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In-situ preparation method of high-energy-density cobalt hydroxide thin film electrode

A high energy density, cobalt hydroxide technology, applied in the direction of alkaline battery electrodes, etc., to achieve the effects of easy operation, easy recovery and low production cost

Inactive Publication Date: 2018-04-20
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad are focusing on the development of pseudocapacitive materials based on alkaline aqueous solution systems. Although this material can solve the problem of battery power density, it needs to be greatly improved in terms of energy density.

Method used

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  • In-situ preparation method of high-energy-density cobalt hydroxide thin film electrode
  • In-situ preparation method of high-energy-density cobalt hydroxide thin film electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, the commercial nickel foam substrate is cleaned with deionized water and ethanol to remove dust and oil to obtain a clean nickel surface; secondly, a metal cobalt layer is electrodeposited on the surface of the nickel foam by electroplating technology, and the thickness of the cobalt coating is controlled at 20 microns; Then, prepare KOH alkaline electrolyte, the concentration of KOH is 6mol / L; then, immerse the cleaned cobalt-plated electrode in the configured electrolyte solution, and pass constant current step-(current density: 50mA / cm 2 ) technology to continuously activate the electrode surface to obtain a cobalt hydroxide thin film electrode with high energy density.

[0018] like figure 1 As shown, it can be seen that the prepared film material is uniformly distributed. like figure 2 As shown, it can be seen that the thin film electrode exhibits a high energy density.

Embodiment 2

[0020] First, the commercial nickel foil substrate was cleaned with deionized water and ethanol to remove dust and oil to obtain a clean nickel surface; secondly, a metal cobalt layer was electrodeposited on the nickel surface by electroplating technology, and the thickness of the cobalt coating was controlled at 1 micron; then , prepare NaOH alkaline electrolyte, the concentration of NaOH is 10mol / L; then, immerse the cleaned cobalt-plated electrode in the configured electrolyte solution, and pass the constant current step (current density: -50mA / cm 2 ~+50mA / cm 2 ) technology to continuously activate the electrode surface to obtain a cobalt hydroxide thin film electrode with high energy density.

Embodiment 3

[0022] First, the commercial stainless steel mesh substrate is cleaned with deionized water and ethanol to remove dust and oil to obtain a clean stainless steel surface; secondly, a metal cobalt layer is deposited on the surface of the stainless steel mesh by electroplating technology, and the thickness of the cobalt coating is controlled at 1 micron; Then, prepare NaOH+KOH alkaline electrolyte, the concentration of NaOH is 4mol / L, and the concentration of KOH is 2mol / L; then, the cleaned cobalt-plated electrode is immersed in the configured electrolyte solution, through a constant potential step ( Step potential difference>1V) technology to continuously activate the surface of the electrode can obtain a cobalt hydroxide thin film electrode with high energy density.

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Abstract

Disclosed is an in-situ preparation method of a high-energy-density cobalt hydroxide thin film electrode. The preparation method comprises the main steps of (1) performing cleaning, dust removing andoil removing on a metal current collector to obtain a cleaned surface; (2) performing electro-depositing of a metal cobalt layer on the surface of the current collector through an electroplating technology, and controlling the thickness of a cobalt plated layer to be 1-20 microns; (3) configuring an electrolyte solution used for in-situ preparation, taking deionized water as a solvent, and takingmetal alkali as the main component of a solute; and (4) enabling a cleaned cobalt-plated electrode to be immersed into the configured electrolyte solution, and performing continuous activation on thesurface of the electrode through an electrochemical oxidization-reduction technology to obtain the high-energy-density cobalt hydroxide thin film electrode. The preparation method is simple in process, easy to operate and low in production cost; and the prepared thin film electrode has high energy storage activity in an alkali system, the raw materials can be recycled easily, and industrial production can be carried out suitably.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of an electrode material. Background technique [0002] Environmental pollution caused by the excessive discharge of pollutants from non-renewable energy sources such as fossil fuels has become a major problem that needs to be solved urgently in the current society. Since electric energy is used as an energy source and does not produce pollutant emissions, it is used as a clean energy source, which is expected to alleviate the problem of environmental pollution. Based on this background, as a device for storing electric energy—the power supply is indispensable in the use of electric energy, so it plays an increasingly important role, such as in electric vehicles (electric vehicles, electric vehicles), small mobile devices (mobile phones, Notebook), industrial emergency power supply and other fields. The batteries that can be widely used at...

Claims

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Application Information

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IPC IPC(8): H01M4/29
CPCH01M4/29Y02E60/10
Inventor 樊玉欠王慧娟董月王璐萌武迎华曾磊李子轩张文波
Owner YANSHAN UNIV