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Preparation method and application of an aqueous high-voltage electrode material

A high-voltage electrode and water system technology, applied in the field of electrochemical energy storage, can solve the problems of low specific capacitance of the negative electrode, low voltage, high working voltage and high specific capacitance, etc., achieve high capacitance, high voltage window, and increase specific capacitance. Effect

Active Publication Date: 2020-08-04
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, it is also critical to prepare a corresponding high-voltage negative electrode, but the voltage of the currently prepared negative electrode materials is generally low, and the specific capacitance of the negative electrode is also low
How to prepare anode with high working voltage and high specific capacitance is still a challenge

Method used

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  • Preparation method and application of an aqueous high-voltage electrode material
  • Preparation method and application of an aqueous high-voltage electrode material
  • Preparation method and application of an aqueous high-voltage electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] a) The carbon cloth is ultrasonically cleaned with acetone, ethanol and deionized water in turn.

[0038] b) Prepare 40 mL of 2 mM Co(NO 3 ) 2 ·6H 2 O and 1 mM Zn(NO 3 ) 2 ·6H 2 Solution A of O, 40 mL of solution B containing 20mM 2-methylimidazole, mix A and B under stirring, immerse the carbon cloth obtained in step a) into the mixed solution for 4 hours, take it out and dry it, and then place it in the air at 350°C Calcined for 2 hours under the same conditions to obtain the carbon cloth / carbon nanowall array.

[0039] c) The carbon cloth / carbon nanowall array obtained in step b) was used as a working electrode, and immersed in 50 mL of 0.1 M Mn(CH 3 COO) 2 and 0.1 M Na 2 SO 4 In the electrodeposition solution, the Ag / AgCl electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. -1 The scanning speed was cycled for 2 cycles, then washed with deionized water, and dried at 60°C. Finally in saturated ...

Embodiment 2

[0043] a) The carbon cloth is ultrasonically cleaned with acetone, ethanol and deionized water in turn.

[0044] b) Prepare 40 mL of 2 mM Co(NO 3 ) 2 ·6H 2 O and 1 mM Zn(NO 3 ) 2 ·6H 2 Solution A of O, 40 mL of solution B containing 20mM 2-methylimidazole, mix A and B under stirring, immerse the carbon cloth obtained in step a) into the mixed solution for 8 hours, take it out and dry it, and then place it in the air at 500°C Calcined for 2 hours under the same conditions to obtain the carbon cloth / carbon nanowall array.

[0045] c) The carbon cloth / carbon nanowall array obtained in step b) was used as a working electrode, immersed in 50 mL of 0.5 M Mn(CH 3 COO) 2 and 0.2 M Na 2 SO 4 In the electrodeposition solution, the Ag / AgCl electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. -1 The scanning speed was cycled for 5 cycles, then washed with deionized water, and dried at 60°C. Finally in saturated Na ...

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Abstract

The invention discloses a preparation method of a water system high-voltage electrode material. The preparation method comprises the following steps: preparing carbon cloth / carbon nanometer wall withhigh conductivity and high specific surface as a base material; preparing Na0.5MnO2 nanosheet array through electrochemical deposition and electrochemical oxidation method; obtaining the carbon cloth / carbon nanometer wall / Na0.5MnO2 nanosheet positive material; preparing the carbon-clad porous VN nanosheet array through hydrothermal method and subsequent annealing; and obtaining the carbon cloth / carbon nanometer wall / carbon-clad porous VN nanosheet negative material. The above material is applied to preparing the asymmetric water system super capacitor. The working voltage of the asymmetric water system super capacitor prepared through the invention can achieve 2.6V, and the super capacitor has the energy density of 96.7 Whkg-1, excellent cyclic stability, and security, and an effective method is provided for designing and preparing the high-energy density super capacitor.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and relates to a preparation method and application of an aqueous high-voltage electrode material. Background technique [0002] As a new type of energy storage device, supercapacitors have attracted much attention due to their much higher power density compared to batteries, fast charge and discharge capabilities, extremely high life, wide temperature range, and environmental friendliness. However, its energy density is much lower than that of batteries, which greatly limits its application in various fields. Therefore, how to improve the energy density by designing high-efficiency electrode materials has become an urgent problem to be solved at this stage. [0003] The electrodes of a supercapacitor are divided into positive and negative electrodes. At present, most of the research work is focused on how to prepare pseudocapacitive cathode materials with high specific capacitance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/36H01G11/46H01G11/24H01G11/62H01G11/86
CPCY02E60/13
Inventor 袁凯黄俊陈义旺谈利承
Owner NANCHANG UNIV
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