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A kind of preparation method of binderless nickel cobalt oxide electrode

A binder-free, nickel cobalt oxide technology, applied in the field of electrochemistry, can solve the problems of poor quality control of nickel cobalt oxide in electrodes, reduced raw material utilization efficiency, difficult industrial application, etc., achieves good industrial application prospects, and improves the use of Efficiency, the effect of improving the specific capacitance

Active Publication Date: 2019-03-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of electrode material prepared by hydrothermal method will release toxic NO x gas, which makes it difficult for industrial applications
In addition, when the binderless nickel cobaltate electrode is prepared by the hydrothermal method, since the formation reaction of nickel cobaltate not only occurs on the surface of the current collector, but also occurs at any position in the mixed solution, the nickel and cobalt in the solution Only part of the ions can be converted into nickel cobaltate and deposited on the surface of the current collector, and some of them will form precipitates inside the solution to reduce the utilization efficiency of raw materials, and the quality of nickel cobaltate in the obtained electrode is not easy to control

Method used

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  • A kind of preparation method of binderless nickel cobalt oxide electrode

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] CoSO 4 ·6H 2 O and Na 2 SO 4 Dissolve in water to prepare a mixed solution containing 0.5 mol / L of cobalt sulfate and 2 mol / L of sodium sulfate.

[0034] Cut the carbon paper into an area of ​​4×1cm 2 Carbon paper strips were used as current collectors, which were ultrasonically washed with acetone, rinsed with water and dried. Use 4×4cm 2 The titanium mesh electrode coated with ruthenium oxide on the surface is the cathode, the above mixed solution is the electrodeposition solution, and the current collector after surface cleaning is the anode (the working area is 1×1cm 2 ) for constant current electrodeposition, the anode current density 1mA / cm 2 , the electrodeposition time is 1 minute, and a cobalt oxyhydroxide deposition layer is obtained.

[0035] Put the cobalt oxyhydroxide electrode prepared above into a stainless steel autoclave lined with polytetrafluoroethylene, inject a nickel sulfate solution with a concentration of 0.02mol / L, seal it and keep it war...

Embodiment 2

[0038]The operation process is the same as that in Example 1, except that the nickel cobalt oxide electrode obtained after the hydrothermal treatment is finished is subjected to electrodeposition-hydrothermal treatment again in the electrodeposition solution, and the process parameters related to electrodeposition and hydrothermal treatment are unchanged, and the electrode active material is measured. The specific capacitance is 918.6F / g.

Embodiment 3

[0040] The operation process is the same as in Example 1, except that the anode current density is 5mA / cm 2 , the electrodeposition time is 2 minutes, the concentration of nickel sulfate solution used for hydrothermal treatment is 0.5mol / L, the hydrothermal treatment temperature is 300°C, the treatment time is 25 hours, and the measured specific capacitance of the electrode active material is 868.9F / g .

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Abstract

The invention discloses a preparation method of a binderless nickel cobaltate electrode. The preparation method comprises the following steps: electrodepositing a cobalt oxyhydroxide deposition layer on a current collector through electrochemical anodic oxidation, and carrying out hydrothermal treatment for the cobalt oxyhydroxide layer in a nickel sulfate aqueous solution to ensure that the cobalt oxyhydroxide deposition layer on the surface of the current collector is totally converted to nickel cobaltate. A nickel-cobalt composite oxide electrode disclosed by the invention can be used for preparing electrochemical super-capacitors, and has the advantages of large overall energy density, small environmental influence, easy process control, energy conservation and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing a binder-free nickel cobaltate electrode. Background technique [0002] Electrochemical supercapacitors (ES), also known as electrochemical capacitors (EC), or simply supercapacitors (supercapacitors, ultracapacitors), are new energy storage devices that have attracted much attention in recent years. Because this type of capacitor mainly relies on the electrochemical process on the interface between the electrode and the solution to store energy, its capacity is 20 to 200 times that of traditional capacitors, reaching farads or even thousands of farads; its power density is dozens of times higher than that of batteries , which can meet the needs of high power output such as electric vehicle start-up acceleration. Electrochemical supercapacitors have the advantages of high power density of conventional capacitors and high energy density of recharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/46
CPCY02E60/13
Inventor 陈亚甘辉关杰豪陈白珍石西昌
Owner CENT SOUTH UNIV