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A method to construct high-performance supercapacitors by adjusting the electrode voltage range

A technology of supercapacitor and electrode voltage, applied in hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of not being suitable for porous activated carbon, etc., and achieve the effect of improving the working voltage window, simple operation, and optimizing the voltage range

Active Publication Date: 2019-09-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode material used here is onion carbon without micropores, and this method is not suitable for the more widely used commercially available porous activated carbons.

Method used

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  • A method to construct high-performance supercapacitors by adjusting the electrode voltage range
  • A method to construct high-performance supercapacitors by adjusting the electrode voltage range
  • A method to construct high-performance supercapacitors by adjusting the electrode voltage range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1) Characterization of commercial activated carbon (model: YP-50F) in the electrolyte butylmethylimidazole-bistrifluoromethanesulfonimide dissolved in propylene carbonate (BMIM-NTf 2 / PC), the concentration is 1.0 mol / L, in the limit voltage window, the maximum limit voltage is 1.6V, and the minimum limit voltage is -1.6 V, so the stable voltage window is -1.6↔1.6 V.

[0066] 2) Use BMIM-NTf 2 / PC electrolyte and YP-50F electrode to assemble a supercapacitor, test the voltage range of its positive and negative electrodes, and find that the electrode voltage range is positive relative to the stable voltage window. The maximum operating voltage window of the device is 2.8 V.

[0067] 3) Preparation of type A silica (size 7nm) grafted ionic liquid SiO 2 -IL-NTf 2 , whose structure is as follows.

[0068]

[0069] 4) Add 10% SiO 2 -IL-NTf 2 in BMIM-NTf 2 / PC electrolyte, using additive electrolyte and YP-50F electrode to assemble a supercapacitor, testing the volt...

Embodiment 2

[0072] 1) Characterization of polyaniline activated carbon in electrolyte ethylmethylimidazole-hexafluorophosphoric acid (EMIM-PF 6 ), the maximum limit voltage is 2.0 V, and the minimum limit voltage is -1.8 V, so the stable voltage window is -1.8↔2.0 V.

[0073] 2) Use EMIM-PF 6 Electrolyte and polyaniline activated carbon electrodes were used to assemble a supercapacitor, and the voltage range of its positive and negative electrodes was tested, and it was found that the electrode voltage range was positive relative to the stable voltage window. The maximum operating voltage window of the device is 3.2V.

[0074] 3) Preparation of A-type silica (size 15nm) grafted ionic liquid SiO 2 -IL-PF 6 , whose structure is as follows.

[0075]

[0076] 4) Add 15% SiO 2 -IL-PF 6 at EMIM-PF 6 Electrolyte, using additive electrolyte and polyaniline activated carbon electrodes to assemble a supercapacitor, testing the voltage range of its positive and negative electrodes, it is f...

Embodiment 3

[0079] 1) Characterization of sodium alginate activated carbon in electrolyte ethylmethylimidazole-tetrafluoroboric acid (EMIM-BF 4 ), the maximum limit voltage is 1.8 V, and the minimum limit voltage is -1.6 V, so the stable voltage window is -1.6↔1.8V.

[0080] 2) Use EMIM-BF 4 Electrolyte and sodium alginate activated carbon electrodes were used to assemble a supercapacitor, and the voltage range of its positive and negative electrodes was tested, and it was found that the electrode voltage range was positive relative to the stable voltage window. The maximum operating voltage window of the device is 3.0V.

[0081] 3) Preparation of A-type silica (size 15nm) grafted ionic liquid SiO 2 -IL-BF 4 , whose structure is as follows.

[0082]

[0083] 4) Add 15% SiO 2 -IL-BF 4 at EMIM-BF 4 Electrolyte, using additive electrolyte and sodium alginate activated carbon electrode to assemble a supercapacitor, testing the voltage range of its positive and negative electrodes, i...

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Abstract

The invention discloses a method for constructing a high-performance supercapacitor by adjusting an electrode voltage range, and the method specifically includes representing a stable voltage window of activated carbon in an electrolyte and respective voltage ranges of positive and negative electrodes, through comparison of a relationship between the voltage ranges of positive and negative electrodes and the stable voltage window, selecting a corresponding type of a silicon dioxide grafted ionic liquid to adjust the voltage ranges of the positive and negative electrodes, and increasing a working voltage window of the device, thereby improving the energy density and cycling stability of the device.

Description

technical field [0001] The invention relates to a method for constructing a high-performance supercapacitor by adjusting the electrode voltage range. Background technique [0002] Supercapacitors (also known as electric double layer capacitors) constructed of porous activated carbon and ionic liquids have the advantages of fast charge and discharge capabilities, good cycle stability and wide operating voltage window, and are a promising energy storage device. However, compared with lithium-ion batteries, supercapacitors still have the problem of low energy density. Improving the energy density of supercapacitors is the key to further broaden their practical applications. The energy density of a supercapacitor is proportional to the square of the working voltage window, so increasing the working voltage window is a very effective way to increase the energy density. [0003] The theoretical operating voltage window of a supercapacitor is determined by the maximum limit volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/64H01G11/32
CPCH01G11/32H01G11/64Y02E60/13
Inventor 阎兴斌窦青云杨兵军杨娟
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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