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Aqueous alkaline electrolyte and application thereof, zinc-based hybrid supercapacitor and preparation method thereof

A technology of supercapacitors and electrolytes, applied in the field of capacitors, which can solve the problems of narrow electrochemical window, low specific capacitance and low energy density.

Inactive Publication Date: 2020-09-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome defects such as narrow electrochemical window, low specific capacitance and low energy density of existing zinc-based hybrid capacitors, and provide a water-based alkaline electrolyte and its application, zinc-based hybrid supercapacitors, etc. Capacitor and its preparation method

Method used

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  • Aqueous alkaline electrolyte and application thereof, zinc-based hybrid supercapacitor and preparation method thereof
  • Aqueous alkaline electrolyte and application thereof, zinc-based hybrid supercapacitor and preparation method thereof
  • Aqueous alkaline electrolyte and application thereof, zinc-based hybrid supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Preparation of positive electrode: Activated carbon (positive electrode active material), acetylene black (conductive agent) and polytetrafluoroethylene (binder) are made into an electrode film with a mass ratio of 80:10:10, and pressed on a nickel mesh with a diameter of 15mm (Positive electrode current collector), after drying, it will be used as a positive electrode sheet;

[0107] Preparation of negative electrode: metal zinc is polished and cleaned to make a disc with a diameter of 18mm;

[0108] Preparation of electrolyte: Potassium hydroxide and zinc sulfate are dissolved in water in turn to prepare electrolyte, wherein the concentration of potassium hydroxide is 6 mol / L, and the concentration of zinc sulfate is 20 mmol / L;

[0109] Preparation of the diaphragm: the glass fiber diaphragm was made into a disc with a diameter of 19 mm.

[0110] Assembly: put the positive electrode sheet, diaphragm, and negative electrode sheet in sequence into the button battery ca...

Embodiment 2

[0121] Preparation of positive electrode: Activated carbon (positive electrode active material), acetylene black (conductive agent), and polytetrafluoroethylene (binder) are made into an electrode film at a mass ratio of 80:10:10, and pressed on a nickel mesh with a diameter of 15mm (Positive electrode current collector), after drying, it will be used as a positive electrode sheet;

[0122] Preparation of negative electrode: Zinc powder (negative electrode active material), acetylene black (conductive agent) and polytetrafluoroethylene (binder) are made into a counter electrode film with a mass ratio of 80:10:10, and pressed on a stainless steel plate with a diameter of 18mm On the current collector, as the negative electrode;

[0123] Preparation of electrolyte: Potassium hydroxide and zinc sulfate are dissolved in water in turn to prepare electrolyte, wherein the concentration of potassium hydroxide is 6 mol / L, and the concentration of zinc sulfate is 20 mmol / L;

[0124] Pr...

Embodiment 6-11

[0130] The zinc-based hybrid supercapacitors of Examples 6-11 are the same as Example 1 except that the positive electrode active material is different from Example 1, and the other materials and preparation methods are the same. As shown in Table 4 below:

[0131] Table 4

[0132]

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Abstract

The invention discloses an application of an aqueous alkaline electrolyte in preparation of an electrolyte of a zinc-based hybrid supercapacitor. The aqueous alkaline electrolyte comprises alkali andwater, wherein the alkali is alkali metal hydroxide and / or alkali metal acetate, and the concentration of the alkali is 0.1-13 mol / L. The invention further discloses the aqueous alkaline electrolyte which comprises alkali, zinc salt and water, wherein the alkali is alkali metal hydroxide and / or alkali metal acetate, the concentration of the alkali is 0.1-13 mol / L, and the molar concentration ratioof the alkali to the zinc salt is larger than 100: 1 and smaller than or equal to 13000: 1. The invention further provides a zinc-based hybrid supercapacitor and a preparation method thereof. The zinc-based hybrid supercapacitor prepared by the invention can maintain or obtain a wider electrochemical window on the basis of maintaining the power density, also has higher specific capacity and energy density, and shows a high capacitance retention rate in a long-cycle effect test.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an aqueous alkaline electrolyte and its application, a zinc-based hybrid supercapacitor and a preparation method thereof. Background technique [0002] At present, more than 80% of the world's energy consumption comes from traditional non-renewable energy sources, such as: coal, oil, natural gas, etc. The consumption of non-renewable energy has brought social problems such as energy shortage and environmental pollution, but it has also promoted the use of clean renewable energy such as solar energy and wind energy and the research and development of energy storage devices. Among many energy storage devices, lithium-ion batteries and supercapacitors are widely used in portable electronic devices such as mobile phones, digital cameras, and notebook computers, and there are more and more researches on them. Traditional lithium-ion batteries use graphite materials as negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/62H01G11/84
CPCH01G11/62H01G11/84Y02E60/13
Inventor 刘宇贺亮袁新海付丽君吴宇平
Owner NANJING UNIV OF TECH
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