A supercapacitor electrode material having a large working potential window and a preparation method thereof

A technology for supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of small working potential window, complex process and high production cost, and achieves overcoming bottleneck value and stability. Good, low cost effect

Active Publication Date: 2019-01-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working potential window of nickel hydroxide composite materials is still not large, generally limited to within 0.55V; and there are usually problems such as complex process, difficult mass production and high production cost.

Method used

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  • A supercapacitor electrode material having a large working potential window and a preparation method thereof
  • A supercapacitor electrode material having a large working potential window and a preparation method thereof
  • A supercapacitor electrode material having a large working potential window and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare as follows:

[0024] (1) Set 90PPI and surface density to 220g / m 2 1. 1.6mm thick nickel foam, when the pressure is 1MPa, the pressure holding time is 1min, and then placed in 5% dilute hydrochloric acid to ultrasonically clean for 5min, and then alternately washed with dehydrated and absolute ethanol three times each, and placed in a vacuum oven at 50°C Drying in medium for 12h to obtain foamed nickel substrate;

[0025] (2) Place the foamed nickel substrate obtained in step (1) in a stainless steel kettle with polytetrafluoroethylene as the inner liner, and conduct a hydrothermal reaction for 8 hours at a water-to-air volume ratio of 7:3 and 180°C. After washing with water, After drying in air at 80°C for 6 hours, the morphology of the nickel foam substrate was obtained as follows: figure 1 The material of the array of hexagonal nickel hydroxide flakes shown in the SEM image of ;

[0026] (3) the nickel foam obtained in step (2) is the material of the hexag...

Embodiment 2

[0031] Prepare as follows:

[0032] (1) Set 110PPI and surface density to 320g / m 2 1.8mm thick nickel foam, when the pressure is 1MPa, the pressure holding time is 2min, and then placed in 5% dilute hydrochloric acid to ultrasonically clean for 5min, and then alternately washed with dehydrated and absolute ethanol three times each, and placed in a vacuum oven at 50°C Drying in medium for 12h to obtain foamed nickel substrate;

[0033] (2) Place the foamed nickel substrate obtained in step (1) in a stainless steel kettle with polytetrafluoroethylene as the inner liner, and perform a hydrothermal reaction for 16 hours at a water-to-air volume ratio of 3:2 and 185°C. After washing with water, Dry in air at 80°C for 6 hours to obtain the material of hexagonal nickel hydroxide flake array based on nickel foam;

[0034] (3) the foamed nickel obtained in the step (2) is the material of the hexagonal nickel hydroxide sheet array as the base as the working electrode, the platinum sheet...

Embodiment 3

[0039] Prepare as follows:

[0040] (1) Set 110PPI and surface density to 320g / m 2 1.8mm thick nickel foam, when the pressure is 1MPa, the pressure holding time is 2min, and then placed in 5% dilute hydrochloric acid to ultrasonically clean for 5min, and then alternately washed with dehydrated and absolute ethanol three times each, and placed in a vacuum oven at 50°C Drying in medium for 12h to obtain foamed nickel substrate;

[0041] (2) Place the foamed nickel substrate obtained in step (1) in a stainless steel kettle with polytetrafluoroethylene as the liner, and perform a hydrothermal reaction for 24 hours at a water-to-air volume ratio of 4:1 and 175°C. After washing with water, Dry in air at 100°C for 6 hours to obtain a hexagonal nickel hydroxide flake array material based on nickel foam;

[0042] (3) the foamed nickel obtained in the step (2) is the material of the hexagonal nickel hydroxide sheet array as the base as the working electrode, the platinum sheet of equa...

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Abstract

The invention provides a supercapacitor electrode material and a preparation method thereof. A composite material with a core-shell structure formed by taking a hexagonal sheet-shaped specific crystalline nickel hydroxide as a core and a porous sheet-shaped specific crystalline manganese dioxide as a shell is arranged on the surface of a base material of a foamed nickel,. Electrode material was prepared by electrodeposition of manganese dioxide layer on foamed nickel substrate after hydrothermal reaction is performed to obtain nickel hydroxide. The supercapacitor electrode material is composedof two special crystalline forms of nickel hydroxide and manganese dioxide, which are combined on the porous material. The working electrode is tested by three-electrode system. The potential windowwidth of the working electrode is up to 1V, which is about 70% higher than the potential window of 0.4-0.6 V of the existing electrode materials. The synthesis method is simple, quick, green and environmental friendly, and the cost is low.

Description

technical field [0001] The invention relates to an electrode material and a preparation method, in particular to a supercapacitor electrode material and a preparation method. Background technique [0002] As an ideal supercapacitor electrode material, nickel hydroxide electrode material has the characteristics of high theoretical specific capacity and low cost. However, nickel hydroxide electrodes usually have common problems such as small working potential window, poor rate performance and low cycle life in aqueous electrolyte. Combining nickel hydroxide with other materials with large operating potential window and high conductivity is a common improvement strategy. For example, literature (Wang H, Casalongue H S, Liang Y, et al. Ni(OH) 2 Nanoplates grown on graphene as advanced electrochemical pseudocapacitormaterials.[J].Journal of the American Chemical Society, 2010,132(21):7472-7477.) grow highly crystalline nickel hydroxide nanosheets on graphene sheets with low oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/30H01G11/46H01G11/86
CPCH01G11/24H01G11/26H01G11/30H01G11/46H01G11/86Y02E60/13
Inventor 夏笑虹马倩刘洪波
Owner HUNAN UNIV
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