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Preparation method of ionic conductor/polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking

A technology of polyethylene oxide and solid electrolyte, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of large internal polarization, unfavorable battery cycle, etc., and achieve improved ion conductivity, efficient transmission path, high The effect of ionic conductivity

Active Publication Date: 2020-06-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, since the polymer-based solid-state electrolyte contains positive and negative ions dissolved in lithium salts, the migration of positive and negative ions occurs during the electrochemical process, and the migration of negative ions tends to generate large internal polarization, which is not conducive to the cycle of the battery. The ion migration number of polymer-based solid electrolytes still needs to be further optimized and improved

Method used

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  • Preparation method of ionic conductor/polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking
  • Preparation method of ionic conductor/polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking
  • Preparation method of ionic conductor/polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking

Examples

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Embodiment 1

[0035] A method for preparing an ion conductor / polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking comprises:

[0036] 1) Dissolve 0.3 g of zinc nitrate hexahydrate and 0.66 g of 2-methylimidazole in 11.3 g of methanol solution, and then mix and stir the two solutions for 24 hours;

[0037] 2) The mixture obtained in step 1) was centrifuged with methanol at a speed of 10,000 r / min, washed three times, and then placed in a vacuum oven at 70°C for 12 hours to prepare ZIF-8;

[0038] 3) Put the ZIF-8 material in step 2) into a vacuum oven at 120°C and place it for 12 hours to obtain activated ZIF-8;

[0039] 4) dissolving the lithium bistrifluoromethanesulfonylimide salt in an ionic liquid (EMIM-TFSI) with a mass ratio of 3:20, and stirring it magnetically for 6 hours to obtain an ionic liquid containing the lithium salt;

[0040] 5) Add the lithium salt-containing ionic liquid in step 4) into the activated ZIF-8 with a mass ratio of 1:1.5, grind it eve...

Embodiment 2

[0050] A method for preparing an ion conductor / polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking comprises:

[0051] 1) Dissolve 0.3 g of cobalt nitrate hexahydrate and 0.66 g of 2-methylimidazole in 11.3 g of methanol solution, and then mix and stir the two solutions for 24 hours;

[0052] 2) The mixture obtained in step 1) was centrifuged with methanol at a speed of 10,000 r / min, washed three times, and then placed in a vacuum oven at 70°C for 12 hours to prepare ZIF-67;

[0053] 3) Put the ZIF-67 material in step 2) into a vacuum oven at 120°C and place it for 12 hours to obtain activated ZIF-67;

[0054] 4) dissolving the lithium bistrifluoromethanesulfonylimide salt in an ionic liquid (EMIM-TFSI) with a mass ratio of 3:20, and stirring it magnetically for 6 hours to obtain an ionic liquid containing the lithium salt;

[0055] 5) Add the lithium salt-containing ionic liquid in step 4) into the activated ZIF-67 with a mass ratio of 1:1.5, grind ...

Embodiment 3

[0065] A method for preparing an ion conductor / polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking comprises:

[0066] 1) Dissolve 0.3 g of zinc nitrate hexahydrate and 0.66 g of 2-methylimidazole in 11.3 g of methanol solution, and then mix and stir the two solutions for 24 hours;

[0067] 2) The mixture obtained in step 1) was centrifuged with methanol at a speed of 10,000 r / min, washed three times, and then placed in a vacuum oven at 70°C for 12 hours to prepare ZIF-8;

[0068] 3) Put the ZIF-8 material in step 2) into a vacuum oven at 120°C and place it for 12 hours to obtain activated ZIF-8;

[0069] 4) dissolving the lithium bistrifluoromethanesulfonylimide salt in an ionic liquid (EMIM-TFSI) with a mass ratio of 3:10, and stirring it magnetically for 6 hours to obtain an ionic liquid containing the lithium salt;

[0070] 5) Add the lithium salt-containing ionic liquid in step 4) into the activated ZIF-8 with a mass ratio of 1:1.5, grind it eve...

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Abstract

The invention relates to a preparation method of an ionic conductor / polyoxyethylene composite solid electrolyte based on ultraviolet crosslinking. The method comprises the following steps: 1) dissolving a lithium salt in an ionic liquid, and magnetically stirring to obtain an ionic liquid containing the lithium salt; 2) adding an ionic liquid containing a lithium salt into the activated MOFs material, uniformly grinding, and drying at high temperature to obtain an MOFs-based ionic conductor; 3) mixing polyoxyethylene, a lithium salt and the MOFs-based ion conductor in the step 2), carrying outball milling, and carrying out compression molding to obtain a compact composite solid electrolyte film; 4) uniformly coating the cross-linking liquid on the surface of the obtained composite solid electrolyte film; and 5) irradiating the composite solid electrolyte film in the step 4) with ultraviolet light after the composite solid electrolyte film is fully absorbed to prepare the ionic conductor / polyoxyethylene composite solid electrolyte. The beneficial effects of the present invention are that the material has excellent comprehensive performance and can be used as a solid electrolyte material in solid batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion solid-state electrolytes, and in particular relates to a method for preparing an ion conductor / polyethylene oxide composite solid-state electrolyte based on ultraviolet crosslinking. The obtained composite solid-state electrolyte has excellent comprehensive performance and has broad application in the field of solid-state batteries. Application prospects. Background technique [0002] With the increasing problems of energy crisis and environmental pollution, social progress and human development are increasingly dependent on clean and renewable energy. As one of the representatives of clean energy, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, large-scale energy storage and other fields because of their advantages such as large output power, high voltage, low self-discharge, no memory effect, and environmental protection. However, commercial li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 徐林夏阳阳麦立强
Owner WUHAN UNIV OF TECH
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