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Ionic liquid polymer composite solid electrolyte and preparation method thereof, and lithium ion battery

A technology of solid electrolytes and ionic liquids, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor electrochemical performance and safety performance, poor electrolyte film formation, and low electrochemical window, and achieve the goal of reducing side reactions Possibility, avoidance of migration, effect of wide electrochemical window

Active Publication Date: 2018-08-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The combination of these polymer substrates and ionic liquids is prone to phase separation and leakage, and the electrochemical performance and safety performance are poor.
At the same time, most of the existing ionic liquid polymer composite electrolytes are some imidazole-based polyionic liquids or pyridine-based polyionic liquids, which have a low electrochemical window.
In addition, many electrolytes need to add an excessive amount of ionic liquid in order to improve the conductivity, so that the film-forming property of the obtained electrolyte is poor, which is not conducive to practical application.

Method used

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  • Ionic liquid polymer composite solid electrolyte and preparation method thereof, and lithium ion battery
  • Ionic liquid polymer composite solid electrolyte and preparation method thereof, and lithium ion battery
  • Ionic liquid polymer composite solid electrolyte and preparation method thereof, and lithium ion battery

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preparation example Construction

[0039] The invention provides a preparation method of an ionic liquid polymer composite solid electrolyte, comprising:

[0040] A) mixing methacryloyloxyethyltrimethylammonium chloride, lithium bistrifluoromethanesulfonylimide and water, and obtaining a layered solution after standing;

[0041] B) separating the lower layer liquid of the layered liquid, washing the lower layer liquid with deionized water until there is no chloride ion in the washed supernatant to obtain a standby ionic liquid;

[0042] C) Mix the standby ionic liquid, polyethylene glycol methyl ether methacrylate and the first solvent, and after heating up to 60-70°C, mix the obtained mixture with benzoyl peroxide and react for 10-15 hours to obtain Ionic liquid polymers;

[0043] D) mixing the ionic liquid polymer, inorganic filler, lithium bistrifluoromethanesulfonimide and a second solvent, and drying to obtain an ionic liquid polymer composite solid state electrolyte.

[0044] In the invention, methacryl...

Embodiment 1

[0081] After mixing 20g (0.096mol) of methacryloyloxyethyltrimethylammonium chloride with 80mL of water, add 35g (0.122mol) of lithium bistrifluoromethanesulfonylimide, stir and mix for 8h, and then statically After standing for 12h, a layered solution was obtained.

[0082] Use a separatory funnel to separate the lower layer liquid, wash the lower layer liquid with deionized water, and after each washing, take a small amount of supernatant and add it to the silver nitrate solution until no precipitation occurs, which proves that the chloride ions have all been eliminated. remove. Then, the washed lower layer liquid was dried for 24 hours in a freeze dryer at -40° C. and a vacuum of 2 Pa to obtain a spare ionic liquid and then refrigerated. Then, 8.5g of standby ionic liquid, 1.5g of polyethylene glycol methyl ether methacrylate and 20mL of N-methylpyrrolidone were mixed, and the 2 Under the atmosphere, after heating up to 65°C, the mixture obtained was mixed with 0.01g of b...

Embodiment 2

[0091] After mixing 20g (0.096mol) of methacryloyloxyethyltrimethylammonium chloride with 80mL of water, add 35g (0.122mol) of lithium bistrifluoromethanesulfonylimide, stir and mix for 8h, and then statically After standing for 12h, a layered solution was obtained.

[0092] Use a separatory funnel to separate the lower layer liquid, wash the lower layer liquid with deionized water, and after each washing, take a small amount of supernatant and add it to the silver nitrate solution until no precipitation occurs, which proves that the chloride ions have all been eliminated. remove. Then, the washed lower layer liquid was dried for 24 hours in a freeze dryer at -40° C. and a vacuum of 2 Pa to obtain a spare ionic liquid and then refrigerated. Then, 7.5g of standby ionic liquid, 2.5g of polyethylene glycol methyl ether methacrylate and 20mL of N-methylpyrrolidone were mixed, and the 2 Under the atmosphere, after heating up to 68 ° C, the mixture obtained was mixed with 0.01 g o...

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Abstract

The invention provides an ionic liquid polymer composite solid electrolyte and a preparation method thereof, and a lithium ion battery. A quaternary ammonium ionic liquid polymer with higher oxidationresistance is synthesized by adopting methacryloyl ethyl trimethyl ammonium chloride, lithium difluoromethane sulfonimide and polyethylene glycol methyl ether methacrylate as main raw materials; thepolyethylene glycol methyl ether methacrylate provides better flexibility for the finally-synthesized ionic liquid polymer, so that the problems of phase separation and liquid leakage are solved; thefinally-prepared ionic liquid polymer composite solid electrolyte is higher in electric conductivity and better in cyclic stability and safety. Meanwhile, in the obtained ionic liquid polymer, due tothe existence of a poly-cationic structure, bisfluoromethane sulfonimide anions can be captured, so that the migration between positive and negative electrodes is avoided, the lithium ion conduction is facilitated, and meanwhile, the possibility of side reaction on an interface is reduced. Therefore, the ionic liquid composite electrolyte has a wider electrochemical window.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to an ionic liquid polymer composite solid electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have become a hotspot in the research of new battery technology due to their advantages such as high specific energy, no memory effect, large storage capacity, small size, and long cycle life. [0003] Power lithium-ion batteries are basically composed of key parts such as positive and negative electrodes, separators, and electrolytes. They continue to develop in three main directions: one is to meet high-voltage requirements, from 3V to 5V; the other is to increase specific energy and high-rate charging. Discharge performance, such as from mobile phone batteries to automotive power lithium batteries, etc., the energy density and power density under high-rate charge and discharge need to be improved; the thi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565
CPCH01M10/0525H01M10/0565Y02E60/10
Inventor 马丹丹夏永高石俊黎刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI