Insect-shaped carbon material for supercapacitor and application of insect-shaped carbon material

A technology of supercapacitors and carbon materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, and can solve the problems of reducing surface area normalized capacitance, increasing cost, and incomplete charge shielding capacitance.

Active Publication Date: 2022-01-11
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the contradictory aspects between graphitization and nitrogen doping, how to improve the degree of graphitization of carbon materials while ensuring the nitrogen content, and what is the correlation between the type of nitrogen doping and the degree of graphitization remain to be solved. problem of inquiry
[0004] So far, various methods have been developed to improve the supercapacitive performance of carbon-based electrode materials, and most of the methods focus on increasing the specific surface area (SSA) of carbon materials. However, for carbon materials, studies have demonstrated When the specific surface area is higher than 1500 m 2 g -1 (BET SSA), mass specific capacitance ( C g , F g -1 ) vs. SSA curve will appear a plateau, that is to say when the BET SSA is higher than 1500 m 2 g -1 hour, C g no longer increases with SSA, which may be attributed to the steric constriction of charge hosts leading to incomplete charge screening and limited capacitance
In a sense, increasing SSA blindly increases the C g No benefit, but reduces the surface area normalized capacitance (C A = C g / S BET , µF cm −2 ) , and increases the cost

Method used

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  • Insect-shaped carbon material for supercapacitor and application of insect-shaped carbon material
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  • Insect-shaped carbon material for supercapacitor and application of insect-shaped carbon material

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preparation example Construction

[0036] The invention provides a kind of worm-like carbon material that supercapacitor is used, and its preparation method comprises the following steps:

[0037] (1) heating the mixture of melamine, formaldehyde and water to convert insoluble melamine molecules into its soluble methylol derivatives to obtain a prepolymer solution of melamine-formaldehyde resin polymer, which is solution A;

[0038] (2) Prepare a mixed solution containing emulsifier, silicon source and ferrous sulfate to obtain emulsion B;

[0039] (3) Add solution A to emulsion B under stirring, and stir the mixed system to obtain MF / silica / Fe 2+ Complex. The prepolymers of MF were cross-linked and aggregated around the surface of surfactant micelles to form MF capsules, while the silicon source was hydrolyzed into silica and incorporated into the clusters, resulting in a change in the surface morphology of the MF capsules. Ferrous sulfate is the key influencing factor for the formation of worm-like structur...

Embodiment 1

[0046] Add 9.45 g (75 mmol) of melamine and 15.0 mL (196 mmol) of formaldehyde solution (36 wt%) into 37.5 mL of deionized water and stir at 85 °C for 30 min to obtain a clear solution (referred to as solution A). Tetraethyl orthosilicate (15 mL, purity ≥99.9%), OP-10 (7.5 mL, 10 wt % aqueous solution) and 0.01 mol ferrous sulfate were mixed and stirred in deionized water for 60 ℃ in a water bath at 50 °C with magnetic stirring. minutes to obtain an olive green emulsion (named Emulsion B). The A solution was slowly added to B after cooling, after that, the pH of the mixture was adjusted to 4.5 by using HCl solution (2.0 M), and the mixture was continuously stirred for 2 h to obtain MF / SiO / Fe 2+ Complex. These composites were collected by filtration, washed repeatedly with water and ethanol three times, and dried in air at 80 °C. To prepare sample one, firstly the MF / SiO2 / Fe 2+ The composites were cured in air at 200 °C for 24 h, and then carbonized at 900 °C for 2 h in an a...

Embodiment 2

[0048] Add 9.45 g (75 mmol) of melamine and 15.0 mL (196 mmol) of formaldehyde solution (36 wt%) into 37.5 mL of deionized water and stir at 85 °C for 30 min to obtain a clear solution (referred to as solution A). Tetraethyl orthosilicate (15 mL, purity ≥99.9%), OP-10 (7.5 mL, 10 wt % aqueous solution) and 0.02 mol ferrous sulfate were mixed and stirred in deionized water for 60 ℃ in a water bath at 50 °C with magnetic stirring. minutes to obtain an olive green emulsion (named Emulsion B). The A solution was slowly added to B after cooling, after that, the pH of the mixture was adjusted to 4.5 by using HCl solution (2.0 M), and the mixture was continuously stirred for 2 h to obtain MF / SiO / Fe 2+ Complex. These composites were collected by filtration, washed repeatedly with water and ethanol three times, and dried in air at 80 °C. To prepare sample one, firstly the MF / SiO2 / Fe 2+ The composites were cured in air at 200 °C for 24 h, and then carbonized at 900 °C for 2 h in an a...

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Abstract

The invention relates to the field of electrochemical energy storage materials, in particular to an insect-shaped carbon material for a supercapacitor and application of the insect-shaped carbon material. According to the invention, a silicon source, ferrous sulfate and melamine-formaldehyde (MF) resin are respectively used as a pore-forming agent, a graphitization catalyst precursor and a carbon-nitrogen source, and the nitrogen-doped wormlike layered porous carbon with graphitization porous carbon convex particles is synthesized by a simple polymerization-induced colloid aggregation method and a coordination-pyrolysis combined process. The material is used as a novel supercapacitor electrode material. The material has some ideal characteristics of the carbon-based EDLC electrode material.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage materials, in particular to an insect-like carbon material for supercapacitors and an application thereof. Background technique [0002] Porous carbon materials refer to a class of materials with a certain pore structure and high specific surface area, and carbon as the main skeleton. Porous carbon materials have long dominated the field of energy storage due to their high electrical conductivity, good physical and chemical stability, rich microstructure and morphology, and low price. They can be used as a catalyst carrier or a very good electrode material itself. For example, commercial fuel cell electrocatalysts use carbon black to support noble metal platinum, while activated carbon is often used as an electrode material for supercapacitors. With the continuous advancement of technology, especially the rapid development of portable electronic devices and electric vehicles, traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/86H01G11/30H01G11/26
CPCH01G11/34H01G11/86H01G11/30H01G11/26Y02E60/13
Inventor 刘正陈小华肖逵逵马德崇
Owner HUNAN CITY UNIV
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