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Novel high-conductivity polymerization ionic liquid electrolyte for supercapacitor

A polymeric ionic liquid and supercapacitor technology, which is applied in the field of electrochemistry, can solve the problems of poor molecular chain movement, unfavorable lithium ion migration, and difficult combination, so as to reduce crystallinity, improve electrochemical performance, and increase ion conductivity. Effect

Active Publication Date: 2018-09-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

PEO has a crystalline phase structure, high crystallinity, and reduces the number of lithium ion migration. PAN has low ionic conductivity and contains -CN, which has poor compatibility with electricity. PVC has a high glass transition temperature, and the molecular chain at room temperature Poor exercise ability, which is not conducive to the migration of lithium ions
At present, polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), which has good chemical stability and plasticity, has been studied as a solid electrolyte, but its high crystallinity makes its ionic conductivity low. For this problem, the existing technology is to use nanometer SiO 2 、Al 2 o 3 、TiO 2 Fillers such as particles are added to enhance its mechanical strength and electrical conductivity
However, these inorganic nanoparticles have high surface energy, it is difficult to combine well with the PVDF-HFP matrix, and they are easily segregated in the polymer matrix, even if they are dispersed by ball milling and ultrasonic vibration, it is difficult to make them uniform Dispersed in its matrix, it is difficult to get a good improvement in ionic conductivity from this method, and then it cannot improve the energy density and power density of the supercapacitor, nor can it improve the supercapacitor. charge and discharge cycle

Method used

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  • Novel high-conductivity polymerization ionic liquid electrolyte for supercapacitor
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  • Novel high-conductivity polymerization ionic liquid electrolyte for supercapacitor

Examples

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Effect test

Embodiment 1

[0018] The PVDF-HFP containing 5% PIL was dissolved in DMF, and after stirring at room temperature for 24h, a 1:1 ratio of [Emim][TFSI] ionic liquid was added, and stirred for another 10h to form a clear and viscous solution. The solution was coated on a glass plate, and dried in a drying oven at 60° C. for 12 hours to obtain a polymer electrolyte film with a thickness of 70 μm. Finally, the polymer electrolyte film was cut into a diameter of 16 mm. The solid electrolyte membrane is used to assemble a supercapacitor battery, and the active material of the pole pieces on both sides is activated carbon material. The supercapacitor battery was tested under the electrochemical workstation for cyclic voltammetry and constant potential test, the voltage range was 0-4V, and then the supercapacitor battery was subjected to a constant current charge and discharge test at a current density of 1A / g, and the voltage range was 0~4V. Under these conditions, the conductivity of the electro...

Embodiment 2

[0020] The PVDF-HFP containing 15% PIL was dissolved in DMF, and after stirring at room temperature for 24h, a 1:1 ratio of [Emim][TFSI] ionic liquid was added, and stirred for another 10h to form a clear and viscous solution. The solution was coated on a glass plate, and dried in a drying oven at 60° C. for 12 hours to obtain a polymer electrolyte film with a thickness of 70 μm. Finally, the polymer electrolyte film was cut into a diameter of 16 mm. The solid electrolyte membrane is used to assemble a supercapacitor battery, and the active material of the pole pieces on both sides is activated carbon material. The supercapacitor battery was tested under the electrochemical workstation for cyclic voltammetry and constant potential test, the voltage range was 0-4V, and then the supercapacitor battery was subjected to a constant current charge and discharge test at a current density of 1A / g, and the voltage range was 0~4V. Under these conditions, the conductivity of the electr...

Embodiment 3

[0022] The PVDF-HFP containing 25% PIL was dissolved in DMF, and after stirring at room temperature for 24h, a 1:1 ratio of [Emim][TFSI] ionic liquid was added, and stirred for another 10h to form a clear and viscous solution. The solution was coated on a glass plate, and dried in a drying oven at 60° C. for 12 hours to obtain a polymer electrolyte film with a thickness of 70 μm. Finally, the polymer electrolyte film was cut into a diameter of 16 mm. The solid electrolyte membrane is used to assemble a supercapacitor battery, and the active material of the pole pieces on both sides is activated carbon material. The supercapacitor battery was tested under the electrochemical workstation for cyclic voltammetry and constant potential test, the voltage range was 0-4V, and then the supercapacitor battery was subjected to a constant current charge and discharge test at a current density of 1A / g, and the voltage range was 0~4V. Under these conditions, the conductivity of the electr...

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Abstract

The invention relates to novel high-conductivity polymerization ionic liquid electrolyte for a supercapacitor. The electrolyte is characterized in that a novel polymerization ionic liquid is adopted as a conductive polymer, by virtue of designability of an ionic liquid structure, functional groups which can result in polymerization are introduced into branched chains, polymerization is implementedunder the action of an initiator, then a polymerization ionic liquid is generated, [Emin][TFSI] is adopted as a plasticizer which is commixed with polyvinylidene fluoride-hexafluoropropylene, and then solid polymerization ionic liquid electrolyte with high electric conductivity can be prepared. The invention aims to solve the problem that polymer electrolyte with PEO (Polyoxyethylene), PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene), PVC (Polyvinyl Chloride), PAN (Polyacrylonitrile) and the like as substrates is low in electric conductivity because of a high crystallization degree, andaims to provide novel solid polymerization ionic liquid electrolyte with high electric conductivity, circulation properties and security properties of the supercapacitor can be improved, and basic data can be provided for development of flexible devices.

Description

technical field [0001] The invention relates to a novel high-conductivity polymerized ionic liquid electrolyte for a supercapacitor, which belongs to the field of electrochemistry. Background technique [0002] In recent years, with the rapid development of flexible electronics science and the miniaturization technology of electronic products, wearable, foldable, flexible, and portable electronic devices have become more and more popular. The development of flexible electronic products is greatly restricted, so the development of light, thin, flexible high-performance energy storage devices that can provide energy has become a key technology that needs to be solved urgently in the current academic and industrial circles. Electrolyte is one of the key materials of energy storage batteries. Traditional liquid electrolytes are flammable, explosive, and easy to leak, which makes energy storage devices have certain safety hazards. Polymer electrolytes can replace traditional liqu...

Claims

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Application Information

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IPC IPC(8): H01G11/56
CPCH01G11/56Y02E60/13
Inventor 董陶温新鸽郑硕航沙一凡张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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