seriously hinder the commercialization of metal lithium batteries. A stable lithium metal / electrolyte interface is a prerequisite for ensuring the safety and long cycle life of lithium metal batteries. One of the improvement strategies is to use solid-state electrolytes instead of liquid electrolytes, mainly to avoid the continuous side reactions of liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M10/0566H01M10/052H01M2300/0045Y02E60/10H01M10/0525H01M10/0562H01M2300/0074
Inventor 陈楠陈人杰吴锋王丽莉戴玉娟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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