Self-collecting supercapacitor electrode material and preparing method thereof

A technology of supercapacitors and electrode materials, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology, etc., can solve the problem of direct use of b-nickel hydroxide supercapacitor electrode materials, use of chemical reagents, and easy pollution and other problems, to achieve the effect of easy mass preparation and industrial production, low cost, and zero pollution

Active Publication Date: 2014-04-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can prepare b-nickel hydroxide, there are many problems in the preparation process, such as the use of chemical reagents, the need for follow-up treatment, and cumbersome procedures, the preparation cost is high and it is easy to cause pollution; and the b-nickel hydroxide prepared by these methods cannot be used as Supercapacitor electrode materials are used directly, and additional current collectors, conductive additives, and binders are required to be obtained through a complex electrode preparation process.

Method used

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  • Self-collecting supercapacitor electrode material and preparing method thereof
  • Self-collecting supercapacitor electrode material and preparing method thereof
  • Self-collecting supercapacitor electrode material and preparing method thereof

Examples

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Effect test

Embodiment 1

[0019] Divide the area to 2cm 2 The cleaning foam nickel is immersed in a 60cm 3 , 15% (mass percent concentration) hydrogen peroxide solution reaction kettle, seal the reaction kettle and place it in an oven at 180°C for 24 hours, then cool to room temperature, take out the foamed nickel, rinse the foamed nickel with pure water, and then Put it in a vacuum oven at 60°C and dry it for 5 hours to obtain the current collector electrode material. from figure 1 with figure 2 The results show that the self-collecting electrode material is composed of nickel foam current collector and b-nickel hydroxide (hexagonal structure) hexagonal nanosheets grown in situ on its surface. from Figure 3~6 The performance test results show that the self-collecting electrode material has a small electrode impedance and a high electron transfer rate, a large specific volume, good cycle stability, and a specific volume greater than 1000 F / g at a scan rate of 5mV / s. The specific capacity retenti...

Embodiment 2

[0021] Divide the area to 1cm 2 The cleaning foam nickel is immersed in a 50cm 3 , 10% (mass percent concentration) hydrogen peroxide solution in the reaction kettle, seal the reaction kettle and place it in an oven at 200 ° C for 20 hours, then cool to room temperature, take out the foamed nickel, rinse the foamed nickel with pure water, and then Dry it in a vacuum oven at 70°C for 4 hours to obtain a self-collecting electrode composed of a nickel foam current collector and b-nickel hydroxide (in a hexagonal structure) hexagonal nanosheets grown in situ on its surface Material. The self-collecting electrode material has very small electrode impedance and high electron transfer rate, large specific volume and good cycle stability. The specific capacity retention after 2000 cycles at the scan rate is over 95%.

Embodiment 3

[0023] Divide the area to 3cm 2 The cleaning foam nickel is immersed in a 30cm 3 , 5% (mass percent concentration) hydrogen peroxide solution in a reaction kettle, seal the reaction kettle and place it in an oven at 240°C for 10 hours, then cool to room temperature, take out the foamed nickel, rinse the foamed nickel with pure water, and then Dry in a vacuum oven at 80°C for 3 hours to obtain a self-collecting electrode composed of a nickel foam current collector and b-nickel hydroxide (in a hexagonal structure) hexagonal nanosheets grown in situ on its surface Material. The self-collecting electrode material has very small electrode impedance and high electron transfer rate, large specific volume and good cycle stability. The specific capacity retention after 2000 cycles at the scan rate is over 95%.

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Abstract

The invention provides a self-collecting supercapacitor electrode material and a preparing method thereof. The electrode material is composed of a foamed nickel current collector and a b-nickel hydroxide hexagonal nanosheet grown on the surface of the foamed nickel current collector in an in-situ mode. According to the preparing method of the electrode material, the conductive current collector foamed nickel is immersed into a hydrogen peroxide solution for low-temperature hydrothermal oxidation, and then the b-nickel hydroxide hexagonal nanosheet is directly grown on the conductive current collector in the in-situ mode. The electrode material has the advantages of being large in specific volume and good in circulating stability. Due to the fact that the active material nickel hydroxide is directly grown on the foamed nickel current collector, the electrode material can be used directly without extra current collectors, or conductive additives or binding agents, complicated electrode preparing processes are omitted, and self-collecting is achieved. The electrode material preparing method only relates to the cheap hydrogen peroxide solution, other chemical reagents are not needed, and then zero pollution and low cost are guaranteed. The preparing processes only relate to hydrothermal oxidation and vacuum drying, operation is easy and convenient, reproducibility is good, and bulk preparation and industrialized production are facilitated.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode materials, and in particular relates to a self-collecting supercapacitor electrode material and a preparation method thereof. Background technique [0002] Supercapacitors are a new type of green energy storage device between batteries and traditional capacitors. They have the advantages of high power density, short charging time, and long cycle life. They are widely used as driving power for electric vehicles and backup power for mobile communication equipment. wait. The performance of supercapacitors mainly depends on their electrode materials. Commonly used supercapacitor electrode materials mainly include carbon materials, transition metal (hydr) oxides, and some conductive polymers, among which nickel hydroxide material is considered to be an ideal electrode material because of its high pseudocapacitance and good reversibility. . Nickel hydroxide has two structure types, a and b. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86B82Y40/00
CPCY02E60/13
Inventor 雷惊雷李凌杰徐静张跃忠张洁张嘉芮
Owner CHONGQING UNIV
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