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Potassium ion hybrid capacitor and preparation method thereof

A hybrid capacitor, potassium ion technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc. Chemical properties and other issues, to achieve the effect of favorable utilization, high energy-power performance, and promotion of kinetics

Active Publication Date: 2020-08-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the kinetic mismatch between battery-type anodes and capacitive-type cathodes and the difficulty in achieving charge / mass balance at all tested rates are significant challenges for potassium-ion hybrid capacitors.
These unfavorable factors will greatly reduce the overall electrochemical performance of potassium ion hybrid capacitors

Method used

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  • Potassium ion hybrid capacitor and preparation method thereof
  • Potassium ion hybrid capacitor and preparation method thereof
  • Potassium ion hybrid capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Activated activated carbon was used as the positive electrode material, which was activated in a tube furnace at 800°C for 60 minutes by mixing commercial activated carbon with KOH at a ratio of 1:5. After activation, the sample was washed in 1 mol / L HCl to remove residual KOH, then filtered and washed with a large amount of deionized water until neutral, and dried. After activation, mix activated carbon with conductive carbon black (super P) and binder (sodium carboxymethyl cellulose) in a ratio of 8:1:1, add deionized water and stir evenly, and coat on aluminum foil to obtain a positive electrode . The active carbon positive electrode is used as the working electrode, and the potassium sheet is used as the counter electrode to assemble a potassium ion half-cell. It is tested under a working voltage window of 1.5 to 4.1 volts (relative to potassium / potassium ions). The charge and discharge curves under different current densities are as follows: figure 1 As shown, the...

Embodiment 2

[0048] This embodiment is the same as Embodiment 1, except that the mass ratio of the positive / negative electrodes of the potassium ion hybrid capacitor is 1.8:1. Specifically, the activated carbon is used as the positive electrode after activation, and the nitrogen / oxygen co-doped carbon nanosheets prepared by carbonization for 60 minutes after pre-potassiation treatment are used as the negative electrode. Ester and diethyl carbonate (volume ratio 1:1) are used as the electrolyte to assemble a potassium ion hybrid capacitor with a positive / negative electrode mass ratio of 1.8:1. The rate performance of potassium ion hybrid capacitors is as follows: Figure 8 As shown, it has a specific capacity of 83.6 mAh / g at a current density of 0.5 A / g. Its excellent rate performance is reflected in the fact that it still maintains a high specific capacity of 69.1 mAh / g at a high current density of 10 A / g, showing excellent fast charge / discharge capabilities. Figure 9 The relationship ...

Embodiment 3

[0050] This embodiment is the same as Example 1, except that the electrolyte is 0.8 mol / liter of potassium hexafluorophosphate dissolved in ethylene carbonate and diethyl carbonate (volume ratio 1:1), and the positive / negative electrode mass ratio is 1.8: 1. Specifically, the activated carbon is used as the positive electrode after activation, and the nitrogen / oxygen co-doped carbon nanosheets prepared by carbonization for 60 minutes after pre-potassiation treatment are used as the negative electrode. 0.8 mol / L potassium hexafluorophosphate is dissolved in ethylene carbonate and carbonic acid Diethyl ester (volume ratio 1:1) is used as the electrolyte, and a potassium ion hybrid capacitor is assembled, and the positive / negative electrode mass ratio is 1.8:1. Its energy density and power density are as Figure 10 As shown, there are energy densities of 142 and 71 Wh / kg at power densities of 926 and 13452 W / kg.

[0051] In summary, electrode material design, electrolyte optimi...

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Abstract

The invention discloses a potassium ion hybrid capacitor and a preparation method thereof. The potassium ion hybrid capacitor comprises a capacitance type positive electrode, a battery type negative electrode and an organic electrolyte, and the preparation method comprises the following steps: 1) the preparation of the capacitance type positive electrode, and preparation includes the preparation of a capacitance type positive electrode material, positive electrode mixing, coating and punching; 2) the preparation of a battery type negative electrode, the preparation includes the steps of preparing a battery type negative electrode material, mixing the negative electrode, coating and punching, 3) the preparation of the organic electrolyte, and 4) the assembly of the potassium ion hybrid capacitor, wherein the mass ratio of the positive electrode to the negative electrode is the optimal mass ratio obtained from different current densities, and the potassium ion hybrid capacitor has the characteristics of high energy density and high power density, and shows the application potential in the fields of braking devices, electric automobile energy supply, aerospace and the like.

Description

technical field [0001] The invention belongs to the field of hybrid capacitors, in particular to potassium ion hybrid capacitors. Background technique [0002] With the ever-increasing energy demands of HEVs and EVs, enormous efforts have been devoted to developing energy storage devices with both high energy density and high power density. Potassium-ion hybrid capacitors are composed of capacitive positive electrodes and battery-type negative electrodes. Because of their excellent characteristics of high energy in batteries and high power density in electric double layer capacitors, they have attracted extensive attention in the field of energy storage. Moreover, the abundant reserves of potassium resources (2.09wt%, ranking seventh in the earth's crust) make it have long-term economic value. However, the kinetic mismatch between battery-type anodes and capacitive-type cathodes and the difficulty in achieving charge / mass balance at all tested rates are significant challeng...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/32H01G11/34H01G11/36H01G11/40H01G11/62H01G11/84H01G11/86
CPCH01G11/24H01G11/32H01G11/34H01G11/36H01G11/40H01G11/62H01G11/84H01G11/86Y02E60/13
Inventor 刘继磊彭玉凡张睿
Owner HUNAN UNIV
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