Method for preparing cobalt hydroxide/nickel hydroxide supercapacitor electrode based on metal titanium mesh substrate with high-conductivity ceramic surface film

A supercapacitor and ceramic surface technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of not meeting the application requirements, large capacity loss, poor rate performance, etc., and achieve simplified preparation and electrode assembly process , Improve the surface properties, improve the effect of binding ability

Inactive Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrode prepared by this process still has high electrochemical polarization, and the highest working current density is only 10-50A.g -1 , and the capacity loss is large and the utilization rate is low (<50%)
In addition, the surface of most metal current collectors such as nickel, copper, and stainless steel is easily oxidized, forming a semiconductor oxide film with a certain thickness, which reduces the conductivity of the metal current collector. For example, after depositing nickel hydroxide or cobalt hydroxide directly on the surface of nickel foam , due to the poor conductivity of the nickel oxide layer on the surface of nickel foam, its rate performance is poor, which cannot meet the application requirements of supercapacitor electrodes; and the metal without oxide film on the surface has high surface activity and good conductivity, but because of The interface compatibility with the active material is poor. Nickel hydroxide, cobalt hydroxide, etc. cannot be deposited tightly on the metal surface with high conductivity. For example, on the surface of stainless steel, the active material is difficult to attach firmly, resulting in the electrochemical process. fall off

Method used

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  • Method for preparing cobalt hydroxide/nickel hydroxide supercapacitor electrode based on metal titanium mesh substrate with high-conductivity ceramic surface film
  • Method for preparing cobalt hydroxide/nickel hydroxide supercapacitor electrode based on metal titanium mesh substrate with high-conductivity ceramic surface film
  • Method for preparing cobalt hydroxide/nickel hydroxide supercapacitor electrode based on metal titanium mesh substrate with high-conductivity ceramic surface film

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Experimental program
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Effect test

Embodiment 1

[0032] The titanium mesh used was subjected to reduction treatment at 900°C for 4 hours in a pure hydrogen atmosphere. The electrode size was 2.5cm×1.0cm. 0.1M nickel nitrate solution was used as the deposition electrolyte, and 1M KOH solution was used as the electrochemical test electrolyte. The three-electrode system uses titanium mesh as the working electrode, platinum sheet as the counter electrode, and Ag / AgCl as the reference electrode. The method of constant current cathodic polarization is adopted, and the current density is 1-25mA / cm 2 , the prepared deposition amount is 0.12mg / cm 2 Nickel hydroxide / titanium mesh electrode. The scanning electron microscope photos show that nickel hydroxide is evenly distributed on the titanium mesh, and has various shapes such as porous flower-like structure and granular shape. The results of cyclic voltammetry show that the composite material has small electrode polarization and high reversibility. Calculated from the charge and di...

Embodiment 2

[0035] The titanium mesh used was in a hydrogen / acetylene mixed atmosphere (P C2H4 :P H2 =0.02), after 1000°C reduction treatment for 2 hours, the electrode size is 2.5cm×1.0cm, 0.025M cobalt nitrate solution is prepared as deposition electrolyte, and 1M KOH solution is prepared as electrochemical test electrolyte. Using a three-electrode system with titanium mesh as the working electrode, platinum sheet as the counter electrode, and Ag / AgCl as the reference electrode, the method of constant current cathodic polarization is adopted, and the current density is 2mA / cm 2 , the reaction time is 200s, and the deposition amount is 0.24mg / cm 2 cobalt hydroxide / titanium mesh electrode. Scanning electron microscope observation shows that cobalt hydroxide is evenly distributed on the titanium mesh and has a porous flower-like structure. The results of cyclic voltammetry and charge-discharge show that the composite material has high reversibility. Calculated from the cyclic voltammet...

Embodiment 3

[0037] The unreduced titanium mesh and the titanium mesh (both specifications are 2.5cm×1.0cm) that have been reduced at 900°C for 4 hours in a pure hydrogen atmosphere were used as electrode collectors, and the method of constant current cathodic polarization was adopted. The density is 1mA / cm 2 , in 0.1M nickel nitrate solution, the electrolytic preparation deposition amount is 0.12mg / cm 2 Nickel hydroxide / titanium mesh electrode. Using 1M KOH solution as the electrolyte, platinum sheet as the counter electrode, and Ag / AgCl as the reference electrode, the three-electrode system was used for cyclic voltammetry scanning and electrochemical capacity testing. It was found that the unreduced titanium mesh has almost no capacity, while the reduced electrode has good electrochemical activity, and its specific capacity is about 2200F / g calculated according to the CV area integral. Calculation basis: where C m (F / g) specific capacity, Q + (C) and Q - (C) are the integrated ele...

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Abstract

The invention discloses a method for preparing a cobalt hydroxide/nickel hydroxide supercapacitor electrode based on a metal titanium mesh substrate with a high-conductivity ceramic surface film. According to the method, a metal titanium mesh is subjected to reduction treatment to generate a conductive titanium black film layer on the surface of the metal titanium mesh so as to obtain the metal titanium mesh substrate with the conductive titanium black surface film; and nanometer nickel hydroxide or nanometer cobalt hydroxide is deposited on the surface of the metal titanium mesh substrate with the conductive titanium black surface film through a constant current negative electrode electrodeposition method to obtain the cobalt hydroxide/nickel hydroxide supercapacitor electrode. The preparation is simple to operate and the cost is low, and the cobalt hydroxide or the nickel hydroxide active material and the metal titanium mesh current collector are tightly combined in the prepared electrode; the active materials are uniform in distribution; in addition, the electrode has a multiple nano-structured morphology; and the electrochemical performance is obviously better than that of nickel hydroxide or cobalt hydroxide deposited on other substrate.

Description

technical field [0001] The invention relates to a preparation method of a cobalt hydroxide or nickel hydroxide supercapacitor electrode, in particular to a method for preparing a cobalt hydroxide or nickel hydroxide supercapacitor electrode using a metal titanium mesh with a highly conductive ceramic surface film as a conductive current collector The preparation method belongs to the field of supercapacitor electrode preparation. Background technique [0002] In recent years, as a new type of energy storage device, supercapacitors have quickly entered people's minds because they have many characteristics of batteries and traditional electrostatic capacitors, such as large specific energy, fast charging, long cycle life, small size, low cost, and safe operation. vision. According to the energy storage mechanism, supercapacitors are divided into electric double layer capacitors and pseudocapacitors. Porous carbon materials with high conductivity and high specific surface are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86
CPCY02E60/13H01G11/30H01G11/86
Inventor 伍秋美桑商斌钟文洁吴榆
Owner CENT SOUTH UNIV
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