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Nickel-based electrode material and preparation method thereof

An electrode material, nickel-based technology, applied in the field of supercapacitor electrode materials, can solve the problems of reducing the cycle life of supercapacitors, weak bonding force between nickel-based active materials and current collectors, and falling off of active materials, and achieves reduced process, electrical conductivity, etc. Good performance and the effect of improving specific capacity

Inactive Publication Date: 2013-09-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electrode prepared by this method, the binding force between the nickel-based active material and the current collector is weak, and the active material is easily detached from the current collector during repeated charging and discharging, which reduces the cycle life of the supercapacitor.

Method used

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  • Nickel-based electrode material and preparation method thereof
  • Nickel-based electrode material and preparation method thereof
  • Nickel-based electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of nickel base electrode material, concrete steps are as follows:

[0031] (1) Sample preparation: soak the nickel sheet in acetone and clean it in an ultrasonic cleaning tank for 20 minutes, then soak the cleaned nickel sheet in absolute ethanol.

[0032] (2) Anodic oxidation of nickel sheet: configure anodic oxidation electrolyte, H in the solution 3 PO 4 The mass fraction of ammonium fluoride is 80wt%, the mass fraction of ammonium fluoride is 1wt%, the mass fraction of EDTA is 0.1wt%, the mass fraction of sodium citrate is 0.2wt%, and the balance is water (mass fraction is 18.7wt%). The pH of the electrolyte was adjusted to 1. Take out the nickel sheet soaked in absolute ethanol and dry it with a hair dryer. A nickel sheet was used as the anode, a stainless steel sheet was used as the cathode, and a saturated potassium chloride calomel electrode was used as the reference electrode. The anodic oxidation voltage was increased to 3.5V at...

Embodiment 2

[0037]A kind of preparation method of nickel base electrode material, concrete steps are as follows:

[0038] (1) Sample preparation: the same as in Example 1.

[0039] (2) Anodic oxidation of nickel sheet: configure anodic oxidation electrolyte, H in the solution 3 PO 4 The mass fraction of ammonium fluoride is 80wt%, the mass fraction of ammonium fluoride is 1wt%, the mass fraction of EDTA is 0.5wt%, the mass fraction of sodium citrate is 0.2wt%, and the balance is water (mass fraction is 18.3wt%). The pH of the electrolyte was adjusted to 1. Take out the nickel sheet soaked in absolute ethanol and dry it with a hair dryer. A nickel sheet is used as the anode, a stainless steel sheet is used as the cathode, and a saturated potassium chloride calomel electrode is used as the reference electrode. The anodic oxidation voltage is increased to 3V at a rate of 100mV / s, and then maintained at 3V for 40 minutes.

[0040] (3) post-processing: the same as in Example 1.

[0041] T...

Embodiment 3

[0043] A kind of preparation method of nickel base electrode material, concrete steps are as follows:

[0044] (1) Sample preparation: the same as in Example 1.

[0045] (2) Anodic oxidation of nickel sheet: configure anodic oxidation electrolyte, H in the solution 3 PO 4 The mass fraction of ammonium fluoride is 85wt%, the mass fraction of ammonium fluoride is 1wt%, the mass fraction of EDTA is 0.5wt%, the mass fraction of sodium citrate is 0.2wt%, and the balance is water (mass fraction is 13.3wt%). The pH of the electrolyte was adjusted to 0.5. Take out the nickel sheet soaked in absolute ethanol and dry it with a hair dryer. A nickel sheet is used as the anode, a stainless steel sheet is used as the cathode, and a saturated potassium chloride calomel electrode is used as the reference electrode. The anodic oxidation voltage is increased to 3.5V at a rate of 10mV / s, and then maintained at 3.5V for 15 minutes.

[0046] (3) post-processing: the same as in Example 1.

[0...

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Abstract

The invention belongs to the field of electrode materials of a supercapacitor, and discloses a nickel-based electrode material and a preparation method thereof. Fluorine-containing electrolyte is utilized for carrying out anodic oxidation on a nickel sheet; the anodic oxidation voltage is increased from 0V to 3-6.5V at a speed of 10mV / s to 500mV / s; then the voltage is maintained for 15-60 minutes; the nickel sheet is taken out for being cleaned and dried, so the nickel-based electrode material is obtained; and the electrolyte comprises fluoride of which the mass fraction is 0.5wt%-2wt%, phosphoric acid of which the mass fraction is 70wt%-85wt%, and the balance of water. The nickel-based electrode material and the preparation method thereof disclosed by the invention have the characteristics that 1) a nickel-based film which is generated by using the anodic oxidation method is combined with the nickel sheet firmly, and good electroconductibility is realized; 2) a conductive additive or a binder is not needed to be additionally added, the preparation process of the supercapacitor is simplified, and the preparation cost is lowered; and 3) the material still has very high specific capacitance under the condition of large charging and discharging current densities.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode materials, and relates to a preparation method of a nickel-based electrode material—an anodic oxidation method. Background technique [0002] Supercapacitor (also known as electrochemical capacitor) is a new type of energy storage element with energy density and power density between traditional capacitors and secondary batteries. Due to the advantages of high power and long cycle life, supercapacitors have been widely used in electronic equipment and new energy fields. According to the different energy storage mechanisms of electrode materials, supercapacitors can be divided into: 1) Electric Double Layer Capacitor (EDLC), which uses the electric double layer at the interface between the electrode and the electrolyte to store charges; 2) Pseudocapacitor (Redox Capacitor), which uses electrochemically active substances to undergo adsorption, desorption, or electrochemical redox reactions i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30
CPCY02E60/13
Inventor 张果戈金敏李文芳黄海涛
Owner SOUTH CHINA UNIV OF TECH
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