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In-situ preparation method and application of electrode of electrochemical capacitor

A capacitor electrode, in-situ preparation technology, applied in the hybrid capacitor electrode, hybrid/electric double layer capacitor manufacturing and other directions, can solve the problems of increasing the internal resistance of the electrode material, losing the specific surface area of ​​the active material, and reducing the utilization rate of the active material.

Active Publication Date: 2018-11-13
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on electrode materials for supercapacitors mainly focuses on the research of nanomaterials. However, these nanoactive materials with large specific surface areas are mostly powders, which require stable, Uniform loading on the conductive substrate requires not only the addition of conductive agents and organic binders, but also the need to press into electrodes under a pressure higher than 5MPa. This process will not only lose part of the specific surface area of ​​the active material, but also reduce the active material. The utilization rate increases the internal resistance of the electrode material, and it is difficult to evenly coat the active material on the conductive agent; in addition, the process of coating the powder on the conductive substrate is also very cumbersome.
These above-mentioned problems are still practical problems that are difficult to overcome when assembling supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Put nickel foam (G-Ni) in 10% (wt%) sodium carbonate solution at 50 o C for 30 min, and then rinsed with a large amount of water to obtain the cleaned G-Ni; then, using G-Ni as the working electrode, saturated calomel (SCE) as the reference electrode, and platinum as the counter electrode, at 1 mol· L -1 In the NaOH solution, in the potential range of 0.1 ~ 0.6 V (vs SCE), at a scan rate of 100 mV s -1 After repeating the scanning cycle 200 times, the G-Ni was soaked in water, and then dried in the air at room temperature to obtain a nano-surfaced nickel foam (nano-G-Ni).

[0017] (2) Add 0.1 g nickel acetate, 0.1 g cobalt acetate, 0.2 g glucose, and 2.5 g dicyandiamide into 35 mL of water, and stir until the solids are completely dissolved to form a homogeneous solution (referred to as the precursor solution); then the above nano -G-Ni was immersed in the precursor solution and kept under slow stirring for 1 min, then the nano-G-Ni was taken out, dried in the hot...

Embodiment 2

[0025] Step (1) is the same as step (1) in Example 1.

[0026] (2) Add 0.1 g nickel acetate, 0.1 g cobalt acetate, 0.2 g glucose, and 2.5 g dicyandiamide into 35 mL of water, and stir until the solids are completely dissolved to form a homogeneous solution (referred to as the precursor solution); then the above nano -G-Ni was immersed in the precursor solution and kept under slow stirring for 1 min, then the nano-G-Ni was taken out, dried in the hot air flow for 5 min, then immersed in the precursor solution, kept under slow stirring for 1 min, Then the nano-G-Ni was taken out and dried in air for 5 min; this immersion / drying process was repeated 10 times to obtain the precursor-loaded nano-G-Ni;

[0027] Steps (3), (4), and (5) are the same as steps (3), (4), and (5) of Example 1, respectively.

[0028] The measurement result is:

[0029] The current is 1 A g -1 and 2 A g -1 The specific capacitance at the time is 1033 F·g -1 and 896 F g -1 ;

[0030] The specific capa...

Embodiment 3

[0032] Step (1) is the same as step (1) in Example 1.

[0033] (2) Add 0.1 g nickel acetate, 0.1 g cobalt acetate, 0.2 g glucose, and 2.5 g dicyandiamide into 35 mL of water, and stir until the solids are completely dissolved to form a homogeneous solution (referred to as the precursor solution); then the above nano -G-Ni was immersed in the precursor solution and kept under slow stirring for 1 min, then the nano-G-Ni was taken out, dried in the hot air flow for 5 min, then immersed in the precursor solution, kept under slow stirring for 1 min, Then the nano-G-Ni was taken out and dried in air for 5 min; this immersion / drying process was repeated 20 times to obtain the precursor-loaded nano-G-Ni;

[0034] Steps (3), (4), and (5) are the same as steps (3), (4), and (5) of Example 1, respectively.

[0035] The measurement result is:

[0036] The current is 1 A g -1 and 2 A g -1 The specific capacitance at the time is 978 F·g -1 and 706 F g -1 ;

[0037] The specific capac...

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Abstract

The invention discloses an in-situ preparation method of an electrode of an electrochemical capacitor. The method comprises the following steps: nickel foam is taken as a conductive substrate, and thesurface of the nickel foam is nanocrystallized through electrochemical cyclic voltammetry firstly; then the nickel foam is immersed into a mixed precursor solution containing nickel salt, cobalt salt, glucose and dicyandiamide, dried and pyrolyzed at high temperature, and hollow nanocarbon tubes (NiCoN-C / nano-G-Ni) supported on the nickel foam and doped with nickel-cobalt-nitrogen are obtained; NiCoN-C / nano-G-Ni is immersed into a manganese acetate solution at 40 DEG C and a potassium permanganate solution at 80 DEG C sequentially, dried and subjected to heat treatment at 250 DEG C, manganesedioxide is firmly inlaid in the surfaces of the hollow carbon tubes, and a manganese dioxide / nickel cobalt nitrogen-hollow carbon tube compound MnO2 / NiCoN-C / nano-G-Ni with the nickel foam as the substrate is obtained and can serve directly as an electrode material of an electrochemical supercapacitor. Troublesome common preparation steps for the electrode material are reduced, the problems of performance degradation of an active material and the like are solved, and the material has great practical application significance.

Description

technical field [0001] The invention belongs to the field of novel electrochemical energy materials, and in particular relates to an in-situ preparation method and application of electrochemical capacitor electrode sheets. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of electrochemical energy storage device. In principle, it is between conventional capacitors and secondary batteries. Therefore, supercapacitors have the characteristics of large power density of conventional capacitors. , At the same time, it also has the advantage of high energy density of the secondary battery. In addition, as a new type of energy storage device, supercapacitors also have the characteristics of no pollution to the environment, high efficiency, long cycle life, wide operating temperature range, and high safety. Due to the unique advantages of supercapacitors, it has broad application prospects in new energy power generation, electric ve...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/24
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 易清风杨孝昆陈瑶
Owner HUNAN UNIV OF SCI & TECH
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