Carbon-based electrode material having super high specific capacitance and combined electrode material thereof

An electrode material, specific capacitance technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of poor stability, low power density, and can not fully display the energy storage characteristics of super electrode materials.

Active Publication Date: 2016-06-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material reported in the literature has two fatal problems: one is that the introduction of doping elements will significantly reduce the conductivity of the material; the other is that the proportion of Faraday capacitance produced by doping elements is very low (typically less than 10% ), the main reason is that there are a large number of doping active centers that cannot be effectively utilized
Although Faraday capacitors (such as polymers, transition metal oxides, etc.) can obtain high specific capacitance through redox reactions during charge and discharge, they are poor in stability (capacitance retention

Method used

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  • Carbon-based electrode material having super high specific capacitance and combined electrode material thereof
  • Carbon-based electrode material having super high specific capacitance and combined electrode material thereof
  • Carbon-based electrode material having super high specific capacitance and combined electrode material thereof

Examples

Experimental program
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Example Embodiment

[0114] Example 1 Mesoporous nitrogen-doped carbon-based material

[0115] An aqueous solution with a concentration of 0.1 mol / L nickel nitrate is prepared and mixed with commercial mesoporous silica SBA-15 at a mass ratio of nickel to silica of 1:2. Stir and disperse ultrasonically, vacuumize to a pressure of 20 Pa, and form a sol after the solution is volatilized. In an argon atmosphere containing 5% hydrogen, the temperature is increased to 450°C and kept for 2 hours to obtain mesoporous silica (SBA-15 / Ni) filled with metallic nickel;

[0116] Take the carbon source polyfurfuryl alcohol and aminoguanidine dissolved in ethanol at a ratio of 5:1, add SBA-15 / Ni, ultrasonically disperse for 30 minutes, and dry at 100°C for 10 hours to obtain SBA-15 / Ni / polyfurfuryl alcohol / aminoguanidine Xerogel

[0117] Place 50 grams of the above sample in an atmosphere furnace, heat up to 900°C in argon or nitrogen, and pass in hydrogen, ammonia, and methane at a ratio of 20:15:10 sccm, and hold fo...

Example Embodiment

[0136] Example 2 Mesoporous nitrogen-doped graphene with different redox potentials

[0137] The preparation method of obtaining the mesoporous silica (SBA-15 / Ni) filled with metallic nickel is exactly the same as that of Example 1;

[0138] The carbon source polyfurfuryl alcohol and aminoguanidine were dissolved in ethanol at the ratios of 5:1 (i.e. Example 1), 2:1, and 1:1. SBA-15 / Ni was added and dispersed by ultrasonic for 30 minutes at 100°C. Dry for 10 hours to obtain three sets of SBA-15 / Ni / polyfurfuryl alcohol / aminoguanidine xerogels;

[0139] Take 50 grams of each of the above samples and place them in an atmosphere furnace, heat up to 900°C in argon or nitrogen, and pass in hydrogen, ammonia and methane at a ratio of 20:15:10 sccm, and hold for 10-30 minutes. Cool to room temperature and take out the sample;

[0140] The sample obtained above was immersed in a mixed solution of hydrochloric acid and hydrofluoric acid, filtered and washed with a large amount of deionized wat...

Example Embodiment

[0145] Example 3 Mesoporous boron-doped carbon-based material

[0146] The preparation of mesoporous silica (SBA-15 / Ni) filled with metallic nickel is the same as that of Example 1;

[0147] Take the carbon source polyfurfuryl alcohol (PFA) and boron tribromide (BBr 3 ) Dissolve in ethanol at a ratio of 5:2, add SBA-15 / Ni, ultrasonically disperse for 30 minutes, and dry at 100°C for 10 hours to obtain SBA-15 / Ni / PFA / BBr 3 Xerogel

[0148] Place 50 grams of the above sample in an atmosphere furnace, heat up to 800°C in argon or nitrogen, and pass in hydrogen and methane at a ratio of 20:10 sccm, and hold for 10-30 minutes. Cool to room temperature and take out the sample;

[0149] The sample obtained above was immersed in a mixed solution of hydrochloric acid and hydrofluoric acid, filtered and washed with a large amount of deionized water and ethanol after 24 hours. The boron-doped mesoporous doped graphene obtained after drying;

[0150] The characterization and electrochemical test o...

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Abstract

The invention relates to a carbon-based electrode material having super high specific capacitance and a combined electrode material thereof. Capacitance of the carbon-based electrode material comprises two parts, including double-electric-layer capacitance and Faradaic pseudo capacitance, the double-electric-layer capacitance is 20-60% of the capacitance of the carbon-based electrode material, the specific capacitance of the carbon-based electrode material under the 1A/g current density is more than 400, the volume specific capacitance is more than 300 F/ml, the energy density of a symmetric device of a water-based electrolyte is more than 20 Wh/kg, and the volume energy density is more than 15Wh/kg.

Description

technical field [0001] The invention relates to a carbon-based electrode material with an ultrahigh specific capacitance and a composite electrode material thereof, belonging to the technical fields of materials and electrochemistry. Background technique [0002] Supercapacitors have the characteristics of high power density, long cycle life, safety and reliability, and can be widely used in hybrid electric vehicles, high-power output equipment, etc. At present, supercapacitors have formed a very considerable market size in the world, with an output value of 470 million US dollars in 2010, and a growth rate of nearly 20% in recent years. Although the supercapacitor industry has outstanding prospects, it is limited by the low energy density (conventional activated carbon supercapacitor mass specific capacitance <200F / g, volume specific capacitance <200F / mL, energy density <10Wh / kg), which is far lower than lithium batteries ( >100Wh / kg), which makes large-scale a...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/34H01G11/30
CPCY02E60/13
Inventor 黄富强林天全
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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