Ionic liquid grafted molecular sieve imidazole framework composite solid polymer electrolyte and preparation method thereof

A solid polymer, grafted molecule technology, applied in solid electrolytes, electrolytes, non-aqueous electrolytes, etc., can solve the problems of low ionic conductivity at room temperature, not meeting commercial requirements, etc., to improve ionic conductivity, improve mechanical properties, The effect of good electrochemical stability

Active Publication Date: 2021-04-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, solid polymer electrolytes are challenged by their low room temperature ionic conductivity (10 -6 ~10 -8 S / cm), far below commercial requirements (>10 -4 S / cm)

Method used

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  • Ionic liquid grafted molecular sieve imidazole framework composite solid polymer electrolyte and preparation method thereof

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preparation example Construction

[0038] A preparation method of ionic liquid grafted molecular sieve imidazole framework composite solid polymer electrolyte, comprising the following steps:

[0039] (1) Mix 3-chloropropyltrimethoxysilane and 1-methylimidazole, stir at 60-100°C for 48-96 hours, then add a certain amount of water, and stir evenly to obtain a solution of 0.05-0.5 g / mL; Dissolve a certain amount of lithium bistrifluoromethanesulfonylimide (LiTFSI) in water, stir well to obtain a solution of 0.05-0.5 g / mL; quickly mix the two solutions, stir for 6-18 hours, and extract the solution with dichloromethane After 3 to 5 times, the viscous liquid of siloxane-containing imidazolium quaternary ammonium salt ionic liquid (Si-IL) was obtained after rotary evaporation.

[0040] (2) Add 0.005g / mL ethylenediamine solution in methanol dropwise to the methanol dispersion of ZIF-90, stir evenly at 40-80°C for 12-36h, then centrifuge and wash with methanol three times; Vacuum drying at 40-80°C for 8-16 hours, gri...

Embodiment 1

[0050] The preparation method of imidazole quaternary ammonium salt grafted molecular sieve imidazole framework composite solid polymer electrolyte comprises the following steps:

[0051] (1) Take 2mL of 3-chloropropyltrimethoxysilane and 2mL of 1-methylimidazole and stir at 80°C for 72h, then add 10mL of water and stir evenly; dissolve 1g LiTFSI in water and stir evenly; mix the two The solution was quickly mixed and stirred for 12 h; the resulting solution was extracted 5 times with dichloromethane, and a viscous liquid of Si-IL was obtained after rotary evaporation.

[0052] (2) Add 50 μL of ethylenediamine into 10 mL of methanol and ultrasonically disperse evenly; add dropwise a solution containing 0.15 g of ZIF-90 dissolved in 30 mL of methanol, and stir at 60°C for 24 hours; centrifuge the product and wash it with methanol three times, Vacuum dried at 60°C for 12h and ground to obtain ZIF-90-NH 2 .

[0053] (3) Take 0.2g ZIF-90-NH 2 Add 30mL toluene and stir evenly; t...

Embodiment 2

[0058] The preparation method of imidazole quaternary ammonium salt grafted molecular sieve imidazole framework composite solid polymer electrolyte comprises the following steps:

[0059] (1) Take 2mL of 3-chloropropyltrimethoxysilane and 10mL of 1-methylimidazole and stir at 100°C for 48h, then add 10mL of water and stir evenly; dissolve 1g LiTFSI in water and stir evenly; mix the two The solution was quickly mixed and stirred for 12 h; the resulting solution was extracted 5 times with dichloromethane, and a viscous liquid of Si-IL was obtained after rotary evaporation.

[0060] (2) Take 50 μL of ethylenediamine and add it to 10 mL of methanol for ultrasonic dispersion; add dropwise a solution containing 0.15 g of ZIF-90 dissolved in 30 mL of methanol, and stir at 80°C for 24 hours; centrifuge the product and wash it with methanol three times, Vacuum dried at 80°C for 12h and ground to obtain ZIF-90-NH 2 .

[0061] (3) Take 0.2g from step (2) ZIF-90-NH 2 Add 30 mL of tolue...

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Abstract

The invention discloses an ionic liquid grafted molecular sieve imidazole framework composite solid polymer electrolyte and a preparation method thereof. A molecular sieve imidazole framework is used for graft modification, imidazole quaternary ammonium salt ionic liquid is grafted on the surface, and modified nanoparticles are uniform in size and can be uniformly dispersed in a solvent without agglomeration. The synthesized imidazole quaternary ammonium salt grafted molecular sieve imidazole framework is used as a filler to prepare the composite solid polymer electrolyte, and the porous molecular sieve filler can improve the stability and electrochemical performance of the composite polymer electrolyte. The imidazole quaternary ammonium salt molecular sieve imidazole framework disclosed by the invention can be well dispersed in a composite polymer electrolyte, and the excellent stability of the molecular sieve imidazole framework and the high ionic conductivity of the ionic liquid are combined; and the high-performance molecular sieve imidazole framework composite solid polymer electrolyte provided by the invention has high room-temperature ionic conductivity and a wide electrochemical stability window.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to an ionic liquid grafted molecular sieve imidazole framework composite solid polymer electrolyte and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of portable electronic products, new energy vehicles and various electronic devices, people have put forward higher requirements for the energy density of lithium-ion batteries. The development of lithium metal batteries with lithium metal as the negative electrode is to improve battery energy. The future development direction of density (>350mAh / g). Solid polymer electrolytes have attracted extensive attention due to their good film-forming properties, good compatibility with lithium metal, and good safety, and the technology is mature. Currently, solid polymer electrolytes are challenged by their low room temperature ionic conductivity (10 -6 ~10 -8 S / cm), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082H01M2300/0091Y02E60/10
Inventor 王朝阳申金来雷志文邓永红
Owner SOUTH CHINA UNIV OF TECH
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