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Bionic aqueous electrolyte, preparation method and application in supercapacitor

An aqueous electrolyte and electrolyte technology, which is applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrolytes, etc. Stable window, large-scale production, and simple method

Pending Publication Date: 2020-12-08
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the currently developed "water-in-salt" and organic-inorganic hybrid electrolytes are still expensive and have certain toxicity.
These limit the large-scale production and application of such electrolytes and supercapacitors

Method used

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  • Bionic aqueous electrolyte, preparation method and application in supercapacitor
  • Bionic aqueous electrolyte, preparation method and application in supercapacitor
  • Bionic aqueous electrolyte, preparation method and application in supercapacitor

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Embodiment 1

[0029] Dissolve lithium bistrifluoromethanesulfonylimide with a final concentration of 2 mol / L into 6 wt% water to form an aqueous electrolyte solution, then mix 94 wt% PEG-200 with the aqueous electrolyte solution, and stir with a magnetic force Stir with a mixer for 1 h, fully stir evenly, and obtain one of the biomimetic water-based electrolytes provided by the present invention, which is denoted as 2m LiTFSI-94%PEG200-6%H 2 O.

Embodiment 2

[0039] Dissolve sodium perchlorate with a final concentration of 1 mol / L into 6 wt% water to form an aqueous electrolyte solution, then mix 94 wt% PEG-200 with the aqueous electrolyte solution, and stir for 1 h with a magnetic stirrer. Thoroughly stir evenly to obtain one of the biomimetic water-based electrolytes provided by the invention, denoted as 1m NaClO 4 -94%PEG200-6%H 2 O.

Embodiment 3

[0041] Dissolve lithium perchlorate with a final concentration of 0.35 mol / L into 6 wt% water to form an aqueous electrolyte solution, then mix 94 wt% PEG-200 with the aqueous electrolyte solution, and stir for 1 h with a magnetic stirrer. Fully stir evenly, obtain a kind of in the biomimetic water system electrolyte solution provided by the present invention, denote as 0.35m LiClO 4 -94%PEG200-6%H 2 O.

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Abstract

The invention relates to a bionic aqueous electrolyte, a preparation method and application of the bionic aqueous electrolyte in a supercapacitor. The bionic aqueous electrolyte is prepared from an electrolyte aqueous solution and small molecular weight polyethylene glycol(PEG); the electrolyte is one of lithium bis(trifluoromethanesulfonyl) imide, sodium perchlorate, lithium perchlorate or sodiumtrifluoromethanesulfonate; the small molecular weight PEG is one of the number-average molecular weight Mn of 200-600. The bionic aqueous electrolyte provided by the invention has a high electrochemical stability window, and is safe, non-combustible and resistant to high temperature; the preparation method of the bionic aqueous electrolyte is simple, so that the bionic aqueous electrolyte is easyto prepare, and large-scale production is facilitated. The voltage window of the water system super capacitor assembled based on the bionic water system electrolyte is up to 2.5 V, and the water system super capacitor can be safely and effectively applied in a normal-temperature environment and a high-temperature environment and has good capacitance behavior and rate capability.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and relates to a water-based electrolyte, a water-based supercapacitor and a preparation method thereof. Background technique [0002] As a power energy storage device, supercapacitors have been widely used in electronic equipment, night lighting, rail transit, aerospace and other fields. Compared with other energy storage devices, supercapacitors have the advantages of high power density, fast charge and discharge, excellent rate performance and long cycle life. As scientific researchers continue to explore the performance of supercapacitors, their performance in all aspects has also been greatly improved. However, low energy density is still an important factor restricting its development. [0003] The device structure of a supercapacitor mainly includes current collectors, electrode materials, electrolytes, diaphragms, and packaging materials. In addition to the traditional design o...

Claims

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Application Information

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IPC IPC(8): H01G11/58H01G11/62H01G11/64H01G11/84
CPCH01G11/58H01G11/62H01G11/64H01G11/84Y02E60/13
Inventor 袁凯陈义旺彭梦科胡婷
Owner NANCHANG UNIV
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