Method for constructing zinc ion hybrid supercapacitor based on eutectic solvent electrolyte

A technology of deep eutectic solvent and supercapacitor, which is applied in hybrid capacitor electrolyte, hybrid/electric double layer capacitor manufacturing, etc., to achieve the effect of price security, avoiding short circuit, and cheap raw materials

Active Publication Date: 2021-02-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of Zn dendrites produced by aqueous electrolytes, the present invention proposes a method for constructing zinc-ion hybrid supercapacitors based on deep eutectic solvent electrolytes

Method used

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  • Method for constructing zinc ion hybrid supercapacitor based on eutectic solvent electrolyte
  • Method for constructing zinc ion hybrid supercapacitor based on eutectic solvent electrolyte
  • Method for constructing zinc ion hybrid supercapacitor based on eutectic solvent electrolyte

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Experimental program
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Embodiment 1

[0029] (1) Zinc anode preparation: Polish the commercial zinc sheet (about 2mm) to remove the oxide layer on the surface;

[0030] (2) Preparation of porous carbon cathode: the commercial porous carbon (S BET ≈1900m 2 g -1 ) and the binder are uniformly mixed in a mass ratio of 90:10, and then the mixture is rolled into a thin sheet, and the sheet is pressed into a circular electrode sheet with a diameter of 12mm by a press.

[0031] (3) Preparation of deep eutectic solvent electrolyte: ZnCl 2 Mix evenly with ethylene glycol at a molar ratio of 1:2, heat at 90°C for 2 hours, and cool to room temperature naturally, then follow ZnCl 2 Add 1,2 dichloroethane to the above solution in a molar ratio of 1:6 to 1,2 dichloroethane, stir for 30 minutes to form ZnCl 2 / ethylene glycol / 1,2-dichloroethane deep eutectic solvent electrolyte.

[0032] (4) Zinc-ion hybrid supercapacitors were assembled sequentially by zinc sheets, separators (dropped with deep eutectic solvent electrolyte...

Embodiment 2

[0034] (1) Zinc anode preparation: Polish the commercial zinc sheet (about 2mm) to remove the oxide layer on the surface;

[0035] (2) Preparation of porous carbon cathode: the commercial porous carbon (S BET ≈1900m 2 g -1 ) and the binder are uniformly mixed in a mass ratio of 90:10, and then the mixture is rolled into a thin sheet, and the sheet is pressed into a circular electrode sheet with a diameter of 12mm by a press.

[0036] (3) Preparation of deep eutectic solvent electrolyte: ZnCl 2 Mix well with urea at a molar ratio of 1:3, heat at 100°C for 2 hours, and cool to room temperature naturally, then follow ZnCl 2 Add 1,2 dichloroethane to the above solution in a molar ratio of 1:8 to 1,2 dichloroethane, stir for 30 minutes to form ZnCl 2 / urea / 1,2-dichloroethane deep eutectic solvent electrolyte.

[0037] (4) Zinc-ion hybrid supercapacitors were assembled sequentially by zinc sheets, separators (dropped with deep eutectic solvent electrolyte), and porous carbon ca...

Embodiment 3

[0039] (1) Zinc anode preparation: Polish the commercial zinc sheet (about 2mm) to remove the oxide layer on the surface;

[0040] (2) Preparation of porous carbon cathode: the commercial porous carbon (S BET ≈1900m 2 g -1 ) and the binder are uniformly mixed in a mass ratio of 90:10, and then the mixture is rolled into a thin sheet, and the sheet is pressed into a circular electrode sheet with a diameter of 12mm by a press.

[0041] (3) Preparation of deep eutectic solvent electrolyte: ZnCl 2 Mix evenly with acetamide at a molar ratio of 1:5, heat at 110°C for 4 hours, and cool to room temperature naturally, then follow ZnCl 2 Add dimethyl carbonate to the above solution in a molar ratio of 1:10 to dimethyl carbonate, stir for 30min to form ZnCl 2 / acetamide / dimethyl carbonate deep eutectic solvent electrolyte.

[0042] (4) Zinc-ion hybrid supercapacitors were assembled sequentially by zinc sheets, separators (dropped with deep eutectic solvent electrolyte), and porous c...

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Abstract

The invention provides a method for constructing a zinc ion hybrid supercapacitor based on an eutectic solvent electrolyte, belonging to the technical field of electrochemical energy storage. The eutectic solvent electrolyte is prepared by uniformly mixing zinc chloride and a hydrogen bond donor substance according to a certain molar ratio, carrying out heating for a reaction and then adding one or two conductive agents, wherein the hydrogen bond donor substance is one or two selected from the group consisting of urea, ethylene glycol, choline chloride and acetamide, and the conductive agent is one or two selected from the group consisting of 1,2-dichloroethane and dimethyl carbonate. According to the invention, the conductivity of the electrolyte of the zinc ion hybrid supercapacitor canbe improved, and the growth of zinc dendrites is inhibited, so the electrochemical performance of the hybrid supercapacitor is improved. Meanwhile, the electrolyte used in the invention is a non-combustible substance, and is safer and more environment-friendly compared with an ionic liquid / organic electrolyte.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a method for using a deep eutectic solvent electrolyte in the field of zinc-ion hybrid supercapacitors. Background technique [0002] Supercapacitors have high power density, excellent cycle stability and high safety. But the energy density of supercapacitors has been unsatisfactory. The hybrid supercapacitor has the advantages of both batteries and supercapacitors, and has battery-type electrodes and capacitive electrodes, which is an important method to improve the energy density of supercapacitors. [0003] Li-ion, Na-ion, and K-ion hybrid supercapacitors have been extensively studied. However, most of these capacitors use organic electrolyte, which has certain potential safety hazards. Recently, Zn-ion hybrid supercapacitors have been favored due to their abundant resources, environmental friendliness, good chemical stability, and high th...

Claims

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Application Information

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IPC IPC(8): H01G11/62H01G11/84H01G11/86
CPCH01G11/62H01G11/84H01G11/86Y02E60/13
Inventor 吕耀辉程荣荣张乐乐马连波田华东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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