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A kind of three-dimensional gradient metal hydroxide/oxide electrode material and its preparation method and application

A technology for hydroxides, electrode materials, applied in electrode fabrication, hybrid/electric double layer capacitor fabrication, nanotechnology for materials and surface science, etc. Problems such as poor cycle performance and rate performance

Active Publication Date: 2017-08-25
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal hydroxides and oxides have poor cycle performance and rate performance during charge and discharge due to their relatively poor electrical conductivity and ion kinetics, which limits their practical applications in energy devices.

Method used

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  • A kind of three-dimensional gradient metal hydroxide/oxide electrode material and its preparation method and application
  • A kind of three-dimensional gradient metal hydroxide/oxide electrode material and its preparation method and application
  • A kind of three-dimensional gradient metal hydroxide/oxide electrode material and its preparation method and application

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Embodiment 1

[0197] This embodiment provides a preparation method of a three-dimensional gradient metal hydroxide / oxide electrode material, comprising the following steps:

[0198] According to Ni 2+ :Co 2+ The molar concentration ratios are 1:0, 2:1, 1:1, 1:2, and 0:1, and 5 parts of nitrate solutions with a total concentration of metal ions of 0.01mol / L are prepared; the nickel foam is cut into 1×1cm 2 size, and ultrasonicated by 3mol / L hydrochloric acid solution for 10 minutes to remove the oxide film on the surface, and then washed three times with deionized water and absolute ethanol in sequence; the treated foamed nickel was used as the working electrode, saturated calomel and platinum As the reference electrode and the counter electrode respectively, the three-electrode system was assembled, and the constant current was 0.0005A on the CHI660E electrochemical workstation, followed by Ni 2+ :Co 2+ In the nitrate solution with a molar ratio of 1:0, 2:1, 1:1, 1:2, and 0:1, electrode...

Embodiment 2

[0226] This embodiment provides a preparation method of a three-dimensional gradient metal hydroxide / oxide electrode material, comprising the following steps:

[0227] According to Ni 2+ :Co 2+ The molar concentration ratios are 4:1, 3:1, 2:1, and 1:1 respectively, and four sulfate solutions with a total metal ion concentration of 0.02mol / L are prepared; the copper foam is cut into a diameter of 1.8 cm circular pole piece, and ultrasonicated with 3mol / L hydrochloric acid solution for 10 minutes to remove the oxide film on the surface, and then washed three times with deionized water and absolute ethanol in sequence; the treated foam copper was used as the working electrode, Saturated calomel and platinum sheets were used as reference electrode and counter electrode respectively, and a three-electrode system was assembled, and the constant current was 0.001A on the CHI660E electrochemical workstation, followed by 2+ :Co 2+ In the nitrate solution with a molar ratio of 4:1, 3...

Embodiment 3

[0230] This embodiment provides a preparation method of a three-dimensional gradient metal hydroxide / oxide electrode material, comprising the following steps:

[0231] According to Ni 2+ :Co 2+ The molar ratios are 4:1, 3:1, 2:1, and 1:1, and 4 chloride salt solutions with a total metal ion concentration of 0.02mol / L are configured; the copper foam is cut into a diameter of 1.8 cm circular pole piece, and ultrasonicated with 3mol / L hydrochloric acid solution for 10 minutes to remove the oxide film on the surface, and then washed three times with deionized water and absolute ethanol in sequence; the treated foam copper was used as the working electrode, Saturated calomel and platinum sheets were used as reference electrode and counter electrode respectively, and a three-electrode system was assembled, and the constant current was 0.001A on the CHI660E electrochemical workstation, followed by 2+ :Co 2+ In the nitrate solution with a molar ratio of 4:1, 3:1, 2:1, and 1:1, elec...

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Abstract

The invention provides a three dimensional gradient metal hydroxide / oxide electrode material and a manufacturing method and application thereof. The three dimensional gradient metal hydroxide / oxide electrode material consists of a conductive substrate and a metal compound layer, wherein the metal compound layer is arranged or formed on the surface of the conductive substrate, and the metal compound layer is made of metal hydroxide or oxide; the metal is transition metal, and the content of the metal ions in the metal compound layer decreases or increases in a gradient manner towards the conductive substrate. The three dimensional gradient metal hydroxide / oxide electrode material has the advantages of good cycling performance and good rate capability. The method for manufacturing the three-dimensional gradient metal hydroxide / oxide electrode material is easy and convenient, and the three dimensional gradient metal hydroxide / oxide electrode material can be used for manufacturing electrodes and batteries directly and shows good electrochemical activity.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular to a three-dimensional gradient metal hydroxide / oxide electrode material and its preparation method and application. Background technique [0002] With the continuous development of the world economy, more and more attention has been paid to green new energy, and new energy storage devices and energy conversion devices have become key technologies for human beings to make full use of new energy. Among them, electrochemical energy storage and conversion devices, such as supercapacitors, lithium-ion batteries, lithium-oxygen batteries, and metal-air batteries, have been widely studied. [0003] Supercapacitors have attracted more and more researchers' attention because of their advantages such as high energy density, fast charge and discharge, and long cycle life. However, the energy density of supercapacitors is still not high enough, which has become a key factor restr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/04H01G11/30H01G11/46H01G11/86B82Y30/00
CPCB82Y30/00H01G11/46H01G11/86H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 卢周广杨明阳
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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